> If the amplifier was then used on SSB driven by a human
> voice, the only time the amp would _not_ be mis-tuned is
> when the human voice peak drove the amp to exactly the
> same level as the peak of the tone used for tun-up.
>
> That seems wacky to me.
No ... with SSB the plate load impedance is dynamic as
opposed to static (a single value) with CW or RTTY. For
SSB or any other amplitude modulated emission, the
calculation of plate load impedance includes the plate
conduction angle and average (dynamic) Ep/Ip ratio.
The tank (flywheel) effect of the output network smoothes
the impedance swings.
With On/Off keying or FSK, Ep/Ip is constant there is no
dynamic variation.
> -----Original Message-----
> From: jerome schatten [mailto:romers@shaw.ca]
> Sent: Saturday, August 29, 2009 9:33 PM
> To: Gudguyham@aol.com; lists@subich.com; sub1@rogerhalstead.com
> Cc: amps@contesting.com
> Subject: Re: [Amps] SB-220 bias question
>
>
> And by extension, consider an amplifier tuned with a steady tone for
> maximum power out when the i/p side of the pi network matches
> the tube
> plate Z and the output of the pi matches the load Z. If the
> amplifier
> was then used on SSB driven by a human voice, the only time the amp
> would _not_ be mis-tuned is when the human voice peak drove
> the amp to
> exactly the same level as the peak of the tone used for tun-up.
>
> That seems wacky to me.
>
> jerome - va7vv
>
> On Sat, 29 Aug 2009 17:56:36 -0700, <Gudguyham@aol.com> wrote:
>
> >
>
> >
> > Fine, but none of those amps change the plate voltage in the
> > different
> > modes, so you mean to tell me they are designed wrong?
> >
>
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