Bob
Astron 35A supplies and probably other sizes are
sensitive to the SCR triggering. One of the
causes I found was due to a shift in the initial
routing from the rectifier to the
capacitors. When you put a supply back together
be sure to give as much space as possible between
the gate
Since I’m the one who started this thread, I think it is incumbent upon me to
let the collective masses know how I am proceeding…
To date, I have added additional filter caps (0.1 µf disc caps) to the SCR
(GATE to GND) and across the output of the supply. I have already affixed
ferrites to
. Seems to be happy to sit that way, but of
course you don't get any output voltage.
Bob M.
==
--- On Mon, 12/22/08, n9wys n9...@ameritech.net wrote:
From: n9wys n9...@ameritech.net
Subject: RE: [Repeater-Builder] Astron P/S question
To: Repeater-Builder@yahoogroups.com
Date: Monday, December
On Mon, 8 Dec 2008, n9wys wrote:
Now - here's the WEIRD part. when I was at the tower with another
tech and replaced the fuse the time before the last failure, we tried
to use his DMM to check the P/S fuse for continuity. His meter acted
as if the battery was dead - but later
Clip the purple wire going to the crowbar.
The crowbar in the Astron is one of the most messed up deals ever.
Astron also makes and auto reset kit for the crowbar.
Or better yet, go find a Mastr II 35 amp supply and be done with it.
Paul,ZW
On Tue, Dec 9, 2008 at 12:33 PM, n9wys [EMAIL
Thanks to all who have offered suggestions - however sarcastic - about
remedying this situation. They all merit consideration, and I will certainly
do so... and will post my results!
73 de Mark - N9WYS
I've had DMMs also go nuts at my site too. Luckily the Astron supply hasn't had
that problem yet.
The fuse usually blows when something catastrophic happens. One such thing is
when the output voltage goes too high and the built-in SCR crowbar fires. It
shorts the supply immediately, and the
Is each individual device that's running off that power supply independently
fused in its A+ lead? If so, and none of those fuses are blowing, that points
back to the crowbar circuit in the power supply. If not, fusing each A+ lead
may help to isolate which device is drawing too much current
@yahoogroups.com
Subject: Re: [Repeater-Builder] Astron P/S question
I've had DMMs also go nuts at my site too. Luckily the Astron supply hasn't had
that problem yet.
The fuse usually blows when something catastrophic happens. One such thing is
when the output voltage goes too high and the built
]
To: Repeater-Builder@yahoogroups.com
Sent: Mon, 8 Dec 2008 10:22 am
Subject: RE: [Repeater-Builder] Astron P/S question
Hi, Bob. Long time, no chat!
The Astron P/S only supplies the PA - all other items in the rack have their
own power supplies, but I can still see where I may have exceeded the MICOR
Will do, Bob. Thanks!
73 de Mark - N9WYS
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Monday, December 08, 2008 12:04 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Astron P/S question
Hi Mark,
Bypass
I had a home built power supply that would
shutdown every time that I transmitted on HF. The
protection system was a little different and
caused the power supply to go into foldback
rather than blow the fuse. It required me to
shutdown the supply to get it going again. The
solution for me
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