idk the movie described in this thread sounds different.
There is a Cold War thriller, which for the life of me I can’t remember the name…. Anyways, about a radar station north of the Arctic Circle, probably the DEW line, in the dead of the winter.
Classic plot: a bad guy, presumably a Soviet operative, thrashes the station, including the only short wave radio. Left several dead operators but our hero somehow survives.
Our hero finds a damaged resistor on the radio, and proceeded to fix it with the graphite from a #2 pencil.