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Subject: [AMPS] IMD
From: (2)
Date: Tue, 18 Sep 2001 07:47:03 -0700
>> >>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.
//  Adding bass responce would put 3rd and 5th IMD products inside the 
passband window. This would seemingly subract from the energy available 
to generate side-splatter on those outside the window.  Comments?


-  R. L. Measures, 805.386.3734, AG6K,  

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