VE7AVV -- TH6 balun replacement project

Created: September 21, 2003

This BN86 is at least 25 years old. While it had served me well, it was time for a replacement.

Scrapping out the DuctSeal revealed a hole in the case and corrosion around the PL259 connector

Being curious about the innards of a device that sells new for $80 US, a DREMEL tool was used to cut the case.
There really isn't a great deal one can say -- it's ugly.

It's amazing the KW's that entered here found
their way out of this maze to the DX!


The simplistic new balun is 4-turns of RG213 on a PVC form that is just under 7 inches in diameter. To get a real nice edge on the thick-wall PVC material, cut it on a table saw. Use UV-resistant tie-wraps.


Standard pig-tails -- 8" per leg with " lug terminals (crimped and soldered). Each leg is covered with UV-resistant shrink tubing. The 'Y' is wrapped with tape and then coated with a layer of StarBrite liquid tape

New balun installed for the TH6.
The balun should be insulated from the boom. In this installation, the balun is air-mounted 4" below the boom -- suspended with ⅜" rope. .

 

Keep the distance between the last turn of the balun and the feed-point as short as possible.
 

 

                   
StarBrite liquid tape keeps the connections dry and makes opening an old connection easy.
 


Last modified February 08, 2004 by Paul B. Peters, Show contact information
Copyright 2000 -2003 Paul B. Peters, VE7AVV. All rights reserved.