[TenTec] emergency back up power

[Gary Hoffman]

Modern sine wave inverters of the sort sold for solar power systems are far
above 90% efficient.  I don't know about the linear power supply
specifically used by Ten Tec, but I have never seen any properly designed
supply that was as poor as that.  My feeling is that this information is
considerably out of date.

73 de Gary, AA2IZ


----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at storm.weather.net>
To: <tentec at contesting.com>
Sent: Monday, March 05, 2007 7:49 PM
Subject: Re: [TenTec] emergency back up power


> On Mon, 2007-03-05 at 17:21 -0500, Gary Hoffman wrote:
> > I'll bet that the battery voltage, as delivered to the actual radio, is
a
> > little low.
> >
> > Going to a sine converter and 115 VAC power fixes this issue totally.
>
> At a cost of anywhere up to 50% of the battery's power from the
> inefficiency of the inverter and the linear Tentec power supply.
> Sometimes it is more effective in the long run to let the radio struggle
> with 12 volts and to run 25 watts and to run for many hours than to run
> high power inefficiently for a few minutes. Then it helps to select the
> radio that will run from the battery that isn't being charged.
>
> >
> > Gary
>
> -- 
> 73, Jerry, K0CQ,
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
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