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Re: Fried 3733



Sam:

The 3733 has a standard 3-terminal 12V regulator (7812), which, generally
speaking, protects itself fairly well from reversed voltages. It's easy to
check. Open the case on the side without the TransSystem label. Meter the
input lead -- which should be at least 13.5V, and the output lead, which
should regulate at 12.

My guess is that it's probably ok.

Good luck and 73,
Art N3OY


----- Original Message -----
From: <SamThomasWalker@cs.com>
To: <amsat-bb@AMSAT.Org>
Sent: Thursday, June 14, 2001 8:02 PM
Subject: [amsat-bb] Fried 3733


> Need some info bad.
> Just fired up the 3733 with neg voltage to the striped wire and + on the
> blank black wire ot the Power feed and did not see any sign of any current
on
> milliampmeter. I checked the center conductor of the feed and it showed
neg
> voltage. I assumed that I had a reverse power feed and reversed the feed +
to
> the striped wire and gnd to the solid black wire. I now have current flow.
> The info says that it should be about 160ma but I am drawing about 390 ma.
I
> do hear some noise output on the 2-meter receiver and some of it can be
> directional ( rotating the downconverter by hand). However I am not sure
if I
> have cooked the unit or not as the current is about twice what it should
have
> or better.  Any help woould be grateful. Tom, W4EWB. e-mail
> samthomaswalker@cs.com.
> ----
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