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I have an R-2000 and 830S by Kenwood.
Both radios do not receive when plugging in coax connectors into the
S0-239 receptacles. I've eliminated the cables as the problem. I
believe it is possible salt air corrosion internally in both radios.
The signals and noise drop out completely when screwing in the PL-259
connectors all the way in and tightening them down. When they are only
half way plugged in I get normal reception when wiggling the cable but
they are not screwed in completely and not making a good electrical
connection. I lived on the beach and sometimes would open the windows
for ocean breezes. The 830S was right next to the open window and the
R-2000 was sitting on a night table a few feet away from the open
windows. I've eliminated the cables themselves and suspect salt air
corrosion internally in both radios.

If it receives with the PL259 partially plugged in, how can the connector be
shorted? This a classic case of a shorted connector/cable/antenna.

W4OP