I put up a 160-meter Inverted L in my backyard with traps for 80 and 40 meters.
The vertical section is up about 35 feet with 31 feet of wire between the
80-meter and 40-meter trap. From the 80-meter trap to the end of the antenna
is 60 feet of wire. It is hung as a sloping U. At the end of the U bend in
the wire is a 4-inch pulley. It's the best I can do with my small yard. I
have tried various lengths of a counterpoise as well as my radial field with no
luck.
From my VNA
80 Meters at 3.850 MHzSWR-11.5Smith Chart- 26.7ohms 372pfResistance- 50
ohmsReactance- S11x100 -111 ohmsSWR at 4.000 MHz is 12.6
160 Meters at 1.9000 MHzSWR- 32Smith Chart- 1.648 ohms 473
microhenriesResistance- S21x100- 50 ohmsReactance- S11x100- 10.04 ohmsSWR at
2.000 MHz is 50
I obviously have a lot of research yet to do but wanted to see if these results
make sense or not. Any ideas on the best way to tune this?
73,Bill KO4NR
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|