<< Bill Fisher, W4AN wrote:
>
> I did some reconfiguration on my 80M 4-square this past month and after
> hooking it back up I noticed that I now have a high SWR on the bottom end
> of 80M in the NE position. Yes, high SWR to the Comtek box but only when
> the NE position is selected. All other positions have little to no SWR
> across the entire band. The NE position has 2:1 SWR at 3500Khz and 1:1 SWR
> at 4Mhz.
>
> I have checked everything out today. The relays in the box look fine. The
> measurements at the antennas look mostly OK. The dumped power in to the
> dummy load looks normal in all positions.
>
> I have summarized my investigation at
> http://www.contesting.com/w4an/newpage13.htm
>
> Any ideas would be appreciated. Also any comments on my readings would be
> appreciated.
>>
I have had my 80 meter 4 square up for 4 years and have seen similar problems
on numerous occasions.
Each and every time, the problem has been traced to a broken center conductor
or braid on the feed lines, caused by either wind vibration ov the antennas or
the Llamas stumbling over the feedlines.
For a picture of the solution, check out the web page at
http://members.aol.com/w7nn
73
Ron
HamStuff by W7NN
QSL Systems and Contest Aids
--
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
|