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Default Changing Shure wireless microphone frequency

Shure wireless handheld microphone. Spec can be found here if it can be of any help
http://www.shure.com/pdf/discontinued/L-Series.pdf

Microphone transmit at 180.4MHZ. It was made in 1990. It uses a 20.05MHZ crystal by MTRON
as far as I can tell like the one uses in Radio Control car, but about half the size. Can the
frequency be changed to something like 218.5MHZ by just changing the crystal?
If so, what frequency should I use?

Thanks for any info you can give.


 
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