Hello Joern,
Try this:
www.yu7ef.com all VHF and HF antennas
http://www.yu7ef.com/ef105a.htm 5el on 10m
http://www.yu7ef.com/ef106a.htm 6el on 10m
73' Samir, 7S7V
Message: 3
Date: Mon, 2 Nov 2009 16:54:05 -0500
From: "Bob" <rabisch@hotmail.com>
Subject: Re: [TowerTalk] 10m OWA 24'
To: "Joern DK5TT" <dk5tt@opretzka.de>, <towertalk@contesting.com>
Message-ID: <BAY113-DS9548B685B61DBA03F7B02AFB30@phx.gbl>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
If you change the taper or size of the elements it will change the
performance.
Another possibility would be to start with a Hygain 105CA which is on
a 24' boom. By adding one element you can make it into a 6 element
10 Meter OWA on a 24" boom. Using YW (yagi for windows optimizer
program) you can obtain:
(these numbers assume the antenna is mounted at 32 feet)
Freq (MHz) 28.0 to 29.0
Gain (dBi) 15.54 to 15.84
I/I (dB) 22.4 to 23.03
SWR 1.11 to 1.05
Element Taper (in): 1.045 .875 .625 .438
Element Spacing (in): 0 49 68 133 194 283
I can't recall the dimensions or the reference but someone also came up with
a dummy element made out of PVC to rebalance the beam.
Nice way to eliminate the hairpin and have a flat SWR across 1MHz of the 10M
band.
It all depends on what you have available to work with.
Bob
K4QHH
--------------------------------------------------
From: "Joern DK5TT" <dk5tt@opretzka.de>
Sent: Monday, November 02, 2009 9:13 AM
To: <towertalk@contesting.com>
Subject: [TowerTalk] 10m OWA 24'
> Hi,
>
>
>
> there seems to be a OWA design by NW3Z for a 6 element 10m yagi on a 24'
> boom (with 50 ohms feedpoint impedance).
>
> Unfortunately the OWA website on contesting.com is no longer alive.
>
> Can anybody help me out with the AO file or dimensions?
>
>
>
> Thanks,
>
> Joern
>
>
>
>
>
>
>
>
>
>
>
> _______________________________________________
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