> On Oct 29, 2015, at 8:41 AM, Robert <rmcg...@blomand.net> wrote: > > 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 > >
Ditto! There is nothing better than a rock solid Astron power supply. I am yet another guy who leaves the Astron on 24x7 unless we leave for vacation of more than a day. My Astrons (I have two) are Linear because in the rare case that they need some repair I am more easily able to repair them (less complicated). So far, none of my Astrons have failed so that is a weak reason for a linear supply. Well, I do like them because they are heavy and are better at staying in one place. 73, phil, K7PEH > 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 >>> ***************************************** >> ______________________________________________________________ >> 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 rmcg...@blomand.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 phys...@mac.com ______________________________________________________________ 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 arch...@mail-archive.com
