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echo: ham_tech
to: STAN BLACK
from: RAY BROWN KB0STN
date: 1997-10-03 21:42:00
subject: re: Dual-Band J-pole

> Hello!  If you want to make your j-pole a dual bander, just 
> extent the long 
> element to 61" and it will work great on 2 meters and 440mhz.
> I have one that tunes down just fine on both bands.  I put a 
> brass bolt in the
> short leg and soldered a nut under the cap so I can tune it 
> without moving the
> coax connections.
 
  Not having any 440 gear, I can't tell you for sure about this, but several 
folks I know of here locally go ahead and run their 440 gear straight into a 
2m j-pole with no modifications, and no complaints. :-)
 
> I don't know if another section can be added to get more 
> gain. Haven't tried 
> that yet!!
 
  I saw on the Internet about one fellow who built a super-d-duper j-pole. He 
had a web page describing it. Anyways, imagine a conventional j-pole with a 
1/2 wave matching loop, a 1/2 wave radiator, another loop, another radiator, 
one more loop, and one more radiator. This guy was claiming 12dB gain out of 
the antenna! He had it guyed up, he was down in Florida so he _had_ to guy 
it, you see... IIRC, total height was around 44'. Maybe that was just 
assembled height off the ground.
 
  If you want, send me an Email at   r_brown@getonthe.net  and I'll send you 
the URL.
 
                                                        _Ray_
 
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