One other thing to consider is the location of High Power Commercial
Broadcast stations. Those hand held gadgets are nice, I own both,
but they will go nuts if exposed to high levels of RF.
73, Dick, W1KSZ
On Tue, Jun 23, 2015 at 3:41 PM, Chuck Dietz <w5prchuck@gmail.com> wrote:
> Assuming you safe using the same length of coax to the rig and the
> analyzers, maybe the coax has an imperfection that only shows up at higher
> power? I check coax with opposite e d open (such as gamma match), with a
> digital ohm meter. If you hVe megohms of resistance, you a e bad coax.
>
> Chuck W5PR
>
> On Tuesday, June 23, 2015, Phillip Zminda <phil-z@comcast.net> wrote:
>
> > I installed a 6-BTV vertical about a year ago. It is ground-mounted with
> > about 60 radials and fed with Bury-Flex coax. I felt that the SWR was
> where
> > I needed it. Over the winterI saw a shift in the SWR to the high end of
> > most bands. I suspected that some clamp loosened and a dimension
> changed. I
> > started to re-check dimensions and checked all my coax connections and
> did
> > not see any problems. I began to suspect a trap leaked or got out of
> > adjustment. As I began to try re-tuning I found that when I checked SWR
> > with my AIM-4170 analyzer or an MFJ-259B the SWR showed a the dip at a
> much
> > higher frequency than I see with the SWR meter in my radio (tuner
> > bypassed), a K-3, or on an external SWR bridge. I have to assume the
> radio
> > should be the preferred tool since the rig will fold-back if it doesn’t
> > like the SWR. I have tried calibrating the AIM with standards at the end
> of
> > the coax and have also used a new run of coax.
> >
> > My real concern is the lack of consistency between the analyzers, which
> > are close in readings and the SWR meter at the radio. I have been using
> my
> > Argonaut VI and a separate coax to tune but still having difficulty
> seeing
> > the low point on several bands. I am looking for ideas of what can cause
> > such a discrepancy between the analyzers and RF from the radios
> (typically
> > 5 watts). Any suggestions appreciated.
> >
> > Thanks,
> >
> > Phil N3ZP
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com <javascript:;>
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|