>At 06:25 PM 2/15/2000 -0700, you wrote:
>>>
>>It is only true if the amplifier is tuned up at 250w. If the amplifier
>>was tuned up at 1000w, and then the drive was reduced to 1/4, there would
>>be less circulating current through the contacts with reduced drive. .
>
>Don't I recall that you (and maybe others) have indicated that this is the
>proper way to tune for best IMD --- set up at full power and then reduce
>the drive?
>
Carl Heuther and some others approve tune-up at full smoke - followed by
a small increase in loading. I doubt that increasing loading a tad
makes a noticable improvement. The major source of feculence is
undoubtedly solid-state radios - not amplifiers. For example, 3-500Zs
are typically -40db, while radios are in the low to mid-30s range.
cheers
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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