[Boatanchors] Beam antenna question
anchor at ec.rr.com
Sat Feb 18 20:24:03 EST 2012
Does this beam have separate traps for each band, or "one does all"
like Mosely? Anyhow, maybe spiders in a 15m trap if they're separate.
I've had that problem. Probably not corrosion at the traps-element
connx, haven't heard of that much, if at all.
"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole
On 2/18/2012 5:11 PM, RAY FRIESS wrote:
> Need some advice from the fellow old timers here ... or even the wise newcomers...
> I have a HyGain beam antenna, the Explorer 14. Fairly old, but has been a great performer with nearly unity SWR from one end of the band the other on 10, 15 and 20 ..
> until recently.
> Now, a few weeks ago the SWR on 15 shot up so high that it nearly pins the SWR meter. However, the SWR on 20 and 10 are still less than
> 1 to 1 and it continues to load fine. Barely moves the needle on the SWR meter.
> My question is, what should I suspect? A 15 meter trap gone bad, or maybe corrosion in the area where the traps and elements are clamped together?
> The antenna has been up for about five or six years now, without any trouble prior to now. Sometimes there would be brief periods of a few hours with a
> high SWR such as when we had snow accumulate on it, but when it dried up, the SWR came back down to normal.
> I thought if it was either a bad trap or a corroded element to trap joint that the SWR would be all out of kilter on all three bands, not just 15 meters.
> I'm sure it's something with the antenna. I use a TS-50 solid state rig with the automatic antenna tuner. It still loads and puts out full power on 20 and 10,
> but on 15 because the SWR is so high, the power dips down to about 5 watts output on the beam. I can load a regular dipole without problems.
> I tried taking the auto tuner out of line to see if it was having a problem on 15, but I still get the same high SWR without it in line.
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