[Amps] SB-220 bias question

[Gary Schafer]

When retuning the amp for max power out when reducing drive is NOT a
miss-tuned condition. It is PROPER tuning of the tank circuit for the power
being operated. It is however an increased Q condition of the tank circuit.

73
Gary K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Joe Subich, W4TV
> Sent: Saturday, August 29, 2009 7:49 PM
> To: Gudguyham at aol.com; sub1 at rogerhalstead.com
> Cc: amps at contesting.com
> Subject: Re: [Amps] SB-220 bias question
> 
> 
> 
> > Show me where I said that
> 
> You wrote:
> 
>   > but the AAL-80, AL-82 et al. do not change the plate
>   > voltage on any mode.  The operator is told to adjust
>   > power output according to the mode.
> 
> Reducing the power output without changing the plate voltage
> will result in a miss-tuned condition.  If the pi-network is
> tuned for full output and the drive reduced (power adjusted).
> If the output is retuned and the lower drive level, the plate
> load impedance will be incorrect for the design of the pi-
> network and the pi-network will need to be detuned (run at
> a higher Q).
> 
> Either condition is a miss-tuning of the amplifier.
> 
> 
> 
> > -----Original Message-----
> > From: Gudguyham at aol.com [mailto:Gudguyham at aol.com]
> > Sent: Saturday, August 29, 2009 8:31 PM
> > To: sub1 at rogerhalstead.com; lists at subich.com
> > Cc: amps at contesting.com
> > Subject: Re: [Amps] SB-220 bias question
> >
> >
> >
> >
> > In a message dated 8/29/2009 3:57:01 P.M. Pacific Daylight
> > Time, sub1 at rogerhalstead.com writes: No, I didn't miss the
> > point.  Running an amplifier in
> > > a mis-tuned condition (tune for 1500 W Output and drive
> > > to 800 W Out) If you
> > Show me where I said that
> >
> >
> >
> 
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