Thanks Gordon and others. Is there any SDR software that supports the FCDP and will demod FM properly for 9.6K FSK ?
Dave -----Original Message----- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Gordon JC Pearce Sent: Friday, November 22, 2013 2:36 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: Dumb question 9600 FSK On Thu, Nov 21, 2013 at 03:45:04PM -0700, David W0DHB wrote: > > What mode should your RX be in to receive the 9600 baud FSK telemetry > downlink signals. USB, FM ?? It should be FM, and you must pick up the signal from before the audio filter. You're looking for "flat unsquelched" in Motorola parlance ;-) 9600bps FSK is generated by modulating the carrier frequency with the digital bitstream directly, after passing it through a filter to round the corners off so it doesn't splatter. As such, the frequency response needs to be flat from DC to whatever the passband of the IF filter is. -- Gordonjcp MM0YEQ _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
