[amsat-bb] FoxTelem Version 1.08z released

[Chris Thompson]

This is a bug fix release for FoxTelem to fix an issue with the IQ decoder
for PSK.  If everything is working for you, then you do not need to
upgrade.  This has been tested for a couple of days but has not had the
long regression testing that we usually do.

I'm releasing it now (quickly) because if you are using the internal SDR in
FoxTelem, in IQ mode, then this is a mandatory upgrade.  It does not work
well with weak signals currently and this fixes that.  It worked fine in
the lab, hi hi.  It should now perform as well as a separate SDR.  I
personally am still getting much better performance from my old FT736R and
others are getting good results with modern radios.  But this raises the
performance of SDR based decodes.

http://amsat.us/FoxTelem/windows/
http://amsat.us/FoxTelem/linux/
http://amsat.us/FoxTelem/mac/

One thing worth considering.  Doppler tracking works better than FindSignal
but you have to be using the latest keps and you need to consider exactly
what the downlink frequency needs to be set to for your situation.  Note
that FoxTelem already offsets by 1.4kHz to put set the center of the PSK
signal in the sideband.  You don't need to offset it.  (You do if you are
using a seperate SDR and feeding the audio to FoxTelem).

If you are running in FindSignal mode (without keps) then the bit SNR level
at the bottom of the window is critical.  For COSTAS it needs to be about
1.5 for Dot Prod it MUST be lower, say 0.5,  Otherwise it will never lock
on.

Yea, lots of settings to get wrong.  Have fun playing.  Please send reports
and let me know how it works for you.

73
Chris
g0kla / ac2cz

-- 
Chris E. Thompson
chrisethompson at gmail.com
g0kla at arrl.net