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That is the best part about the NE602. It has both a mixer and osc in a 8 pin package. Proabbly today you can get it as surface mount. Simply hang a xtal with a small adjustable cap off of it. Feed the antenna in and feed its output to the RX-2 if that is what is under the epox goo.
Would pick up a signal +- but better than the regenative receiver it has now. And with a bit of luck allow you to change freq.
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