Laryn,
If the power supply were a switching design, current foldback would occur.
But, in the typical Astron RS-series linear supply, the firing of the SCR
puts a bolted short on the output. As soon as the large capacitors on the
output start to lose their charge, the regulator tries to maintain
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Adam T. Cately
Sent: Friday, December 26, 2008 6:14 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Astron P/S question
At 07:
I think both Mark (the original poster) and I were WAITING for you to jump in
and offer your comments, but you were out-of-service for the last few weeks and
your absense was felt.
So today's questions are (in your experience):
1. Does the supply just fold-back the current if the output is short
do that when something is wrong, so...
>
>Chuck
>WB2EDV
>
>
>
> - Original Message -
> From: william...@aol.com
> To: Repeater-Builder@yahoogroups.com
> Sent: Thursday, December 25, 2008 11:41 PM
> Subject: Re: [Repeater-Builder] Re: Astron P/S question
;To:
>Sent: Wednesday, December 24, 2008 2:32 PM
>Subject: Re: [Repeater-Builder] Re: Astron P/S question
>
>
>>I think they do, but only if the supply is putting out current to the load
>>and the current exceeds the value they've set for it. The crowbar firing
>&
08 11:41 PM
Subject: Re: [Repeater-Builder] Re: Astron P/S question
I have an Astron RM-35M (35Amp) that I just tested by shorting the output and
it doesn't blow the fuse. I think I would be looking for something in the
primary circuit that might be shorting like the transformer prim
I have an Astron RM-35M (35Amp) that I just tested by shorting the output
and it doesn't blow the fuse. I think I would be looking for something in the
primary circuit that might be shorting like the transformer primary or the
surge arrestor or maybe the wiring. I have seen transformers tha
.
Chuck
WB2EDV
- Original Message -
From: "Bob M."
To:
Sent: Wednesday, December 24, 2008 2:32 PM
Subject: Re: [Repeater-Builder] Re: Astron P/S question
>I think they do, but only if the supply is putting out current to the load
>and the current exceeds the value they&#x
ntaneously blow.
Bob M.
==
--- On Wed, 12/24/08, Chuck Kelsey wrote:
> From: Chuck Kelsey
> Subject: Re: [Repeater-Builder] Re: Astron P/S question
> To: Repeater-Builder@yahoogroups.com
> Date: Wednesday, December 24, 2008, 12:59 PM
> I don't disagree with you, but it see
I don't disagree with you, but it seems odd to me. Doesn't Astron use the
current fold-back feature of the 723? If they do, it should just foldback
due to overcurrent. If they don't, well, the fuse is the only salvation.
Chuck
WB2EDV
- Original Message -
From: "wb6fly"
To:
Sent: W
I'm glad you mentioned this. I was thinking the same thing.
Chuck
WB2EDV
- Original Message -
From: "Laryn Lohman"
To:
Sent: Tuesday, December 23, 2008 12:32 PM
Subject: [Repeater-Builder] Re: Astron P/S question
> --- In Repeater-Builder@yahoogroups.com, "Bob M." wrote:
> Whether
OR, Hi, Hi! You could just do what someone did to the Astron RM-50 I recently
rebuild with the help of these guys on the R-P website.
What someone did was to, wire and solder A jumper across the A/C HOT input.
Then to avoid any shutting down, they disconnected the +12 wire to the Crowbar
SCR
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