ect: Re: [Repeater-Builder] Astron Power Supply Failures
>
> So? The power supply manufacturer plainly states 25 amps CONTINUOUS.
> That, in my book means 24/7/365, in which he doesn't have that kind of
> current draw.
> He said the repeater was idle, it keyed up and before th
At 06:30 PM 2/12/2007, you wrote:
> the capacitor and regulator had hundreds of ohms across them.
All the pass transistors test good. No shorts to
ground or from emitter to collector.
The positive terminal of the diodes has 0 ohms to the
negative terminal of the power supply. I'm sure it's
the diodes; the capacitor and regulator had hundreds
of ohms across them.
Bob M.
==
--- Kevin Custer
At 05:23 PM 2/12/2007, you wrote:
'
I'd guess it isn't the diodes, but is one or more Pass Transistors shorted.
<---Either way, I suspect metal migration is involved.
Ken
(remember the promise of unlimited life semiconductors? Now you know
why power devices don't live forever, even if operat
His failure is hardly due to running the supply right at its maximum
continuous rating.
NEXT?
<---I would submit that metal migration within the diodes was a
factor in their failure. (I first heard about this when I worked at
TRW in the 1970's and RF power transistors were still kinda "
At 05:04 PM 2/12/2007, you wrote:
>His failure is hardly due to running the supply right at its maximum
>continuous rating.
>NEXT?
<---I would submit that metal migration within the diodes was a
factor in their failure. (I first heard about this when I worked at
TRW in the 1970's and RF power
So? The power supply manufacturer plainly states 25 amps CONTINUOUS.
That, in my book means 24/7/365, in which he doesn't have that kind of
current draw.
He said the repeater was idle, it keyed up and before the ID went
through, blew up.
His failure is hardly due to running the supply right at
/At 11:06 AM 2/12/2007, you wrote:
>Some of the regular readers may recall I had an RS35M
>(bought new in 2002) blow its diodes in July 2006.
>These were two 35A, 50V bridges made by Diotec. Astron
>only uses the positive half and wires them in
>parallel. I replaced these with Vishay GBPC35
>recti
Well you are running that supply right at maximum rating of 25 amps.
The 35 amp rating is an intermittent one of 5 minutes on 5 minutes off.
73
Gary K4FMX
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Bob M.
> Sent: Mond
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