[Amps] Fwd: Pi-L In-circuit Adjustment Question

[Dennis12Amplify@aol.com]

In a message dated 2/23/05 11:26:25 AM Central Standard Time,  g8gsq at ic24.net 
writes:
 
I don't think there is much difference between a dummy load and antenna,  
that 
wasn't the thought behind my post. In practice there's around 2%  harmonic 
voltage at the output, so the difference might not be entirely  negligible if 
the antenna has a bad match at harmonic  frequencies.
 
*** In that case there should be at least a 2% difference in  measurements 
between the dummy load and the antenna. And I covered that fact  when I 
mentioned that there could be a difference in readings if the antenna was  a highly 
reactive load, which it should be at the harmonic frequencies....
*** Of course if your antenna is the multiband trap type and you are  
broadcasting at 160 and have harmonics at 80, 40, 20 and 10, I guess you could  
efficiently radiate the harmonic energy also. Something I could never  understand 
why someone would want to do.....

I'm going to have to go away and think some more - I'm struggling to  find 
ways 
of putting things into words coherently.

One thought though  - at the plate there's plenty of harmonic voltage/current 
that isn't present  when you probe the tank circuit with the tube cold. The 
dip in total anode  current might not coincide with a purely resistive plate 
load at the  fundamental frequency.
 
*** I guess that's possible, but wouldn't the harmonic energy be an  exact 
multiple of the base frequency?
 
***Regards,
 
***Dennis O.