Saturday, December 26, 2015

Adjustable windom style antenna

Ok, so I had a qso with Dave Owen (K7VNH) and we were talking about windom style antennas.
We have this style at out club station K2LDS, and we are able to tune this for most of the bands with 1:1 SWR

During our Qso, I was having a difficult time explaining the tuning mechanism, so I decided to make a drawing. the picture below is a representaion of how our antenna works. We do not use an auto tuner with our radio rather we tune the antenna to the band we are working.  


This drawing show one leg of a window dipole antenna and how it adjusted. we set a carrier on the antenna and then move the wench watching the SWR meter until there is a 1:1 ratio. Once we are set then we start working stations. Usually we only need about 10 watts.

Note: the balm is a 4:1 and the wire and rope are connected with an insulator. The max sheave size is about 2" on the pulleys.

This design is not mine, but is the brain child of Joe Maughan (AA7J). We tried it with old battery powered drills to work as the wenches and change the lengths from the shack. However they are not very weather proof. So in the end we went back to the hand wenches.


2 comments:

  1. Jason, thanks for the QSO and the picture. I may need to build one for my city.
    73's K7VNH - Dave

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  2. It would appear that the author has put a considerable measure of diligent work into this.
    longest range tv antenna ever

    ReplyDelete