[amsat-bb] SDR's for satellite work, was: ===> Re: Yaesu FT-857D
erich.eichmann at t-online.de
Sun Jan 24 07:29:48 UTC 2016
"The only drawback to the solution was having to swap coax lines between
2m and 70cm. "
SatPC32 can optionally control a coax antenna switch (called "transfer
switch" as far as I know) that swaps the 2m/70cm antennas between the
radios when you switch between v/u and u/v satellites. The DTR pin of
the Radio 2 serial port can be used to either feed a CAT interface or to
steer the antenna switch (selectable in menu "Options"). Mike, W4UOO,
suggested such feature and I added it a few months ago.
The feature requires a 1-transistor buffer between the DTR pin and the
coax relais. There is an example on my website www.dk1tb.de/AntSwitchIF.jpg
73s, Erich, DK1TB
Am 23.01.2016 um 03:37 schrieb Clayton W5PFG:
> I know you specifically said you prefer Linux, but the solution which
> brought me the most success was HDSDR+SatPC32. The two applications
> talk together well via CAT and a pair of virtual serial ports. This
> gives you full Doppler shift adjustment by computer control.
> My FT-857D was configured as a radio in SatPC32. The FCDP+ was
> configured as the other radio in SatPC32.
> If you moved the dial on the radio, there was full, tracking feedback
> to SatPC32 and HDSDR. If you tuned on the HDSDR, it adjusted the
> radio as well.
> I made several hundred contacts on all the available satellites during
> the time I was playing with this in the shack.
> The only drawback to the solution was having to swap coax lines
> between 2m and 70cm.
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