[TenTec] Omni VI and power supply occilation???

[Carl Moreschi]

The Paragon, Paragon II, , Omni V, Omni VI, Jupiter, and Orion all have a
circuit that reduces drive if the current in the finals goes above a
threshold.  This circuit not in the original Omni A, Omni D series.  It may
be that the setting for this threshold is too high on Denton's radio.

I am also sheptical of the power supply output voltage being 14.2 volts.  I
think the maximum should be 13.8 volts.

Carl Moreschi N4PY
Franklinton, NC
----- Original Message ----- 
From: "Vic Klein" <vhklein at ptd.net>
To: <tentec at contesting.com>
Sent: Wednesday, April 20, 2005 7:05 AM
Subject: Re: [TenTec] Omni VI and power supply occilation???


> >  ----- Original Message -----
> >  From: denton
> >  To: Discussion of Ten-Tec Equipment
> >  Sent: Saturday, April 09, 2005 11:14
> Not sure about the "oscillation" thing in the power supply, but Ten Tec
> radios do not fold power back under high-SWR conditions and depend on the
> Ten Tec power supply's ability to limit current supplied to the radio in
> order to protect the finals. There may be an oscillation happening in the
> radio that is causing it to to draw excessive current and since your
supply
> is not limited, that may be affecting the finals. Ten Tec used to sell an
> outboard circuit breaker for "foreign" supplies that went between the rig
> and supply to provide the same protection. I'd suggest getting that or an
> equivalent in your setup.
>
> =Vic=
> WA4THR
>
> >  Subject: [TenTec] Omni VI and power supply occilation???
> >
> >
> >  I recently purchased a used Omni VI that quit transmitting, sent it in
to
> > TT
> >  for repair and alingment. TT replaced the finals and some other work...
> >  I recieved the repaired Omni yesterday and wasted no time getting back
on
> >  the air.
> >  This morning....no rf out AGAIN!!! Exact same sympthons as before.
> >  I made a call to the TT repair department, and they said since I run a
> >  homebrew power supply, I may have an ocillation from the power supply
> > that
> >  is destroying the finals in the Omni.
> >  What ocillation??
> >  I have used this power supply for years. It is currently feeding an FT
> > 990
> >  and uhf/vhf radio without problems. The power supply has fed various TT
> > hf
> >  rigs thru the years without problem. Is there something unique about an
> > Omni
> >  that will not allow it to be used in my station on the existing power
> >  supply??
> >  The power supply is currently hooked up to a pair of absorption mat
deep
> >  cycle batteries with a blocking diode between the B+ and the batteries.
> > It
> >  has been used this way for quite some time without problem, and the
power
> >  supply alone is capable of 35 amps continous all day long.
> >  TT also tried to tell me this morning that I may have to run the Omni,
> > when
> >  it gets back from being repaired a second time, on a separate power
> > supply
> >  that will shut down when it detects ocillation.
> >  Anyone run across this before...thanks....
>
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