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Thanks to everyone who has responded. I think the conclusion is that at the
frequencies I'm interested in, and the available space inside the radio (a little RS DX-394 table radio), it's impractical to absorb the 455 kHz crosstalk energy from 2nd IF to frontend. Better to attempt to compartmentalize the radio. That may prove to be impractical also as it would appear very difficult to make small (removable) shields over the IF section that would not have gaps. However, I'll examine the pcb layout more closely to see if there are any viable paths for the sides of the shield box. 73, Tom |
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