[TowerTalk] Routing Ladder with Parallel Coax?

[Patrick Greenlee]

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 at 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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