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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