You wont get 3dB at best for a 3 element yagi on 20m using a 30'
spacing is 2.5dB max. Add in an additional say 20' of cable say rg213
and you will have more loss. say another .25dB.
That assumes there is no VSWR loss.
I currently have 2 6 element tribanders at 71 and 39' stacked
I use 25' RG213 to feed both and a simple switch. I do not adjust for VSWR
you can get a stackmatch form WX0B
Yes I pick up about 2.5 dB gain but what's more important
is the take off angle and reduced fading.
Besides stacking 2 24' antenna is a lot easier than trying to keep a 60'
boom one up
and you have the ability to split the stack if designed right
David Jordan, Pr. Antenna Engineer
> Automotive Telematics and Commercial Antenna
> M/A-COM, A tyco INTERNATIONAL LTD. COMPANY
> 1011 Pawtucket Blvd. Lowell, MA 01853, MS 158
> ph: 978-442-4190 fx: 978-442-5419
> jordand@tycoelectronics.com
> www.macom.com
>
>
>From ka5nez@clarc.org Fri May 30 12:50:16 2003
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From: "Ken \"AB5A\" Eckel Jr." <ka5nez@clarc.org>
To: "MEL WOODY" <N7LYY@EFFECTNET.COM>, <towertalk@contesting.com>
Subject: RE: [TowerTalk] High Sierra or Tarheel
Date: Fri, 30 May 2003 11:50:13 -0500
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Mel,
Great glowing report but for what?
73,
Ken AB5A
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com]On Behalf Of MEL WOODY
Sent: Friday, May 30, 2003 9:56 AM
To: towertalk@contesting.com
Subject: [TowerTalk] High Sierra or Tarheel
From: <DRIVERTRR@aol.com>
To: <n7lyy@effectnet.com>
Subject: antenna
Date: Friday, December 27, 2002 9:26 PM
Dear Mel,
My name is Teddy[AE4PM] I purchased an antenna from you well
over 2 years ago.I have used the antenna on my tractor-trailor since day
one.I have had it on 2 different trucks now.According to my records it has
over 250,000 miles on it.The majority of the time I have ran around 400-500
watts thru it.I have been well pleased and would recommend your antenna to
anyone.I plan on purchasing another one soon for a back-up. I have
experimented with many antennas and not have had any that would hold up to
the punishing elements of trucking hf.Thanks Mel for a well built
antenna.Yours has been tried and proven.
Teddy Rose AE4PM
From: "Dave Frechette" <k7qt@pacbell.net>
To: "MEL" <N7LYY@EFFECTNET.COM>
Subject: New Antenna
Date: Wednesday, November 13, 2002 2:59 PM
Just to let you know that I installed the new screwdriver antenna and
connected
everything up and that it works better than I had ever expected! It
outperforms
everything I have used in the past other than frequency specific antennas.
This unit stays on the setting and does not crank down on itself, regardless
of speed or road condition, and tunes virtually flat from 160 to 10 meters.
Sure beats the hell out of my old HS100 and SG 230/303 setups!
Keep up the good work!
Dave, K7QT
From: "Dr. Harold Wingo" <hwingo@cybersurf.de>
To: "MEL WOODY" <N7LYY@EFFECTNET.COM>
Subject: Antenna
Date: Monday, October 21, 2002 3:35 PM
Mel . . .
I received my antenna Saturday!!!!! I LOVE IT!!!!!!!!!!!!!!!!!!!!!!!
Installation was easy and painless!!!!!!! Worked the first time without
pulling my hair out!!!!!!!!!!!!!!!! Straight out of the gate it's been
a real delight and a pleasure doing business with you!!!!!!!!!!!!!!! I
hope the antenna continues to provide me with good service.
Thanks for your workmanship!
Dr. Harold Wingo
KD5DNA
From: "MEL WOODY" <N7LYY@EFFECTNET.COM>
To: "Mel Woody" <n7lyy@effectnet.com>
Subject: antenna
Date: Wednesday, November 13, 2002 9:04 PM
From: ken grossman
To: MEL WOODY
Sent: Wednesday, November 13, 2002 8:59 PM
Subject: antenna
good evening Mel..
i got antenna mounted and hooked up today and i must say i was totally
suprise
... It worked as you advertised on all bands.. It was unbelievable.. I used
the
Mfj analyser and the proof was in the observing.... I was especially
suprised
when i went to 160 meteres..... the antenna brought it in with out any
problems at all.. Mel you have one fine atenna..... Im especially empressed
by
the aluminum mount you used....you defineately have one happy customer here
..
.... I would recommend this antenna highly over any other mobile anttenna i
have tried....
once again thanks for making a great super antenna. Im triping tomorrow so i
plan on giving it a good try...
sincerely
Ken Grossman KG0SQD
http://www.qth.com/n7lyy
GOD BLESS
MEL
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
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