Other than being able to monitor two different bands (or two different
sections on the same band) I'm not sure what the benefit here is, but I
wonder if I could accomplish the same thing with my K3.
1. Run two instances of WSJT-X
2. Use two different USB sound card dongles, each port assigned to one
of the WSJT-X instances
3. Use left ear/right ear audio output from the two K3 VFOs, left ear
to one USB sound card and right ear to the other
4. Use "Fake it" instead of "Rig" split control
I don't see that there's any gain in contact efficiency here, though.
The transmissions for two different QSOs would have to alternate, and
the odds of getting out of sync with the guy on the other end would be
significant. If you were actually making a lot contacts from both VFOs
this way you'd be disrupting a lot of sequences, and if everyone else
was doing this it would be total chaos.
So I'll ask again ... what am I missing here?
73,
Dave AB7E
On 8/20/2019 8:27 AM, Wayne Burdick wrote:
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
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