[Boatanchors] Tuning Capacitor Air Gap Information

[Brian A Clarke]

Hi Guillermo,

I hear your re-assertion of the original claim.
I was hoping to see some real mathematical proof.

What many seem to think is that adding 100% modulation
doubles the plate voltage. But in reality, that would give
massive carrier shift. 100% AM plate modulation occurs
when you apply 50% of your carrier power via high-level
modulation. This should give an average dc level shift of
sq rt 1.5 x non-modulated plate voltage. I make that
+22% - not +100%.

73 de Brian, VK2GCE

----- Original Message ----- 
From: "GGLL" <nagato at arnet.com.ar>
To: <brianclarke01 at optusnet.com.au>
Sent: Wednesday, October 10, 2007 9:00 AM
Subject: Re: [Boatanchors] Tuning Capacitor Air Gap Information


> If you have lets say, 500 VDC plate voltage applied to a class C output
> stage anode, the RF output swing maximum is twice that value
> (disregarding Epmin data for the tube). This for the carrier signal.
> When you high level modulate this stage, you also apply (add) a voltage
> to reach 100% modulation, and to accomplish this the RF carrier is
> modulated up and down via the audio signal, from zero to nearly twice
> this value. This way you end up with 2000V at the peak of the modulated
> carrier.
>
> Best regards
> Guillermo - LU8EYW.
>
> brianclarke01 at optusnet.com.au escribió:
> > I would like to see the math proof that the voltage on the anodes goes
to 4x the DC voltage.
> > 73 de Brian, VK2GCE.