"Tom Holden" wrote in message
...
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.

Small gaps won't matter as long as they are shorted out at one or both ends.
A well-fitting cover would do that. You'll observe that commercial gear uses
very thin tinned steel? for shield boxes. The lid edges are bent into spring
fingers to hold them in place.