Re: OT: modifying your amp for lower drive requirement

Posted by Don Wilhelm-4 on Dec 21, 2010; 1:50am
URL: http://elecraft.85.s1.nabble.com/OT-modifying-your-amp-for-lower-drive-requirement-tp5854009p5854509.html

  Phil,

Your statement amplifies the difference between "ham assumptions" and
reality.
The data-sheet indications of gain do not consider the input impedance
(and loading of the driver), that parameter is quite important in actual
use -- if the amplifier does not provide a good load to the driving
transmitter, then "all bets are off".

73,
Don W3FPR

On 12/20/2010 8:28 PM, Phil & Debbie Salas wrote:

> "It's very unlikely any solid-state amplifier uses an input attenuator:
> Transistors and FET's just don't have that much gain."
>
> The Ameritron ALS-600 has about a 15 ohm input impedance.  Then they put a
> series 35 ohm resistor for matching and reducing gain.
> Phil - AD5X
>
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