[amsat-bb] DopplerPSK

Phil Karn karn at ka9q.net
Wed Jun 19 21:13:57 UTC 2019

On 6/19/19 13:55, Pedro Converso wrote:
> Hello Phil,
> Nice application for SDR !
> You can also use for check these satellites that emit continuous carrier.
> http://amsat.org.ar/pass?satx=lo-19,co-55
> 73, lu7abf, Pedro

Seemed like a natural to me, since radios never tune cleanly.

The question about the satellites is how stable those carriers really
are. Doing this right requires a 2-way coherent Doppler transponder on
the spacecraft. We really should fly one.


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