John Wood on Vancouver Island (its eastern coast) builds custom open
wire line to order. If anyone requests I can look back through my log
and get his call so QRZ.com can provide contact info.
Patrick NJ5G
On 4/6/2014 11:25 AM, K0DAN wrote:
I have 600 ohm homebrew line outside. When it gets to the house, each
leg is soldered to the centers of two pieces of 1/2" hardline (spaced
about 3" apart), which pass thru the entry port and then are soldered
back to open-wire feed inside the shack. The hardline shields are not
bonded to anything. Total hardline length is around 10'). Works great,
and whatever impedance bump there may be is insignificant and is
handled by the tuner anyway. At the point where the outside open-wire
feeder is connected to the hardline, I also have a grounded metal
plate in which two sparkplugs are threaded to act as spark gaps.
There's also a couple 3-4 meg resistors from each leg to ground for
static bleed off.
So your plan is quite similar, and should work well. Sounds like you
do not have a balanced antenna tuner, which might change things (try
it, it might work fine). My antenna, lines, and tuner (EFJ Matchbox)
are balanced end-to-end.
Good luck and 73
dan
k0dan
-----Original Message----- From: Tony
Sent: April 06, 2014 01:43
To: towertalk@contesting.com
Subject: [TowerTalk] Routing Ladder with Parallel Coax?
All:
My shacks location makes it difficult to keep ladder line away from
other cables that enter the house. Someone suggested I use 2 runs of
RG-11 coax in parallel to route the coax inside the house and then
connect the two to the ladder line outside.
The coax shields would connect to the tuner ground and the center
conductors to the tuner output terminals. The shields are left open at
the end where the coax center conductors connect to the ladder line.
Has anyone tried this with a doublet?
Tony
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