I agree the Astrons are hard to beat I use a pair of 70A supplies for my station and have several others a 35 and 2 20 amp supplies for spares.
Fred N0AZZ Sent from my iPad > On Oct 29, 2015, at 3:41 PM, Phil Hystad <[email protected]> wrote: > > >> On Oct 29, 2015, at 8:41 AM, Robert <[email protected]> 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 <[email protected]> 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: [email protected] >>>> Sent: Oct 29, 2015 7:41 AM >>>> To: [email protected] >>>> Subject: Elecraft Digest, Vol 138, Issue 40 >>>> >>>> Send Elecraft mailing list submissions to >>>> [email protected] >>>> >>>> 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 >>>> [email protected] >>>> >>>> You can reach the person managing the list at >>>> [email protected] >>>> >>>> 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" <[email protected]> >>>> To: <[email protected]> >>>> Subject: [Elecraft] KX3 to Computer >>>> Message-ID: <[email protected]> >>>> Content-Type: text/plain; charset="us-ascii" >>>> >>>> What is the easiest way to connect the KX3 to a computer for RTTY, PSK31 & >>>> SSTV. I have purchased the cable set. I connect the KX3 - Phones connector >>>> to the computer audio in and I can receive RTTY & SSTV. If I connect the >>>> computer audio out to the KX3 MIC, the radio goes into transmit. I would >>>> guess this is because the connector on the cable is incorrect for the MIC >>>> connector - too few contacts. >>>> >>>> >>>> >>>> So how do you connect the audio for transmitting? >>>> >>>> Thank You >>>> >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 2 >>>> Date: Wed, 28 Oct 2015 21:21:09 +0000 (UTC) >>>> From: Martin Waller <[email protected]> >>>> To: Forest Shick <[email protected]>, >>>> "[email protected]" <[email protected]> >>>> Subject: Re: [Elecraft] KX3 to Computer >>>> Message-ID: >>>> <[email protected]> >>>> 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 >>>> <[email protected]> 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:[email protected] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> Message delivered to [email protected] >>>> >>>> >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 3 >>>> Date: Wed, 28 Oct 2015 22:24:56 +0100 >>>> From: Guy F2CT <[email protected]> >>>> To: [email protected] >>>> Subject: [Elecraft] K3 and Wsjt >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] KX3 to Computer >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: Lyle Johnson <[email protected]> >>>> Cc: "[email protected]" <[email protected]> >>>> Subject: Re: [Elecraft] KX3 to Computer >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> 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:[email protected] >>>>> >>>>> This list hosted by: http://www.qsl.net >>>>> Please help support this email list: http://www.qsl.net/donate.html >>>>> Message delivered to [email protected] >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 6 >>>> Date: Wed, 28 Oct 2015 15:16:51 -0700 >>>> From: "Lynn W. Taylor, WB6UUT" <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] KX3 to Computer >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: "Lynn W. Taylor, WB6UUT" <[email protected]> >>>> Cc: "[email protected]" <[email protected]> >>>> Subject: Re: [Elecraft] KX3 to Computer >>>> Message-ID: <[email protected]> >>>> 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" >>>>> <[email protected]> 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:[email protected] >>>>> >>>>> This list hosted by: http://www.qsl.net >>>>> Please help support this email list: http://www.qsl.net/donate.html >>>>> Message delivered to [email protected] >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 8 >>>> Date: Wed, 28 Oct 2015 18:33:51 -0400 >>>> From: William Evans <[email protected]> >>>> To: [email protected] >>>> Subject: [Elecraft] For Sale: K3 Xtal Filters >>>> Message-ID: <[email protected]> >>>> Content-Type: text/plain; charset="us-ascii" >>>> >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 9 >>>> Date: Wed, 28 Oct 2015 22:35:47 +0000 >>>> From: "Cady, Fred" <[email protected]> >>>> To: GRANT YOUNGMAN <[email protected]>, Elecraft Reflector >>>> <[email protected]> >>>> 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 <[email protected]> on behalf of GRANT >>>> YOUNGMAN <[email protected]> >>>> 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:[email protected] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> Message delivered to [email protected] >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 10 >>>> Date: Wed, 28 Oct 2015 18:38:38 -0400 >>>> From: William Evans <[email protected]> >>>> To: [email protected] >>>> Subject: [Elecraft] K3 Xtal Filters for sale (really!) >>>> Message-ID: <[email protected]> >>>> 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" <[email protected]> >>>> To: "'William Evans'" <[email protected]>, <[email protected]> >>>> Subject: Re: [Elecraft] For Sale: K3 Xtal Filters >>>> Message-ID: <[email protected]> >>>> Content-Type: text/plain; charset="us-ascii" >>>> >>>> Which ones? How much? >>>> >>>> Thanks and 73, >>>> >>>> --Ian >>>> Ian Kahn, KM4IK >>>> Roswell, GA EM74ua >>>> [email protected] >>>> 10-10 #74624, North Georgia Chapter #2038 >>>> PODXS 070 #1962 >>>> K3# 281, P3 #688, KAT500 #860, KPA500 #1468 >>>> >>>> >>>> -----Original Message----- >>>> From: Elecraft [mailto:[email protected]] On Behalf Of >>>> William Evans >>>> Sent: Wednesday, October 28, 2015 6:34 PM >>>> To: [email protected] >>>> 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:[email protected] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html Message >>>> delivered to [email protected] >>>> >>>> >>>> --- >>>> 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 <[email protected]> >>>> To: [email protected] >>>> Subject: [Elecraft] Icoms answer to the KX3?? >>>> Message-ID: <[email protected]> >>>> 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" <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] Icoms answer to the KX3?? >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] K3 Xtal Filters for sale (really!) >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> 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:[email protected] >>>>> >>>>> This list hosted by: http://www.qsl.net >>>>> Please help support this email list: http://www.qsl.net/donate.html >>>>> Message delivered to [email protected] >>>> >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 15 >>>> Date: Wed, 28 Oct 2015 23:33:18 +0000 >>>> From: David Woolley <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] K3 and Wsjt >>>> Message-ID: <[email protected]> >>>> Content-Type: text/plain; charset="windows-1252" >>>> >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 17 >>>> Date: Wed, 28 Oct 2015 20:19:53 -0400 >>>> From: Don Wilhelm <[email protected]> >>>> To: David Woolley <[email protected]>, >>>> [email protected] >>>> Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: Joe W2KJ <[email protected]> >>>> Cc: [email protected] >>>> Subject: Re: [Elecraft] Icoms answer to the KX3?? >>>> Message-ID: <[email protected]> >>>> Content-Type: text/plain; charset=us-ascii >>>> >>>> Joe W2KJ <[email protected]> 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 <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: "[email protected]" <[email protected]> >>>> Subject: Re: [Elecraft] Icoms answer to the KX3?? >>>> Message-ID: >>>> <[email protected]> >>>> 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 <[email protected]> >>>> Til: [email protected] >>>> 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:[email protected] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> Message delivered to [email protected] >>>> >>>> >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 23 >>>> Date: Thu, 29 Oct 2015 08:20:28 -0000 >>>> From: "Ian White" <[email protected]> >>>> To: <[email protected]> >>>> Subject: Re: [Elecraft] K3S In-Depth Review Coming Soon? >>>> Message-ID: <[email protected]> >>>> Content-Type: text/plain; charset="us-ascii" >>>> >>>> Apologies once again - this message sent yesterday to G3RXQ was meant to >>>> be copied to the whole group. >>>> >>>> >>>> ------------------------------------------ >>>> >>>> You are right, Stewart. >>>> >>>> Please cancel that whole paragraph about the KIO3B. Apologies to the >>>> group for spreading my confusion worldwide. >>>> >>>> >>>> 73 from Ian GM3SEK >>>> >>>> >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 24 >>>> Date: Thu, 29 Oct 2015 09:34:57 +0100 >>>> From: Heinz B?rtschi <[email protected]> >>>> To: Martin Storli - LA8OKA <[email protected]> >>>> Cc: "[email protected]" <[email protected]> >>>> Subject: Re: [Elecraft] Icoms answer to the KX3?? >>>> Message-ID: <[email protected]> >>>> Content-Type: text/plain; charset=us-ascii >>>> >>>>> Am 29.10.2015 um 09:15 schrieb Martin Storli - LA8OKA >>>>> <[email protected]>: >>>>> >>>>> ... "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 <[email protected]> >>>>> Til: [email protected] >>>>> 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:[email protected] >>>>> >>>>> This list hosted by: http://www.qsl.net >>>>> Please help support this email list: http://www.qsl.net/donate.html >>>>> Message delivered to [email protected] >>>>> >>>>> >>>>> >>>>> ______________________________________________________________ >>>>> Elecraft mailing list >>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>>> Help: http://mailman.qth.net/mmfaq.htm >>>>> Post: mailto:[email protected] >>>>> >>>>> This list hosted by: http://www.qsl.net >>>>> Please help support this email list: http://www.qsl.net/donate.html >>>>> Message delivered to [email protected] >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 25 >>>> Date: Thu, 29 Oct 2015 07:51:53 -0400 >>>> From: Peter Pauly <[email protected]> >>>> To: Elecraft Reflector <[email protected]> >>>> 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 <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] KRC2 rs232 to cpu not working >>>> Message-ID: <[email protected]> >>>> 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:[email protected] >>>>> >>>>> This list hosted by: http://www.qsl.net >>>>> Please help support this email list: http://www.qsl.net/donate.html >>>>> Message delivered to [email protected] >>>> >>>> >>>> -- >>>> Gordon - N1MGO >>>> >>>> >>>> >>>> ------------------------------ >>>> >>>> Message: 27 >>>> Date: Thu, 29 Oct 2015 07:26:47 -0500 >>>> From: Bob McGraw - K4TAX <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] Which of these would make the best power >>>> supply for the K3(S)? >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: [email protected] >>>> Subject: Re: [Elecraft] Which of these would make the best power >>>> supply for the K3(S)? >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: [email protected] >>>> Subject: [Elecraft] IMD and supply voltage >>>> Message-ID: <[email protected]> >>>> 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 <[email protected]> >>>> To: frank <[email protected]>, [email protected] >>>> Subject: Re: [Elecraft] IMD and supply voltage >>>> Message-ID: <[email protected]> >>>> 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: [email protected] >>>> 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:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [email protected] >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
