This crystal is supplied as an aftermarket accessory for XRB SR FM receiver modules that require a 40.665MHz tuning element. It acts as a direct-frequency part to restore or verify the receiver's FM channel when original crystals fail or when a spare is needed for testing.
The part is intended specifically for XRB SR FM receivers; always confirm the crystal footprint and frequency marking on your receiver before attempting installation. Fitting normally involves removal of the old crystal from the receiver PCB and soldering the replacement into the same location. If soldering small RF components is unfamiliar, consult a technician experienced in receiver servicing.
Fitting the correct frequency crystal helps stabilise receiver lock during setup and makes fault finding more straightforward. Perform standard receiver tests to confirm lock and assess antenna performance after swap-out.
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