[AMRadio] AM Radio

[John Coleman]

Idea 1.
When running a Class C rig such as the DX100 there is a specified amount of
grid current (drive) required to make the finals operate in Class C.  They
will not modulate properly if this drive level is not met and the finals
will over heat. Bad idea   

Idea 2.
Reducing the loading for less plate current will cause a mismatch in the
ratio of plate voltage to screen voltage and the screen current will be
high.  Will work to some degree but not the best idea.

Idea 3. Best idea but hard to implement
Lower the final plate supply voltage in some way that the screen voltage
reduces along with it but not he modulator voltage.

John, WA5BXO

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Rick Poole
Sent: Tuesday, January 24, 2012 1:36 PM
To: amradio at mailman.qth.net
Subject: Re: [AMRadio] AM Radio

At 01:53 PM 1/24/2012, rbethman wrote:

 >>>>>
>I simply stated "There is no straight out of the box solution" with
>regard to taking the FULL Apache power output and make the legal limit.
<<<<<

OK, that makes sense.

So, here comes another rookie question:  The DX-100 has a "Drive" 
control that seems to do a pretty good job of directly controlling 
the transmitter output.  So, I tune and load my big hairy-chested 
Brute linear to 1500 watts carrier, then back off the DX-100's 
"Drive" control without touching anything else until the amp output 
is 375 watts.  Then I watch the scope waveform and adjust the audio 
level for 100 percent modulation.  Right?  Seems too easy.  What am I
missing?

Rick WA1RKT

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