----- Original Message -----
From: <tritoniv@sbcglobal.net>
To: <kg6tt@arrl.net>; "Discussion of Ten-Tec Equipment"
<tentec@contesting.com>
Sent: Friday, December 22, 2006 6:27 PM
Subject: Re: [TenTec] Three final Ten-Tec Triton IV mods & info
docsavailable
> Jerry:
> We just have to quit meeting like this. I feel you are a family member.
> You
> have all of this good info for the Triton. Just for info, I bought a
> Triton,
> PS, from a hamfest. //hack//
___________________________________________________
Merry Christmas Ralph and all.
Here's an old message about the Triton power supplies -- the ones with a
single pass transistor on the heat sink:
"Be really careful with that 252 power supply. As originally made, they
have
no crowbar circuitry. Thus if the pass transistor shorts, the supply will
put 25 volts into the rig -- somewhat shortening the rig's life. Ten-Tec,
realizing the oversight, later sold an "Over Voltage Protection" circuit
board, an OVP they called. It was a small board, perhaps one by two inches
and had an SCR, a zener diode and a fuse. It mounted inside the rear panel
of the supply. I suggest you check there and see if it is present. When
installed, the large red wire to the supply's output comes from that small
circuit board. The OVP is no longer available from Ten-Tec but someone can
surely send you the schematic."
But then Ariel came to the rescue with info on a new device that seems
designed to be a self-contained crowbar. I'll paste his email below.
73, Mike N4NT
__________________________________________________
From: "Ariel M. Elam" <k4aal@comcast.net>
Reply-to: k4aal@comcast.net,Discussion of Ten-Tec Equipment
<tentec@contesting.com>
Date: Wed, 22 Feb 2006 23:32:33 -0600
List-post: <mailto:tentec@contesting.com>
Here is a method for providing a quick and easy crowbar.Place a Diodes
Incorporated 1.5KE15A (NTE4920) across the power output AFTER the fuses
ans before the rig. Band goes to +. It will clamp 1.5kW, about 100
amps@15 volts and blow the fuse.
I found this in "73 Amateur Radio Today", May 2002, page 38. Title "An
Ounce Of"
I have installed this on my rigs, but it has never been needed to
prevent a problem.
73,
Ariel, k4aal
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