[Amps] 4CX250 IMD

[Steve Thompson]

> This thread has me wondering how accurate IMD or even PEP was measured 
> in the late 50's, early 60's. Would the readings that National provided 
> for their 4CX1000A military amp hold up to todays techniques and 
> instrumentation?
My guess:

Comparison against fixed attenuators using either spectrum 
analyser or receiver should give fairly good accuracy of relative 
values.

Calibrating a diode detector against cw should give reasonably 
accurate pep readins.

Steve