First check the screw that holds the 15M trap COVERS.
That could detune 15M without affecting 10 and only a
small effect on 20. If one of the 15M coil screw were loose
I would expect to see an intermittent on 20M as well.
On Sat, 3 Aug 2002 (PDT) BILL STRAW <email@example.com> writes:
> I have a 10/15/20 rotatable dipole, actually the
> driven element from an old Cushcraft A3. It has
> worked fine for a long time, but now on 15M the SWR
> is high (3:1) until I apply power, then the SWR comes
> down to (1:1) and the signals sound fine. After a few
> seconds the signals get weak, and applying power
> reveals a high SWR again, which goes back to 1:1 with
> the power having been applied. 10 and 20 are not
> affected. Is this a trap going bad or a poor
> 73, Bill WB0O
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