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

[denton]

ok see privous reply....I just sent it off...
also the Omni, Ft 990 and uhf/vhf rigs are always attached to the battery 
output..with a fused B+
TT gave me indication this morning that their power supply shut down 
automatically when sensing ocillation...wonder if we are on the same 
wavelength here...

----- Original Message ----- 
From: "J. Reed" <jhreed at chilitech.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Tuesday, April 19, 2005 8:51 AM
Subject: Re: [TenTec] Omni VI and power supply occilation???


> Good morning once more Denton,  my inquiring mind
> is starting to focus on your 'supply' which is starting
> to sound like a non-filtered charger, hitting the
> batteries at 35+ amps on positive peaks of about 20+ volts
> every 120th of a second.  The Omni can't take that
> (in my opinion) too long.  Also, at the initial start
> in the morning, it's posssible that there's a light
> coating of hydrogen bubbles on the plates of the
> batteries and for a fraction of a moment, the spikes
> go straight to the Omni.  To test this idea, put your
> scope on the batteries (without the OMNI connected),
> and check for pulses... IF you don't have a scope,
> take your AC voltmeter and set it for about 20 vac
> and see just what the indicated AC reading is.
> Remember, the 1.414 x AC value will give you the peak
> value that might be causing you grief...  just some thoughts,
>  ----- Original Message ----- 
>  From: denton
>  To: Discussion of Ten-Tec Equipment
>  Sent: Saturday, April 09, 2005 11:14
>  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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