Sounds like how my masthead unit slowly died. It became intermittent. Brought it down and it tested fine. Put it back up and it acted up again after a short while. It was just too old. Failure of the wire is possible, but I think less likely. The wire in my mast is inside a narrow conduit. Not much room to "slap around"

Bill Bina



On 5/23/2016 3:14 PM, John Read via CnC-List wrote:
Fred Was getting erratic readings. Sent crew up mast. Removed sending unit and plugged directly to receiving unit
Worked perfectly . Checked continuity from junction box to receive unit
Was perfect. Only part left is masthead wire. Visual inspection of box at top where send unit plugs in looked good Suspect issue with wire inside mast for many years slapping about. I could check it for continuity this weekend. John


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