[CQ-Contest] Output pad for running QRP?

hwardsil1 at mindspring.com hwardsil1 at mindspring.com
Fri Sep 28 19:04:51 EDT 2001

Good point, Tom.  My post was referring to CW operation (I'm a CW guy...) where this is much less a concern.  An attenuator pad would need some kind of external T/R switching to bypass it on receive, unless you're willing to give up 2+ s-units on receive.

73, Ward N0AX

Original Message:
From: Tom Rauch w8ji at akorn.net
Date: Fri, 28 Sep 2001 14:33:06 -0400

Many radios have notoriously slow ALC systems, and virtually all 
solid state radios go through a minimum in net transmitter IMD 
when operated at the rated power. Even if that isn't a factor, every 
radio I know of biases a stage closer towards cutoff to reduce drive. 
That works OK if the gain reduction is slight, but it is a big time 
problem if you are reducing gain more than the factory planned on 
for normal operation. What you are doing is moving a very early 
class A amplifier towards class C (cut-off) to reduce gain! 

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