[Elecraft] Transmitting low power through the PA

[Ron D'Eau Claire]

The output filters are designed to match specific impedances and the
impedance at the power amp output is a function of power. At very low power
levels they are far from their design center. 

IMX badly matched output filters are not usually consistent with good
filtering and low spurious emissions.

Ron AC7AC

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

Dave G4AON wrote:
> 
> Julian the problem with running low power through a high power PA is
> that you get poor efficiency. A typical HF transceiver running 5 Watts 
> output from a 100W PA may be drawing 8 Amps to do so. The Elecraft 
> solution nicely improves efficiency and works well for most situations.
> 
Okay, but if you are more concerned with reliability than the cost of the
electricity bill, wouldn't it be better to run all the components
conservatively well within their ratings, than endure the constant heating
up and cooling down of the low power PA components?

-----
Julian, G4ILO. K2 #392  K3 #222.
http://www.g4ilo.com/ G4ILO's Shack   http://www.ham-directory.com/ Ham
Directory    http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 
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