-=> On 09-28-97  07:06, Jeff Edmonson said to Stan Black,<=-
-=>"About copper pipe j-pole...,"<=-
 
 SB> Hello!  I'm not sure who said it, but I have found
 SB> copper pipe 1/2" rigid to
 SB> be very suitable for building a dual-band j-pole.
 
 JE> Probably me ;-)
 
Dumb question time: I know that most antennas function well on the 3rd
harmonic of their resonant frequency, but how would my co-linear 5/8
wave 2M J-pole do on 70 CM?
 
 SB> I think I have an article on how you build the
 SB> vertical out of coax.  Use a 1/4 wavelength of coax X
 SB> velocity factor and you alternate the connection of
 SB> the center conductor and the shield.  Are we all
 SB> confused yet??
 
Not me.   :-}
 
 SB> Basically, one time the shield is soldered to the center
 SB> conductor and the next section it is reversed.
 SB> Lets figure out this one!!
 
 JE> What's there to figure out?  Cut it specifically for the frequency you
 JE> want to  operate, put about 12 stubs together, shove it inside some
 JE> PVC, put an S0-239  at the bottom of it, and Rock-n-Roll!
 
Sounds interesting... with 12 stubs, somewhere around 13" for each for 2M
makes around 13 Ft.  Do you have any idea about how many dB to expect from
this, compared to a co-linear 5/8 J-pole, which is about 8 Ft tall,
(6 dBd)?
 
73 DE KB9QPM
   Ivy
 
 
 
... "Bother," said Pooh as he read the Solar Flux Data.
 
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