I think a lot of new comers to ham radio ought to be reading this
discussion on antenna tuners and baluns, especially the little primer by
Puck, W4PM, and the follow on by Clark, WA3JPG.
I have used open wire feeders for years (although not at the moment) to get
the most out of whatever type of antenna I can get up on my 50-foot lot.
I've had success with an 80-meter center-fed dipole (sometimes called a
Zepp--it's not a true Zepp) which put me on all bands. I think my favorite
was a 40-meter delta loop fed with open wire, which permitted operation of
40 and above.
I have built many T-type tuners and used them successfully. However, I
prefer the SPC to the T for reasons stated earlier in this discussion. I
have also used the 238, which, I think, is my favorite.
I started this note to remind the group of the work of Jerry Sevick, W2FMI,
in the area of baluns and ununs. In fact, his book by that name is quite
interesting (I think it may be published by CQ). Sevick seems to have
perfected the method for making efficient baluns depending on the antenna
system you choose to build. I recommend it for anyone who needs or wants
to know more about baluns (or ununs).
One thing more: the Amidon Company offers baluns and ununs based on the
Sevick designs. You may want to check out their ad in CQ (have never seen
it in QST). It's not in every issue, but you should have to look too hard.
Joe Koppi, W0SU
St. Paul, MN
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