My use of the words "average IMD" was out of place and I apologize.
Please do not let this cloud the discussion.
73, Tony W4ZT
Tom W8JI wrote:
> Hi Gary,
>
>> My contention of using the other side band is that you are always
>> moving the receiver pass band the same amount every time you switch
>> side bands as opposed to tuning around. You can quickly switch
>> back and forth to compare levels of wanted and unwanted signals. It
>> give you pretty much the same information as you get by tuning but
>> it is very repeatable when checking various signals on the band.
>> You can get a feel for what the signal levels should be on the
>> opposite side band with some practice.
>
> Why worry about precise repeatability with a rough test?
>
> We know now the test initially claimed to measure IM average power
> ratios measures something near peak power, misses some of the third
> order and much of the higher order products, and probably isn't
> useful on the air except under certain conditions.
>
> Is this test explained correctly anyplace? Is it explained
> incorrectly anyplace where it should be corrected?
>
> 73 Tom
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