[TowerTalk] Balun for Quad

[Herbert Schoenbohm]

I guess I am to blame for starting this thread in the first place but 
after hearing an old timer tell me years ago that a balun is only good 
for hanging your dipole wire on to.... so I wanted some advice.  Now for 
your quad I have the same problem but can not even use a diamond 
configuration and the coax dress is up to the boom. Since my quad is a 3 
element Cubex any additionally weight on the wires are going to create a 
problem.  To pick up the weight of the three feedlines I put a piece of 
1" PVC down from the boom to tape the feedlines to.  But I am still 
concerned about noise and a balance feed.  I even considered a gamma 
match to each wire but that would also add significant weight.  I even 
considered placing coax into a wire braid sleeve cut for 1/4 wave and 
connected only in only at one place to the coax.   I believe this idea 
would work as well as any balun and maintain the low wind profile I 
need. However, I am not sure what impact of bunching all those sleeved 
feedlines together would have. Cubex does not recommend a balun at all 
but I don't know why.  Perhaps a Pawsley stub single wire taped down the 
feedline and connected to the center conductor at the feed point would 
be adequate as this seems to be popular for VHF yagis in some places. I 
am amazed at how simple this solutions appears but why would anyone want 
to hook any extranious wire to the coax center conductor was my first 
thought.


Herb Schoenbohm, KV4FZ





On 11/27/2014 9:10 AM, Chuck Dietz wrote:
> I hope everyone is not burned out on the balun thread.  I am planning to
> resurrect my 4 element triband quad.  It will be in the "diamond"
> configuration and fed at the bottom spreader.  Obviously I need the
> smallest, lightest balun I can get.  I have used the "DU" long commercial
> baluns in the past, but I am wondering if I can just wind a balun
> transformer on a core and be much lighter and less wind resistance?
>
> Thanks in advance for your thoughts,
>
> Chuck W5PR
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