Re: [HamBrewers] j-pole or dipole

Any difference in propagation angle - j-pole vs slim jim? -vu3psz Sent from Yahoo! Mail on Android

---

From: Raj <vu2zap@gmail.com>;
To: <HamBrewers@yahoogroups.com>;
Subject: Re: [HamBrewers] j-pole or dipole
Sent: Fri, Nov 23, 2012 4:21:18 AM

Hi Yan, I built mine from 1/4" aluminium rods (easy to bend). The matching section was a slider mechanism that was made with a potentiometer locking collet nut like this. They were mounted on a bakelite strip along with the coax connector So-239. Turned up neat and easy to slide up down the matching section. Pic from here http://www.sdp-si.com/web/html/shaftacc.htm At 23-11-2012, you wrote:   Hi Raj, I agree, on VHF and higher the J-Pole rules. You have to be a really rich plumber to build a copper J-Pole on 80m!!! On HF, I build several ones with coax and twin-lead for 20m but it was rather deceptive. Not bad, but no much advantages compared to a simple dipole and the disadvantage of 1/4 wave longer. On VHF I also build a 2x5/8 colinear antenna based on a J-Pole. Easy to build and it has gain. http://xv4y.radioclub.asia/xv4tuj-station-radioamateur-en-ok20ua/colineaire-j-pole-2x58-sur-144mhz/ http://xv4y.radioclub.asia/wp-content/uploads/2011/11/A1_Schema-5_8e.pdf It was inspired by a Swedish or Danish article, but I lost the link... 73, Yan. --- Yannick DEVOS - XV4Y http://xv4y.radioclub.asia/ http://varc.radioclub.asia/ Le 23 nov. 2012 à 10:08, Raj a écrit : > I presume it is for VHF then I would chose a J pole. > > Raj, vu2zap > > At 23-11-2012, you wrote: >> >> >> im very new & i want to build my own antenna >> & used to be a plumber so have lots of copper tube >> should i build a di pole or a j-pole ? >> Many thanks > > > > ------------------------------------ > > Yahoo! Groups Links > > >