Regarding the choke construction and implementation. Mike and I have had an
offline exchange, with pictures, and I think we have agreed that the choke
has been constructed properly per the newest K9YC specifications using a
2.4" Type 31 Fair-Rite toroid and 18 turns of RG400.
Also, the 150' long coax feedline has never been attached while taking any
measurements. At least not any reported here. All of the recent data (taken
with the RigExpert analyzer) I've put in tables in postings has been while
being connected to the output of a choke. The feedline was not part of the
equation. The coax stubs coming off of the choke are only a couple of
inches long on each end. The body of the RigExpert is plastic and it
doesn't seem to matter whether or not I'm holding it but I do take the
"official" measurements with it sitting on a towel on the ground. I did
also take measurements with a 4' coax jumper between the choke output and
the analyzer just to get the analyzer clear of the radial attachment area.
This made no appreciable difference in the measured values.
At this point the "antenna erected over haunted burial ground" theory is
sounding more and more plausible.
Hope to catch lots of you guys, hey and maybe some DX too, on the 160
contest this weekend.
73,
Todd - NR7RR
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|