John,
I put up one of these for my father N5LK, up 25' in the center and 30'
on one end. I dint use the specified length of ladder line, just 450
ohm window line of a convenient length. His K1 tuned it a little
roughly on 17m but it works FB there anyway. If I had had more time I
would have changed the feedline length. I used a 1:1 balun, the BL1.
From his QTH in MS I worked K1ZZ Dave, and then a station near my house
in California on 20m. Once I got back, we had no trouble working each
other on 40, 30, or 17m.
73,
Leigh/WA5ZNU
On Sat, 2 Dec 2006 5:58 am, John Meade wrote:
I was reading the ARRL's "Wire Antenna Classics" and noticed an
interesting antenna (not that all of them aren't interesting hi hi).
This was an article by G0FAH called "Four Bands, Off Center" (p 1-13,
also from QST, Feb 1996).
It is a 69-foot antenna with the feedpoint 23 feet from one side and 46
feet from the other. From the antenna to the balun is either 55 or 111
feet of 450-ohm line, or, 50 or 110 feet of 300-ohm line. From the
balun to the rig is any length of 50-ohm coax.
For 40, 20, and 10 meters, the balun is 4:1. For 15 meters, the balun
is 1:1. According to the article, no tuner is needed.
Since the BL2 has a switch for 4:1 or 1:1, this may be an application
without an antenna tuner.
There is no mention of 30m, so that is an unknown. Another unknown
might be the matching with respect to height above ground.
By the way, I bought a blank BL2 PC board and switch from Elecraft and
made my BL1 into a switchable 4:1 or 1:1 balun.
72,
John W2XS
K2 #1116
KX1 #15
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