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Great! This PSK31 TX-only software for PSAT PSK-31 solves three problems! 1) as a separate TX-only program, it lets everyone run FULL DUPLEX with their existing PSK31 for receive 2) It makes your signal constant in the waterfall for You 3) and for everyone else even if they are not running anything special!
Maybe Andrew can comment on whether two separate sound cards are needed or if it is possible to use a single sound card?
Bob, WB4aPR
-----Original Message----- From: [email protected] Sent: Wednesday, July 15, 2015 6:41 PM To: [email protected] Subject: [amsat-bb] PSAT PSK31 experimental software
I put together an experimental program called DopplerPSK to compensate for the Doppler shift on the NO-84 (or NO-83) PSK31 uplink. In essence, its a PSK31 transmitter that is merged with an orbital propagator to cause your transmitted signal to drift exactly opposite to uplink Doppler effect. It does this in a phase-continuous correction so that you don't get errors due to discontinuous frequency adjustments from controlling a radio in discrete steps. In the case of PSAT and BricSat, it should cause your signal to stay at constant frequency in the satellite's uplink receiver, and thus you should get a stable frequency on the FM downlink as well. In turn, this means you should be able to use your favorite PSK31 demodulating software to copy the downlink since the frequency drift should stay well within the AFC tolerance of the software. Anyway, if there are any adventurous people who are set up to give this a go, I would be interested in seeing if it actually works. You can find a rough quick-start guide (which contains an explanation of how it works and what you need to get started) and the application package on the rather minimalist page here: http://www.frontiernet.net/~aflowers/dopplerpsk/dopplerpsk.html It's an experiment, so be prepared for disappointment. I am :-) Andy K0SM/2 _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb