[TowerTalk] Using Coax as Ladder Line

[Carl Smidt]

Radio Works has a transformer for feeding Ladder/Window Line from coax. The coax gets you from the transmitter through the wall/window to the input of the transformer hanging outside and the output then goes to the Ladder/Window Line.

73,  Carl  VE9OV
  ----- Original Message ----- 
  From: David Gilbert 
  To: Dan Zimmerman N3OX 
  Cc: towertalk at contesting.com 
  Sent: Friday, April 20, 2007 12:01 AM
  Subject: Re: [TowerTalk] Using Coax as Ladder Line



  What it buys you is a fairly good way to get a balanced line through the 
  wall without severely unbalancing the line or coupling RF to wood, 
  metal, etc.  The short length of the coax going through the wall adds 
  insignificant loss at HF frequencies.

  Dave  AB7E



  Dan Zimmerman N3OX wrote:
  >> I saw something somewhere about using coax as ladder line to get out of your house.  >Seems like the center leads of a pair of coax were connected as if they were the ladderline at >the tuner and the shields tied together and then to ground at the station.  The ends outside of >the house then had the two center leads tied to the real ladderline and the shields tied >together at that point also.
  >>     
  >
  > Yes, you can do this to make balanced shielded line, but it doesn't
  > buy you a whole lot.  It has basically the same loss as a single coax
  > run, which can be quite a lot if you're using open wire or window line
  > to feed a multiband antenna with a tuner.
  >
  >
  > 73,
  > Dan
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