Was wondering about these two radios (TR-7 and R-4C) and if their 5.645 IF filters could be interchanged?
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1. What is the input and output impedance's of the TR-7 5.645 IF filter version?
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2. What is the input and output impedance's of the R-4C 5.645 IF filter version?
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3. Is the R-4C version 1000 ohms input and output for its first IF filter of 5.645?
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If their impedance's are different maybe impedance matching could be incorporated so the TR-7 filters could work in the R-4C?
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What do you think?
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Chuck
