It should be mentioned that using your coax as the counterpoise is not best practice.
73
-Jim
NU0C
On Sat, 24 Feb 2024 18:25:40 -0500
"Barry K3EUI" <k3euibarry@...> wrote:
*I've had a? MyANTENNA? 130 ft? end fed ? 1/2 wave? with?? 49:1 UNUN? up
for one week and it works but is very "touchy" to tune up around 3580 kHz*
*I took it down, added wire, and set up a Palomar? 9:1 UNUN?? and now
have a _non-resonant wire length of 155 ft_? for 80m*
*Feed line is 100 ft?? RG213? with a? RF choke at 95 ft from? UNUN, so
a? 95 ft "counterpoise" using the coax shield.*
*This is my final adjustment using an Ameritron AT-20 manual T network
tuner in the shack
*
*Tuned up for lowest SWR around 3580 kHz for NBEMS nets on weekends*
*Return Loss about _27 dB_?? at resonance, as shown.
*
*
*
*Let's see how it compares to a standard 1/2 wave 130 ft? center fed
dipole with 1:1 BALUN*
*
*
*de k3eui barry*
*==========================*
--
73
-Jim
NU0C
Jim Shorney