[1000mp] Test IMD vs actual IMD

[Jan Erik Holm]

Why bother testing or improving IMD?
People will run their processors/audio gain
wide open and splatter like h**l.
More then 50% of the radios that can me
heard on the ham bands every day sounds
awful due to incorrect modulation level and
one consequence will be increased band with.
It sure didn�t use to be like this 30 years ago.
These days people just don�t care so why
bother.

Jim SM2EKM
-----------------------------------------------------------

Joe Subich, K4IK wrote:

>>How does IMD, as measured using the standard methodology, compare 
>>to IMD produced with an actual voice SSB signal?  What
>>little I know about it suggests to me that the IMD would be less 
>>for the SSB signal. Am I off base?
>>
>
>In many cases two tone testing produces better numbers than one 
>encounters in the real world.  This happens for two reasons ... 
>
> 1) two tone testing does not test the low frequency (syllabic rate) 
>    power supply response issues. 
>
> 2) voice is not two-tone ... it is very complex with multiple 
>    tone characteristics.  
>
>Two tone testing is used because it is repeatable, relatively 
>easy to implement with simple test equipment and easy to "read." 
>
>73, 
>
>   ... Joe, K4IK 
> 
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