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Roy Lewallen wrote in message ...
Well, 50 feet of RG-58 has about 3/4 dB loss at 14 MHz. And when it's old. . . I've got RG-58 that's well over 20 years old, and can't measure the difference in loss between it and new cable. If it's damaged, it might create an impedance bump, which you might or might not notice. But that's true of larger diameter cable, too. I'm bemused to find that today's hams have somehow gotten convinced they all need BIG cable for a BIG signal. Maybe they've been listening to the same ads that sell people on monster audio cables and SUVs. But I sure hate to see this misleading concept being passed along to newcomers. They'll fall for the ads soon enough without help. Roy Lewallen, W7EL I don't think I've really promoted the cause of excess loss in thin coax, but it is worse than thick cable. By damaged, I mean waterlogged generally. There are not too many other ways to damage it to make it overly lossy. I've seen some old thin coax that was pretty bad as far as loss. Quite noticable on 10m anyway...Maybe not 20m as much. I do prefer larger coax any day of the week, but thats mainly to reduce the losses when I have a fairly large mismatch. IE: warc band use with tuner, etc. Also less loss on higher freq's. In this case, I only mentioned it in case the tuner ends up not being the problem. The coax needs to at least be considered. But I think the tuner is the likely culprit. MK |