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

Don Wilhelm w3fpr at embarqmail.com
Mon Dec 20 20:50:56 EST 2010


  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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