Amps
[Top] [All Lists]

SV: [AMPS] More and More and More and More - drive derived screen potent

To: <amps@contesting.com>
Subject: SV: [AMPS] More and More and More and More - drive derived screen potential
From: measures@vcnet.com (measures)
Date: Tue, 21 Dec 1999 03:11:15 -0700
>
>Lars Harlin wrote:
>>
>>AG6K:
>>> ?  not according to DAF recommendations. 
>>
>>SM3BDZ:
>>And exactly WHAT is the DAF recommendations??
>>
>Only what G2DAF himself wrote (copy posted on my web site). All the rest
>has come from other people, and G2DAF is not around to pass comment.
>
>Actually, that's probably just as well for some people, because G2DAF
>was a totally ruthless critic of SSB signal quality. 

?  It would have been my guess that DAF would be on a submission and 
domination trip.  

> Anyone who checked
>into his 80m SSB Experimenters net "for a signal report" could expect no 
mercy!
>
?  The only was I know to deal with S&D freaks is to be very certain of 
your stuff beforehand, do not partake of puerile insults of any kind 
whatsoever, and never, Ever become angry.  Remember that in a debate, 
everyone who chooses the Insult Card looses.  
>
>....... Because the gain depends on
>the 3/2 power of the screen voltage, as Rich said, the transfer
>characteristic of the G2DAF-type amplifier cannot be a straight line. It
>has to be S-shaped - starting with low gain at low signal levels (and
>therefore low screen voltage), increasing for medium levels, and then
>flattening off like any amplifier does if over-driven.

?  well put
>
>This might explain why the two-tone results from DAF-type amps can look
>reasonable at high (but not excessive) drive levels. At lower drive
>levels, the IMD relative to the output level could be significantly
>worse. An oscilloscope pattern of the two-tone signal would presumably
>show significant "pinching" of the crossovers as the gain drops... but
>the output level is lower, so maybe it matters less? What this means for
>a real-life speech signal is hard to guess.
>
?  -20 to -23 db is apparently a pretty good guess.  

cheers, Ian.  

-  Rich..., 805.386.3734, www.vcnet.com/measures.  


--
FAQ on WWW:               http://www.contesting.com/ampsfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm


<Prev in Thread] Current Thread [Next in Thread>