David wrote:
A practical problem is the tools available to me. The U-channel was
machined by someone in my radio club, and the rest I made myself using
nothing more than a drill and hand tools. It would be nice to make more out
of one piece, but it would require better tools than I have readily
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. Th
On 19 September 2017 at 20:32, Charles Steinmetz
wrote:
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
On 18 September 2017 at 23:28, george wrote:
> The reason that DC is used commercially to measure resistance is simple,
> if you use AC you may well get the reactive component as well as the
> resistance coming into play.
>
That may not be an an issue with a dual-phase lock-in amplifier, as the