I have the C4XL. I had the same problem on 40 meters only. However, it was a
bit different. During receive my signal would be attenuated. As soon as I
would transmitt especially with the amp, I would get my normal receive signal.
But the signal would go back to being attenuated within a few seconds. It
ended up being a bad connection. Did I
mention I hate PL-259's. Actually, I rushed the job when putting the connector
on. I was too excited and wanted to get the antenna working. As soon as I
replaced the jumper between the feed point and the coax switch I was in
I'm betting you have a bum connection at both feed points.
Hope that helps. You might want to replace the 40 meter coax first as its
easier to get to.
Albert C. Burnham wrote:
> I am having a peculiar problem with the C4SXL:
> When not using my amp, there is an intermittent SWR jump from resonance
> (around 1.3:1) to around 2.5:1. This may or may not be affected by wind; I'm
> not positive. But this problem occurs on all bands covered by the beam,
> including 40 meters. (Actually, the SWR jump is more pronounced on 40 meters;
> when the SWR is high, it is around 5:1 or 6:1).
> But when the amp is turned on, the SWR falls to normal.
> One possibility is bad coax or connectors, I suppose; however, there are TWO
> separate runs of coax to the beam, one for 40 meters, and one for the other
> bands. And, as previously mentioned, this problem occurs on all bands covered
> by the beam.
> I also use a wire antenna, and the problem does not occur on it. The wire
> antenna is wired through the same circuitry as the beam, ie, coax switch,
> amp, low pass filter, SWR bridge, tuner, etc. -- this would seem to eliminate
> internal shack wiring as the cause.
> There is a Force 12 balun for 40 meters, and one for the other bands. I doubt
> that there could be two bad baluns. Also, if a balun were bad, putting more
> power to it would probably make the problem worse, rather than better.
> One obvious solution is to always run the amp.
> But I would like to eliminate the problem.
> Any constructive comments/suggestions will be greatly appreciated.
> With thanks and 73,
> Al, K6RIM
> (@ @)
> Albert C. Burnham, K6RIM
> 409 Summit Drive
> Corte Madera, CA 94925
> Phone: (415) 924-6783
> FAX: (415) 924-6678
> E-mail: email@example.com
> || ||
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