On Sun, May 13, 2018 at 5:17 PM, <donov...@starpower.net> wrote: > Its hard to devise a solution without this knowledge!
Frank, It's also hard to suggest a solution without a clear understanding of the problem, which seems different than N3CW's original question. It's not clear to me what you need to achieve at NSS. I think you are saying you want listen to *both* widely-separated frequencies at the same time, using different antennas, one for the MAIN, one for the SUB? Or maybe you want to use the TX antenna for both receivers? Or maybe a separate RX antenna for both receivers? The SUB listens to either what is selected by MAIN (RX ANT or TX ANT) or to AUX, which is a totally separate RX ANT input that seems to bypass all the filters in the MAIN. With the SUB on, hold RX ANT to switch the SubRx to listen on AUX. This is a perfect input if your RX antenna is miles away from your TX antenna, which I assume is the case at NSS. Otherwise, if you want to listen to the TX ANT with both receivers, feed RX ANT OUT to *both* RX ANT IN *and* to AUX via an external 50 ohm splitter such as the Mini-Circuits ZFSC-2-6 <https://www.minicircuits.com/pdfs/ZFSC-2-6%2B.pdf>, and now both receivers are listening to the same antenna, but with totally different receive paths. If you want to listen to a dedicated well-separated RX antenna in both receivers, instead of listening on the TX antenna, use an external splitter to feed the RX antenna to both RX ANT IN and to AUX. Repeating, do not use SPLIT mode, just tap SUB to TX on A, receive on both A and B, or just receive on B (CONFIG:L-MIX-R B B), whatever you require. 73, Bob, N6TV On Sun, May 13, 2018 at 4:45 PM, <donov...@starpower.net> wrote: > Hi Wayne, > > > The MARS to ham band K3 cross-band problem affects every band, > but it was extremely severe on 30 meters because the NSS assigned > frequency -- 9448 kHz -- was almost 700 kHz from our typical > 10128 kHz receiving frequency. > > > Since switching between the K3 bandpass filters and the KBPF3 > band pass filters at T/R rates isn't a workable solution, how about > this external BNC cable solution since my K3 transceivers have > KRX3 sub receivers? > > > If I understand the K3 internal receiver antenna switching correctly > a single external BNC jumper cable allows the K3 to transmit and > receive on VFO A on MARS frequencies and listen to any amateur > band on the sub receiver: > > > - Connect the RX ANT OUT connector to the RX ANT IN connector > > > - Tap the main RX ANT button which connects ANT 1 to the RX ANT OUT > connector and switches the input of the main receiver to the RX ANT IN > connector (connected by the external BNC cable to RX ANT OUT) > > > - Tap SUB to turn the sub receiver on > > > - Hold BSET and tap ANT to set the sub receiver input to MAIN. This > allows the subreceiver to listen on the RX ANT connected to the main > receiver. > > > I'm sorry I didn't think of this yesterday... > > > tks > > > 73 > Frank > W3LPL ______________________________________________________________ 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
