Hi Spence,
I am working the GC since 6 month and I did not find a solution
for that problem so long
So I drive the main vfo by gpredict (via cat) and adjust the
sub-vfo manually by those values gpredict shows in the TX-qrg
window.
I think the FT-847 has no option to adjust sub-vfo in split mode
on the same band.
There are videos on youtube which show hints by using satpc-32.
But you have to trigger rx/tx/rx/tx manually and so you (normally)
miss the reception of your own transmission digipeated by the
satellite.
73, Tom, DJ6TB
Am 01.10.2023 um 23:49 schrieb Spence
M0STO via groups.io:
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Dear group,
? ? ? ? ? ? ? ? ? ? ?Perhaps if I explain a little
background and what I’ve tried it may help to prevent things
I’ve done being repeated.
GreenCube is my problem! Working GreenCube is a nightmare
because of one reason, it’s a satellite and it’s also a
digipeater.
? Every program I’ve tried will happily tune the main VFO
but will not change the sub VFO. PSTrotator, HRD etc. OmniRig
does not seem to like to change the sub VFO while it’s tuning
the main VFO.?
? The FT847 has a major drawback though. In satellite mode
split mode this is achieved easily because the bands are V/U
or U/V uplink and downlink and full duplex but GreenCube sits
on the same frequency (bar Doppler correction). So the radio
will “error” when trying to TX on the same band, that’s common
knowledge.?
? The issue is when in split mode (the only real way to
work GreenCube and Doppler shift), as above, all software
shows the VFO change in software but not on the radio. I’ve
had extensive conversations with Codrut (PSTrotator) and after
many adjustments to his software he can’t manage to get the
sub VFO to alter with the main VFO. The nearest I’ve been to
achieving this was in HRD and setting the Uplink and Downlink
manually but as above only the “main” downlink VFO would
alter.
? I know that some versions of the FT847 had some issues
with asynchronous communications but this wouldn’t affect the
communication when altering the frequency.?
? I plan to inspect the bit data and see if sub-VFO
commands are actually being sent. I’ve successfully sent
manual commands to turn on sat mode, LSB/USB mode, enter
frequencies etc.?
? I wonder if anyone has any thoughts on this?
