David wrote:
Thanks. You have confirmed what I was thinking - it is *probably* the
oxide causing the problem.
It's not a waveguide in the normal sense of the word, transmitting a TE or
TM wave down a hollow tube, but more like a coaxial line transmitting
something close(ish) to a TEM wave. The outer conductor is uncoated
aluminum and rectangular in cross section. The inner conductor is brass.
See pictures attached
Looking at the pix, there appear to be lots of aluminum joints due to
the "built-up" construction, maximizing the potential for the sort of
troubles you are having. I would re-make the piece in brass, doing
everything possible to use as few pieces as possible (for example, by
milling recesses into one piece rather than building up a compound piece
from more easily machined sub-parts).
I would also plate everything in silver.
Best regards,
Charles
_______________________________________________
volt-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
