[Antennas] J-Pole

Wed Sep 29 13:19:14 EDT 2004

No.. I don't think he's kidding.. The whole point of open wire feeeder is
that it has very low loss. It is the most efficient feeder type that's
available to us. Line loss increases with frequency, with SWR,and with line
length, so VHF/UHF antenna system have the most to gain by using open wire
line. Good quality "Ladderline" is a less efficient feeder than proper open
wire line, but has less loss than coax..'specially if SWR is high.
 However.. coax is much simpler to deploy than open wire line, and good
quality hardline has acceptable losses so long as SWR is low, and lengths
reasonable. Most of us settle for that, and put up with the losses. We can
compensate for loss of transmitted power by using a linear amplifier, and
for RX loss with a good low noise mast head preamp.
 73
 John EI7BA http://www.iol.ie/~bravo/
>> W1GOR wrote:
>>> Ladder-Line for VHF/UHF...? You've gotta be kidding..!
>>>> 73, Larry - W1GOR
>>>> ----- Original Message -----
>> From: "Durwydd MacTara" <durwydd at hotmail.com>
>> To: <Antennas at mailman.qth.net>
>> Sent: Tuesday, September 28, 2004 10:20 AM
>> 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
>> >