[AMRadio] AM Amps


Gary Blau gblau at w3am.com
Tue Jan 11 00:21:12 EST 2005


Although both of these will serve to reduce the drive power and get you
on the air, they are less than optimal.

The problem with reducing the B+ is the max PEP goes with it.  You'll
want to preserve that for positive modulation peaks.  As Gary Schafer
sez you want to keep the driver PEP up to where the amp needs it for
full output, as long as the plate dissipation is not exceeded during
dead carrier.  Better to keep the plate hi and pull back the screen V.  

A simple attenuator wastes heat, may be difficult to adjust over a wide
range, and offers no improvement in modulation performance over the
stock exciter running at full power, (limited positive peak
capability).  But, a better idea than lowering the B+.  

g


Geoff wrote:
> 
>...Reducing the B+ level on the plate of the 6146 is another way.
 
>...A "T" connector, and a dummy load works well, also.
> 
> Just tossing out some more ideas.




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