> I still think something in the amp or something in the
> feedline/antenna/tower/guy system can cause the problem. In response
> to the initial question, I asked about ferrites in the tank. But
> maybe a solid state driver could produce the sub-harmonic. If the
> measurements are correct, then the spurious is truely a sub-harmonic
> and it becomes interesting to find the source.
It is especially interesting now that Dave says he duplicated the
problem with diodes.
I have never been able to generate a submultiple of a signal with an
form of non-linear system, including saturated ferrites.
I wish it were that simple.
> from one > cycle to the next to be lower in frequency. To be an odd
> fraction of the > fundamental would mean that the non-linearity
> effects one cycle of the rf > fundamental but not the next!
That is correct. Dividing frequency requires more than a simple non-
linear junction, or a non-linear device like saturated ferrites.
Whatever it is it requires that one point in one cycle is *not*
treated like the next repeating point. That's why you never find
subharmonics generated in solid state or tube-type PA's, ferrites, or
conventional diodes. 73, Tom W8JI
W8JI@contesting.com
|