----- Original Message -----
From: "Jim B." <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, January 21, 2005 1:20 PM
Subject: Re: [Repeater-Builder] Re: Powering the Repeater With Marine
Batteries
>
> edctexas wrote:
>
> >
> > Look on the Kevin's Web site under Astron power supplies for info on
> > how to use an Astron to float batteries. There needs to be a diode
> > between the power supply and the batteries to prevent the batteries
> > from discharging back into the power supply when the AC is gone. You
> > can alos use a BIG relay that drops the PSU when the AC goes off.
>
> The only problem with that is that if the Astron blows, the relay won't
> drop out (since there's still AC), and the batt's won't pick up, so yer
> off the air.
> --
> Jim Barbour
> WD8CHL
>
That's not hard. A very small relay, powered by the supply output, in
series with the coil circuit of the big relay, takes care of that nicely.
Wade - KR7K
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