Model Forum / Radio Controlled / Air Models / May 2004

Yes there are differences between the crystals used by various
manufacturers.

The modulation scheme has nothing to do with which crystal is used, so
in that respect PCM, FM, or AM modulation are independent of the
crystal.

There are several circuit design parameters that dictate which crystal
type must be used, and the specific frequency is _not_ the deciding
factor.

The only way you can determine whether a brand "X" crystal will work
in a brand "Y" receiver is trial and error, with emphasis on the error
part.

The receiver may be damaged by the foreign brand crystal and never
work again, or the receiver may not be damaged but may not operate, or
the receiver may operate poorly, or the receiver may operate with no
noticeable ill effects to the extent that a range check yields the
same results as with the correct brand crystal.

Generally speaking, using a brand "X" quartz in a brand "Y" receiver
is about as predictable as roulette.

I dunno 'bout you, but my models cost a great deal more than a
receiver crystal and I'm not taking any chances on the radio system.