[Amps] Nat NCL2000

[Gary Smith]

The word is "flatulent" or "flatulence".  Personally I think it stinks. 
Others say its a gas.
73,
Gary...wa6fgi

----- Original Message ----- 
From: "Peter Chadwick" <g3rzp at g3rzp.wanadoo.co.uk>
To: "Bill Turner" <dezrat1242 at ispwest.com>; <HOWARDLYON at aol.com>; 
<amps at contesting.com>
Sent: Thursday, February 23, 2006 9:29 AM
Subject: Re: [Amps] Nat NCL2000


> Bill Turner said:
>
>>Amp-derived ALC never works exactly like you want it to.<
> I'm not that convinced that any ALC really does....it's usually 
> implemented such that it's trying to close the door after the horse has 
> bolted.
> I suspect that to avoid that approach, the ALC needs to start kicking in 
> at some power level below where you want it to hold the power. To get fast 
> attack and not have the loop unstable or transients screwing things up, 
> you need a balanced gain controlled amplifier (really a 4 quadrant 
> multiplier) and a balanced control loop and it gets so messy  that I for 
> one say "*&%8^@# it"  and don't bother.........A bad ALC loop produces 
> plenty of what Rich calls, politely, 'feculence'. I have a cruder name for 
> it.......
> 73
> Peter G3RZP (but not at home yet)
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