Yes, life is too short to power a radio from a cheap power supply.   Remember, 
the life and performance of your radio depends on it. 

Bob, K4TAX


Sent from my iPhone

> On Oct 29, 2015, at 10:32 AM, gerald finn <grf...@earthlink.net> wrote:
> 
> 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-requ...@mailman.qth.net
>> Sent: Oct 29, 2015 7:41 AM
>> To: elecraft@mailman.qth.net
>> Subject: Elecraft Digest, Vol 138, Issue 40
>> 
>> Send Elecraft mailing list submissions to
>>    elecraft@mailman.qth.net
>> 
>> To subscribe or unsubscribe via the World Wide Web, visit
>>    http://mailman.qth.net/mailman/listinfo/elecraft
>> or, via email, send a message with subject or body 'help' to
>>    elecraft-requ...@mailman.qth.net
>> 
>> You can reach the person managing the list at
>>    elecraft-ow...@mailman.qth.net
>> 
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of Elecraft digest..."
>> 
>> 
>> 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" <fsh...@rochester.rr.com>
>> To: <elecraft@mailman.qth.net>
>> Subject: [Elecraft] KX3 to Computer
>> Message-ID: <000001d111c3$5a521a00$0ef64e00$@rochester.rr.com>
>> 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 <mar...@the-wallers.net>
>> To: Forest Shick <fsh...@rochester.rr.com>,
>>    "elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
>> Subject: Re: [Elecraft] KX3 to Computer
>> Message-ID:
>>    <908986974.6767064.1446067269138.javamail.ya...@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 
>> <fsh...@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@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 mar...@the-wallers.net
>> 
>> 
>> 
>> 
>> ------------------------------
>> 
>> Message: 3
>> Date: Wed, 28 Oct 2015 22:24:56 +0100
>> From: Guy F2CT <f...@wanadoo.fr>
>> To: elecraft@mailman.qth.net
>> Subject: [Elecraft] K3 and Wsjt
>> Message-ID: <7nnbgyeix10vxamp0v89fe3r.1446067496...@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 <kk7p4...@gmail.com>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] KX3 to Computer
>> Message-ID: <563141b3.2060...@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 <mar...@the-wallers.net>
>> To: Lyle Johnson <kk7p4...@gmail.com>
>> Cc: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
>> Subject: Re: [Elecraft] KX3 to Computer
>> Message-ID: <c080977b-9964-4332-993b-86a79d323...@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 <kk7p4...@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@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 mar...@the-wallers.net
>> 
>> 
>> ------------------------------
>> 
>> Message: 6
>> Date: Wed, 28 Oct 2015 15:16:51 -0700
>> From: "Lynn W. Taylor, WB6UUT" <k...@coldrockshotbrooms.com>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] KX3 to Computer
>> Message-ID: <56314953.7030...@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 <mar...@the-wallers.net>
>> To: "Lynn W. Taylor, WB6UUT" <k...@coldrockshotbrooms.com>
>> Cc: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
>> Subject: Re: [Elecraft] KX3 to Computer
>> Message-ID: <08251545-92e4-4083-b71b-88ae4f6ba...@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" 
>>> <k...@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@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 mar...@the-wallers.net
>> 
>> 
>> ------------------------------
>> 
>> Message: 8
>> Date: Wed, 28 Oct 2015 18:33:51 -0400
>> From: William Evans <w4...@w4ish.net>
>> To: Elecraft@mailman.qth.net
>> Subject: [Elecraft] For Sale:  K3 Xtal Filters
>> Message-ID: <d7ea3e0e-4ba9-491d-bc27-5faf7d375...@w4ish.net>
>> Content-Type: text/plain; charset="us-ascii"
>> 
>> 
>> 
>> ------------------------------
>> 
>> Message: 9
>> Date: Wed, 28 Oct 2015 22:35:47 +0000
>> From: "Cady, Fred" <fc...@montana.edu>
>> To: GRANT YOUNGMAN <n...@tx.rr.com>, Elecraft Reflector
>>    <elecraft@mailman.qth.net>
>> Subject: Re: [Elecraft] KX3 AGC HLD settings
>> Message-ID:
>>    
>> <cy1pr0201mb08091b6d5f1cf70a341a8a03af...@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-boun...@mailman.qth.net> on behalf of GRANT 
>> YOUNGMAN <n...@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@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 fc...@montana.edu
>> 
>> 
>> ------------------------------
>> 
>> Message: 10
>> Date: Wed, 28 Oct 2015 18:38:38 -0400
>> From: William Evans <w4...@w4ish.net>
>> To: Elecraft@mailman.qth.net
>> Subject: [Elecraft] K3 Xtal Filters for sale (really!)
>> Message-ID: <86c7005c-7677-4373-b18f-be58280f5...@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....@gmail.com>
>> To: "'William Evans'" <w4...@w4ish.net>,    <Elecraft@mailman.qth.net>
>> Subject: Re: [Elecraft] For Sale:  K3 Xtal Filters
>> Message-ID: <000701d111d1$924fb7b0$b6ef2710$@gmail.com>
>> Content-Type: text/plain;    charset="us-ascii"
>> 
>> Which ones? How much?
>> 
>> Thanks and 73,
>> 
>> --Ian
>> Ian Kahn, KM4IK
>> Roswell, GA  EM74ua
>> km4ik....@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-boun...@mailman.qth.net] On Behalf Of
>> William Evans
>> Sent: Wednesday, October 28, 2015 6:34 PM
>> To: Elecraft@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@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....@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 <w...@bellsouth.net>
>> To: elecraft@mailman.qth.net
>> Subject: [Elecraft] Icoms answer to the KX3??
>> Message-ID: <b6c72488-a9b5-4689-9b8b-0f76ea582...@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" <k...@coldrockshotbrooms.com>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] Icoms answer to the KX3??
>> Message-ID: <5631533c.6050...@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 <w4...@w4ish.net>
>> To: Elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3 Xtal Filters for sale (really!)
>> Message-ID: <524458ed-6117-4798-a4b7-82fd91ba7...@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 <w4...@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@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 w4...@w4ish.net
>> 
>> 
>> 
>> ------------------------------
>> 
>> Message: 15
>> Date: Wed, 28 Oct 2015 23:33:18 +0000
>> From: David Woolley <for...@david-woolley.me.uk>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
>> Message-ID: <56315b3e.5050...@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 <mtebe...@mchsi.com>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3 and Wsjt
>> Message-ID: <56315fd5.6070...@mchsi.com>
>> Content-Type: text/plain; charset="windows-1252"
>> 
>> 
>> 
>> ------------------------------
>> 
>> Message: 17
>> Date: Wed, 28 Oct 2015 20:19:53 -0400
>> From: Don Wilhelm <w3...@embarqmail.com>
>> To: David Woolley <for...@david-woolley.me.uk>,
>>    elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
>> Message-ID: <56316629.5000...@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 <n...@elecraft.com>
>> To: Joe W2KJ <w...@bellsouth.net>
>> Cc: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] Icoms answer to the KX3??
>> Message-ID: <9c1fc112-2aed-4f41-8cb3-ad09a928d...@elecraft.com>
>> Content-Type: text/plain; charset=us-ascii
>> 
>> Joe W2KJ <w...@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 <rmcg...@blomand.net>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
>> Message-ID: <56317432.3060...@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 <k6...@foothill.net>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
>> Message-ID: <56317aba.5070...@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 <rmcg...@blomand.net>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
>> Message-ID: <56317fad.8000...@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 <arcticp...@yahoo.no>
>> To: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
>> Subject: Re: [Elecraft] Icoms answer to the KX3??
>> Message-ID:
>>    <1717313154.7097159.1446106505116.javamail.ya...@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 <w...@bellsouth.net>
>> Til: elecraft@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@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 arcticp...@yahoo.no
>> 
>> 
>> 
>> 
>> ------------------------------
>> 
>> Message: 23
>> Date: Thu, 29 Oct 2015 08:20:28 -0000
>> From: "Ian White" <gm3...@ifwtech.co.uk>
>> To: <elecraft@mailman.qth.net>
>> Subject: Re: [Elecraft] K3S In-Depth Review Coming Soon?
>> Message-ID: <006601d11222$b0e8a640$12b9f2c0$@co.uk>
>> 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.baerts...@bluewin.ch>
>> To: Martin Storli - LA8OKA <arcticp...@yahoo.no>
>> Cc: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
>> Subject: Re: [Elecraft] Icoms answer to the KX3??
>> Message-ID: <5d13c9f8-65a7-4747-adf3-e4a4f9c4d...@bluewin.ch>
>> Content-Type: text/plain;    charset=us-ascii
>> 
>>> Am 29.10.2015 um 09:15 schrieb Martin Storli - LA8OKA <arcticp...@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 <w...@bellsouth.net>
>>> Til: elecraft@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@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 arcticp...@yahoo.no
>>> 
>>> 
>>> 
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Elecraft@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.baerts...@bluewin.ch
>> 
>> 
>> ------------------------------
>> 
>> Message: 25
>> Date: Thu, 29 Oct 2015 07:51:53 -0400
>> From: Peter Pauly <ppa...@gmail.com>
>> To: Elecraft Reflector <elecraft@mailman.qth.net>
>> Subject: [Elecraft] Which of these would make the best power supply
>>    for the    K3(S)?
>> Message-ID:
>>    <cakxfwbsilv4+pam0pvfb88e-ypif1zej27jibs1g-fqjm9b...@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.lapo...@gmail.com>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] KRC2 rs232 to cpu not working
>> Message-ID: <56320c12.7040...@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@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.lapo...@gmail.com
>> 
>> 
>> -- 
>> Gordon - N1MGO
>> 
>> 
>> 
>> ------------------------------
>> 
>> Message: 27
>> Date: Thu, 29 Oct 2015 07:26:47 -0500
>> From: Bob McGraw - K4TAX <rmcg...@blomand.net>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] Which of these would make the best power
>>    supply for the K3(S)?
>> Message-ID: <56321087.7030...@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 <k...@comcast.net>
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] Which of these would make the best power
>>    supply for    the K3(S)?
>> Message-ID: <1446123946333-7609688.p...@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 <fr...@k5dkz.com>
>> To: elecraft@mailman.qth.net
>> Subject: [Elecraft] IMD and supply voltage
>> Message-ID: <20151029090941.cb6c6879f85ba959f9627...@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 <w3...@embarqmail.com>
>> To: frank <fr...@k5dkz.com>, elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] IMD and supply voltage
>> Message-ID: <56323015.6050...@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@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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> Help: http://mailman.qth.net/mmfaq.htm
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> 
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