From mark.fancher at twc.com Sat Dec 13 19:45:40 2014 From: mark.fancher at twc.com (Mark Fancher) Date: Sat, 13 Dec 2014 19:45:40 -0500 Subject: [GPS_Standard] -5 to +5 Voltage Source Message-ID: <000001d01737$4947d970$dbd78c50$@twc.com> I have a 10811-60111 oscillator that I'm using with the GPSDO. I'm having difficulty understanding how to create the proper voltage source for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? Mark, AA4MF From dplatt at radagast.org Sat Dec 13 22:11:15 2014 From: dplatt at radagast.org (Dave Platt) Date: Sat, 13 Dec 2014 19:11:15 -0800 Subject: [GPS_Standard] -5 to +5 Voltage Source In-Reply-To: <000001d01737$4947d970$dbd78c50$@twc.com> References: <000001d01737$4947d970$dbd78c50$@twc.com> Message-ID: <548CFFD3.2090002@radagast.org> > I'm having difficulty understanding how to create the proper voltage source > for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? There are several approaches. If you start with a single-voltage supply (say, a +12 or +24 - whatever your oscillator requires) you can add an additional regulator to get a clean +5 supply for the board's oscillator-control output. Since you only need a small current, a simple 78L05 regulator and a couple of filter caps would be all you need. The -5 is more difficult. The most straightforward way is to use a commercially-made or home-made power supply with both positive and negative outputs... say, a +/- 15 (these are relatively common) and then use a negative voltage regulator such as a 7905 to regulate the -15 down to -5. You could buy a kit such as the Chaney C6895 from Electronics Goldmine... this has three variable output voltages (positive and negative up to 15 volts, at 400 mA, and positive up to 21 volts at 1 ampere). This might be your best bet, if 1 amp is enough to run the oscillator with its heater and the main VE2ZAZ input - the two low-current outputs could be set to +5 and -5 and provided to the VE2ZAZ output circuit. It *is* possible to start with a single-voltage DC supply, and generate positive and negative voltages from it. It's a bit tricky. One approach is to use a switching-type "inverting regulator" to create the negative voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 for two. These switching inverters might not be a great solution for a GPSDO where you want really low noise, though. Another approach is to start with something like a 24-volt DC supply, and use a 7805 linear regulator to create an "artificial ground" (which then becomes the "GND" power input to your VE2ZAZ board). If I were you I'd probably look for a multiple-output DC power supply... Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are all good on-line vendors to check. And... as an out-of-the-box possibility - although your HP oscillator has a -5 to +5 tuning range, there's no law that says you have to actually *use* the whole tuning range. You could have the VE2ZAZ board put out a tuning voltage between 0 and 5 (so no negative supply required) and use the HP oscillator's "FREQ ADJUST" trimmer to rough-tune the oscillator so that it's right about on-frequency when the VE2ZAZ is feeding a mid-scale output (2.5 volts) to the oscillator's EFC input. This would let you get away with just positive power supply voltages to the oscillator oven, oscillator input, and VE2ZAZ. From mark.fancher at twc.com Sun Dec 14 07:35:28 2014 From: mark.fancher at twc.com (Mark Fancher) Date: Sun, 14 Dec 2014 07:35:28 -0500 Subject: [GPS_Standard] -5 to +5 Voltage Source In-Reply-To: <548CFFD3.2090002@radagast.org> References: <000001d01737$4947d970$dbd78c50$@twc.com> <548CFFD3.2090002@radagast.org> Message-ID: <000601d0179a$71a0cb30$54e26190$@twc.com> I guess I should have planned better before I bought the 10811 oscillator. I thought these were very popular for these GPSDO projects, but didn't know there'd be so much difficulty in providing the adjustment voltage to it. What oscillator is best for the VE2ZAZ board that hopefully won't require the complex external negative voltage scheme? Mark -----Original Message----- From: GPS_Standard [mailto:gps_standard-bounces at mailman.qth.net] On Behalf Of Dave Platt Sent: Saturday, December 13, 2014 10:11 PM To: gps_standard at mailman.qth.net Subject: Re: [GPS_Standard] -5 to +5 Voltage Source > I'm having difficulty understanding how to create the proper voltage > source for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? There are several approaches. If you start with a single-voltage supply (say, a +12 or +24 - whatever your oscillator requires) you can add an additional regulator to get a clean +5 supply for the board's oscillator-control output. Since you only need a small current, a simple 78L05 regulator and a couple of filter caps would be all you need. The -5 is more difficult. The most straightforward way is to use a commercially-made or home-made power supply with both positive and negative outputs... say, a +/- 15 (these are relatively common) and then use a negative voltage regulator such as a 7905 to regulate the -15 down to -5. You could buy a kit such as the Chaney C6895 from Electronics Goldmine... this has three variable output voltages (positive and negative up to 15 volts, at 400 mA, and positive up to 21 volts at 1 ampere). This might be your best bet, if 1 amp is enough to run the oscillator with its heater and the main VE2ZAZ input - the two low-current outputs could be set to +5 and -5 and provided to the VE2ZAZ output circuit. It *is* possible to start with a single-voltage DC supply, and generate positive and negative voltages from it. It's a bit tricky. One approach is to use a switching-type "inverting regulator" to create the negative voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 for two. These switching inverters might not be a great solution for a GPSDO where you want really low noise, though. Another approach is to start with something like a 24-volt DC supply, and use a 7805 linear regulator to create an "artificial ground" (which then becomes the "GND" power input to your VE2ZAZ board). If I were you I'd probably look for a multiple-output DC power supply... Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are all good on-line vendors to check. And... as an out-of-the-box possibility - although your HP oscillator has a -5 to +5 tuning range, there's no law that says you have to actually *use* the whole tuning range. You could have the VE2ZAZ board put out a tuning voltage between 0 and 5 (so no negative supply required) and use the HP oscillator's "FREQ ADJUST" trimmer to rough-tune the oscillator so that it's right about on-frequency when the VE2ZAZ is feeding a mid-scale output (2.5 volts) to the oscillator's EFC input. This would let you get away with just positive power supply voltages to the oscillator oven, oscillator input, and VE2ZAZ. ______________________________________________________________ GPS_Standard mailing list Home: http://mailman.qth.net/mailman/listinfo/gps_standard Help: http://mailman.qth.net/mmfaq.htm Post: mailto:GPS_Standard at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html From w0ep at w0ep.us Sun Dec 14 16:21:23 2014 From: w0ep at w0ep.us (w0ep at w0ep.us) Date: Sun, 14 Dec 2014 14:21:23 -0700 Subject: [GPS_Standard] =?utf-8?q?-5_to_+5_Voltage_Source?= Message-ID: <20141214142123.c047917b6272adbdbe8692f8c22b6543.245569ab98.wbe@email09.secureserver.net> From w0ep at w0ep.us Sun Dec 14 16:40:08 2014 From: w0ep at w0ep.us (w0ep at w0ep.us) Date: Sun, 14 Dec 2014 14:40:08 -0700 Subject: [GPS_Standard] =?utf-8?q?-5_to_+5_Voltage_Source?= Message-ID: <20141214144008.c047917b6272adbdbe8692f8c22b6543.22d277e910.wbe@email09.secureserver.net> I forgot, my GPS unit required +3 VDC, so I have a regulator making that also. Chris -------- Original Message -------- Subject: RE: [GPS_Standard] -5 to +5 Voltage Source From: Date: Sun, December 14, 2014 2:21 pm To: "Mark Fancher" , gps_standard at mailman.qth.net I am using that one. It is working well. Besides the VE2ZAZ board, the oscillator requires a heater voltage and an oscillator voltage. So, in my GPSDO I have supplies for +24, +12, +5 and -5. You can run without the +5 if you let the controller board produce that for you. You can run without the -5 if you want to go with the plan Dave described of using half of the control voltage swing. I start with a +24 (spec calls for anywhere between +20 and +30) supply and use regulators to get the +12 and +5. Then I have another supply that produces -5. The manual for that oscillator is available at: http://www.leapsecond.com/museum/10811a/10811a.pdf -------- Original Message -------- Subject: Re: [GPS_Standard] -5 to +5 Voltage Source From: "Mark Fancher" Date: Sun, December 14, 2014 5:35 am To: I guess I should have planned better before I bought the 10811 oscillator. I thought these were very popular for these GPSDO projects, but didn't know there'd be so much difficulty in providing the adjustment voltage to it. What oscillator is best for the VE2ZAZ board that hopefully won't require the complex external negative voltage scheme? Mark -----Original Message----- From: GPS_Standard [mailto:gps_standard-bounces at mailman.qth.net] On Behalf Of Dave Platt Sent: Saturday, December 13, 2014 10:11 PM To: gps_standard at mailman.qth.net Subject: Re: [GPS_Standard] -5 to +5 Voltage Source > I'm having difficulty understanding how to create the proper voltage > source for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? There are several approaches. If you start with a single-voltage supply (say, a +12 or +24 - whatever your oscillator requires) you can add an additional regulator to get a clean +5 supply for the board's oscillator-control output. Since you only need a small current, a simple 78L05 regulator and a couple of filter caps would be all you need. The -5 is more difficult. The most straightforward way is to use a commercially-made or home-made power supply with both positive and negative outputs... say, a +/- 15 (these are relatively common) and then use a negative voltage regulator such as a 7905 to regulate the -15 down to -5. You could buy a kit such as the Chaney C6895 from Electronics Goldmine... this has three variable output voltages (positive and negative up to 15 volts, at 400 mA, and positive up to 21 volts at 1 ampere). This might be your best bet, if 1 amp is enough to run the oscillator with its heater and the main VE2ZAZ input - the two low-current outputs could be set to +5 and -5 and provided to the VE2ZAZ output circuit. It *is* possible to start with a single-voltage DC supply, and generate positive and negative voltages from it. It's a bit tricky. One approach is to use a switching-type "inverting regulator" to create the negative voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 for two. These switching inverters might not be a great solution for a GPSDO where you want really low noise, though. Another approach is to start with something like a 24-volt DC supply, and use a 7805 linear regulator to create an "artificial ground" (which then becomes the "GND" power input to your VE2ZAZ board). If I were you I'd probably look for a multiple-output DC power supply... Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are all good on-line vendors to check. And... as an out-of-the-box possibility - although your HP oscillator has a -5 to +5 tuning range, there's no law that says you have to actually *use* the whole tuning range. You could have the VE2ZAZ board put out a tuning voltage between 0 and 5 (so no negative supply required) and use the HP oscillator's "FREQ ADJUST" trimmer to rough-tune the oscillator so that it's right about on-frequency when the VE2ZAZ is feeding a mid-scale output (2.5 volts) to the oscillator's EFC input. This would let you get away with just positive power supply voltages to the oscillator oven, oscillator input, and VE2ZAZ. ______________________________________________________________ GPS_Standard mailing list Home: http://mailman.qth.net/mailman/listinfo/gps_standard Help: http://mailman.qth.net/mmfaq.htm Post: mailto:GPS_Standard at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ GPS_Standard mailing list Home: http://mailman.qth.net/mailman/listinfo/gps_standard Help: http://mailman.qth.net/mmfaq.htm Post: mailto:GPS_Standard at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html From w9sz.zack at gmail.com Sun Dec 14 22:22:53 2014 From: w9sz.zack at gmail.com (Zack Widup) Date: Sun, 14 Dec 2014 21:22:53 -0600 Subject: [GPS_Standard] -5 to +5 Voltage Source In-Reply-To: <548CFFD3.2090002@radagast.org> References: <000001d01737$4947d970$dbd78c50$@twc.com> <548CFFD3.2090002@radagast.org> Message-ID: The VE2ZAZ design includes a 5 volt positive regulator on the circuit board. To get a negative 5 volts I've used the simple 7660, etc. design that just requires a few capacitors. Positive 5 volts in (brought from the 7805 on the circuit board) produces -5 volts out. The current demand for this circuit is well within the specs of a 7660 or a 7662. I have some other circuits that will supply quite a bit more current at negative 5 volts. I think the TC962 is one device. The LT1072/1172 is another. 73, Zack W9SZ On 12/13/14, Dave Platt wrote: > >> I'm having difficulty understanding how to create the proper voltage >> source >> for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? > > There are several approaches. > > If you start with a single-voltage supply (say, a +12 or +24 - whatever > your oscillator requires) you can add an additional regulator to get a > clean +5 supply for the board's oscillator-control output. Since you > only need a small current, a simple 78L05 regulator and a couple of > filter caps would be all you need. > > The -5 is more difficult. The most straightforward way is to use a > commercially-made or home-made power supply with both positive and > negative outputs... say, a +/- 15 (these are relatively common) and then > use a negative voltage regulator such as a 7905 to regulate the -15 down > to -5. > > You could buy a kit such as the Chaney C6895 from Electronics > Goldmine... this has three variable output voltages (positive and > negative up to 15 volts, at 400 mA, and positive up to 21 volts at 1 > ampere). This might be your best bet, if 1 amp is enough to run the > oscillator with its heater and the main VE2ZAZ input - the two > low-current outputs could be set to +5 and -5 and provided to the VE2ZAZ > output circuit. > > It *is* possible to start with a single-voltage DC supply, and generate > positive and negative voltages from it. It's a bit tricky. One > approach is to use a switching-type "inverting regulator" to create the > negative voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 > for two. These switching inverters might not be a great solution for a > GPSDO where you want really low noise, though. > > Another approach is to start with something like a 24-volt DC supply, > and use a 7805 linear regulator to create an "artificial ground" (which > then becomes the "GND" power input to your VE2ZAZ board). > > If I were you I'd probably look for a multiple-output DC power supply... > Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are > all good on-line vendors to check. > > And... as an out-of-the-box possibility - although your HP oscillator > has a -5 to +5 tuning range, there's no law that says you have to > actually *use* the whole tuning range. You could have the VE2ZAZ board > put out a tuning voltage between 0 and 5 (so no negative supply > required) and use the HP oscillator's "FREQ ADJUST" trimmer to > rough-tune the oscillator so that it's right about on-frequency when the > VE2ZAZ is feeding a mid-scale output (2.5 volts) to the oscillator's > EFC input. > > This would let you get away with just positive power supply voltages to > the oscillator oven, oscillator input, and VE2ZAZ. > > > > ______________________________________________________________ > GPS_Standard mailing list > Home: http://mailman.qth.net/mailman/listinfo/gps_standard > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:GPS_Standard at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > From michal at e2000.gdynia.pl Mon Dec 15 02:43:33 2014 From: michal at e2000.gdynia.pl (SP2IQW) Date: Mon, 15 Dec 2014 08:43:33 +0100 Subject: [GPS_Standard] -5 to +5 Voltage Source In-Reply-To: <548E2558.2040000@e2000.gdynia.pl> References: <548E2558.2040000@e2000.gdynia.pl> Message-ID: <548E9125.7000706@e2000.gdynia.pl> My 3 cents in this topic. If we do not have separate negative power supply the best way is to use a MAX662/LMC662/ICL7662 which makes negative voltage by charge pumping from a positive voltage (4.5-20V range), followed by a 79L05 regulator. We can get -5V also from MAX232 TTL/RS232 converter (unloaded pin 6 provides -10V), it should be filtered and regulated for example with 79L05. Please keep in mind that voltage drop of 79L05 voltage regulator is typically 2V and quiescent current of a regulator is in the range 3-5mA and it may be hard to get enough current from MAX232 when higher current operational amplifier will be used instead of OPA2705. If we don't need negative voltage to control OCXO we can even connect -5V power path to ground. The OPA2705 amplifier works as rail to rail on the input and output what is shown on the original diagram. The known problem is voltage translating between 3,3V CMOS level GPS receiver and 5V logic PIC CPU. This year Texas Instruments introduced SN74LV1T...series logic level translators. http://www.ti.com/lsds/ti/logic/little-logic-little-translation.page?DCMP=hval_sll_log_sn74lv1t_en&HQS=hval-sll-log-sn74lv1t-pp-en Simply insert non-inverting functor as SN74LV1T125/126 or ..08 between low voltage GPS receiver and 5V PIC microcontroller. 73, de Michal sp2iqw W dniu 2014-12-14 o 04:11, Dave Platt pisze: >> I'm having difficulty understanding how to create the proper voltage source >> for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? > There are several approaches. > > If you start with a single-voltage supply (say, a +12 or +24 - whatever > your oscillator requires) you can add an additional regulator to get a > clean +5 supply for the board's oscillator-control output. Since you > only need a small current, a simple 78L05 regulator and a couple of > filter caps would be all you need. > > The -5 is more difficult. The most straightforward way is to use a > commercially-made or home-made power supply with both positive and > negative outputs... say, a +/- 15 (these are relatively common) and then > use a negative voltage regulator such as a 7905 to regulate the -15 down > to -5. > > You could buy a kit such as the Chaney C6895 from Electronics > Goldmine... this has three variable output voltages (positive and > negative up to 15 volts, at 400 mA, and positive up to 21 volts at 1 > ampere). This might be your best bet, if 1 amp is enough to run the > oscillator with its heater and the main VE2ZAZ input - the two > low-current outputs could be set to +5 and -5 and provided to the VE2ZAZ > output circuit. > > It *is* possible to start with a single-voltage DC supply, and generate > positive and negative voltages from it. It's a bit tricky. One > approach is to use a switching-type "inverting regulator" to create the > negative voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 > for two. These switching inverters might not be a great solution for a > GPSDO where you want really low noise, though. > > Another approach is to start with something like a 24-volt DC supply, > and use a 7805 linear regulator to create an "artificial ground" (which > then becomes the "GND" power input to your VE2ZAZ board). > > If I were you I'd probably look for a multiple-output DC power supply... > Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are > all good on-line vendors to check. > > And... as an out-of-the-box possibility - although your HP oscillator > has a -5 to +5 tuning range, there's no law that says you have to > actually *use* the whole tuning range. You could have the VE2ZAZ board > put out a tuning voltage between 0 and 5 (so no negative supply > required) and use the HP oscillator's "FREQ ADJUST" trimmer to > rough-tune the oscillator so that it's right about on-frequency when the > VE2ZAZ is feeding a mid-scale output (2.5 volts) to the oscillator's > EFC input. > > This would let you get away with just positive power supply voltages to > the oscillator oven, oscillator input, and VE2ZAZ. > > > > ______________________________________________________________ > GPS_Standard mailing list > Home:http://mailman.qth.net/mailman/listinfo/gps_standard > Help:http://mailman.qth.net/mmfaq.htm > Post:mailto:GPS_Standard at mailman.qth.net > > This list hosted by:http://www.qsl.net > Please help support this email list:http://www.qsl.net/donate.html > From ww2r2 at g4fre.com Mon Dec 15 05:52:42 2014 From: ww2r2 at g4fre.com (Dave) Date: Mon, 15 Dec 2014 10:52:42 -0000 Subject: [GPS_Standard] -5 to +5 Voltage Source In-Reply-To: References: <000001d01737$4947d970$dbd78c50$@twc.com> <548CFFD3.2090002@radagast.org> Message-ID: <001201d01855$41155bf0$c34013d0$@com> I used the LT1054 on mine. It has the advantage of being able to take up to 15V input and give a regulated -5V output at up to 100mA It doesn't suffer the internal series resistance issues of the 7660 where the output drops with load. An example of my using it is at http://g4fre.com/10gpa.htm Dave G4fre -----Original Message----- From: GPS_Standard [mailto:gps_standard-bounces at mailman.qth.net] On Behalf Of Zack Widup Sent: 15 December 2014 03:23 To: gps_standard Subject: Re: [GPS_Standard] -5 to +5 Voltage Source The VE2ZAZ design includes a 5 volt positive regulator on the circuit board. To get a negative 5 volts I've used the simple 7660, etc. design that just requires a few capacitors. Positive 5 volts in (brought from the 7805 on the circuit board) produces -5 volts out. The current demand for this circuit is well within the specs of a 7660 or a 7662. I have some other circuits that will supply quite a bit more current at negative 5 volts. I think the TC962 is one device. The LT1072/1172 is another. 73, Zack W9SZ On 12/13/14, Dave Platt wrote: > >> I'm having difficulty understanding how to create the proper voltage >> source >> for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? > > There are several approaches. > > If you start with a single-voltage supply (say, a +12 or +24 - whatever > your oscillator requires) you can add an additional regulator to get a > clean +5 supply for the board's oscillator-control output. Since you > only need a small current, a simple 78L05 regulator and a couple of > filter caps would be all you need. > > The -5 is more difficult. The most straightforward way is to use a > commercially-made or home-made power supply with both positive and > negative outputs... say, a +/- 15 (these are relatively common) and then > use a negative voltage regulator such as a 7905 to regulate the -15 down > to -5. > > You could buy a kit such as the Chaney C6895 from Electronics > Goldmine... this has three variable output voltages (positive and > negative up to 15 volts, at 400 mA, and positive up to 21 volts at 1 > ampere). This might be your best bet, if 1 amp is enough to run the > oscillator with its heater and the main VE2ZAZ input - the two > low-current outputs could be set to +5 and -5 and provided to the VE2ZAZ > output circuit. > > It *is* possible to start with a single-voltage DC supply, and generate > positive and negative voltages from it. It's a bit tricky. One > approach is to use a switching-type "inverting regulator" to create the > negative voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 > for two. These switching inverters might not be a great solution for a > GPSDO where you want really low noise, though. > > Another approach is to start with something like a 24-volt DC supply, > and use a 7805 linear regulator to create an "artificial ground" (which > then becomes the "GND" power input to your VE2ZAZ board). > > If I were you I'd probably look for a multiple-output DC power supply... > Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are > all good on-line vendors to check. > > And... as an out-of-the-box possibility - although your HP oscillator > has a -5 to +5 tuning range, there's no law that says you have to > actually *use* the whole tuning range. You could have the VE2ZAZ board > put out a tuning voltage between 0 and 5 (so no negative supply > required) and use the HP oscillator's "FREQ ADJUST" trimmer to > rough-tune the oscillator so that it's right about on-frequency when the > VE2ZAZ is feeding a mid-scale output (2.5 volts) to the oscillator's > EFC input. > > This would let you get away with just positive power supply voltages to > the oscillator oven, oscillator input, and VE2ZAZ. > > > > ______________________________________________________________ > GPS_Standard mailing list > Home: http://mailman.qth.net/mailman/listinfo/gps_standard > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:GPS_Standard at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ GPS_Standard mailing list Home: http://mailman.qth.net/mailman/listinfo/gps_standard Help: http://mailman.qth.net/mmfaq.htm Post: mailto:GPS_Standard at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html From jg1kgs at gmail.com Wed Dec 17 18:48:35 2014 From: jg1kgs at gmail.com (Jim D) Date: Thu, 18 Dec 2014 08:48:35 +0900 Subject: [GPS_Standard] GPS_Standard Digest, Vol 69, Issue 2 In-Reply-To: References: Message-ID: I use a Morion MV89A OCXO with my GPSDO. Available on eBay for good prices and only requires 12v and +5v. They are a very stable double oven oscillator. Jim JG1KGS On 12/15/14, gps_standard-request at mailman.qth.net wrote: > Send GPS_Standard mailing list submissions to > gps_standard at mailman.qth.net > > To subscribe or unsubscribe via the World Wide Web, visit > http://mailman.qth.net/mailman/listinfo/gps_standard > or, via email, send a message with subject or body 'help' to > gps_standard-request at mailman.qth.net > > You can reach the person managing the list at > gps_standard-owner at mailman.qth.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of GPS_Standard digest..." > > > Today's Topics: > > 1. Re: -5 to +5 Voltage Source (Mark Fancher) > 2. Re: -5 to +5 Voltage Source (w0ep at w0ep.us) > 3. Re: -5 to +5 Voltage Source (w0ep at w0ep.us) > 4. Re: -5 to +5 Voltage Source (Zack Widup) > 5. Re: -5 to +5 Voltage Source (SP2IQW) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 14 Dec 2014 07:35:28 -0500 > From: "Mark Fancher" > To: > Subject: Re: [GPS_Standard] -5 to +5 Voltage Source > Message-ID: <000601d0179a$71a0cb30$54e26190$@twc.com> > Content-Type: text/plain; charset="us-ascii" > > I guess I should have planned better before I bought the 10811 oscillator. > I thought these were very popular for these GPSDO projects, but didn't know > there'd be so much difficulty in providing the adjustment voltage to it. > > What oscillator is best for the VE2ZAZ board that hopefully won't require > the complex external negative voltage scheme? > > Mark > > -----Original Message----- > From: GPS_Standard [mailto:gps_standard-bounces at mailman.qth.net] On Behalf > Of Dave Platt > Sent: Saturday, December 13, 2014 10:11 PM > To: gps_standard at mailman.qth.net > Subject: Re: [GPS_Standard] -5 to +5 Voltage Source > > >> I'm having difficulty understanding how to create the proper voltage >> source for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? > > There are several approaches. > > If you start with a single-voltage supply (say, a +12 or +24 - whatever > your > oscillator requires) you can add an additional regulator to get a clean +5 > supply for the board's oscillator-control output. Since you only need a > small current, a simple 78L05 regulator and a couple of filter caps would > be > all you need. > > The -5 is more difficult. The most straightforward way is to use a > commercially-made or home-made power supply with both positive and negative > outputs... say, a +/- 15 (these are relatively common) and then use a > negative voltage regulator such as a 7905 to regulate the -15 down to -5. > > You could buy a kit such as the Chaney C6895 from Electronics Goldmine... > this has three variable output voltages (positive and negative up to 15 > volts, at 400 mA, and positive up to 21 volts at 1 ampere). This might be > your best bet, if 1 amp is enough to run the oscillator with its heater and > the main VE2ZAZ input - the two low-current outputs could be set to +5 and > -5 and provided to the VE2ZAZ output circuit. > > It *is* possible to start with a single-voltage DC supply, and generate > positive and negative voltages from it. It's a bit tricky. One approach > is > to use a switching-type "inverting regulator" to create the negative > voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 for two. > These > switching inverters might not be a great solution for a GPSDO where you > want > really low noise, though. > > Another approach is to start with something like a 24-volt DC supply, and > use a 7805 linear regulator to create an "artificial ground" (which then > becomes the "GND" power input to your VE2ZAZ board). > > If I were you I'd probably look for a multiple-output DC power supply... > Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are all > good on-line vendors to check. > > And... as an out-of-the-box possibility - although your HP oscillator has a > -5 to +5 tuning range, there's no law that says you have to actually *use* > the whole tuning range. You could have the VE2ZAZ board put out a tuning > voltage between 0 and 5 (so no negative supply > required) and use the HP oscillator's "FREQ ADJUST" trimmer to rough-tune > the oscillator so that it's right about on-frequency when the VE2ZAZ is > feeding a mid-scale output (2.5 volts) to the oscillator's EFC input. > > This would let you get away with just positive power supply voltages to the > oscillator oven, oscillator input, and VE2ZAZ. > > > > ______________________________________________________________ > GPS_Standard mailing list > Home: http://mailman.qth.net/mailman/listinfo/gps_standard > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:GPS_Standard at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > > ------------------------------ > > Message: 2 > Date: Sun, 14 Dec 2014 14:21:23 -0700 > From: > To: "Mark Fancher" , > gps_standard at mailman.qth.net > Subject: Re: [GPS_Standard] -5 to +5 Voltage Source > Message-ID: > <20141214142123.c047917b6272adbdbe8692f8c22b6543.245569ab98.wbe at email09.secureserver.net> > > Content-Type: text/plain; charset="utf-8" > > > > ------------------------------ > > Message: 3 > Date: Sun, 14 Dec 2014 14:40:08 -0700 > From: > To: "Mark Fancher" , > gps_standard at mailman.qth.net > Subject: Re: [GPS_Standard] -5 to +5 Voltage Source > Message-ID: > <20141214144008.c047917b6272adbdbe8692f8c22b6543.22d277e910.wbe at email09.secureserver.net> > > Content-Type: text/plain; charset="utf-8" > > > I forgot, my GPS unit required +3 VDC, so I have > a regulator making that also. > > > > Chris > > -------- Original Message -------- > Subject: RE: [GPS_Standard] -5 to +5 Voltage Source > From: > Date: Sun, December 14, 2014 2:21 pm > To: "Mark Fancher" , gps_standard at mailman.qth.net > > > > I am using that one. It is working well. > > > > Besides the VE2ZAZ board, the oscillator requires a heater > voltage and an oscillator voltage. > > > So, in my GPSDO I have supplies for +24, +12, +5 and -5. > You can run without the +5 if you let the controller board > produce that for you. You can run without the -5 if > you want to go with the plan Dave described of using > half of the control voltage swing. > > > I start with a +24 (spec calls for anywhere between +20 and +30) > supply and use regulators to get the +12 and +5. > Then I have another supply that produces -5. > > > The manual for that oscillator is available at: > > > http://www.leapsecond.com/museum/10811a/10811a.pdf > > > > > > > > > > -------- Original Message -------- > Subject: Re: [GPS_Standard] -5 to +5 Voltage Source > From: "Mark Fancher" > Date: Sun, December 14, 2014 5:35 am > To: > > I guess I should have planned better before I bought the 10811 > oscillator. > I thought these were very popular for these GPSDO projects, but didn't > know > there'd be so much difficulty in providing the adjustment voltage to > it. > > What oscillator is best for the VE2ZAZ board that hopefully won't > require > the complex external negative voltage scheme? > > Mark > > -----Original Message----- > From: GPS_Standard [mailto:gps_standard-bounces at mailman.qth.net] On > Behalf > Of Dave Platt > Sent: Saturday, December 13, 2014 10:11 PM > To: gps_standard at mailman.qth.net > Subject: Re: [GPS_Standard] -5 to +5 Voltage Source > > > > I'm having difficulty understanding how to create the proper voltage > > source for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? > > There are several approaches. > > If you start with a single-voltage supply (say, a +12 or +24 - whatever > your > oscillator requires) you can add an additional regulator to get a clean > +5 > supply for the board's oscillator-control output. Since you only need a > small current, a simple 78L05 regulator and a couple of filter caps > would be > all you need. > > The -5 is more difficult. The most straightforward way is to use a > commercially-made or home-made power supply with both positive and > negative > outputs... say, a +/- 15 (these are relatively common) and then use a > negative voltage regulator such as a 7905 to regulate the -15 down to > -5. > > You could buy a kit such as the Chaney C6895 from Electronics > Goldmine... > this has three variable output voltages (positive and negative up to 15 > volts, at 400 mA, and positive up to 21 volts at 1 ampere). This might > be > your best bet, if 1 amp is enough to run the oscillator with its heater > and > the main VE2ZAZ input - the two low-current outputs could be set to +5 > and > -5 and provided to the VE2ZAZ output circuit. > > It *is* possible to start with a single-voltage DC supply, and generate > positive and negative voltages from it. It's a bit tricky. One approach > is > to use a switching-type "inverting regulator" to create the negative > voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 for two. > These > switching inverters might not be a great solution for a GPSDO where you > want > really low noise, though. > > Another approach is to start with something like a 24-volt DC supply, > and > use a 7805 linear regulator to create an "artificial ground" (which > then > becomes the "GND" power input to your VE2ZAZ board). > > If I were you I'd probably look for a multiple-output DC power > supply... > Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are > all > good on-line vendors to check. > > And... as an out-of-the-box possibility - although your HP oscillator > has a > -5 to +5 tuning range, there's no law that says you have to actually > *use* > the whole tuning range. You could have the VE2ZAZ board put out a > tuning > voltage between 0 and 5 (so no negative supply > required) and use the HP oscillator's "FREQ ADJUST" trimmer to > rough-tune > the oscillator so that it's right about on-frequency when the VE2ZAZ is > feeding a mid-scale output (2.5 volts) to the oscillator's EFC input. > > This would let you get away with just positive power supply voltages to > the > oscillator oven, oscillator input, and VE2ZAZ. > > > > ______________________________________________________________ > GPS_Standard mailing list > Home: http://mailman.qth.net/mailman/listinfo/gps_standard > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:GPS_Standard at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ > GPS_Standard mailing list > Home: http://mailman.qth.net/mailman/listinfo/gps_standard > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:GPS_Standard at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > ------------------------------ > > Message: 4 > Date: Sun, 14 Dec 2014 21:22:53 -0600 > From: Zack Widup > To: gps_standard > Subject: Re: [GPS_Standard] -5 to +5 Voltage Source > Message-ID: > > Content-Type: text/plain; charset=UTF-8 > > The VE2ZAZ design includes a 5 volt positive regulator on the circuit > board. > > To get a negative 5 volts I've used the simple 7660, etc. design that > just requires a few capacitors. Positive 5 volts in (brought from the > 7805 on the circuit board) produces -5 volts out. The current demand > for this circuit is well within the specs of a 7660 or a 7662. I have > some other circuits that will supply quite a bit more current at > negative 5 volts. I think the TC962 is one device. The LT1072/1172 is > another. > > 73, Zack W9SZ > > > On 12/13/14, Dave Platt wrote: >> >>> I'm having difficulty understanding how to create the proper voltage >>> source >>> for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? >> >> There are several approaches. >> >> If you start with a single-voltage supply (say, a +12 or +24 - whatever >> your oscillator requires) you can add an additional regulator to get a >> clean +5 supply for the board's oscillator-control output. Since you >> only need a small current, a simple 78L05 regulator and a couple of >> filter caps would be all you need. >> >> The -5 is more difficult. The most straightforward way is to use a >> commercially-made or home-made power supply with both positive and >> negative outputs... say, a +/- 15 (these are relatively common) and then >> use a negative voltage regulator such as a 7905 to regulate the -15 down >> to -5. >> >> You could buy a kit such as the Chaney C6895 from Electronics >> Goldmine... this has three variable output voltages (positive and >> negative up to 15 volts, at 400 mA, and positive up to 21 volts at 1 >> ampere). This might be your best bet, if 1 amp is enough to run the >> oscillator with its heater and the main VE2ZAZ input - the two >> low-current outputs could be set to +5 and -5 and provided to the VE2ZAZ >> output circuit. >> >> It *is* possible to start with a single-voltage DC supply, and generate >> positive and negative voltages from it. It's a bit tricky. One >> approach is to use a switching-type "inverting regulator" to create the >> negative voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 >> for two. These switching inverters might not be a great solution for a >> GPSDO where you want really low noise, though. >> >> Another approach is to start with something like a 24-volt DC supply, >> and use a 7805 linear regulator to create an "artificial ground" (which >> then becomes the "GND" power input to your VE2ZAZ board). >> >> If I were you I'd probably look for a multiple-output DC power supply... >> Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are >> all good on-line vendors to check. >> >> And... as an out-of-the-box possibility - although your HP oscillator >> has a -5 to +5 tuning range, there's no law that says you have to >> actually *use* the whole tuning range. You could have the VE2ZAZ board >> put out a tuning voltage between 0 and 5 (so no negative supply >> required) and use the HP oscillator's "FREQ ADJUST" trimmer to >> rough-tune the oscillator so that it's right about on-frequency when the >> VE2ZAZ is feeding a mid-scale output (2.5 volts) to the oscillator's >> EFC input. >> >> This would let you get away with just positive power supply voltages to >> the oscillator oven, oscillator input, and VE2ZAZ. >> >> >> >> ______________________________________________________________ >> GPS_Standard mailing list >> Home: http://mailman.qth.net/mailman/listinfo/gps_standard >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:GPS_Standard at mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> > > > ------------------------------ > > Message: 5 > Date: Mon, 15 Dec 2014 08:43:33 +0100 > From: SP2IQW > To: gps_standard at mailman.qth.net > Subject: Re: [GPS_Standard] -5 to +5 Voltage Source > Message-ID: <548E9125.7000706 at e2000.gdynia.pl> > Content-Type: text/plain; charset=windows-1252; format=flowed > > My 3 cents in this topic. > > If we do not have separate negative power supply the best way is to use > a MAX662/LMC662/ICL7662 which makes negative voltage by charge pumping > from a positive voltage (4.5-20V range), followed by a 79L05 regulator. > We can get -5V also from MAX232 TTL/RS232 converter (unloaded pin 6 > provides -10V), it should be filtered and regulated for example with 79L05. > > Please keep in mind that voltage drop of 79L05 voltage regulator is > typically 2V and quiescent current of a regulator is in the range 3-5mA > and it may be hard to get enough current from MAX232 when higher current > operational amplifier will be used instead of OPA2705. > > If we don't need negative voltage to control OCXO we can even connect > -5V power path to ground. The OPA2705 amplifier works as rail to rail on > the input and output what is shown on the original diagram. > > > The known problem is voltage translating between 3,3V CMOS level GPS > receiver and 5V logic PIC CPU. > This year Texas Instruments introduced SN74LV1T...series logic level > translators. > http://www.ti.com/lsds/ti/logic/little-logic-little-translation.page?DCMP=hval_sll_log_sn74lv1t_en&HQS=hval-sll-log-sn74lv1t-pp-en > Simply insert non-inverting functor as SN74LV1T125/126 or ..08 between > low voltage GPS receiver and 5V PIC microcontroller. > > 73, de Michal > sp2iqw > > > > W dniu 2014-12-14 o 04:11, Dave Platt pisze: >>> I'm having difficulty understanding how to create the proper voltage >>> source >>> for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? >> There are several approaches. >> >> If you start with a single-voltage supply (say, a +12 or +24 - whatever >> your oscillator requires) you can add an additional regulator to get a >> clean +5 supply for the board's oscillator-control output. Since you >> only need a small current, a simple 78L05 regulator and a couple of >> filter caps would be all you need. >> >> The -5 is more difficult. The most straightforward way is to use a >> commercially-made or home-made power supply with both positive and >> negative outputs... say, a +/- 15 (these are relatively common) and then >> use a negative voltage regulator such as a 7905 to regulate the -15 down >> to -5. >> >> You could buy a kit such as the Chaney C6895 from Electronics >> Goldmine... this has three variable output voltages (positive and >> negative up to 15 volts, at 400 mA, and positive up to 21 volts at 1 >> ampere). This might be your best bet, if 1 amp is enough to run the >> oscillator with its heater and the main VE2ZAZ input - the two >> low-current outputs could be set to +5 and -5 and provided to the VE2ZAZ >> output circuit. >> >> It *is* possible to start with a single-voltage DC supply, and generate >> positive and negative voltages from it. It's a bit tricky. One >> approach is to use a switching-type "inverting regulator" to create the >> negative voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 >> for two. These switching inverters might not be a great solution for a >> GPSDO where you want really low noise, though. >> >> Another approach is to start with something like a 24-volt DC supply, >> and use a 7805 linear regulator to create an "artificial ground" (which >> then becomes the "GND" power input to your VE2ZAZ board). >> >> If I were you I'd probably look for a multiple-output DC power supply... >> Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are >> all good on-line vendors to check. >> >> And... as an out-of-the-box possibility - although your HP oscillator >> has a -5 to +5 tuning range, there's no law that says you have to >> actually *use* the whole tuning range. You could have the VE2ZAZ board >> put out a tuning voltage between 0 and 5 (so no negative supply >> required) and use the HP oscillator's "FREQ ADJUST" trimmer to >> rough-tune the oscillator so that it's right about on-frequency when the >> VE2ZAZ is feeding a mid-scale output (2.5 volts) to the oscillator's >> EFC input. >> >> This would let you get away with just positive power supply voltages to >> the oscillator oven, oscillator input, and VE2ZAZ. >> >> >> >> ______________________________________________________________ >> GPS_Standard mailing list >> Home:http://mailman.qth.net/mailman/listinfo/gps_standard >> Help:http://mailman.qth.net/mmfaq.htm >> Post:mailto:GPS_Standard at mailman.qth.net >> >> This list hosted by:http://www.qsl.net >> Please help support this email list:http://www.qsl.net/donate.html >> > > > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > GPS_Standard mailing list > GPS_Standard at mailman.qth.net > http://mailman.qth.net/mailman/listinfo/gps_standard > > > ------------------------------ > > End of GPS_Standard Digest, Vol 69, Issue 2 > ******************************************* > From vk6jy at iinet.net.au Wed Dec 17 20:02:59 2014 From: vk6jy at iinet.net.au (John-Y) Date: Thu, 18 Dec 2014 09:02:59 +0800 Subject: [GPS_Standard] GPS_Standard Digest, Vol 69, Issue 2 In-Reply-To: References: Message-ID: <549227C3.6040709@iinet.net.au> On 18/12/2014 7:48 AM, Jim D wrote: > I use a Morion MV89A OCXO with my GPSDO. Available on eBay for good > prices and only requires 12v and +5v. They are a very stable double > oven oscillator. > > Jim > JG1KGS > > > On 12/15/14, gps_standard-request at mailman.qth.net > wrote: >> Send GPS_Standard mailing list submissions to >> gps_standard at mailman.qth.net >> >> To subscribe or unsubscribe via the World Wide Web, visit >> http://mailman.qth.net/mailman/listinfo/gps_standard >> or, via email, send a message with subject or body 'help' to >> gps_standard-request at mailman.qth.net >> >> You can reach the person managing the list at >> gps_standard-owner at mailman.qth.net >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of GPS_Standard digest..." >> >> >> Today's Topics: >> >> 1. Re: -5 to +5 Voltage Source (Mark Fancher) >> 2. Re: -5 to +5 Voltage Source (w0ep at w0ep.us) >> 3. Re: -5 to +5 Voltage Source (w0ep at w0ep.us) >> 4. Re: -5 to +5 Voltage Source (Zack Widup) >> 5. Re: -5 to +5 Voltage Source (SP2IQW) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Sun, 14 Dec 2014 07:35:28 -0500 >> From: "Mark Fancher" >> To: >> Subject: Re: [GPS_Standard] -5 to +5 Voltage Source >> Message-ID: <000601d0179a$71a0cb30$54e26190$@twc.com> >> Content-Type: text/plain; charset="us-ascii" >> >> I guess I should have planned better before I bought the 10811 oscillator. >> I thought these were very popular for these GPSDO projects, but didn't know >> there'd be so much difficulty in providing the adjustment voltage to it. >> >> What oscillator is best for the VE2ZAZ board that hopefully won't require >> the complex external negative voltage scheme? >> >> Mark >> >> -----Original Message----- >> From: GPS_Standard [mailto:gps_standard-bounces at mailman.qth.net] On Behalf >> Of Dave Platt >> Sent: Saturday, December 13, 2014 10:11 PM >> To: gps_standard at mailman.qth.net >> Subject: Re: [GPS_Standard] -5 to +5 Voltage Source >> >> >>> I'm having difficulty understanding how to create the proper voltage >>> source for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? >> There are several approaches. >> >> If you start with a single-voltage supply (say, a +12 or +24 - whatever >> your >> oscillator requires) you can add an additional regulator to get a clean +5 >> supply for the board's oscillator-control output. Since you only need a >> small current, a simple 78L05 regulator and a couple of filter caps would >> be >> all you need. >> >> The -5 is more difficult. The most straightforward way is to use a >> commercially-made or home-made power supply with both positive and negative >> outputs... say, a +/- 15 (these are relatively common) and then use a >> negative voltage regulator such as a 7905 to regulate the -15 down to -5. >> >> You could buy a kit such as the Chaney C6895 from Electronics Goldmine... >> this has three variable output voltages (positive and negative up to 15 >> volts, at 400 mA, and positive up to 21 volts at 1 ampere). This might be >> your best bet, if 1 amp is enough to run the oscillator with its heater and >> the main VE2ZAZ input - the two low-current outputs could be set to +5 and >> -5 and provided to the VE2ZAZ output circuit. >> >> It *is* possible to start with a single-voltage DC supply, and generate >> positive and negative voltages from it. It's a bit tricky. One approach >> is >> to use a switching-type "inverting regulator" to create the negative >> voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 for two. >> These >> switching inverters might not be a great solution for a GPSDO where you >> want >> really low noise, though. >> >> Another approach is to start with something like a 24-volt DC supply, and >> use a 7805 linear regulator to create an "artificial ground" (which then >> becomes the "GND" power input to your VE2ZAZ board). >> >> If I were you I'd probably look for a multiple-output DC power supply... >> Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are all >> good on-line vendors to check. >> >> And... as an out-of-the-box possibility - although your HP oscillator has a >> -5 to +5 tuning range, there's no law that says you have to actually *use* >> the whole tuning range. You could have the VE2ZAZ board put out a tuning >> voltage between 0 and 5 (so no negative supply >> required) and use the HP oscillator's "FREQ ADJUST" trimmer to rough-tune >> the oscillator so that it's right about on-frequency when the VE2ZAZ is >> feeding a mid-scale output (2.5 volts) to the oscillator's EFC input. >> >> This would let you get away with just positive power supply voltages to the >> oscillator oven, oscillator input, and VE2ZAZ. >> >> >> >> ______________________________________________________________ >> GPS_Standard mailing list >> Home: http://mailman.qth.net/mailman/listinfo/gps_standard >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:GPS_Standard at mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> >> >> ------------------------------ >> >> Message: 2 >> Date: Sun, 14 Dec 2014 14:21:23 -0700 >> From: >> To: "Mark Fancher" , >> gps_standard at mailman.qth.net >> Subject: Re: [GPS_Standard] -5 to +5 Voltage Source >> Message-ID: >> <20141214142123.c047917b6272adbdbe8692f8c22b6543.245569ab98.wbe at email09.secureserver.net> >> >> Content-Type: text/plain; charset="utf-8" >> >> >> >> ------------------------------ >> >> Message: 3 >> Date: Sun, 14 Dec 2014 14:40:08 -0700 >> From: >> To: "Mark Fancher" , >> gps_standard at mailman.qth.net >> Subject: Re: [GPS_Standard] -5 to +5 Voltage Source >> Message-ID: >> <20141214144008.c047917b6272adbdbe8692f8c22b6543.22d277e910.wbe at email09.secureserver.net> >> >> Content-Type: text/plain; charset="utf-8" >> >> >> I forgot, my GPS unit required +3 VDC, so I have >> a regulator making that also. >> >> >> >> Chris >> >> -------- Original Message -------- >> Subject: RE: [GPS_Standard] -5 to +5 Voltage Source >> From: >> Date: Sun, December 14, 2014 2:21 pm >> To: "Mark Fancher" , gps_standard at mailman.qth.net >> >> >> >> I am using that one. It is working well. >> >> >> >> Besides the VE2ZAZ board, the oscillator requires a heater >> voltage and an oscillator voltage. >> >> >> So, in my GPSDO I have supplies for +24, +12, +5 and -5. >> You can run without the +5 if you let the controller board >> produce that for you. You can run without the -5 if >> you want to go with the plan Dave described of using >> half of the control voltage swing. >> >> >> I start with a +24 (spec calls for anywhere between +20 and +30) >> supply and use regulators to get the +12 and +5. >> Then I have another supply that produces -5. >> >> >> The manual for that oscillator is available at: >> >> >> http://www.leapsecond.com/museum/10811a/10811a.pdf >> >> >> >> >> >> >> >> >> >> -------- Original Message -------- >> Subject: Re: [GPS_Standard] -5 to +5 Voltage Source >> From: "Mark Fancher" >> Date: Sun, December 14, 2014 5:35 am >> To: >> >> I guess I should have planned better before I bought the 10811 >> oscillator. >> I thought these were very popular for these GPSDO projects, but didn't >> know >> there'd be so much difficulty in providing the adjustment voltage to >> it. >> >> What oscillator is best for the VE2ZAZ board that hopefully won't >> require >> the complex external negative voltage scheme? >> >> Mark >> >> -----Original Message----- >> From: GPS_Standard [mailto:gps_standard-bounces at mailman.qth.net] On >> Behalf >> Of Dave Platt >> Sent: Saturday, December 13, 2014 10:11 PM >> To: gps_standard at mailman.qth.net >> Subject: Re: [GPS_Standard] -5 to +5 Voltage Source >> >> >> > I'm having difficulty understanding how to create the proper voltage >> > source for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? >> >> There are several approaches. >> >> If you start with a single-voltage supply (say, a +12 or +24 - whatever >> your >> oscillator requires) you can add an additional regulator to get a clean >> +5 >> supply for the board's oscillator-control output. Since you only need a >> small current, a simple 78L05 regulator and a couple of filter caps >> would be >> all you need. >> >> The -5 is more difficult. The most straightforward way is to use a >> commercially-made or home-made power supply with both positive and >> negative >> outputs... say, a +/- 15 (these are relatively common) and then use a >> negative voltage regulator such as a 7905 to regulate the -15 down to >> -5. >> >> You could buy a kit such as the Chaney C6895 from Electronics >> Goldmine... >> this has three variable output voltages (positive and negative up to 15 >> volts, at 400 mA, and positive up to 21 volts at 1 ampere). This might >> be >> your best bet, if 1 amp is enough to run the oscillator with its heater >> and >> the main VE2ZAZ input - the two low-current outputs could be set to +5 >> and >> -5 and provided to the VE2ZAZ output circuit. >> >> It *is* possible to start with a single-voltage DC supply, and generate >> positive and negative voltages from it. It's a bit tricky. One approach >> is >> to use a switching-type "inverting regulator" to create the negative >> voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 for two. >> These >> switching inverters might not be a great solution for a GPSDO where you >> want >> really low noise, though. >> >> Another approach is to start with something like a 24-volt DC supply, >> and >> use a 7805 linear regulator to create an "artificial ground" (which >> then >> becomes the "GND" power input to your VE2ZAZ board). >> >> If I were you I'd probably look for a multiple-output DC power >> supply... >> Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are >> all >> good on-line vendors to check. >> >> And... as an out-of-the-box possibility - although your HP oscillator >> has a >> -5 to +5 tuning range, there's no law that says you have to actually >> *use* >> the whole tuning range. You could have the VE2ZAZ board put out a >> tuning >> voltage between 0 and 5 (so no negative supply >> required) and use the HP oscillator's "FREQ ADJUST" trimmer to >> rough-tune >> the oscillator so that it's right about on-frequency when the VE2ZAZ is >> feeding a mid-scale output (2.5 volts) to the oscillator's EFC input. >> >> This would let you get away with just positive power supply voltages to >> the >> oscillator oven, oscillator input, and VE2ZAZ. >> >> >> >> ______________________________________________________________ >> GPS_Standard mailing list >> Home: http://mailman.qth.net/mailman/listinfo/gps_standard >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:GPS_Standard at mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> ______________________________________________________________ >> GPS_Standard mailing list >> Home: http://mailman.qth.net/mailman/listinfo/gps_standard >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:GPS_Standard at mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> >> ------------------------------ >> >> Message: 4 >> Date: Sun, 14 Dec 2014 21:22:53 -0600 >> From: Zack Widup >> To: gps_standard >> Subject: Re: [GPS_Standard] -5 to +5 Voltage Source >> Message-ID: >> >> Content-Type: text/plain; charset=UTF-8 >> >> The VE2ZAZ design includes a 5 volt positive regulator on the circuit >> board. >> >> To get a negative 5 volts I've used the simple 7660, etc. design that >> just requires a few capacitors. Positive 5 volts in (brought from the >> 7805 on the circuit board) produces -5 volts out. The current demand >> for this circuit is well within the specs of a 7660 or a 7662. I have >> some other circuits that will supply quite a bit more current at >> negative 5 volts. I think the TC962 is one device. The LT1072/1172 is >> another. >> >> 73, Zack W9SZ >> >> >> On 12/13/14, Dave Platt wrote: >>>> I'm having difficulty understanding how to create the proper voltage >>>> source >>>> for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? >>> There are several approaches. >>> >>> If you start with a single-voltage supply (say, a +12 or +24 - whatever >>> your oscillator requires) you can add an additional regulator to get a >>> clean +5 supply for the board's oscillator-control output. Since you >>> only need a small current, a simple 78L05 regulator and a couple of >>> filter caps would be all you need. >>> >>> The -5 is more difficult. The most straightforward way is to use a >>> commercially-made or home-made power supply with both positive and >>> negative outputs... say, a +/- 15 (these are relatively common) and then >>> use a negative voltage regulator such as a 7905 to regulate the -15 down >>> to -5. >>> >>> You could buy a kit such as the Chaney C6895 from Electronics >>> Goldmine... this has three variable output voltages (positive and >>> negative up to 15 volts, at 400 mA, and positive up to 21 volts at 1 >>> ampere). This might be your best bet, if 1 amp is enough to run the >>> oscillator with its heater and the main VE2ZAZ input - the two >>> low-current outputs could be set to +5 and -5 and provided to the VE2ZAZ >>> output circuit. >>> >>> It *is* possible to start with a single-voltage DC supply, and generate >>> positive and negative voltages from it. It's a bit tricky. One >>> approach is to use a switching-type "inverting regulator" to create the >>> negative voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 >>> for two. These switching inverters might not be a great solution for a >>> GPSDO where you want really low noise, though. >>> >>> Another approach is to start with something like a 24-volt DC supply, >>> and use a 7805 linear regulator to create an "artificial ground" (which >>> then becomes the "GND" power input to your VE2ZAZ board). >>> >>> If I were you I'd probably look for a multiple-output DC power supply... >>> Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are >>> all good on-line vendors to check. >>> >>> And... as an out-of-the-box possibility - although your HP oscillator >>> has a -5 to +5 tuning range, there's no law that says you have to >>> actually *use* the whole tuning range. You could have the VE2ZAZ board >>> put out a tuning voltage between 0 and 5 (so no negative supply >>> required) and use the HP oscillator's "FREQ ADJUST" trimmer to >>> rough-tune the oscillator so that it's right about on-frequency when the >>> VE2ZAZ is feeding a mid-scale output (2.5 volts) to the oscillator's >>> EFC input. >>> >>> This would let you get away with just positive power supply voltages to >>> the oscillator oven, oscillator input, and VE2ZAZ. >>> >>> >>> >>> ______________________________________________________________ >>> GPS_Standard mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/gps_standard >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:GPS_Standard at mailman.qth.net >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> >> >> ------------------------------ >> >> Message: 5 >> Date: Mon, 15 Dec 2014 08:43:33 +0100 >> From: SP2IQW >> To: gps_standard at mailman.qth.net >> Subject: Re: [GPS_Standard] -5 to +5 Voltage Source >> Message-ID: <548E9125.7000706 at e2000.gdynia.pl> >> Content-Type: text/plain; charset=windows-1252; format=flowed >> >> My 3 cents in this topic. >> >> If we do not have separate negative power supply the best way is to use >> a MAX662/LMC662/ICL7662 which makes negative voltage by charge pumping >> from a positive voltage (4.5-20V range), followed by a 79L05 regulator. >> We can get -5V also from MAX232 TTL/RS232 converter (unloaded pin 6 >> provides -10V), it should be filtered and regulated for example with 79L05. >> >> Please keep in mind that voltage drop of 79L05 voltage regulator is >> typically 2V and quiescent current of a regulator is in the range 3-5mA >> and it may be hard to get enough current from MAX232 when higher current >> operational amplifier will be used instead of OPA2705. >> >> If we don't need negative voltage to control OCXO we can even connect >> -5V power path to ground. The OPA2705 amplifier works as rail to rail on >> the input and output what is shown on the original diagram. >> >> >> The known problem is voltage translating between 3,3V CMOS level GPS >> receiver and 5V logic PIC CPU. >> This year Texas Instruments introduced SN74LV1T...series logic level >> translators. >> http://www.ti.com/lsds/ti/logic/little-logic-little-translation.page?DCMP=hval_sll_log_sn74lv1t_en&HQS=hval-sll-log-sn74lv1t-pp-en >> Simply insert non-inverting functor as SN74LV1T125/126 or ..08 between >> low voltage GPS receiver and 5V PIC microcontroller. >> >> 73, de Michal >> sp2iqw >> >> >> >> W dniu 2014-12-14 o 04:11, Dave Platt pisze: >>>> I'm having difficulty understanding how to create the proper voltage >>>> source >>>> for the VE2ZAZ control board, -5 to +5 volts. Any suggestions? >>> There are several approaches. >>> >>> If you start with a single-voltage supply (say, a +12 or +24 - whatever >>> your oscillator requires) you can add an additional regulator to get a >>> clean +5 supply for the board's oscillator-control output. Since you >>> only need a small current, a simple 78L05 regulator and a couple of >>> filter caps would be all you need. >>> >>> The -5 is more difficult. The most straightforward way is to use a >>> commercially-made or home-made power supply with both positive and >>> negative outputs... say, a +/- 15 (these are relatively common) and then >>> use a negative voltage regulator such as a 7905 to regulate the -15 down >>> to -5. >>> >>> You could buy a kit such as the Chaney C6895 from Electronics >>> Goldmine... this has three variable output voltages (positive and >>> negative up to 15 volts, at 400 mA, and positive up to 21 volts at 1 >>> ampere). This might be your best bet, if 1 amp is enough to run the >>> oscillator with its heater and the main VE2ZAZ input - the two >>> low-current outputs could be set to +5 and -5 and provided to the VE2ZAZ >>> output circuit. >>> >>> It *is* possible to start with a single-voltage DC supply, and generate >>> positive and negative voltages from it. It's a bit tricky. One >>> approach is to use a switching-type "inverting regulator" to create the >>> negative voltage. Alltronics has a +12 in, -5 out (Astec AA7600), $8 >>> for two. These switching inverters might not be a great solution for a >>> GPSDO where you want really low noise, though. >>> >>> Another approach is to start with something like a 24-volt DC supply, >>> and use a 7805 linear regulator to create an "artificial ground" (which >>> then becomes the "GND" power input to your VE2ZAZ board). >>> >>> If I were you I'd probably look for a multiple-output DC power supply... >>> Electronics Goldmine, Alltronics, All Electronics, Marlin P Jones are >>> all good on-line vendors to check. >>> >>> And... as an out-of-the-box possibility - although your HP oscillator >>> has a -5 to +5 tuning range, there's no law that says you have to >>> actually *use* the whole tuning range. You could have the VE2ZAZ board >>> put out a tuning voltage between 0 and 5 (so no negative supply >>> required) and use the HP oscillator's "FREQ ADJUST" trimmer to >>> rough-tune the oscillator so that it's right about on-frequency when the >>> VE2ZAZ is feeding a mid-scale output (2.5 volts) to the oscillator's >>> EFC input. >>> >>> This would let you get away with just positive power supply voltages to >>> the oscillator oven, oscillator input, and VE2ZAZ. >>> >>> >>> >>> ______________________________________________________________ >>> GPS_Standard mailing list >>> Home:http://mailman.qth.net/mailman/listinfo/gps_standard >>> Help:http://mailman.qth.net/mmfaq.htm >>> Post:mailto:GPS_Standard at mailman.qth.net >>> >>> This list hosted by:http://www.qsl.net >>> Please help support this email list:http://www.qsl.net/donate.html >>> >> >> >> >> >> ------------------------------ >> >> Subject: Digest Footer >> >> _______________________________________________ >> GPS_Standard mailing list >> GPS_Standard at mailman.qth.net >> http://mailman.qth.net/mailman/listinfo/gps_standard >> >> >> ------------------------------ >> >> End of GPS_Standard Digest, Vol 69, Issue 2 >> ******************************************* >> > ______________________________________________________________ > GPS_Standard mailing list > Home: http://mailman.qth.net/mailman/listinfo/gps_standard > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:GPS_Standard at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com From vk6jy at iinet.net.au Wed Dec 17 20:05:15 2014 From: vk6jy at iinet.net.au (John-Y) Date: Thu, 18 Dec 2014 09:05:15 +0800 Subject: [GPS_Standard] Fwd: Re: GPS_Standard Digest, Vol 69, Issue 2 In-Reply-To: <54921BA2.7080900@iinet.net.au> References: <54921BA2.7080900@iinet.net.au> Message-ID: <5492284B.5050801@iinet.net.au>