TexasRF@aol.com wrote:
> After more reading in the Orr book, I discovered a discussion of feed
> through power in a cathode driven amplifier.
>
> We have all heard about the drive power adding to the output power. Orr
> says, and I am paraphrasing here, that a PORTION of the drive power is added
> to the output power. He goes on to say that the greater the ratio of drive
> power to the feed through power, the better the imd performance. He further
> suggested that the optimum feed through power for best imd performance is
> about 10%.
>
Isn't that previous statement contradictive? IOW the first statement is
the *more* the better, while the second says 10% is best.
73
Roger (K8RI)
>
> Heck, 10% of a 100w drive level is insignificant and might as well be
> ignored.
>
> He did not describe how one goes about attaining the 10% feed through level
> and I suspect there is no control of this. Perhaps you get what you get
> with a given tube?
>
> He also wrote about the improved imd performance due to the heavy negative
> feed back inherent in cathode driven amplifiers compared to grid driven;
> often in the 10 to 15 dB range of improvement.
>
> We have always heard this to be so; at least that old saying is correct.
>
> 73,
> Gerald K5GW
>
>
>
>
>
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