[AMRadio] RE: Using a Ranger as a driver


Geoff/W5OMR ars.w5omr at gmail.com
Wed Feb 13 12:35:15 EST 2008


Gary Schafer wrote:
> While it is true that for 100% modulation the modulation voltage must be
> equal to the final plate voltage. 

No.  Not equal to, but *twice* as much.  2*Ep

> But it is also misleading to say that it is strictly a function of modulation voltage.
>   

What other voltage is present at the plate (other than the DC supply 
voltage) if not for the AC voltage achieved by the modulator?
High-level plate-modulation, we're talking about.


> The modulation transformer secondary works into a certain load impedance
> (resistance) supplied by the final plate circuit of the RF stage. While it
> is true that the modulation voltage must match the final plate voltage (for
> 100% modulation), 

2*Ep.



-- 
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)

--
73 = Best Regards,
-Geoff/W5OMR



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