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echo: ham_tech
to: IVY IVERSON
from: ROY WITT
date: 1997-09-30 08:10:00
subject: copper pipe j-pole

Hello Ivy.
27 Sep 97 20:51, Ivy Iverson wrote to Jeff Edmonson:
 II> Dumb question time: I know that most antennas function well on the 3rd
 II> harmonic of their resonant frequency, but how would my co-linear 5/8
 II> wave 2M J-pole do on 70 CM?
Sure, if you thought to include a 5/8 wave 440 element on that J-pole.
 JE>> What's there to figure out?  Cut it specifically for the
 JE>> frequency you want to  operate, put about 12 stubs together,
 JE>> shove it inside some PVC, put an S0-239  at the bottom of it, and
 JE>> Rock-n-Roll!
Won't work very well.  Needs a little more thought.
 II> Sounds interesting... with 12 stubs, somewhere around 13" for each
 II> for 2M makes around 13 Ft.  Do you have any idea about how many dB to
 II> expect from this, compared to a co-linear 5/8 J-pole, which is about
 II> 8 Ft tall, (6 dBd)?
You havne't seen the collinear article in the HAM-ECHO yet?
... These cookies don't taste anything like girl scouts!
---------------
* Origin: KB6PI's Antenna Farm * San Diego, CA (1:202/909.10)

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