Ian White GM3SEK wrote:
Cecil Moore wrote:
Ian and I agree

... about quite a lot actually :-)

Lurkers may get the impression that we disagree a lot. :-)
Most of us technical types agree on 99 and 44/100% of
technical topics. We often argue about which favorite
approach is better when they are equally effective.

I just plotted the impedance of a lumped inductor in
parallel with a lumped capacitor, the impedance based
on a transmission line analysis, and the impedance
actually measured. The three graphs overlaid each other
until approaching the series resonant point where the
transmission line analysis more closely matched the
measured results. In particular, the actual measured
value was around +j258, the transmission line value was
around +j135, and the lumped circuit value was around
-j570.

"Bunched" and "flat" both mean the same to me - the cable is wound into
a flat coil like a length of rope. The actual choice is between that
shape and a cylindrical solenoid shape.

I don't think that's true, Ian. There are three ways to
wind a choke. 1. helical, 2. spiral, 3. random I'm pretty
sure "bunched" means "random" and *not* flat. Maybe that
is the origin of our disagreement over "bunched". If the
bunched coil was really random scatter winding, would you
like it as much?

There are details of HB meters on my website, or the MFJ-854 is a good
commercial alternative (but definitely not the MFJ-805).

I've got the MFJ-853. It snaps but doesn't unsnap. :-(
--
73, Cecil http://www.w5dxp.com