[TowerTalk] Open wire feed line length

Richards jruing at ameritech.net
Wed Jul 2 13:36:07 EDT 2008

I believe the use of nonresident feed line is a common consideration.

Apple with the dipole, I am thinking that your ground system is a good idea,
but maybe not fully necessary, as the antenna is fully balanced.

Why not use a 4:1 balun, to bring the 450 ohms on the window line
down to 50 ohms, or thereabouts?  In outboard tuners, there is
usually a 4:1 balun, not a 1:1 balun, for open feed line,  so I am
curious about your choice of that ratio.

Thanks in advance
Happy trails and 73.    ----  Richards - K8JHR ----
w4lde wrote:
> The 1:1 current balum used to convert the 450 ohm balance line is 
> external to the tuner, use about two feet of coax  from the balum to the 
> tuner.
  > One article recommended odd multiples of a wave length is desirable at
> the lowest operating frequency while other articles don't address this.


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