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Poor connection at either of the coax connectors, or the USB power port.
The center conductor or the shield connection at the coax ports could be bad.
I test the female coax connectors with a piece of 18 gauge (the same as the coax center conductor) bare solid copper wire to be sure it grabs it securely.
Last edited by rabbit73; 28-Feb-2017 at 1:53 AM.
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