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Author Topic: 9.4 kHz Mechanical filter for 51J-4  (Read 2939 times)
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Steve - K4HX
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« on: August 15, 2020, 12:08:19 PM »
Some adapting, connection work will need to be done to connect to the J-4 socket. I have one (in a case that fits the J-4 filter sockets) in my 51J-4. Great for enhanced fidelity AM reception.

https://forums.qrz.com/index.php?threads/collins-500khz-mech-filters.719572/
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