This will work with either a K4 or a K4D. The VFOs can be on the same or different bands.
If the two receivers were on different bands, and you only had one antenna, you'd want to make VFO A the higher-frequency band. This is because with a single antenna, both receivers would be sharing the transmit signal path, which includes low-pass filters. Suppose VFO A is on 20 meters and VFO B is on 40 meters. Both are subject to the 20 meter low-pass filter, so both will have full sensitivity. Now you want to work a station heard on 40 meters (VFO B/sub). Since you need the 40 meter low-pass filter for transmit, you'd the controlling computer would need to swap VFOs (or you could do this manually by tapping A/B). * * * Notes: - If you had a separate receiving antenna usable on multiple bands, then the low-pass filter constraint goes away; either VFO could be on any band. You'd still need to swap VFOs to transmit on the VFO B band, then swap back. - If you had a K4D, then each receiver would have its own set of bandpass filters, which may be helpful in high-signal conditions. They could also use different antennas. - It may even be possible to run WSJT on the K4 itself, though I can't put a date on this. Some porting required :) 73, Wayne N6KR > On Aug 19, 2019, at 11:06 PM, Logan R Zintsmaster <[email protected]> wrote: > > Here is a use case question.. > > The radio is connected to a single antenna. > > VFO A is tuned to 14.074 MHz and VFO B is tuned to 14.080. > > An audio data stream from the VFO A frequency is "connected" to an instance > of WSJT-X decoding FT8. > > A second, independent audio stream from the VFO B frequency is concurrently > "connected" to a second instance of WSJT-X decoding FT4. > > Both instances of WSJT-X decode their respective audio streams, > concurrently. > > Starting a QSO in either instance of WSJT-X switches the transmitter to the > appropriate VFO for the duration of the QSO. > > The audio stream for the instance of WSJT-X not in the QSO is interrupted > while the transmitter is operating. > > > > Can a K4 support this use case or is a K4D required? > > Can this use case be supported if each instance of WSJT-X is in a different > band? > > > > 73 > > Logan, KE7AZ > > > > > > ______________________________________________________________ > 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]
