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$6 Downconverter with 435 MHz IF

Has anyone modified the $6 Downconverter (CalAmp 130215) for use on the S
band to work with a 435 MHz IF?

Based on my humble calculations, it would require a 7.6758 MHz crystal.  Am
I on the right track and should this work ok?

Also, I would appreciate any suggestions on web sites that show how to build
S band antennas that would be suitable for handheld operations.

Thanks for any help.

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