[TowerTalk] Balun Recommendation

[EZ]

> Except (possibly) for protection from freeze/thaw cyless, there is no 
> good reason for a common mode choke consisting of winding multiple turns 
> of coax through one or more cores to be in a box at all!  The "labor" 
> consists of running the coax through the core(s), and if there are 
> multiple cores, lashing them together with ty-wraps. If they're on a 
> wire dipole, or on coax coming from a vertical, you're done. If they're 
> on a typical beam, the coax at both ends of the choke simply must be 
> mechanically secured to the boom.  The only reason for putting this kind 
> of choke in a box is so that you can sell it to someone!
> 
> The lower cost  bifilar-wound chokes I've designed that DO require some 
> sort of packaging, but I'm not at all convinced that they needs to be in 
> a BOX.  What IS needed is a means of adding SO239 connectors and strain 
> relief so that they can be patched into an existing transmission line.  
> My neighbor, W6GJB, who is much better with mechanical design than I am, 
> worked up a nice method that uses PVC plumbing parts to hold the 
> connectors.

So put it in a box and leave the lid off?

Chris
KF7P