The hairpin is a good place to start. The weak point is the ring terminals
used to attach the coil to the feed point bolts. I found the hairpin coil
laying near the base of my tower. The winds here finally one.
I used heavier ring terminals during the repair, so far so good.
Rich - N5ZC
Sent from my iPhone
> On Sep 16, 2019, at 11:58 AM, Ed Sawyer <sawyered@earthlink.net> wrote:
>
> To be clear, just because the SWR gets better lower in frequency (to a 50
> Ohm input) doesn't mean something has lengthened. It just means that a
> frequency dependent impedance has shifted lower in frequency to give the
> desired match.
>
>
>
> My guess is that the hairpin coil has started to rust and has added
> resistance but is still connected. You could test that theory a bit by
> putting a carrier on it for 30 seconds and see if the SWR moves. Or the
> balun could have a similar defect.
>
>
>
> As KK9A said, if the loading wires disconnected or the hairpin disconnected,
> the response would be typically a higher shift rather than lower.
>
>
>
> Ed N1UR
>
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