Scott;
I use the SGC-230 remote auto tuner and have never had any such problems
with my OMNI VI/3. From my own personal experience I have found "antenna
tuners" (I know, I know, wrong terminology) to work great with balanced
antennas and feeders. But when used with either coax or single wire
transmission lines, the tuner needs to be as far away from the shack as
possible. That's one of several reasons that I chose the SGC over LDG and
others (LDG finally has a remote version of their tuner). My antenna is a
200 foot wire with the SGC at the "feed point" which is about 2 feet from my
RF ground system. The SGC is fed with about 30 feet of RG-8 from the Omni
and I have a Radio Works T4G Line Isolator connected to the input of the
SGC. This setup works great with no interference from the SGC, Omni VI/3,
or computer.
Reid, K7YX
-----Original Message-----
From: Scott Walker [mailto:N3SW@worldnet.att.net]
Sent: Thursday, January 11, 2001 5:22 PM
To: tentec@contesting.com
Subject: [TenTec] LDG Autotuner
I find it interesting that TT may be selling the LDG
autotuner, considering the problem I had using it in my
Omni VI station. I built one of them from a kit about
2 years ago. It went together very well and performed
as advertised. However, I noted an increase of QRN when
operating full QSK CW with it. I became very sensitive
to internally generated noise in my shack because of
this, and at first I did not realize it was the
autotuner. I simultaneously had a problem with the Omni
6 "hearing itself" when certain parts of the front-panel
display were active, and TT told me to add a bypass cap
on the low-level board to fix that. There was still
another source of noise, and when I switched back to my
old TT 4229 antenna tuner, that noise
disappeared. I called LDG, and with some discussion they
speculated that I was hearing the processor in the
autotuner between each CW character as the AT-11 sensed
the SWR on the feedline. This was most obvious on
80-meter CW, where I operate daily (NTS nets). The only
solution was to defeat the autotune function entirely
by lifting a diode lead (switching it to manual does not
override the SWR autosensing) making the processor sleep.
I decided this was too much trouble and have stayed with
my old tuner. I made TT aware of this problem. So my
point is, I might be the only guy who had this
problem. I will be interested to hear results as more TT
users try out this autotuner.
73.
**********************************************************************
Scott Walker
New Cumberland, Cumberland County, Pennsylvania USA
E-Mail: N3SW@worldnet.att.net
CW: -. ...-- ... .--
**********************************************************************
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