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 ----- Original Message ----- From: "Wayne Burdick" <n...@elecraft.com> To: "Elecraft" <elecraft@mailman.qth.net> Sent: Sunday, May 13, 2018 4:06:51 PM Subject: Re: [Elecraft] K3 Strange Power Output Problem I have to admit, operating SPLIT between a ham band and a MARS band that falls outside the nearest ham-band filter isn’t something that occurred to me when writing the firmware. But I can change the filter selection algorithm to accommodate this case as long as a KBPF3 module is installed. Technical details: Since the K3/K3S is a downconversion superhet, we use very narrow ham-band filters. One of the narrowest is the 30 meter filter. To preserve the rig’s exceptional dynamic range, we switch the band pass filters with relays, not diodes. This means we can’t switch filters at T/R rates. So to handle the case being discussed, we’d have to select the 7-10 MHz KBPF3 filter for both RX and TX. 73, Wayne N6KR ---- http://www.elecraft.com > On May 13, 2018, at 6:10 AM, Wes Stewart <wes_n...@triconet.org> wrote: > > Another reading comprehension problem. > >> On 5/12/2018 1:36 PM, Mark E. Musick wrote: >> Hi Ed, >> You don't have a transmit problem at all. It is not an anomaly. >> The amateur band starts at 10.100 MHz. You shouldn't be transmitting below >> that frequency. >> >> Hello, >> I noticed this power output anomaly today while trying to work the NSS >> station. My K3 was in split mode, transmitting on 10.113.5. > > ______________________________________________________________ > 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 n...@elecraft.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 donov...@starpower.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 arch...@mail-archive.com
