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Pegasus
Try checking the masthead antenna for continuity between the shield and central wire. A friend had the same problem recently and if you get continuity it means it's shorted out somewhere and needs replacing or fixing.
That is not necessarily correct. It depends on the antenna design. Some antennas will measure close to zero ohms DC resistance normally.

Jim
 

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the coax and ant should show 40 to 50 ohms depending on a few things, but should be closer to 50
As k1vsk notes, and I noted earlier: That would be incorrect. In fact: It is unlikely that any properly operating antenna system will measure 50 ohms DC resistance. Most antenna systems will show one of two extremes in measuring DC resistance: An open (infinite) or something darn close to a short (close to zero ohms resistance), if not a dead short.

Jim
 
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