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Re: [TenTec] Ten-Tec PA design

To: tentec@contesting.com
Subject: Re: [TenTec] Ten-Tec PA design
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Reply-to: geraldj@storm.weather.net,Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 14 Jul 2006 13:34:12 -0500
List-post: <mailto:tentec@contesting.com>
On Fri, 2006-07-14 at 10:45 -0400, Bill Tippett wrote:
> K5KVH wrote:
>  >Add a circuit breaker per the Ten Tec
> supply practice, and you should be fine.
>          I hesitate to bring up the Air-Pax
> debate again, but can anyone explain why
> TT does not use the Air-Pax instead of
> a normal 25A fuse.  Surely not cost in a
> $4k rig like Orion.  I don't mind adding
> an Air-Pax but it causes me to wonder why
> TT did not design it in to begin with?
>                                  73,  Bill  W4ZV
The 25 amp fuse is too insensitive for PA protection. Neither it nor a
25 amp breaker are likely to trip at less than 125% which they should
hold indefinitely, that's 31.25 amps. That's why I use a 15 amp fuse to
protect my Corsair II and it has so far. It seems to be as effective as
the Airpax which I don't have. That 15 amp fuse from a reputable
manufacturer (I use nothing but Buss fuses, no off shore products) seems
to be fast and sensitive enough.

73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer

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