[Elecraft] Strange SWR change on 20 at

[Dave Cole]

Hmmm...  I am having the exact same issue...  My SWR changes after a few 
transmissions, then returns...  Up until now, I have been suspecting my 
antenna...  Time to add an external SWR bridge between the tuner and 
antenna as a permanent thing...

73s and thanks,
Dave
NK7Z
http://www.nk7z.net

On 05/13/2017 09:07 AM, Terry Brown wrote:
> I recently started using my horizontal loop that is about a full wavelength
> on 80, for 20 meters.  I took down my yagi as we are moving; drat!  My
> Horizontal Loop is at 40 ft.  height and fed with 450 window line into a 4:1
> voltage balun with about 15 ft. of coax to rig.
>
>
>
> I am running 100 watts through my KXPA100.  I tune a frequency in the CW
> portion of 20 to about 1.2 :1 and start sending CQ.  After about 3 to 4  3x3
> CQ's,, the SWR goes off the charts and power drops to zero.   I can retune
> the antenna and the process repeats itself.  20 meters is the only band
> affected.
>
>
>
> I am wondering if I am having RF problems in that part of the 20 meter bands
> This only occurs on 20 meters.  The Amp is grounded, but the KX3 is not
> bonded to the Amp.
>
>
>
> I would appreciate any advice.
>
>
>
> Thanks and 73's,
>
>
>
> Terry de N7TB
>
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