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KG5DCM ENCLOSED "UGLY BALUN"

Most of you may be familiar with the standard HF "Ugly Balun" but this fairly simple project will show you my ideas for one that is enclosed and out of the weather.
You may modify any or all of these instructions to suit your needs and skills.
Just make sure to use the coax length of about 18 to 20 feet.

 

 


 
Finished with paint job and installed.

Materials list and description of work.:
 
14" of 4" PVC. (all pvc is schedule 40 unless otherwise noted)
2 -  4" PVC caps
1 - 1 1/4" PVC coupling
2 -  PL-259 male connectors
2 -  SO-239 barrel or female connectors.
18'-20' RG8 cable
#6 or #8 self-tapping screws
small scrap piece of 1/2" pvc.
 
 
 

I began by turning the 4" caps on a lathe to drill large holes in the ends for 1 1/4" pvc conduit. Realizing not everyone has access to a lathe but a correct size hole-saw will do the job.
 

Make the TOP cap hole a snug fit for a 1 1/4" coupling. The bottom cap hole can be whatever you want to use that will fit up a 1/2" CGB connector for the coax lead to exit thru. But you want it large enough that the PL259 will go thru it. In case you don't know what a CGB connector is..see photo below.



CGB CONNECTOR

Glue the 4" PVC into the BOTTOM CAP.  Slide the TOP Cap onto the 4" only far enough that you can get it off again and drill 3 holes equal-distance around the circumference. (Be sure to make one of them as a "match line" )

Now you are ready to coil up the coax inside the tube. I wrapped the 20' length of coax around a short piece of 2" pvc and taped it in place overnight.

Next day I released the tube and let it un-coil. After running enough out the bottom hole to install a PL259, start coiling the coax a few coils at a time and pressing it down firmly. Make sure each new coil is firmly seated against the last one in the tube. At the end of the coiling process tie the final coil off with a bolt or screw so it can't release and come out. Install PL259 on each end (or whatever connector you plan to use). When installing the coil, be sure to thread the CGB connector onto your coax (from the radio) before installing the PL259.

When finished with both ends, the CGB connector can be "screwed" up into the 1/2 pvc (see picture) mounted in the bottom and the coax connectors will be inside the tubing out of the rain and weather. I have 3 screws mounted into the 1 1/4" conduit under the top cap to keep it from sliding down---this holds the whole unit up and takes all the weight of the balun. I also drilled a few "weep" holes around the bottom cap where the CGB connector is to allow any drainage out.


You can certainly modify the materials used in this project to fit your needs and use your own methods to get the desired results for an enclosed "ugly balun" and I hope this simple article will give you some ideas that you can work with....73 John, KG5DCM

Email me for any questions you may have to   john.riddle62 AT symbol yahoo.com 



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