kd5sak wrote:
"Cecil Moore" wrote in message
om...

jimbo wrote:


OK, I have a new 2 meter j-pole antenna installed in my 3rd floor attic.
I have 50 feet of LMR240 coax running to the basement. I measure SWR at
the following frequencies on simplex.

144.2 2.5
145.2 2.4
146.2 2.3
147.2 1.9
147.9 1.7

Can I conclude that the antenna is electrically short for the 2 meter
band?

That's what I would conclude from the data given. Wind some
wire around the tip top and extend the antenna by a few
inches. Then repeat your SWR measurements.
--
73, Cecil


One might also try adjusting the feed point location and see what effect
that has.

Harold
KD5SAK



I have done that on a j-pole that I made, but that antenna was in my
shack, where it was accessible. This antenna is in a third floor attic
where I have to wriggle my feet through 14 inches of insulation to
find a rafter to stand on. Not conducive to much tweaking.

Thanks, jimbo