[Amps] Checking for IMD

[R L Measures]

On Aug 11, 2006, at 4:18 PM, Tom W8JI wrote:

>
>>    I always have a problem when it comes to trying to make
>> perfect
>> measurements when in reality it is the entire system that
>> counts.  That is
>> to say if you exciter is good enough to put on the air and
>> you goal is to
>> add an amplifier and put the pair on the air, then just
>> make a simple two
>> tone test using the two.
>
> Since the IMD can add or subtract with variations in power
> level, cable lengths, and other things I would think a
> person would want to know how much contribution the
> amplifier makes when determining how good the amplifier is.
>
> If you want to know the exciter and amplifier's combined
> bandwidth with normal speech, then you should measure it
> that way. A two-tone IM test is pretty much useless of you
> want to know bandwidth.

Amen, Mr. Rauch. Example:  With a G2DAF amplifier, the IMD level with  
human speech is typically 11X worse than it is with a 2-tone test.
>
> 73 Tom
>
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org