Fan dipoles depend on the relatively high impedance on the fan
pieces that are for other bands to send most of the energy into
the tuned fan. If you are using fans for 40 and 15, the energy
will be split between them on 15M which isn't what you want.
BTW - My combination of a 160M dipole commonly fed with an 80M
inverted V at 90 degrees to the 160M dipole works quite well on
15 meters. The cocoaNEC model shows good performance with 4
major lobes arranged more or less in the direction of the 160M wire.
73 Bill AE6JV
On 9/13/14 at 11:14 PM, wun...@wunderwood.org (Walter Underwood) wrote:
Eh? A 40m dipole is pretty close to resonance on 15m already,
so how can you avoid that. In fact, all dipoles are resonant at
odd multiples of half waves, so this is impossible to avoid.
Could you clarify the issue here?
wunder
K6WRU
CM87wj
http://observer.wunderwood.org/
On Sep 13, 2014, at 10:31 PM, Don Wilhelm <w3...@embarqmail.com> wrote:
I failed to mention another point with regard to fan dipoles. Do not mix 3rd
harmonic radiators on
the same coax. In other words, stay away from combinations of
40 meters and 15 meters, and also 40 meters and 30 meters.
They may work, but tuning problems are 'iffy'.
73,
Don W3FPR
-----------------------------------------------------------------------
Bill Frantz | Since the IBM Selectric, keyboards have gotten
408-356-8506 | steadily worse. Now we have touchscreen keyboards.
www.pwpconsult.com | Can we make something even worse?
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