[GPS_Standard] GPS_Standard Digest, Vol 69, Issue 2
John-Y
vk6jy at iinet.net.au
Wed Dec 17 20:02:59 EST 2014
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
> <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" <mark.fancher at twc.com>
>> To: <gps_standard at mailman.qth.net>
>> Subject: Re: [GPS_Standard] -5 to +5 Voltage Source
>> Message-ID: <[email protected]>
>> 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: <w0ep at w0ep.us>
>> To: "Mark Fancher" <mark.fancher at twc.com>,
>> 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: <w0ep at w0ep.us>
>> To: "Mark Fancher" <mark.fancher at twc.com>,
>> 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: <w0ep at w0ep.us>
>> Date: Sun, December 14, 2014 2:21 pm
>> To: "Mark Fancher" <mark.fancher at twc.com>, 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" <mark.fancher at twc.com>
>> Date: Sun, December 14, 2014 5:35 am
>> To: <gps_standard at mailman.qth.net>
>>
>> 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 <w9sz.zack at gmail.com>
>> To: gps_standard <gps_standard at mailman.qth.net>
>> Subject: Re: [GPS_Standard] -5 to +5 Voltage Source
>> Message-ID:
>> <CANJxhWjZXasR3Trb9vFST4fxd74ox9-8U0eyv8RsmNvvaTQgdQ at mail.gmail.com>
>> 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 <dplatt at radagast.org> 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 <michal at e2000.gdynia.pl>
>> 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
More information about the GPS_Standard
mailing list