[Antennas] J-Pole

Tue Sep 28 23:16:16 EDT 2004

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 ---