[TowerTalk] TowerTalk Digest, Vol 83, Issue 6

[Samir Popaja]

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 at hotmail.com>
Subject: Re: [TowerTalk] 10m OWA 24'
To: "Joern DK5TT" <dk5tt at opretzka.de>,	<towertalk at contesting.com>
Message-ID: <BAY113-DS9548B685B61DBA03F7B02AFB30 at 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 at opretzka.de>
Sent: Monday, November 02, 2009 9:13 AM
To: <towertalk at 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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> http://lists.contesting.com/mailman/listinfo/towertalk
> 

 

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