[TenTec] Omni VII Query

[Val Erwin]

Ron:
 
Not to worry...........the rig was seeing 50 ohms but only when I had the external tuner tuned to indicated so. I had my sensor mounted directly at the output of the Omni VII. The sensor is a part of the NYE RFM-003Power Monitor. 
 
Obviously, I was merely using the antenna tuner to intentionally introduce a small mismatch back into the Omni VII.............dats' all......
 
Bottom line is that the Omni VII SWR indicator is a relative indicator only..........probably the same when the menu is reset from SWR to Power....Of course, my original posting had NADA to do with the SWR reading but actual measured RF power output from the Omni VII with both multiple Birds/oscilloscope......85 watts.
 
Val a.k.a. W5PUT

--- On Fri, 12/11/09, Ron Zond <k3miy at csonline.net> wrote:


From: Ron Zond <k3miy at csonline.net>
Subject: Re: [TenTec] Omni VII Query
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Date: Friday, December 11, 2009, 9:05 PM


Val
Did you try different lengths of coax on the rig.
Sometimes that will help by moving the 50 point to the rig output circuit.
(The rig actually "sees" 50 ohms.

Ron
K3MIY

-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of Val Erwin
Sent: Friday, December 11, 2009 11:17 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Omni VII Query


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 at ameritech.net> wrote:


From: Richards <jruing at ameritech.net>
Subject: Re: [TenTec] Omni VII Query
To: "Discussion of Ten-Tec Equipment" <tentec at 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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