Nope, nothing special about the stability requirements. Hopefully the freq
won't drift off channel (receivers are usually fixed freq or channeled at
10-50KHz with a VFO tweaker cap to allow some offset adjustment within the
channel). They are usually highly optimized for sensitivity (< 0.1uV) and
bandpass.
I did some playing with some computer crystals in the 50 MHz range and could
get the circuit to work properly with them, so the crystal does not need to be
a 5th overtone.
-------------
This is comparable, then, to the wildlife transmitters for Argos (which are at
400MHz-ish).. Does this application need good medium term stability (i.e. are
you making a series of Doppler measurements?)
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