[amsat-bb] Re: FM receiver filters

Bob Bruninga bruninga at usna.edu
Wed Dec 31 07:23:57 PST 2008

>> We did that on the uplink receivers 
>> for PCSAT-1 and -2 ... to make the 
>> receiver about 30 KHz wide. 
> Yes, this is a similar venture. 
> We did buy a Hamtronics RX ... but 
> decided we could reduce the size 
> significantly.

Yes, its size is very wasteful.  But we were surprised that we could hack-saw off one edge of the board and make it fit inside a 4" cubesat and only have to move the first coil a little bit.  Though we have since found a smaller receiver, though not crystal controlled...

Even with the hamtronics and modern APRS pic processors, we could easily fit a full 5 Watt APRS digipeater into HALF of a cubesat, leaving the other half for other experiments.

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