Mornin' Richards........
"I get the same sort of results with the SWR on my rig - it seems to show under
3.0 and below OK,or it jumps to >9.9 "
I decided to try a little experiment to see if my SWR indication is as you
stated:
First, I switched off the internal tuner. Then, using an external antenna
tunner feeding a double extended zepp, I intentionaly mistuned the external
tuner to increase the SWR from 1:1 to 1.2, 1.3,1.5......2.0, etc.
Result: You are absolutely correct........my Omni VII behaves in the same
manner. Since I never use my internal Omni VII SWR setting, preferring to leave
the menu position set to PWR, I never noticed that!
Thus, for conversation sake, perhaps the SWR indicator should actually be
referred to as a SWR-null indication. One thing for sure, when the external
antenna tuner indication indicates 1:1, the SWR is nulled out on the Omni VII.
Val / W5PUT
--- On Thu, 12/10/09, Richards <jruing@ameritech.net> wrote:
From: Richards <jruing@ameritech.net>
Subject: Re: [TenTec] Omni VII Query
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Date: Thursday, December 10, 2009, 11:00 PM
I am still kinda new at this ... so it could be operator
error, but I get the same sort of results with the SWR
on my rig - it seems to show under 3.0 and below OK,
or it jumps to >9.9 - and rarely anything in between.
Parenthetically, I have the internal ATU...
And while we are on the topic of performance-vs-stated specs...
When I ordered the ATU, Stan said it would handle a
mismatch of up to 10:1 - but, while I am unable to
test or prove it, an can offer only "anecdotal" or "subjective"
observations (i.e., "feelings") -- comparing it to my two
Palstar tuners (I have the AT-AUTO and the AT2K) it just
"seems" handle only a range of up to 7:1 mismatch.
I understand this is way more than twice the range of a
typical JA internal tuner... not a slur on JA tuners... but
the extra range is what sold it to me in the first place.
Maybe it is performing as warranted, and maybe the
outboard tuners are handling larger ranges... unfortunately
I do not know now to measure or test this ... yet. I am
still learning how to use my antenna analyzer and other
goodies.
Unfortunately, you gotta take my observations with a
whole shaker of salt, because I have yet to quantify the
matter.
Happy trails. ======== K8JHR =======
====================================
Mike Bryce wrote:
> my biggest complaint is the SWR meter is just about useless. if the
> swr on the transmission line varies just a bit off of 2 to 1 then it
> shows 9.9 to 1.
>
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