[Antennas] J-Pole

[w8okn at charter.net]

Many of the original J-Pole designs from way back used open wire feedline.
> 
> From: WC Jamison <wcjamison at jps.net>
> Date: 2004/09/29 Wed AM 03:16:16 GMT
> To: kb5rvv at prodigy.net
> CC: Antennas at mailman.qth.net
> Subject: Re: [Antennas] J-Pole
> 
> I see no reason that properly balanced open wire won't work 
> well for VHF and UHF.  It would be a natural for feeding a 
> J-Pole.  The problem would be geting a suitable balun, 
> perhaps 4:1, for connection to the radio, which probably is 
> arranged for 50 ohm coax.  The open wire loss, 50 ft at 450 
> MHz might be as low as 0.5 to 0.7 dB plus the balun loss.  
> The RG-213 coax loss will run about 2.5 dB for 50 ft.  
> 
> In years gone by open wire was the prefered feeder for VHF 
> and UHF TV receiving antennas when the run was longer than 
> 30 or 40 feet.  I installed a lot of it during the 1950's 
> before cable became common.  
> 
> I recognize that coax is much easier to install and maintain 
> and that open wire is primarly used for multi band antennas 
> along with a tuner on frequencies below 30 MHz today.  
> 
>   walt, W7PRB
> 
> 
> On Tuesday 28 September 2004 10:23, Chuck Boyle KB5RVV 
> wrote:
> > No, keep your coax. You don't want ladder line on
> > VHF/UHF.
> >
> > Chuck kb5rvv
> >
> > -----Original Message-----
> > From: antennas-bounces at mailman.qth.net
> > [mailto:antennas-bounces at mailman.qth.net]On Behalf Of
> > Durwydd MacTara Sent: Tuesday, September 28, 2004 9:20 AM
> > To: Antennas at mailman.qth.net
> > Subject: [Antennas] J-Pole
> >
> >
> > I have a homebrew 2M/70CM J-pole 50 ft. in the air for
> > use with a 5W HT. Am currently using RG-213 for feedline.
> > i am wondering if it is worth the effort to switch the
> > feed to ladder line, and if so how to do it?
> >
> >   "Carpe` Diem!"
> >              Durwydd MacTara
> >
> >
> > - - -
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> -- 
> 
> --- Walt Jamison, PE, wcjamison at jps.net, Running Linux ---
> 
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