Summary: Tower Help + some tips from Bravo
Ai7b at teleport.com
Ai7b at teleport.com
Thu Feb 15 08:46:35 EST 1996
the WORST thing about r25 in my opinion is that it is a pain in
a** to stand and work on especially in the mast area (which is
where most of the work is done!! in my caase my shoes are size
12EE....with the mast in the middle and feedlines/rotor cable on
the the inside of the tower their is damm little room for my feet!
they do not fit together on the same rung!! i often climb r25 with
a tower leg btwn my legs and each foot on a separte rung.
i wind up in akward and uncomfortable positions on r25. also,
if you use a pipe vs a flat top section ur in for even more
misery trying to reach ur beams cuz the pipe top has abt 2 ft of
area at the top that u cannot stand on. flat top and 2 thrust
bearings are a must for any kind of a tall mast with more than
one beam on it.
] you shud be able to remove a busted rotor without without
tryin to figure out wat the hell to do wid a mast holding two or
more beams supported by one thrust bearing...this situation can
get real hairy and many fail to think about as they plan their
installation......a second thrust bearing is one of the best
investments you can make in ur installation!
73's de bravo
>From tom georgens" <tom=georgens%Eng%OpenSys at fishbowl02.lss.emc.com Thu Feb 15 17:27:27 1996
From: tom georgens" <tom=georgens%Eng%OpenSys at fishbowl02.lss.emc.com (tom georgens)
Date: Thu, 15 Feb 96 12:27:27 -0500
Subject: Tower Help
Message-ID: <vines.vc59+xnq6lA at fishbowl02.emc.com>
I was reading the February 1 issue of Datamation when I noticed the
picture of famed contester KM3T on page 49. If you hear him running at
150/hour this weekend be sure to stop by and talk to him about the
article.
73, Tom W2SC
w2sc at emc.com
>From Edward B Luers" <Edward.B.Luers at jpl.nasa.gov Thu Feb 15 17:44:11 1996
From: Edward B Luers" <Edward.B.Luers at jpl.nasa.gov (Edward B Luers)
Date: 15 Feb 1996 09:44:11 -0800
Subject: Dentron Documentation
Message-ID: <07083312370EB00D*/c=us/admd=telemail/prmd=nasa/o=jpl/ou=ccmail/s=Luers/g=Edward/i=B/@MHS>
I am in need of the documentation associated with the Dentron 160-10AT antenna
tuner. If any one has this document I would like to obtain a copy. My fax
number is 818 393-2606.
I know this is not the proper place to post my need, but contests are a coming.
73 Ed
Ed Luers KE6SU
voice 818-354-6912
>From Keith Morehouse-WB9TIY <blckhole at ripco.com> Thu Feb 15 20:28:42 1996
From: Keith Morehouse-WB9TIY <blckhole at ripco.com> (Keith Morehouse-WB9TIY)
Date: Thu, 15 Feb 1996 12:28:42 -0800
Subject: [Fwd: Briefing Directly Linking Solar Storms to Disruptions on Earth]
Message-ID: <3123977A.53A6 at ripco.com>
This is a multi-part message in MIME format.
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Here's something from NASA which is certainly contest related. Maybe
we'll all have access to near real time solar event info one of these
days !
---------------------------###-----------------------------
PROBE ELECTRONICS 100 Higgins Road, Park Ridge IL 60068 USA
Keith J. Morehouse / WB9TIY / Society of Midwest Contesters
847-696-2828 FAX: 847-698-2045 e-mail: blckhole at ripco.com
---------------------------###-----------------------------
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Subject: Briefing Directly Linking Solar Storms to Disruptions on Earth
Date: Wed, 14 Feb 1996 17:16:09 -0500
From: NASANews at luna.osf.hq.nasa.gov (NASA HQ Public Affairs Office)
To: press-release-com2 at mercury.hq.nasa.gov
Don Savage
Headquarters, Washington, DC February 14, 1996
(Phone: 202/358-1547)
Diane Ainsworth
Jet Propulsion Laboratory, Pasadena, CA
(Phone: 818/354-5011)
NOTE TO EDITORS: N96-9
BRIEFING DIRECTLY LINKING SOLAR STORMS TO DISRUPTIONS ON EARTH
New findings, beneficial to the telecommunications
and power industries in preparing for huge geomagnetic
storms, will be the topic of a press briefing to be held 3
p.m. EST Thursday, Feb. 15, 1996, at NASA's Jet Propulsion
Laboratory (JPL), Pasadena , CA. The briefing will be
carried live on NASA TV, with two-way question-and-answer
capability from participating NASA Centers.
The findings are the result of data from the
Japan/U.S. Soft X-Ray Telescope on board the Yohkoh
spacecraft and studies from the power industry. The
findings were presented at an international gathering of
solar physicists, power and utilities representatives and
members of the Department of Energy national laboratories,
held this week at JPL and sponsored by the American
Geophysical Union and the National Science Foundation.
Participants in the briefing will be Hugh Hudson,
University of Hawaii; John Kappenman, Minnesota Power;
Douglas Hamilton, University of Maryland. Bruce Tsurutani,
JPL, will be the moderator.
Among the significant results being reported:
* Scientists using data from the Yohkoh satellite
have been able to draw a direct link between a dimming
process occurring in the Sun's corona which results in huge
flares causing electrified particles to wash over Earth.
Scientists predict they can now provide as much as 50 to 70
hours advance warning of these solar storms. That warning
can give industries time to prepare vulnerable systems for
the solar storm.
* The power industry has been able to directly
link major geomagnetic storms with severe disruptions at
power plants from Maine to California. This correlation
could allow the industry to monitor the beginnings of storms
on the Sun and prepare transmitters and power grids for the
onset of these storms on Earth.
* Ionized oxygen is the culprit in creating huge
energized rings in Earth's ionosphere just before the
onslaught of a geomagnetic storm. Knowing the composition
of these highly energized rings is allowing scientists to
better understand when they occur in the 11-year solar cycle
and to anticipate periods of high energy activity.
* Understanding the nature of very high energy
electrons will allow engineers to safeguard future
spacecraft in high radiation environments with better
protective shielding.
NASA is also a participant in the International
Solar-Terrestrial Physics (ISTP) program, involving a number
of satellites which will help scientists better understand
the Sun, leading to the ability to predict and provide
advance warning of solar storms affecting the Earth. Next
launch in the series is NASA's Polar spacecraft on February 22.
- end -
NASA press releases and other information are available
automatically by sending an Internet electronic mail message
to domo at hq.nasa.gov. In the body of the message (not the
subject line) users should type the words "subscribe
press-release" (no quotes). The system will reply with a
confirmation via E-mail of each subscription. A second
automatic message will include additional information on the
service. NASA releases also are available via CompuServe
using the command GO NASA.
--------------3546508A55B1--
>From Ted Brattstrom <ted at hawaii.edu> Thu Feb 15 19:56:09 1996
From: Ted Brattstrom <ted at hawaii.edu> (Ted Brattstrom)
Date: Thu, 15 Feb 1996 09:56:09 -1000
Subject: ARRL DX Contest Rules
Message-ID: <96Feb15.095610hwt.464501 at uhunix3.its.Hawaii.Edu>
from:
From: Pete Smith <n4zr at ix.netcom.com>
Subject: ARRL DX Contest Rules
I just got off the phone with Billy Lunt at ARRL. The bottom line -- there
is no change. W-VE contacts don't count in either direction.
===
please note that Hawaii is not W-VE for the purposes of this contest....
(how you figure???) so we can work you for WAS-1 :-) :-)
I always have trouble figuring out the contests, in one contest the DX
can't talk to us, in others they can.... but we can always talk to the
mainland.... :-)
aloha - ted - nh6yk
>From David Clemons <dave at egh.com> Thu Feb 15 20:33:48 1996
From: David Clemons <dave at egh.com> (David Clemons)
Date: Thu, 15 Feb 1996 15:33:48 -0500
Subject: TailTwister Rotor Problems
Message-ID: <Pine.3.89.9602151505.A18614-0100000 at newman.egh.com>
Hi,
I have a TailTwister which is mounted inside Rohn 45 clone, using
a thrust bearing, and turning a 4-el Cushcraft 20 Meter yagi and a 2-el
Cushcraft 40 Meter yagi. The rotor is 11 years old, but has only seen
service for about 7 of those years.
A couple weeks ago (during a 50 mph windstorm), I was
disappointed to see my antennas swinging back and forth in a 90 degree
arc. So, I climbed the tower (windstorm and all, as no sane human being
would do - but as most other serious hams have probably also done) and
checked out the situation. I was quite surprised to see the rotation
being done at the center of the rotor (where normal rotation is done).
This leads me to believe that the brake wedge is broken, or that the
brake slots are stripped out for that 90 degree arc.
This seemed like a premature death for the rotator, especially
since the wind load total is only about 15 sq. feet. Has anyone else had
similar problems with TailTwisters? I was quite happy with this rotator
until this problem. I also went out and bought the new Yaesu rotator
(forget the model number, but it has similar wind load and almost similar
pricing as the TailTwister). I was intrigued at the idea of braking via
the gears its uses (sort of like trying to turn a gear box from the wrong
end, I guess) and also was surprised to see it uses a DC motor.
Any thoughts on the cause of the TailTwister's untimely death?
It did successfully weather a 100 mph hurricane and an 80 mph hurricane a
few years back. I also would appreciate any thoughts on the Yaesu model
- it is probably not too late for me to exchange it for another
TailTwister if I made a bad choice.
Please answer directly to DAVE at EGH.COM, and I will post a summary
to this reflector.
73, Dave Clemons K1VUT
>From biss at epg.nist.gov (Robert Biss) Thu Feb 15 16:02:16 1996
From: biss at epg.nist.gov (Robert Biss) (Robert Biss)
Date: Thu, 15 Feb 1996 16:02:16 +0000
Subject: Hustler 5BTV ?
Message-ID: <Q1239F59 at washer>
Since none of my antenna's are up yet at the NEW QTH and there is a CONTEST
this weekend I must resort to drastic measures.
I've come across a Hustler 5BTV (I think) vertical w/o an instruction
manual.
Can anyone give me the CW dimensions for this thing!
I'd like to work something other than 40M, which I have a dipole up for.
Many thanks in advance.
I can give a FAX number if someone has that capability.
Again, Many Thanks. es 73's bob K3ZNV
BISS at EPG.NIST.GOV
>From Del Seay <seay at alaska.net> Thu Feb 15 20:46:20 1996
From: Del Seay <seay at alaska.net> (Del Seay)
Date: Thu, 15 Feb 1996 12:46:20 -0800
Subject: ARRL DX Contest Rules
References: <96Feb15.095610hwt.464501 at uhunix3.its.Hawaii.Edu>
Message-ID: <31239B9C.79C1 at alaska.net>
Ted Brattstrom wrote:
>
> from:
> From: Pete Smith <n4zr at ix.netcom.com>
> Subject: ARRL DX Contest Rules
>
> I just got off the phone with Billy Lunt at ARRL. The bottom line -- there
> is no change. W-VE contacts don't count in either direction.
> ===
>
> please note that Hawaii is not W-VE for the purposes of this contest....
> (how you figure???) so we can work you for WAS-1 :-) :-)
>
> I always have trouble figuring out the contests, in one contest the DX
> can't talk to us, in others they can.... but we can always talk to the
> mainland.... :-)
>
> aloha - ted -
Most contests (not all) refer to the IARU contry status. KH^ is a
seperate DXCC country, as is KL7, so in most instances, we are "DX".
Another reason for using the portable designator when operating out
of your "Country".
-- de KL7HF--
>From Del Seay <seay at alaska.net> Thu Feb 15 20:46:39 1996
From: Del Seay <seay at alaska.net> (Del Seay)
Date: Thu, 15 Feb 1996 12:46:39 -0800
Subject: ARRL DX Contest Rules
References: <96Feb15.095610hwt.464501 at uhunix3.its.Hawaii.Edu>
Message-ID: <31239BAF.39C3 at alaska.net>
Ted Brattstrom wrote:
>
> from:
> From: Pete Smith <n4zr at ix.netcom.com>
> Subject: ARRL DX Contest Rules
>
> I just got off the phone with Billy Lunt at ARRL. The bottom line -- there
> is no change. W-VE contacts don't count in either direction.
> ===
>
> please note that Hawaii is not W-VE for the purposes of this contest....
> (how you figure???) so we can work you for WAS-1 :-) :-)
>
> I always have trouble figuring out the contests, in one contest the DX
> can't talk to us, in others they can.... but we can always talk to the
> mainland.... :-)
>
> aloha - ted -
Most contests (not all) refer to the IARU country status. KH^ is a
seperate DXCC country, as is KL7, so in most instances, we are "DX".
Another reason for using the portable designator when operating out
of your "Country".
-- de KL7HF--
>From kf3p at cais.cais.com (Tyler Stewart) Fri Feb 16 00:20:07 1996
From: kf3p at cais.cais.com (Tyler Stewart) (Tyler Stewart)
Date: Thu, 15 Feb 1996 19:20:07 -0500
Subject: Pointing a stack different headings
Message-ID: <199602160020.TAA19088 at cais.cais.com>
>
>Woah.... hold on here...
>
>John, W0UN, wrote:
>
>>Actually it is a little more complex than all of this (isn't life like that)
>>because of the changes in mutual coupling, etc. But for a first
>>approximation (read guess) you can spray two directions knowing that 1/2
>>your power is going in a second direction and that power is having little
>>effect on the half that is going in the first direction.
>
>John and co. - I think you have the essentials correct - especially
>the first part of the above statement and the rest of your posting.
>But I would not take even as a zero-th approximation the second part
>of the above statement. Consider this: First, unless the "stacked"
>antennae are many wavelengths apart each will ALWAYS be in the near
>field of the other. Therefor, you can never consider the pair (or
>mulltiplet) as sepreate antennae. You must evaluate the sum total of
>amplitude and phase of the radiation patterns, which will be very
>different than the scalar sum of the patterns that would sugest that
>you can spray two dirrections equally. This is basic physics, and is
>the way it is. Secondly, as you point out, some arbitrary point a
>very long ways off doesn't "know" there are two antennae at a given
>QTH. This only underscores my first point.
>
>I have not modeled this specifically, but think how the wakes of two boats
>moving in different directions interact on the watter - especially when
>they are just within several boat lengths from each other.
>
>Just my two cents worth - for what it's worth...
>cheers, Chuck Claver, PhD.
> de NJ6D
I've done lots and lots of modeling with AO of 5 el stacks with yagi's
pointed in different directions and, as long as they are pointed in distinctly
different directions, so that their front lobes are not crossed, there is
essentially no interaction worth talking about. Again, we are talking
PRACTICAL and not 20 db down!
Because the C3 is only 2 elements, this interaction might be more s
substantial because it isnt going to have the tighter pattern of even a 3 el.
monobander. I really dont understand why you would want to rotate a whole
stack of C3's separately but that's up to you.
73, Tyler
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