[Milsurplus] GRR-24

[Bruce Stewart]

Hi All,
I was wondering how many have had experience with this single channel UHF 
receiver?  In particular setting it up for  a specific frequency.  My 
understanding is that if you do not have one of the O-1701/GR 
Oscillator-Synthesizer's you need to replace a crystal and align the radio. 
Has anyone done this??  Also, if you have the O-1701, does the unit still 
need to be aligned?
TIA
Bruce