Alternatively, one might use a "UPS" that transferred only
when power was off (technically a standby power supply). The
"alarm" output could then be used to interrupt the PTT line to
the amplifier so the amp would drop to standby if mains were
to drop.
Of course the UPS would need to be capable of 240 volts - not
the typical 120 volt computer UPS here in the US.
73,
... Joe, W4TV
> -----Original Message-----
> From: amps-bounces@contesting.com
> [mailto:amps-bounces@contesting.com] On Behalf Of David Cutter
> Sent: Monday, July 16, 2007 1:15 PM
> To: Roger; Jim Brown; amps@contesting.com
> Subject: Re: [Amps] ALPHAs and momentary power outages
>
>
> Strictly speaking you only need the UPS for the heaters,
> since your rigs and
> everything else are off. This means supplying a separate
> transformer just
> for the heaters which might be practicable from the same UPS
> as your pc.
> These are relatively cheap these days.
>
> David
> G3UNA
>
>
> ----- Original Message -----
> From: "Roger" <sub1@rogerhalstead.com>
> To: "Jim Brown" <jim@audiosystemsgroup.com>; <amps@contesting.com>
> Sent: Monday, July 16, 2007 5:49 PM
> Subject: Re: [Amps] ALPHAs and momentary power outages
>
>
> > Yes, a proper sized UPS would work, but it has to be
> capable of supplying
> > the peak AC power to the amp under load if that is when the power is
> > interrupted rather than just the idle power. That means a
> UPS capable of
> > 2500 to 3000 watts peak and would probably cost as much as
> the Alpha.
> > Those
> > in the neighborhood of a KW seem to run about a dollar a
> watt. I'd guess
> > they get more expensive per watt much larger than that as I
> just looked at
> > a
> > 1200 watt unit for $1,400.
> >
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