Duplex operation on K3
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Is there a way to get the K3 to operate duplex (Tx on one band while rx on another)? For the K3 with second rx, of course.
I would like to operate mode A satellite with AO-7 (tx on 2m and rx on 10m). I'd also monitor a second band while contesting with my K3 without the expense of buying a second K3 when the one I have already has two rxs. My antennas are well separated and I have extensive external band pass filtering for contest use. 73 Bill AA7XT ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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I'm also interested in this operation (although for a different
application). Here's the email exchange so far, looks like maybe after the kx3 if we keep the question alive. Mark n2qt copied messages below From: Gary Surrency Sent: Tuesday, February 07, 2012 12:46 PM To: Mark n2qt Subject: N2QT Re: k3 subrx Hi Mark, Sorry. Nothing more has been done on that. Wayne is deep into KX3 development. -- 73, Gary AB7MY ========= [hidden email] Elecraft Technical Support On 2/7/2012 10:28 AM, Mark n2qt wrote: a long time back (see below) Wayne mentioned it might be possible to use the subrx while transmitting on another band. Did anything come of this. I can test or try things if that would help. Mark n2qt -----Original Message----- From: Wayne Burdick Sent: Friday, October 16, 2009 10:32 AM To: Bill W4ZV Cc: elecraft at mailman.qth.net Subject: Re: [Elecraft] K3: SO2R-in-a-box It may be possible to do full duplex with the sub receiver on a different band and antenna from main, since it's very well-shielded. I'll give this a try. Some firmware changes will be required. 73, Wayne -----Original Message----- From: William Hein Sent: Monday, March 19, 2012 11:01 AM To: [hidden email] Subject: [Elecraft] Duplex operation on K3 Is there a way to get the K3 to operate duplex (Tx on one band while rx on another)? For the K3 with second rx, of course. I would like to operate mode A satellite with AO-7 (tx on 2m and rx on 10m). I'd also monitor a second band while contesting with my K3 without the expense of buying a second K3 when the one I have already has two rxs. My antennas are well separated and I have extensive external band pass filtering for contest use. 73 Bill AA7XT ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by William Hein-3
A subject I am also interested in. The key with the K3 would be
having the KRX3 subreceiver and using Rx antenna input for receiving the satellite downlink. The subreceiver IF is easily tapped to provide signal to a radio like the SDR-IQ. BUT the question is if the hardware connections will allow the subreceiver to operate while the K3 transmits. If the hardware path is possible then I am guessing firmware can be done to do this. Using the 15-KHz K3 DSP receiver at the same time as the DSP Tx is probably impossible so I am thinking the key is using another receiver on the subRx IF output. I will be setting my K3 + DEMI L432-28 for uplink and the KX3 + KX3-2M for downlink (in the interim). Of course both will need to be tuned in freq. to compensate for Doppler shift. I believe both radios are capable of computer control, but not sure there is any sw that can control two separate radios (K3 and KX3 specifically)? Otherwise it becomes an exercise in right-hand/left-hand (and getting the brain to handle that?). The fortunate thing is uplink tuning is rarely needed on FM Leo sats (a shrinking list). For linear transponder satellites like VO-52, SSB requires adjusting both VFO's with a pretty lively Doppler effect. Now try sending CW, as well (how fast can you send with your big toe?). I had both the FT-847 (a superb satellite radio) and the FT-817 (not duplex but a suitable radio) operating satellite in simplex. Both are sold and replaced by the K3 (and soon to be KX3). 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? DUBUS Magazine USA Rep [hidden email] "Kits made by KL7UW" http://www.kl7uw.com/kits.htm ====================================== ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by William Hein-3
Keep this request alive! Please Please Please!
And, Elecraft folks, if you can get this done before next November, I will be forever in your debt (now that I have the way to make the KRX3 output its IF to the P3!) Although I have my KRX3 set to receive a second band (through the AUX input), Im still at the mercy of my PTT on the main band. Sure would be great to be able to listen DURING CQ's on the main band! What would be really slick, and I may build one up, is a small board with a relay that would enable switching the IF output to the P3 between receivers. Maybe use the DIGOUT contact as the switch... Program up a macro, assign it to one of the DVK keys (Since I dont have a DVK, those keys are macro heaven!), then rock and roll with SO1.5R :) This board sounds like something up Phil AD5X's alley. His QSK board for the ALS600 could easily be pressed into service for this if Elecraft decides not to make it themselves. Phil's board is about 80% there already. Finally, I promise to never do SS with a 7700 again! (SS SSB SOLP Unassisted rankings for W4LT: 2009=#8 with K3 single RX; 2010=#6 with K3/KRX3; 2011=#10 with IC7700/IC756Pro2 2nd radio... same antennas, same amount of time, same microphone, etc, etc!) -lu-w4lt- Tampa, FL Using the "AL K-LINE": K3/P3/ALS600/MFJ998 Al Kaline: Detroit Tigers slugger from the 1960's ===================== Message: 37 Date: Mon, 19 Mar 2012 11:53:56 -0400 From: "Mark n2qt" <[hidden email]> Subject: Re: [Elecraft] Duplex operation on K3 To: "William Hein" <[hidden email]>, <[hidden email]> Message-ID: <A9EFB78E192045BFA21424CE02E9591E@Win7PC> Content-Type: text/plain; format=flowed; charset=iso-8859-1; reply-type=original I'm also interested in this operation (although for a different application). Here's the email exchange so far, looks like maybe after the kx3 if we keep the question alive. Mark n2qt ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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