[AMPS] Peak reading vs True peak

[Peter Chadwick]

Rich says:

>?  The gain of a SB-220 is about 9.5db on the low v tap, and about 11db 
>on the high v tap.  

At what power output?

73

Peter G3RZP


> ----------
> From: 	Rich Measures[SMTP:measures@vc.net]
> Sent: 	25 June 1999 10:47
> To: 	'amps' 	
> Subject: 	RE: [AMPS] Peak reading vs True peak 
> 
> 
> 
> 
> >
> >Tom says:
> >
> >>You are viewing short term fractional cycle behavior and trying to 
> >>use it to explain long term averaged current and power.
> >
> >Yes. Just like Chaffee analysis does.
> >
> ?  [chortle]
> 
> >But the original point was that the gain goes down. My argument is that
> the
> >power output goes down, but the 'gain' is marginally affected. So what we
> >see is gain compression; a linear amplifier has constant gain over the
> full
> >input power envelope. If gain is affected, then running a kW amplifier at
> 10
> >watts out would see just as much percentage drop in output when the
> plate
> >volts is reduced as at a kW. In other words, that would say that gm is
> >highly dependent on plate volts. But look at curves for a tetrode, and it
> >ain't so. Even with a triode, the mu doesn't change that much for the
> plate
> >voltage changes we are talking about.
> >
> ?  The gain of a SB-220 is about 9.5db on the low v tap, and about 11db 
> on the high v tap.  
> >........
> 
> 
> Rich...
> 
> R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  
> 
> 
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