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
<bold><italic><underline>and</underline></italic></bold> 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>
To: <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:
>towertalk@contesting.com Administrative requests:
>towertalk-REQUEST@contesting.com Problems:
owner-towertalk@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>>
>
>
>
\\|//
(@ @)
---------------------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
|