All,
ARISSatTLM only uses the 48 kHz sampling rate on soundcards, so
that's the only rate your card needs to be able to run at for ARISSatTLM.
Douglas KA2UPW/5
James McBride wrote:
Randy,
Make sure you have any audio or DSP filters switched off, IF shift to
centre etc. I found the 'tone' control on the FT736 affects the decode
(eventually, by accident).. Also I found that I had a dirty contact on
the soundcard input to my PC's motherboard! After I fixed some of
these things, the decode was okay, mind you I suspect shielded cable
would also be better - I'm using twin speaker lead.. :( . Put the CW
at the marker (as close as possible and adjust for doppler) in USB
mode and you should get some good frames eventually. I've found
usually the high elevation passes are reliable, the low ones at 3-5
degrees just don't give me enough of a chance to get telemetry sometimes.
The soundcard is usually part of the issue also. My old P-4 shuttle
mainboard AC97 codec style soundcard I think only samples at 48KHz or
something and uses software drivers to pretend the sampling is at
other rates - a proper PCI soundblaster style card or high quality SDR
style soundcard would probably work better. At some stage I might try
a better PC but for now it works some of the time straight from the
headphone socket to line-in on the soundcard.
73
James VK6FJA
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