[AMRadio] RE: Using a Ranger as a driver

John Coleman jc at pctechref.com
Wed Feb 13 12:58:24 EST 2008

I'm sure Gary know that the PTP requirement is 2 EP - he is just using

John, WA5BXO

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Geoff/W5OMR
Sent: Wednesday, February 13, 2008 11:35 AM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] RE: Using a Ranger as a driver

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
> 100% modulation), 


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

73 = Best Regards,

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