[Elecraft] OT: modifying your amp for lower drive requirement

[Ron D'Eau Claire]

Sure, but it's very easy to design a low-loss broadband matching network to
provide the required impedance transformation. 

One HB amp of mine used a 16:1 transformer at the input for just that
purpose.

Ron AC7AC

-----Original Message-----
  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