Re: [amsat-bb] PSK31 and ECHO questions

["Robert Bruninga" <bruninga@xxxxxxxx>]

>>> "Mark L. Hammond" <mlhammond@charter.net> 9/7/04 6:20:44 PM >>>
> how Echo will receive USB signals and translate that 
>into an FM signal for us on the earth end to decode.

Just like your SSB receiver does.  Multiple PSK-31 sigs
in, a single audio channel out.   In this case, the 
audio is transmitted to the ground on an FM signal
so you can hear them all in the 3 KHz passband.

Its beautiful because everyone sees the same waterfall
and can adjust to be where they want to be and stay
there..

I wrote a paper a few years ago for the AMSAT
symposium back when we proposed the idea...
I think I have a web page on it too....

http://web.usna.navy.mil/~bruninga/psk31uplink.html

de WB4APR, Bob
----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org