Hi Paul!

What do you use?

73

Neal Campbell
Abroham Neal LLC




On Thu, Jun 12, 2014 at 9:37 AM, Paul <[email protected]> wrote:

> There is an over voltage protection circuit on the output circuit in the
> RM-35 but it usually blows out, protecting the fuse on the input to the
> supply and destroying the attached radio.
>
> I cannot understand why Astron has such a good reputation with such a poor
> design.
>
> Paul, W8AEF
>
> -----Original Message----- From: Ray, K9DUR
> Sent: Thursday, June 12, 2014 4:25 AM
> To: 'Dudley Hurry' ; 'Dave Movius'
>
> Cc: [email protected]
> Subject: Re: [Flexradio] Power Supply Advice
>
> Dudley,
>
> I agree.  Our club had an Astron RM-35 that had the series pass transistor
> fail (short).  The output voltage went to the maximum provided by the
> transformer & the 2 rigs connected to it were damaged.  The Yaesu FT-950
> was
> repairable, but a Yaesu FM rig was not economical to repair.
>
> A problem with linear supplies is that if the series transistor fails, the
> result is a serious over-voltage situation.
>
> 73, Ray, K9DUR
> http://k9dur.info
>
>
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