[time-nuts] Small quantity custom crystals

Mark Sims holrum at hotmail.com
Sat Oct 2 02:25:30 UTC 2010


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.  
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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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