[TowerTalk] Force 12 C4SXL - Intermittent SWR

[K4SB]

Troublesome question, but perhaps the problem is NOT with the antenna,
but with the 950. If the tuner in the rig had some sort of intermittent
connection or fault, it could very well be that at higher values of
indicated SWR, the rig is the problem, while when using the amp, the
swr is low enough through it to not cause the fault to appear.

Just a guess

73

Ed

Albert C. Burnham wrote:
> 
> Thanks for your response, Paul.
> 
> It IS easy to overlook the obvious; but I should have mentioned that both the SWR meter in my TS950SDX and the external SWR bridge show the same (problem).
> 
> 73,
> 
> Al, K6RIM
> 
> ______________
> 
> At 10:29 PM 6/20/98 -0500, pwentzel wrote:
> >Personally, I always overlook the obvious. Have you tried another swr
> >bridge?
> >
> >73,
> >Paul K0PW
> >-----Original Message-----
> >From: Albert C. Burnham <w4rim@ix.netcom.com>
> >To: towertalk@contesting.com <towertalk@contesting.com>
> >Date: Saturday, June 20, 1998 10:16 PM
> >Subject: [TowerTalk] Force 12 C4SXL - Intermittent SWR
> >
> >
> >>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
> >>
> >>
> >>
> >>\\|//
> >>(@ @)
> >>---------------------oOO---(_)---OOo-------------------------
> >>Albert C. Burnham, K6RIM
> >>409 Summit Drive
> >>Corte Madera, CA 94925
> >>
> >>Phone: (415) 924-6783
> >>FAX: (415) 924-6678
> >>E-mail: w4rim@ix.netcom.com
> >>----------------------------------------------------------------
> >>|__|__|
> >>|| ||
> >>ooO Ooo
> >>-- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions:
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> >
> >
> >
> \\|//
> (@ @)
> ---------------------oOO---(_)---OOo-------------------------
> Albert C. Burnham, K6RIM
> 409 Summit Drive
> Corte Madera, CA 94925
> 
> Phone: (415) 924-6783
> FAX: (415) 924-6678
> E-mail: w4rim@ix.netcom.com
> ----------------------------------------------------------------
> |__|__|
> || ||
> ooO Ooo
> -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm

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