Sadly, I have the answer. The coax feeding my high 80/40 fan dipoles got
water intrusion at/near the top, and the coax was wet at my grounding
panel, where it entered the shack. I cut the connector to open it up and
found the copper braid to be black in color. I bought new coax, and a
month or two later, replaced it. I also measured the bad coax. When new,
the loss in that coax is 0.4 dB/100 ft at 10 MHz. The wet coax was 0.45
dB/100 ft. Further oxidation of the braid will increase that loss.
73, Jim K9YC
On Tue,3/31/2015 12:52 AM, Markku Oksanen wrote:
All
We had a very rainy fall last year and I noticed a signs of water at an UHF
connector. The cable runs some 150 feet up the tower and and the water must
have been coming along the cable.NOW I have been trying to find definitive
numbers of estimated loss for a wet RG-213 at, say 28.5 MHZ. For some reason,
no luck on the internet anyway. Although I intent to change the cable, I would
like to know what this does for the time being.
Thanks for the help!
MarkkuOH2RA/OG2A/WW1C
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