[AMPS] IMD

[Tom Rauch]

> >>Reducing drive power from an exciter does not always make things
> >better. Quite often it actually makes things worse.

> For example, the ARRL expanded test report clearly shows the 1000MP is
> very clean on output until you reach 25 watts and below.
> 
> Bill K1XT

 That's right, my IC-751's get worse at low power. I find that a 
common trait in systems with solid state amplifiers.

In the case of the 751A, changed driver transistors and revising the 
bias system in the PA section cured the problems.

I also see contestors (and others) are bumping up the internal 
power limit controls, like CB'ers do. That is really bad news, and so 
is use of audio equalizers to add bass response.


73, Tom W8JI
W8JI@contesting.com 

--
FAQ on WWW:               http://www.contesting.com/FAQ/amps
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com