[SixClub] Re: [50mhz] FS: new 6M 1.5wl yagi, stack match, plus some other goodies

[jeremy-ca]

The OWA concept has been around a long time before Cebik's article and I 
first read of it in German and US UHF articles highlighting very high 
performance 432 mHz arrays that could perform under all weather conditions. 
This was back in the 80's.

My own experience was taking a 6 el Cushcraft boomer and spending some 
serious YO and NEC time on it. The end result was 8 elements with 11.1 dBd 
at 50.1 mHz with a 37 to 42 dB complete 180* f/r up to 50.5 mHz and an 
almost flat VSWR curve over that range. It has been in operation for 17 
years and is a proven performer chasing DX, contesting or yakking on 50.4 
AM.
Snow and ice has no noticable effect.

I also have 28' boom 432 antennas built to this criteria and have redesigned 
several other commercial 6M yagis for others that exhibit similar 
performance results.

Carl
KM1H


----- Original Message ----- 
From: "Gary - N3JPU" <n3jpu at speakeasy.net>
To: "'World Wide Six Meter Club'" <sixclub at mailman.qth.net>; 
<50mhz at mailman.qth.net>; "'VHF Reflector'" <vhf at w6yx.stanford.edu>
Sent: Saturday, March 03, 2007 5:02 PM
Subject: [50mhz] FS: new 6M 1.5wl yagi, stack match, plus some other goodies


Put up a new 60' tower and new antenna for 6M. Originally planned to stack a
pair of the 1.5wl yagis but did not realize how robust the Force12 antennas
are so settled on just one of them. This is a OWA design on a 30' boom.
Check out Cebik's articles on the OWA design for VHF
(http://www.cebik.com/qex/owa.pdf). As I mentioned this is a very robust
antenna. Elements are .75" for the 12" center section, tapering to .625" for
18" then to .5" tips. The boom is 2" diameter end to end with the walls
being .125" except for the 6' end pieces being .058". The design calls for
no truss. I have modeled this with MultiNEC and YW and it's right on what
Force12 claims as true gain of 10.6dBd and 25dB FB. SWR curve is very broad
which came in handy last week when we had a heavy and wet snowfall. My
EF-906's SWR did not budge when there were M2's in the area that were
unusable.

Being a OWA design it uses a split driven element and I have for it a new
high quality Array Solutions W1JR 1:1 balun with N connector.

I have not had any openings yet since I put my other EF-906 up but I do work
regularly from FM19lc up into FN32 with QSO's that span an hour or more.
That is 325 miles and I am only using 100W.

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New in the box:
Force12 EF-906 30' 10.6dBd Lists for $599.00
http://force12inc.com/F12-6mtr-info-001.htm

Array Solutions W1JR-50-3N Balun N Lists for $94.75
http://www.arraysolutions.com/Products/baluns.htm#5%20kW%20Balun

Array Solutions BMP-4 Mounting Plate Lists for $14.00
http://www.arraysolutions.com/Products/baluns.htm#Mount

DX Engineering DXE-SAD-200A 2" Saddle Clamp Lists for $8.40

Asking $600 for all above.

----------------------------------------------------------------------------
-

New and never used:
Array Solutions Mini-Stack Match 6M with N connectors. List for $148.
Asking $130
http://www.arraysolutions.com/Products/stackmatch.htm#MiniStackMatch

----------------------------------------------------------------------------
-

New and never used:
Yaesu GS-065 Thrust Bearing (Mast Diameter 1 1/2 - 2 1/2") List for
$59. Asking $45
http://www.heightstowers.com/rotators.htm

----------------------------------------------------------------------------
-

Gary Mitchelson
N3JPU Montgomery Co. MD  FM19
USAF MARS and SHARES: AFA1PU
MD/DC State USAF MARS Director AFF1MD
USAF MARS Technical Services Manager AFN1TS
http://www.mitchelson.org/



Moderator: Ray Brown, KB0STN
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