[TenTec] LDG Autotuner

[David Drew]

I noticed the same problem and diagnosed the AT-11 as the culprit on 80 CW 
just as mentioned. The AT-11 has been sitting my shelf ever since. Now 
using TT-253 which is just great..

Dave W7DPW



At 08:22 PM 1/11/01 -0500, Scott Walker wrote:

>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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