[Antennas] RE: multiple dipoles \ one feed

Wed, 31 Jul 2002 22:54:43 +0600

I did not find the original question but having used trap dipole (3 band)  I
now got trapless 3 band dipole that sure works much better. It is not fan
dipole though.
It is 20m dipole fed with coax and 15m and 10m spaced some 0.07-0.10 m from
the 20m dipole and not electrically connected to the 20m dipole. This system
has close to 50 ohm impedance on all 3 bands and no loss in traps. In fact
it has a bit better gain according to the model on 10 and 15 then single
band dipoles.
It is also veru easy to home brew. I have been using it now for more then 2
years as a supplement to my A3S and it is very helpful in the contests.

Igor
UA9CDC

> Not only tidier but keeps the broadside lobes pointing in the same
> directions on all bands. The fan dipole usually requires the individual
> dipoles to be separated from one another and that results in each dipole
> "pointing" in a different direction from the others.
>
> You pay with some loss in the traps and reduced SWR bandwidth, neither of
> which may be very important.
>
> 73/72/oo, George W5YR - the Yellow Rose of Texas
> Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> Amateur Radio W5YR, in the 56th year and it just keeps getting better!
> QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
> Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437
>
>
> Karl Kanalz wrote:
> >
> > Sure it will work, Ed, but I'd make it a multi-band trap antenna, rather
> > than make a "fan" dipole(s)
> > arrangement.  Much tidier that way....
> >
> > Karl K - W8TIF
> > McKinney, Texas
> >
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>
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