[Elecraft] Which of these would make the best power supply for the K3(S)?
gerald finn
grfinn at earthlink.net
Thu Oct 29 11:32:58 EDT 2015
For powering my Elecraft K3S and P3, I am using the Astron RS-35 power supply feeding a West Mountain DC-to-Go PWR gate PG40S and Rigrunner 4007U with a 79 Amp hour battery.
Living on an island, we have many spikes and losses of power during the year. I figure that if I'm spending a sizable amount for my rig, I should have a good power supply.
-----Original Message-----
>From: elecraft-request at mailman.qth.net
>Sent: Oct 29, 2015 7:41 AM
>To: elecraft at mailman.qth.net
>Subject: Elecraft Digest, Vol 138, Issue 40
>
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>
>Today's Topics:
>
> 1. KX3 to Computer (Forest Shick)
> 2. Re: KX3 to Computer (Martin Waller)
> 3. K3 and Wsjt (Guy F2CT)
> 4. Re: KX3 to Computer (Lyle Johnson)
> 5. Re: KX3 to Computer (martin waller)
> 6. Re: KX3 to Computer (Lynn W. Taylor, WB6UUT)
> 7. Re: KX3 to Computer (martin waller)
> 8. For Sale: K3 Xtal Filters (William Evans)
> 9. Re: KX3 AGC HLD settings (Cady, Fred)
> 10. K3 Xtal Filters for sale (really!) (William Evans)
> 11. Re: For Sale: K3 Xtal Filters (Ian - Ham)
> 12. Icoms answer to the KX3?? (Joe W2KJ)
> 13. Re: Icoms answer to the KX3?? (Lynn W. Taylor, WB6UUT)
> 14. Re: K3 Xtal Filters for sale (really!) (William Evans)
> 15. Re: K3 - PSK31 - AGC/No AGC (David Woolley)
> 16. Re: K3 and Wsjt (Michael Eberle)
> 17. Re: K3 - PSK31 - AGC/No AGC (Don Wilhelm)
> 18. Re: Icoms answer to the KX3?? (Wayne Burdick)
> 19. Re: K3 - PSK31 - AGC/No AGC (Bob McGraw - K4TAX)
> 20. Re: K3 - PSK31 - AGC/No AGC (Fred Jensen)
> 21. Re: K3 - PSK31 - AGC/No AGC (Bob McGraw - K4TAX)
> 22. Re: Icoms answer to the KX3?? (Martin Storli - LA8OKA)
> 23. Re: K3S In-Depth Review Coming Soon? (Ian White)
> 24. Re: Icoms answer to the KX3?? (Heinz B?rtschi)
> 25. Which of these would make the best power supply for the
> K3(S)? (Peter Pauly)
> 26. Re: KRC2 rs232 to cpu not working (Gordon LaPoint)
> 27. Re: Which of these would make the best power supply for the
> K3(S)? (Bob McGraw - K4TAX)
> 28. Re: Which of these would make the best power supply for the
> K3(S)? (Mike K2MK)
> 29. IMD and supply voltage (frank)
> 30. Re: IMD and supply voltage (Don Wilhelm)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Wed, 28 Oct 2015 16:58:09 -0400
>From: "Forest Shick" <fshick at rochester.rr.com>
>To: <elecraft at mailman.qth.net>
>Subject: [Elecraft] KX3 to Computer
>Message-ID: <[email protected]>
>Content-Type: text/plain; charset="us-ascii"
>
>What is the easiest way to connect the KX3 to a computer for RTTY, PSK31 &
>SSTV. I have purchased the cable set. I connect the KX3 - Phones connector
>to the computer audio in and I can receive RTTY & SSTV. If I connect the
>computer audio out to the KX3 MIC, the radio goes into transmit. I would
>guess this is because the connector on the cable is incorrect for the MIC
>connector - too few contacts.
>
>
>
>So how do you connect the audio for transmitting?
>
>Thank You
>
>
>
>------------------------------
>
>Message: 2
>Date: Wed, 28 Oct 2015 21:21:09 +0000 (UTC)
>From: Martin Waller <martin at the-wallers.net>
>To: Forest Shick <fshick at rochester.rr.com>,
> "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] KX3 to Computer
>Message-ID:
> <908986974.6767064.1446067269138.JavaMail.yahoo at mail.yahoo.com>
>Content-Type: text/plain; charset=UTF-8
>
>Hi,
>Good questions. I have been playing with RTTY myself this last few days and hit just that problem. I have been holding the microphone infront of the PC speaker in the interim as that worked as a temporary solution.
>I would like to know the best way of doing this too.
>MartinG0PJO
>
>
> On Wednesday, 28 October 2015, 20:58, Forest Shick <fshick at rochester.rr.com> wrote:
>
>
> What is the easiest way to connect the KX3 to a computer for RTTY, PSK31 &
>SSTV. I have purchased the cable set. I connect the KX3 - Phones connector
>to the computer audio in and I can receive RTTY & SSTV. If I connect the
>computer audio out to the KX3 MIC, the radio goes into transmit. I would
>guess this is because the connector on the cable is incorrect for the MIC
>connector - too few contacts.
>
>
>
>So how do you connect the audio for transmitting?
>
>Thank You
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Elecraft 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 delivered to martin at the-wallers.net
>
>
>
>
>------------------------------
>
>Message: 3
>Date: Wed, 28 Oct 2015 22:24:56 +0100
>From: Guy F2CT <f2ct at wanadoo.fr>
>To: elecraft at mailman.qth.net
>Subject: [Elecraft] K3 and Wsjt
>Message-ID: <7nnbgyeix10vxamp0v89fe3r.1446067496430 at email.android.com>
>Content-Type: text/plain; charset=utf-8
>
>Hello
>I need some help in order to use my K3 + K144XV in JT modes.
>What's the best adaptor between K3 and PC ?
>Thanks a lot for help.
>Kundest Regards
>
>Cordiales 73
>Guy F2CT
>
>------------------------------
>
>Message: 4
>Date: Wed, 28 Oct 2015 14:44:19 -0700
>From: Lyle Johnson <kk7p4dsp at gmail.com>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] KX3 to Computer
>Message-ID: <563141B3.2060005 at gmail.com>
>Content-Type: text/plain; charset=utf-8; format=flowed
>
>Disable the mic buttons (see menu items) and use VOX (or a serial port
>command) to switch between Tx and Rx depending on your program's features.
>
>And be sure to set MIG GAIN to ZERO then gradually increase it to get
>the 4-5 bars of ALC indication. If the MIC GAIN is too high for the
>computer's audio level, the ALC bar graph and the transmit audio levels
>may not respond properly (this is a bug on my short list to fix).
>
>73,
>
>Lyle KK7P
>
>> Good question...I have been holding the microphone infront of the PC speaker in the interim as that worked as a temporary solution.
>> ...
>>
>> What is the easiest way to connect the KX3 to a computer for RTTY, PSK31 &
>> SSTV...
>>
>> So how do you connect the audio for transmitting?
>
>
>
>------------------------------
>
>Message: 5
>Date: Wed, 28 Oct 2015 22:01:20 +0000
>From: martin waller <martin at the-wallers.net>
>To: Lyle Johnson <kk7p4dsp at gmail.com>
>Cc: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] KX3 to Computer
>Message-ID: <C080977B-9964-4332-993B-86A79D323B3E at the-wallers.net>
>Content-Type: text/plain; charset=us-ascii
>
>Hi Lyle
>
>Many thanks for the complete explanation. I'll give it a whirl.
>
>Martin
>G0PJO
>
>Sent from my iPhone
>
>> On 28 Oct 2015, at 21:44, Lyle Johnson <kk7p4dsp at gmail.com> wrote:
>>
>> Disable the mic buttons (see menu items) and use VOX (or a serial port command) to switch between Tx and Rx depending on your program's features.
>>
>> And be sure to set MIG GAIN to ZERO then gradually increase it to get the 4-5 bars of ALC indication. If the MIC GAIN is too high for the computer's audio level, the ALC bar graph and the transmit audio levels may not respond properly (this is a bug on my short list to fix).
>>
>> 73,
>>
>> Lyle KK7P
>>
>>> Good question...I have been holding the microphone infront of the PC speaker in the interim as that worked as a temporary solution.
>>> ...
>>>
>>> What is the easiest way to connect the KX3 to a computer for RTTY, PSK31 &
>>> SSTV...
>>>
>>> So how do you connect the audio for transmitting?
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft 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 delivered to martin at the-wallers.net
>
>
>------------------------------
>
>Message: 6
>Date: Wed, 28 Oct 2015 15:16:51 -0700
>From: "Lynn W. Taylor, WB6UUT" <KX3 at ColdRocksHotBrooms.com>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] KX3 to Computer
>Message-ID: <56314953.7030200 at ColdRocksHotBrooms.com>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>This looks useful: https://k4mtx.wordpress.com/2013/04/11/kx3-fldigi-setup/
>
>It's specific to FLDIGI, but all of the soundcard modes require pretty
>much the same wiring.
>
>Please note: if you hold the microphone to the PC speaker, the
>microphone will pick up background noise and transmit that all over the
>band.
>
>Generally speaking, you'll be operating in a part of the band that
>discourages wideband noise.
>
>73 -- Lynn
>
>
>------------------------------
>
>Message: 7
>Date: Wed, 28 Oct 2015 22:29:28 +0000
>From: martin waller <martin at the-wallers.net>
>To: "Lynn W. Taylor, WB6UUT" <KX3 at ColdRocksHotBrooms.com>
>Cc: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] KX3 to Computer
>Message-ID: <08251545-92E4-4083-B71B-88AE4F6BAB78 at the-wallers.net>
>Content-Type: text/plain; charset=us-ascii
>
>Hi
>
>Thanks for the tip about holding the microphone! I've only played on 2m so far so I should not have upset too many people!
>
>Martin
>
>Sent from my iPhone
>
>> On 28 Oct 2015, at 22:16, "Lynn W. Taylor, WB6UUT" <KX3 at ColdRocksHotBrooms.com> wrote:
>>
>> This looks useful: https://k4mtx.wordpress.com/2013/04/11/kx3-fldigi-setup/
>>
>> It's specific to FLDIGI, but all of the soundcard modes require pretty much the same wiring.
>>
>> Please note: if you hold the microphone to the PC speaker, the microphone will pick up background noise and transmit that all over the band.
>>
>> Generally speaking, you'll be operating in a part of the band that discourages wideband noise.
>>
>> 73 -- Lynn
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft 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 delivered to martin at the-wallers.net
>
>
>------------------------------
>
>Message: 8
>Date: Wed, 28 Oct 2015 18:33:51 -0400
>From: William Evans <w4ish at w4ish.net>
>To: Elecraft at mailman.qth.net
>Subject: [Elecraft] For Sale: K3 Xtal Filters
>Message-ID: <D7EA3E0E-4BA9-491D-BC27-5FAF7D375FD5 at w4ish.net>
>Content-Type: text/plain; charset="us-ascii"
>
>
>
>------------------------------
>
>Message: 9
>Date: Wed, 28 Oct 2015 22:35:47 +0000
>From: "Cady, Fred" <fcady at montana.edu>
>To: GRANT YOUNGMAN <nq5t at tx.rr.com>, Elecraft Reflector
> <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] KX3 AGC HLD settings
>Message-ID:
> <CY1PR0201MB08091B6D5F1CF70A341A8A03AF210 at CY1PR0201MB0809.namprd02.prod.outlook.com>
>
>Content-Type: text/plain; charset="Windows-1252"
>
>Hi Grant,
>When I did my KX3 books I somehow figured out it is 0.00 to 2.00 seconds. That's what the K3 does and I assume the KX3 is the same.
>Cheers,
>Fred KE7X
>
>Author of:
>?The Elecraft K3S and P3 ? Getting the Most out from Your High Performance Station?.
>"The Elecraft K3: Design, Configuration and Operation 2nd ed"
>"The Portable Elecraft KX3 ? Going for the Summit with the KX3 and KX3-2M/4M"
>?The Elecraft KX-Line ? The Complete Station?
>?The Elecraft KPA500 and KAT500 ? the K-Line Dream Station?
>Printed, coil bound copies of these are all available at www.elecraft.com
>PDF files available from www.ke7x.com
>?The Elecraft KXPA100, PX3 and 2M/4M Transverters ? Assembling the KX3-Line Station? printed copy available at www.lulu.com and pdf from www.ke7x.com.
>Plus a book dedicated to the K3S upgrades for the K3 and a 3rd Edition of the K3 book are works in progress.
>Free guides at ke7x.com
>KPA500 and KAT500 Quick Set Up Guide
>http://www.ke7x.com/home/k-line-introduction-and-set-up-guide
>KAT500 and KXPA500 Tuner Operation
>http://www.ke7x.com/home/kat500-and-kxpa100-tuners
>
>
>________________________________________
>From: Elecraft <elecraft-bounces at mailman.qth.net> on behalf of GRANT YOUNGMAN <nq5t at tx.rr.com>
>Sent: Wednesday, October 28, 2015 10:07 AM
>To: Elecraft Reflector
>Subject: [Elecraft] KX3 AGC HLD settings
>
>The KX3 manual indicates that the AGC HLD setting is in ?seconds?. It doesn?t appear that ?001? in the three digit display is one second.
>
>I suspect its either ?(.)XXX? seconds or ?X(.)XX? seconds. I must have missed something in the book somewhere. A search on Nabble, update history, etc. didn?t go anywhere either.
>
>Can someone shed some light?
>
>Thanks ? Grant NQ5T
>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Elecraft 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 delivered to fcady at montana.edu
>
>
>------------------------------
>
>Message: 10
>Date: Wed, 28 Oct 2015 18:38:38 -0400
>From: William Evans <w4ish at w4ish.net>
>To: Elecraft at mailman.qth.net
>Subject: [Elecraft] K3 Xtal Filters for sale (really!)
>Message-ID: <86C7005C-7677-4373-B18F-BE58280F5A27 at w4ish.net>
>Content-Type: text/plain; charset=us-ascii
>
>KFL3A-6K 8 pole filter for K3 or K3S $110 - includes shipping CONUS
>KFL3A-400 8-Pole filter for K3 or K3S $110 - includes shipping CONUS
>
>both for $210 including shipping
>
>Bill
>W4ish @ w4ish.net
>
>
>------------------------------
>
>Message: 11
>Date: Wed, 28 Oct 2015 18:39:56 -0400
>From: "Ian - Ham" <km4ik.ian at gmail.com>
>To: "'William Evans'" <w4ish at w4ish.net>, <Elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] For Sale: K3 Xtal Filters
>Message-ID: <[email protected]>
>Content-Type: text/plain; charset="us-ascii"
>
>Which ones? How much?
>
>Thanks and 73,
>
>--Ian
>Ian Kahn, KM4IK
>Roswell, GA EM74ua
>km4ik.ian at gmail.com
>10-10 #74624, North Georgia Chapter #2038
>PODXS 070 #1962
>K3# 281, P3 #688, KAT500 #860, KPA500 #1468
>
>
>-----Original Message-----
>From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
>William Evans
>Sent: Wednesday, October 28, 2015 6:34 PM
>To: Elecraft at mailman.qth.net
>Subject: [Elecraft] For Sale: K3 Xtal Filters
>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Elecraft 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
>delivered to km4ik.ian at gmail.com
>
>
>---
>This email has been checked for viruses by Avast antivirus software.
>https://www.avast.com/antivirus
>
>
>
>------------------------------
>
>Message: 12
>Date: Wed, 28 Oct 2015 18:48:42 -0400
>From: Joe W2KJ <w2kj at bellsouth.net>
>To: elecraft at mailman.qth.net
>Subject: [Elecraft] Icoms answer to the KX3??
>Message-ID: <B6C72488-A9B5-4689-9B8B-0F76EA582320 at bellsouth.net>
>Content-Type: text/plain; charset=us-ascii
>
>Howdy Fellow Elecrafters:
>
>Saw something new from Icom called the IC7300.
>
>Looks like a direct conversion architecture ala the KX3 but larger in size, I believe.
>
>The KX3 might have been the first such multi-band design with front panel display, knobs. buttons, etc, similar to traditional superhet transceivers and it appears that Icom is following the lead.
>
>Would love to see the technical specs on this new rig.
>
> 73, Joe W2KJ
> KX3/KXPA100
>
>------------------------------
>
>Message: 13
>Date: Wed, 28 Oct 2015 15:59:08 -0700
>From: "Lynn W. Taylor, WB6UUT" <KX3 at ColdRocksHotBrooms.com>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] Icoms answer to the KX3??
>Message-ID: <5631533C.6050901 at ColdRocksHotBrooms.com>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>It has a Touch Screen! Sweet!!
>
><ducking>
>
>On 10/28/2015 3:48 PM, Joe W2KJ wrote:
>> Howdy Fellow Elecrafters:
>>
>> Saw something new from Icom called the IC7300.
>>
>> Looks like a direct conversion architecture ala the KX3 but larger in size, I believe.
>>
>> The KX3 might have been the first such multi-band design with front panel display, knobs. buttons, etc, similar to traditional superhet transceivers and it appears that Icom is following the lead.
>>
>> Would love to see the technical specs on this new rig.
>>
>> 73, Joe W2KJ
>> KX3/KXPA100
>
>
>------------------------------
>
>Message: 14
>Date: Wed, 28 Oct 2015 19:00:37 -0400
>From: William Evans <w4ish at w4ish.net>
>To: Elecraft at mailman.qth.net
>Subject: Re: [Elecraft] K3 Xtal Filters for sale (really!)
>Message-ID: <524458ED-6117-4798-A4B7-82FD91BA7836 at w4ish.net>
>Content-Type: text/plain; charset=us-ascii
>
>Gentlemen,
>the 6K filter is spoken for (pending payment) Thanks
>
>Bill
>W4ISH
>> On Oct 28, 2015, at 6:38 PM, William Evans <w4ish at w4ish.net> wrote:
>>
>> KFL3A-6K 8 pole filter for K3 or K3S $110 - includes shipping CONUS
>> KFL3A-400 8-Pole filter for K3 or K3S $110 - includes shipping CONUS
>>
>> both for $210 including shipping
>>
>> Bill
>> W4ish @ w4ish.net
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft 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 delivered to w4ish at w4ish.net
>
>
>
>------------------------------
>
>Message: 15
>Date: Wed, 28 Oct 2015 23:33:18 +0000
>From: David Woolley <forums at david-woolley.me.uk>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
>Message-ID: <56315B3E.5050404 at david-woolley.me.uk>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>Although I hadn't noticed it before, I would say that design in the K2
>is more about stability and DC offsets than anything to do with pick up
>of the BFO. The balanced demodulator and last two crystals deal with that.
>
>The old, basically AM sets, used high level, unbalanced detectors. That
>required more total gain from aerial to detector, although that might be
>split between RF and two IF frequencies.
>
>Balanced detectors can work with much lower level signals, which is
>particularly helpful for a single conversion design, like the K2.
>However, the AGC detector doesn't want to be balanced, and with a low
>level signal, would have a large DC offset, that might exceed the wanted
>rectified AGC, therefore additional gain is needed before the AGC
>detector. If this were done at the IF frequency, the gain from input to
>output at one frequency would be much greater, and proportionately less
>stray coupling would be needed to make the whole system oscillate. By
>shifting the frequency, which can be done at low signal levels, the
>design reduces the gain at any one frequency.
>
>The risk with doing all at one frequency is not pickup of the BFO at the
>input of the IF amplifier, but pickup of its own output.
>
>If there were leakage of the BFO it would get amplified just as much as
>if additional gain was tapped off at the same point and amplified at the
>original frequency. The design seems to rely on the balance of the
>detector and the two pole crystal filter, to stop the BFO getting into
>the AGC path, and not the difference in frequency.
>
>--
>David Woolley
>Owner K2 06123
>On 28/10/15 03:15, Ron D'Eau Claire wrote:
>
>>
>> The most successful solutions (before SDR technology took over) were to
>> split the I.F. with a second mixer that was far removed from the main I.F.
>> the second I.F. was used to generate the AGC voltage and, since it was on a
>> wholly different frequency from the main I.F. the BFO didn't trigger the
>> AGC. In fact, the Elecraft K2 uses that technique quite successfully.
>
>
>
>------------------------------
>
>Message: 16
>Date: Wed, 28 Oct 2015 18:52:54 -0500
>From: Michael Eberle <mteberle at mchsi.com>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] K3 and Wsjt
>Message-ID: <56315FD5.6070804 at mchsi.com>
>Content-Type: text/plain; charset="windows-1252"
>
>
>
>------------------------------
>
>Message: 17
>Date: Wed, 28 Oct 2015 20:19:53 -0400
>From: Don Wilhelm <w3fpr at embarqmail.com>
>To: David Woolley <forums at david-woolley.me.uk>,
> elecraft at mailman.qth.net
>Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
>Message-ID: <56316629.5000603 at embarqmail.com>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>David,
>
>I do not understand your logic.
>Let's divorce the AGC from the product detector for a moment. The K2
>takes the input to the AGC circuit from the IF and converts it to a
>frequency that is removed from the IF signal. The AGC circuit produces
>a DC voltage that is used to control the gain of the IF amplifier - period.
>That has nothing to do with balanced or unbalanced - the output is a a
>DC voltage which is applied to the IF amplifier to control its gain.
>
>That means that the only signals applied to the product detector are the
>incoming signal (already controlled by the AGC) and the BFO.
>
>Yes, receivers of old did not use product detectors (mixers) but used a
>diode detector, and the BFO signal was injected along with the IF signal
>to produce the audio output. The BFO injection level was fixed, and
>therefore the gain of the IF input to the detector had to be matched to
>the BFO level for proper demodulation to occur. The result is that one
>had to ride the RF Gain to make the levels of the IF signal and the BFO
>work in harmony with each other. In addition, the AGC was developed
>after the detector, so in those old receivers, it was best to turn off
>the AGC.
>
>That is not true for receivers using a product detector. BFO pickup is
>not a problem with a product detector as long as the output of the mixer
>(product detector) is restricted to a bandpass that contains only the
>audio frequencies (the input frequencies - BFO and IF - are rejected
>leaving only the audio content).
>
>Those old operating habits (ride the RF Gain and set the AF Gain at max)
>are still being used by some operators, but it is not necessary for
>modern receivers which use product detectors - the K2 is included in
>that list.
>
>73,
>Don W3FPR
>
>On 10/28/2015 7:33 PM, David Woolley wrote:
>> Although I hadn't noticed it before, I would say that design in the K2
>> is more about stability and DC offsets than anything to do with pick
>> up of the BFO. The balanced demodulator and last two crystals deal
>> with that.
>>
>> The old, basically AM sets, used high level, unbalanced detectors.
>> That required more total gain from aerial to detector, although that
>> might be split between RF and two IF frequencies.
>>
>> Balanced detectors can work with much lower level signals, which is
>> particularly helpful for a single conversion design, like the K2.
>> However, the AGC detector doesn't want to be balanced, and with a low
>> level signal, would have a large DC offset, that might exceed the
>> wanted rectified AGC, therefore additional gain is needed before the
>> AGC detector. If this were done at the IF frequency, the gain from
>> input to output at one frequency would be much greater, and
>> proportionately less stray coupling would be needed to make the whole
>> system oscillate. By shifting the frequency, which can be done at low
>> signal levels, the design reduces the gain at any one frequency.
>>
>> The risk with doing all at one frequency is not pickup of the BFO at
>> the input of the IF amplifier, but pickup of its own output.
>>
>> If there were leakage of the BFO it would get amplified just as much
>> as if additional gain was tapped off at the same point and amplified
>> at the original frequency. The design seems to rely on the balance of
>> the detector and the two pole crystal filter, to stop the BFO getting
>> into the AGC path, and not the difference in frequency.
>>
>
>
>
>------------------------------
>
>Message: 18
>Date: Wed, 28 Oct 2015 17:44:50 -0700
>From: Wayne Burdick <n6kr at elecraft.com>
>To: Joe W2KJ <w2kj at bellsouth.net>
>Cc: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] Icoms answer to the KX3??
>Message-ID: <9C1FC112-2AED-4F41-8CB3-AD09A928D26B at elecraft.com>
>Content-Type: text/plain; charset=us-ascii
>
>Joe W2KJ <w2kj at bellsouth.net> wrote:
>
>> Howdy Fellow Elecrafters:
>>
>> Saw something new from Icom called the IC7300.
>>
>> Looks like a direct conversion architecture ala the KX3 but larger in size, I believe.
>
>Based on Icom's published specs, by volume it is 7.5 times larger than the KX3.
>
>Wayne
>N6KR
>
>
>
>------------------------------
>
>Message: 19
>Date: Wed, 28 Oct 2015 20:19:46 -0500
>From: Bob McGraw - K4TAX <rmcgraw at blomand.net>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
>Message-ID: <56317432.3060800 at blomand.net>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>Don is absolutely correct.
>
>As many may know, I do assist hams with issues associated with many
>different products here and elsewhere. The biggest issue I encounter is
>the ham that says " well somebody told me to.... blah blah blah blah
>......and it would work best". In many cases, nothing could be further
>from the truth. I find today that many hams are more prone to have and
>use old school thinking and methods trying to be used with today's
>radios. I find this applies to many facets of ham radio equipment as
>being used today.
>
>As I've told many, if you expect the radio to operate like a Kenwood,
>ICOM or Yaesu, it darn well better say Kenwood, ICOM or Yaesu on the
>front panel. Otherwise stated, learn to use the Elecraft radio
>correctly in order to attain optimum performance, for indeed they do not
>operate like the others.
>
>73
>Bob, K4TAX
>K3S s/n 10163
>
>
>On 10/28/2015 7:19 PM, Don Wilhelm wrote:
>> Those old operating habits (ride the RF Gain and set the AF Gain at
>> max) are still being used by some operators, but it is not necessary
>> for modern receivers which use product detectors - the K2 is included
>> in that list.
>>
>> 73,
>> Don W3FPR
>
>
>
>
>------------------------------
>
>Message: 20
>Date: Wed, 28 Oct 2015 18:47:38 -0700
>From: Fred Jensen <k6dgw at foothill.net>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
>Message-ID: <56317ABA.5070605 at foothill.net>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>How do I set the AGC on my loose coupler receiver? :-) I'm old, but
>I've never used the RF Gain on my K3.
>
>73,
>
>Fred K6DGW
>- Northern California Contest Club
>- CU in the Cal QSO Party 1-2 Oct 2016
>- www.cqp.org
>
>On 10/28/2015 6:19 PM, Bob McGraw - K4TAX wrote:
>> Don is absolutely correct.
>>
>> As many may know, I do assist hams with issues associated with many
>> different products here and elsewhere. The biggest issue I encounter is
>> the ham that says " well somebody told me to.... blah blah blah blah
>> .....and it would work best". In many cases, nothing could be further
>> from the truth. I find today that many hams are more prone to have and
>> use old school thinking and methods trying to be used with today's
>> radios. I find this applies to many facets of ham radio equipment as
>> being used today.
>>
>> As I've told many, if you expect the radio to operate like a Kenwood,
>> ICOM or Yaesu, it darn well better say Kenwood, ICOM or Yaesu on the
>> front panel. Otherwise stated, learn to use the Elecraft radio
>> correctly in order to attain optimum performance, for indeed they do not
>> operate like the others.
>>
>> 73
>> Bob, K4TAX
>> K3S s/n 10163
>
>
>
>------------------------------
>
>Message: 21
>Date: Wed, 28 Oct 2015 21:08:45 -0500
>From: Bob McGraw - K4TAX <rmcgraw at blomand.net>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
>Message-ID: <56317FAD.8000504 at blomand.net>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>Back in 1923, in order to receive a signal, the following adjustments
>must be made and possibly repeated to get the optimum performance (not a
>simple matter and easily upset): The input coil (inside box) is adjusted
>to resonate at the desired receiving frequency using the two tap
>selectors on the front panel of the box.The inductance of the secondary
>coil is set by its tapping switch and tuned by a capacitor to suit the
>frequency being received. Moving the secondary coil in and out of the
>primary (in the box) allows coupling to adjusted for maximum
>performance. With coil pushed in, the sensitivity will be high and the
>selectivity will be poor. The reverse occurs with the coil pulled out.
>
>73
>Bob, K4TAX
>
>On 10/28/2015 8:47 PM, Fred Jensen wrote:
>
>How do I set the AGC on my loose coupler receiver?
>
>
>
>------------------------------
>
>Message: 22
>Date: Thu, 29 Oct 2015 08:15:05 +0000 (UTC)
>From: Martin Storli - LA8OKA <arcticpeak at yahoo.no>
>To: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] Icoms answer to the KX3??
>Message-ID:
> <1717313154.7097159.1446106505116.JavaMail.yahoo at mail.yahoo.com>
>Content-Type: text/plain; charset=UTF-8
>
>When it comes to RF architecture, the IC-7300 is nothing like the KX3, it's actually a step ahead, because it's not a Direct Conversion, but a RF Direct sampling?.
>ICOM didn't follow Elecraft on this one. They rather follow FlexRadio, the russian Expert Electronics and the italian Elad amongst other. So many are going Down this road now, it's hard to tell who's first.
>The KX3 wasn't the first Direct Conversion?SDR receiver with knobs either, there where several smaler manufactures just prior to the KX3.But KX3 might claim to be the first commersial success, but that is more to?due to?the strong?Elecraft brand and the KX1 legassy than due to innovation.And, it's a good transceiver, so it deserves the success regardless of the RF architecture employed.
>Best regards
>Martin Storli LA8OKAOslo, Norway ?ARCTICPEAK's Radio pages! http://www.arcticpeak.com/radio.htm
> Fra: Joe W2KJ <w2kj at bellsouth.net>
> Til: elecraft at mailman.qth.net
> Sendt: Onsdag, 28. oktober 2015 23.48
> Emne: [Elecraft] Icoms answer to the KX3??
>
>Howdy Fellow Elecrafters:
>
>Saw something new from Icom called the IC7300.
>
>Looks like a direct conversion architecture ala the KX3 but larger in size,? I believe.
>
>The KX3 might have been the first such multi-band design with front panel display, knobs. buttons, etc, similar to traditional superhet transceivers and it appears that Icom is following the lead.
>
>Would love to see the technical specs on this new rig.
>
>??? ??? ??? 73, Joe W2KJ
>??? ??? ??? KX3/KXPA100
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Elecraft 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 delivered to arcticpeak at yahoo.no
>
>
>
>
>------------------------------
>
>Message: 23
>Date: Thu, 29 Oct 2015 08:20:28 -0000
>From: "Ian White" <gm3sek at ifwtech.co.uk>
>To: <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] K3S In-Depth Review Coming Soon?
>Message-ID: <[email protected]>
>Content-Type: text/plain; charset="us-ascii"
>
>Apologies once again - this message sent yesterday to G3RXQ was meant to
>be copied to the whole group.
>
>
>------------------------------------------
>
>You are right, Stewart.
>
>Please cancel that whole paragraph about the KIO3B. Apologies to the
>group for spreading my confusion worldwide.
>
>
>73 from Ian GM3SEK
>
>
>
>
>------------------------------
>
>Message: 24
>Date: Thu, 29 Oct 2015 09:34:57 +0100
>From: Heinz B?rtschi <heinz.baertschi at bluewin.ch>
>To: Martin Storli - LA8OKA <arcticpeak at yahoo.no>
>Cc: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] Icoms answer to the KX3??
>Message-ID: <5D13C9F8-65A7-4747-ADF3-E4A4F9C4D75C at bluewin.ch>
>Content-Type: text/plain; charset=us-ascii
>
>Am 29.10.2015 um 09:15 schrieb Martin Storli - LA8OKA <arcticpeak at yahoo.no>:
>>
>> ... "The KX3 wasn't the first Direct Conversion SDR receiver with knobs either, there where several smaler manufactures just prior to the KX3."
>
>Yes, maybe the ADAT-200 designed by Hans HB9CBU was the very first such transceiver. Enjoy!
>http://www.adat.ch/index_e.html
>
>73, Heinz HB9BCB
>
>
>
>
>
>> Fra: Joe W2KJ <w2kj at bellsouth.net>
>> Til: elecraft at mailman.qth.net
>> Sendt: Onsdag, 28. oktober 2015 23.48
>> Emne: [Elecraft] Icoms answer to the KX3??
>>
>> Howdy Fellow Elecrafters:
>>
>> Saw something new from Icom called the IC7300.
>>
>> Looks like a direct conversion architecture ala the KX3 but larger in size, I believe.
>>
>> The KX3 might have been the first such multi-band design with front panel display, knobs. buttons, etc, similar to traditional superhet transceivers and it appears that Icom is following the lead.
>>
>> Would love to see the technical specs on this new rig.
>>
>> 73, Joe W2KJ
>> KX3/KXPA100
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft 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 delivered to arcticpeak at yahoo.no
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft 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 delivered to heinz.baertschi at bluewin.ch
>
>
>------------------------------
>
>Message: 25
>Date: Thu, 29 Oct 2015 07:51:53 -0400
>From: Peter Pauly <ppauly at gmail.com>
>To: Elecraft Reflector <elecraft at mailman.qth.net>
>Subject: [Elecraft] Which of these would make the best power supply
> for the K3(S)?
>Message-ID:
> <CAKXfWbSiLv4+paM0pvfb88e-yPif1zeJ27jiBs1G-fqJM9bqFQ at mail.gmail.com>
>Content-Type: text/plain; charset=UTF-8
>
>I'm looking at the Meanwell power supplies because they are cheap and seem
>to be well regarded. I've come up with these two choices, feel free to give
>more suggestions of other models. I've seen talk on this reflector of
>supplying more than 13.8V to the K3S so that's why I'm looking at the 15V
>model.
>
>12V Model: Meanwell NES-350-12
>Voltage range 10-13.5V
>29A
>
>
>15V Model: Meanwell NES-350-15
>Voltage range 13.5-18V
>23.2A
>
>
>The 15 volt model would seem to be the obvious choice, except that it
>doesn't supply the recommended 25 amps. The K3S manual says 22 amps typical
>though.
>
>Is there another model Meanwell I should be looking at that has better
>protection or filtering?
>
>I've already got an Astron switching power supply, the Meanwell would be a
>second alternative.
>
>
>------------------------------
>
>Message: 26
>Date: Thu, 29 Oct 2015 08:07:46 -0400
>From: Gordon LaPoint <gordon.lapoint at gmail.com>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] KRC2 rs232 to cpu not working
>Message-ID: <56320C12.7040306 at gmail.com>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>All,
> I found the problem. My serial cable had a broken wire on pin
>2. I had used the serial cable on my KPA-500 and it was working. Must
>have broken when I removed it from the system and used it to test the
>KRC2. Thanks for all the pointers and help! Murphy is so busy at my QTH,
>hope he leaves soon!
>
>Thank you,
>Gordon - N1MGO
>
>On 10/25/2015 08:54 AM, Don Wilhelm wrote:
>> John,
>>
>> Actually a standard serial cable can be connected to the KRC2 if
>> jumpers W11 thru W20 are removed, no need to cut off wires in the cable.
>> That information *is* in the plugging configuration charts.
>>
>> 73,
>> Don W3FPR
>>
>> On 10/25/2015 8:43 AM, John K9UWA wrote:
>>>
>>> A simple statement in the KRC2 manual could have been added by Elecraft
>>> stating. To Program your KRC2 to your K3 radio get a standard DB9 serial
>>> cable. and CUT OFF all wires EXCEPT 2, 3 and 5. Mark the cable Program
>>> KCR2 ONLY and save the cable for future use. I wonder how many
>>> additional KRC2 boxes Elecraft could have sold over the last 4 years?
>>>
>>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft 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 delivered to gordon.lapoint at gmail.com
>
>
>--
>Gordon - N1MGO
>
>
>
>------------------------------
>
>Message: 27
>Date: Thu, 29 Oct 2015 07:26:47 -0500
>From: Bob McGraw - K4TAX <rmcgraw at blomand.net>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] Which of these would make the best power
> supply for the K3(S)?
>Message-ID: <56321087.7030205 at blomand.net>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>An Astron SS-30M is a much better supply and will supply the required
>current. It has excellent regulation and IS NOT a noise generator.
>Plus it has a volt meter and amp meter on the front panel.
>
>73
>Bob, K4TAX
>K3S s/n 10163
>
>On 10/29/2015 6:51 AM, Peter Pauly wrote:
>> I'm looking at the Meanwell power supplies because they are cheap and ........
>
>
>
>
>------------------------------
>
>Message: 28
>Date: Thu, 29 Oct 2015 06:05:46 -0700 (MST)
>From: Mike K2MK <k2mk at comcast.net>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] Which of these would make the best power
> supply for the K3(S)?
>Message-ID: <1446123946333-7609688.post at n2.nabble.com>
>Content-Type: text/plain; charset=us-ascii
>
>Hi Peter,
>
>I bought the Astron RS-35M for my $4000 K3 in 2008. I've never turned it off
>and I've never even given it a second thought. No fan, no RF noise, just
>reliable DC.
>
>73,
>Mike K2MK
>
>
>
>Peter Pauly wrote
>> I'm looking at the Meanwell power supplies because they are cheap and seem
>> to be well regarded. I've come up with these two choices, feel free to
>> give
>> more suggestions of other models. I've seen talk on this reflector of
>> supplying more than 13.8V to the K3S so that's why I'm looking at the 15V
>> model.
>>
>> 12V Model: Meanwell NES-350-12
>> Voltage range 10-13.5V
>> 29A
>>
>>
>> 15V Model: Meanwell NES-350-15
>> Voltage range 13.5-18V
>> 23.2A
>>
>>
>> The 15 volt model would seem to be the obvious choice, except that it
>> doesn't supply the recommended 25 amps. The K3S manual says 22 amps
>> typical
>> though.
>>
>> Is there another model Meanwell I should be looking at that has better
>> protection or filtering?
>>
>> I've already got an Astron switching power supply, the Meanwell would be a
>> second alternative.
>
>
>
>
>
>--
>View this message in context: http://elecraft.365791.n2.nabble.com/Which-of-these-would-make-the-best-power-supply-for-the-K3-S-tp7609685p7609688.html
>Sent from the Elecraft mailing list archive at Nabble.com.
>
>
>------------------------------
>
>Message: 29
>Date: Thu, 29 Oct 2015 09:09:41 -0600
>From: frank <frank at k5dkz.com>
>To: elecraft at mailman.qth.net
>Subject: [Elecraft] IMD and supply voltage
>Message-ID: <20151029090941.cb6c6879f85ba959f9627203 at k5dkz.com>
>Content-Type: text/plain; charset=US-ASCII
>
>This subject keeps cropping up. Is this a serious issue ?
>
>I have heard that IMD improves by 10db with a one volt increase in supply voltage. Is this really the case or just a measurement error? 10db is a large difference. One volt is a small variation.
>
>What is the minimum acceptable IMD? How linear does the amp need to be? If 36db is better than 26db is 100db even better or just overkill?
>
>Are other solid state amplifier products similarly effected?
>
>What is the IMD performance of the K3S at 10 watts over a supply voltage variation from 11 volts to 14.7 volts? I ask because I believe those ten watts are generated by Dmos devices as well. Do these devices only misbehave with varying supply voltage at higher (100w) power levels and lower supply voltages?
>
>Should I wait to purchase a K3S until this issue is resolved? (Assuming this is a valid issue)
>
>Back in the good old days we used to solve problems. Today we don't have problems, just issues.
>
>--
>Frank - K5DKZ
>KX3 - 7550
>PX3 - 1143
>KXPA100 - 1566
>
>
>------------------------------
>
>Message: 30
>Date: Thu, 29 Oct 2015 10:41:25 -0400
>From: Don Wilhelm <w3fpr at embarqmail.com>
>To: frank <frank at k5dkz.com>, elecraft at mailman.qth.net
>Subject: Re: [Elecraft] IMD and supply voltage
>Message-ID: <56323015.6050807 at embarqmail.com>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>Frank,
>
>I think the "issue" is one of some hams wanting to make what is good
>already into something better.
>If you look closely you should discover that this is a situation common
>to *all* 100 watt class amplifiers that are supposed to run on a nominal
>'12 volt' supply. That voltage level is chosen because it is common for
>vehicle batteries, so most transceivers are designed around that voltage
>- the K3S is just one of those.
>
>Using an increased voltage power supply will drastically reduce the
>transmit IMD, and that is true for all those 100 watt class amplifiers.
>Bottom line is that I don't think it will be "fixed" in the K3S - I
>don't think it can be fixed in any of the 100 watt class solid state
>amplifiers.
>
>So the thing to do is to run the power supply voltage up to near 15
>volts (but not above), and do not operate with "all knobs to the right".
>Many hams seen to want to squeeze all the power output that they can
>from a transceiver, so you will put a cleaner signal on the air if you
>set the power to 100 watts rather than trying to squeeze that last 20
>extra watts out of an amplifier.
>
>73,
>Don W3FPR
>
>On 10/29/2015 11:09 AM, frank wrote:
>> This subject keeps cropping up. Is this a serious issue ?
>>
>> I have heard that IMD improves by 10db with a one volt increase in supply voltage. Is this really the case or just a measurement error? 10db is a large difference. One volt is a small variation.
>>
>> What is the minimum acceptable IMD? How linear does the amp need to be? If 36db is better than 26db is 100db even better or just overkill?
>>
>> Are other solid state amplifier products similarly effected?
>>
>> What is the IMD performance of the K3S at 10 watts over a supply voltage variation from 11 volts to 14.7 volts? I ask because I believe those ten watts are generated by Dmos devices as well. Do these devices only misbehave with varying supply voltage at higher (100w) power levels and lower supply voltages?
>>
>> Should I wait to purchase a K3S until this issue is resolved? (Assuming this is a valid issue)
>>
>>
>
>
>
>------------------------------
>
>Subject: Digest Footer
>
>_______________________________________________
>Elecraft mailing list
>Post to: Elecraft at mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/elecraft
>You must be a subscriber to post.
>Elecraft web page: http://www.elecraft.com
>
>------------------------------
>
>End of Elecraft Digest, Vol 138, Issue 40
>*****************************************
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