It's Ok to change crystals in a RX, and it will probably not need re-tuning, BUT always do a range check first! If the tuning is "off" it will be only your sailplane that will be effected!
The only time you can't change crystals in our receivers is when you are changing bands. i.e. shoving a 50 MHz crystal into a 72 MHz receiver or vice versa doesn't work.
In fact, just changing the crystal without having the TX re-tuned by a FCC licensed person is against FCC rules! That's what frequency modules are for--they include the specific frequency critical tuning so changing them (the entire module) is OK!
Assuming you are under the auspices of the FCC :)
In Canada, R/C falls into an unlicensed low power (under 1 watt) category with the rule basically being anything goes as long as you don't interfere with any licensed user. Pretty sensible IMHO. Canada hasn't issued new licenses in the R/C bands in years either.
2. Choose a new channel/frequency that's as close to the "original channel"
as possible.
Personally, I don't stray more than 5 channels above and below the original frequency. This gives me use of 22% of the band.
-- Andrew E. Mileski Ottawa, Canada http://isoar.ca/
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