At 03:59 PM 3/9/05, you wrote:

> >  As for energy efficiency I've never seen a modified mobile
> >that would operate at 20 watts with just a few amps input.
>
>Unless you have seen my Micor conversion that will do 17 watts with just
>two final stages...  The whole repeater including controller, preamp,
>etc. running 17 watts draws a little over 3 amperes at 13.8 volts DC.
>Yes, there is a switch in the B+ line for the audio PA, and yes, at this
>current draw it is turned off.

The standard trick is to replace the volume control with one that
has a switch, and use that switch to control the power to the
audio PA.

This technique works on both Micor and Mastr-II repeaters,
either mobile based or station based.

>Pictures of a similar PA are here:
>http://www.shol.com/kuggie/ahra/hmftinfo.html
>
>Kevin





 
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