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Re: [TenTec] Airpax Breaker Part and Source

To: tentec@contesting.com
Subject: Re: [TenTec] Airpax Breaker Part and Source
From: nl7vl<neal.laugman@gmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 2 Jan 2011 14:31:40 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
> The question is, how fast does a fuse or circuit breaker have to be
> to protect the final transistors?  It may be better to build an
> outboard circuit that duplicates the over-current circuit inside the
> Ten-Tec power supplies.  I've tripped the power supply for my Corsair
> many times without damage.

So what you are getting at is recreating the crowbar circuit to trip
things just like the AC supplies do? (At least that's what the Century
21 does off the top of my head.)


On Sun, 02 Jan 2011 13:05:30 -0500
Bwana Bob <wb2vuf@verizon.net> wrote:

> Well, what prompted this discussion was the fact that I zapped the 
> finals in my Century 22. It was a series of errors. I had left the
> drive set to full power; band was set to 10 MHz, but autotuner was
> set to 3.5 MHz. I accidentally hit the keyer paddle and let loose 3
> or 4 dits, which was enough to kill the finals. The Ten-Tec 979 power
> supply did not trip, probably because a previous owner had used it
> with a different radio and had readjusted the over-current trip
> point. I hadn't bothered to check it.
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