What I don't know about baluns would fill volumes. I'm trying to help a
fellow ham, even less knowledgeable than I (if you can believe that
possible) but are running into a lot of confusion.
Here is the application of interest:
My friend is building a portable one man operable sectional mast (guyed
when he uses enough sections to make it required) with an adjustable
length horizontal dipole on top. Recall in the olden days how
automotive antennas were telescopic metal whips that could be manually
lengthened and shortened? Well he has a pair of these ON STEROIDS. They
collapse short enough to make a 1/2 wave dipole for 6m and extend long
enough to be a 1/2 wave dipole on 40 m. They are robust stainless steel
(yeah, I know not the best conductor) but they will survive his use and
the weather.
I told him he needed a balun to interface the unbalanced coax feedline
to the balanced antenna. ...and then massive confusion ensued... he was
sold something I have determined is not going to work. I think the term
balun is a description of what a device does but not how it does it.
Anyway he will be running low power, i.e. no more that 100 watts and
typically QRP. I'm taking him with me to a ham fest departing for it
before sun rise Saturday (day after tomorrow)
If someone could fill me in regarding what he needs maybe we can buy one
then.
I have a UNIDILA balun that is coax in and flying leads out but his
dipole arrangement has an SO-239 so he wants to connect the balun to the
antenna via a double male UHF (double ended PL-259, I forget the
number) We can adapt as required, even flying leads to UHF connector.
Please tell me what the best couple choices are for this application and
I'll try to steer him in the right direction.
Thanks for any consideration,
Patrick NJ5G
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