[HCRA] 6:1 Current Balun - Looking for Construction Information

[w1eqo at shaysnet.com]

Find a copy of Jerry Sevick's (W2FMI) (SK) book. The latest edition has a
green cover. I remember giving one away at Hampden Cty meeting once, and
can't see mine at the moment. I believe the title is something like "Baluns
and Ununs"

You may find a lot of banter on the web about baluns, this guy provides
correct info. Some of it pout there is...how do I say it?...balderdash.

Essentially there are two devices made for your application: Transformers
and balun-like devices. Both are made from ferrite cores at HF.
Transformers are a bit more lossy, but might do the job here. This is
because your ratio is not in terms of squares, as in 2^2:1, (4:1) or 3^2:1
(9:1). Sevick's book will provide a design and answer for this problem, as
he does for many other odd-ratio baluns. I believe the book is $20 from the
League.

You will want to test that antenna against a regular dipole. An OCF dipole
is inherently unbalanced and so receives some cross-polarization. Perhaps
that is what the balun is for, then the antenna will 'look-like' a center
fed dipole with both sides equal to the shortest side.


Jim, W1EQO



Original Message:
-----------------
From: Rick Lindquist, WW3DE ww3de at comcast.net
Date: Sun, 4 Dec 2011 10:58:22 -0500
To: gjcollins at cox.net, hcra at mailman.qth.net
Subject: Re: [HCRA] 6:1 Current Balun - Looking for Construction Information


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>I'm too cheap to buy one

A true ham!

You're right, George. The ARRL Antenna Book dances about the subject of 1:6
ratio baluns, but it also says that you could use a 1:4 balun for the sort
of OCF antenna you're describing and, I'd guess, without much degradation in
performance. It might require using a tuner before the transmitter to
compensate for any mismatch. There are details out there somewhere for a
6:1, however. Just can't recall where I've seen them.

73, Rick, WW3DE (ex-N1RL)


-----Original Message-----
From: hcra-bounces at mailman.qth.net [mailto:hcra-bounces at mailman.qth.net] On
Behalf Of George Collins
Sent: Saturday, December 03, 2011 11:57 PM
To: HCRA Mailing List
Subject: [HCRA] 6:1 Current Balun - Looking for Construction Information

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-------Hampden County Radio Association-------
-----------e-mail list (reflector)-------------
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Hello,

I'm looking for construction details for a 6:1 current balun.  I would like 
to try an OFC dipole design that was published in QST some years back, but 
it requires a 6:1 balun and I'm too cheap to buy one from DX Engineering or 
one of the other vendors.  Besides, I may start with small cores for QRP 
power levels; if it doesn't work out I may not want to invest in a 
high-power balun.

I've looked through the ARRL literature and Googled various subjects but 
didn't come with anything on a current-type balun.

Any help will be very appreciated.

vy 73,

George, KC1V 

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