I have moved my Web-Site to http://www.qth.com/k9my If you
have a Java enabled browser such as, Netscape Navigator 3.0
or Microsoft Internet Explorer or AOL 3.0 Browser, you
will be able too view a nifty Java Applet. Javasoft was much
easier too program than I had thought because of its similarty C++
Stop by and check it out.
73/Jerry/K9MY ex WN9JAT
>From tomwagner@mindspring.com (Tom Wagner) Fri Nov 22 10:50:10 1996
From: tomwagner@mindspring.com (Tom Wagner) (Tom Wagner)
Subject: 15" Monitor Survey
Message-ID: <1.5.4.16.19961122055002.1cb7c84e@pop.mindspring.com>
Here is the summary of 15" monitors. Thanks to all
that replied. I hope you get the one you want for
Christmas for your *contest* station!
Tom - N1MM
P.S. I'll probably spend the big bucks and get
the NEC XV15+ -- top-rated by Consumer Reports as
well (July, 1996)
____________________________________________________
Brand Model RFI
------------ ----- ----------------
Packard-Bell VLMF Stinks
NEC XV15 Good - 2 reports
NEC XE15 No noise
NEC ??? Presumably good
NEC 3D no noise - not susceptible to RF (exclnt and rugged)
Viewsonic 15EX Not too bad
Samsung 15GLE A little RFI
MAG ??? Good 15" & 17"
ACER 56L BAD
ACER ??? Is the worst
Gateway 1572DG No RFI, No problems
Dell ??? 160 bad, other bands good (see below)
CTX 1565GM Very quiet
CTX ??? A lot of noise, hard on eyes
Sony 15SFII no RFI, no noise, no nothing
Sony 15SFII very quiet
Sony ??? Less (hearsay)
Compaq 151FS great!
Compaq 150 no noise - wiggles a little when transmitting
Original posting and responses follow
___________________________________________________________________________
There was a thread on 17" monitors, but I am interested
in replacing my 15" Acer 56L monitor. It has too much
rf coming out the front, plus one of the guns is starting
to flake out.
Could you let me know what 15" monitors you like and
dislike for contest use? I am most interested in
rf susceptibility and noise generation, the features
hardest to evaluate at the computer show.
I'll post the results at the end of the week.
Tom - N1MM
P.S. The NEC MultiSync XV15 I borrowed from
work is pretty quiet, but pretty expensive.
___________________________________________________________________________
I have a packard bell VLMF... it might not radiate as many of those harmful rays
that kill your eyes, but it sure stinks on rf. I have done just about everything
one can do to cure it (paint inside with metalized paint, etc) but to no avail.
I now have it set up far enough away ~2-3 feet, that it isn't getting to the rig
now, but boy what a pain to read and operate during the contests.
73,
Al - kk5zx
___________________________________________________________________________
The Viewsonic 15EX seems to be just fine. Not too bad in the
computer/monitor noise department.
Jay Townsend, WS7I < jayt@iea.com >
___________________________________________________________________________
I use a SAMSUNG Syncmaster 15GLe....crisp display, never any RFI incoming,
but maybe a little bit of a RFI generator, but not bad at all....
Don VE6JY
VE6JY is Don Moman email: ve6jy@freenet.edmonton.ab.ca
___________________________________________________________________________
I sure would like to know what you find. The emi/rfi output is especially
key. Got A input from local guy that Sony has less emi/rfi as its power
supply is shielded internally. Not sure if valid, so would like your summary.
73
Rod
w7om@aol.com
___________________________________________________________________________
I use an NEC Multisync. I guess you get what you pay for.
73. Ken, K6LA - Ken Six Los Angeles, KWIDELITZ@DELPHI.COM
ex-AB6FO
___________________________________________________________________________
MAG makes good 15 and 17 inch monitors.
ACER is the worst...
John, K1AE
___________________________________________________________________________
Tom, no problems with my NECX XE15, tho it's expensive. No noise or
problems from RF.
73, Jim N7US
___________________________________________________________________________
Tom:
Perhaps you get what you pay for. After enduring several "economy"
Chinese monitors that generated noise and regularly blew flyback
transfomers, I bit the bullet and bought a NEC Multisync XV15. It sits
right next to my TS930S and is pretty damned quiet. I already had an
older 17" NEC on my Macintosh, 3 feet away and loved it. Good display,
sturdy, no problems. The industry people I have talked to have a simple
refrain: there is NEC, there is SONY...and there is everyone else.
--
Garry Shapiro, NI6T
Editor, The DXer
newsletter of the Northern California DX Club
___________________________________________________________________________
Tom - I have a Gateway 1572DG 15 inch monitor (part of package with
computer). No RFI, no problems.
73
Barry Kutner, W2UP
___________________________________________________________________________
I have a Dell either 14 or 15 inch monitor on my Compaq
386-25 in the shack. I notice it puts out plenty of RFI.
Mostly at these freqs:
160m 1.824 - real bad - notice some RFI from the family TV also
80m only RFI on this band is from the family TV
40m nil
30m nil
20m 14.005 - real bad
17m 18.077 (+/- 2)
15m never really noticed any
12m 24.895 (+/- 5 or so)
10m same as 15
I just reach up and shut it off if something comes thru that I want to
work on any of the freqs listed.
Scott K8SM
___________________________________________________________________________
I use two monitors, a 17' and a 15' CTX.
No RFI from either one - pretty impressive.
The 15' model number is CTX 1565GM - has
two toroids on the video lead factory installed.
I've moved this monitor around to other contest
stations and it's worked fine there - in fact,
I have more trouble with my computer, but that
problem is fairly solved.
The CTX monitors are very very quiet - don't
know what they did to make them that way, but
that's the deal.
Good luck
73
Tom, NM1Q (tomf@neca.com)
___________________________________________________________________________
Hi Tom I am using a CTX 15" model. It causes a lot of noise es
setting close to a 15 inch screen is hard on the eyes. A smaller
screen would be my choice. I have heard that rearranging the power
cord and using clamp on toroids work too but have not tried that yet.
Would appreciate your summary es Happy Holidays to you. Mucho snow
here this morning-pretty unusal for Western Washington. 73 de Bob
K7lay
___________________________________________________________________________
Hello Tom I`am using a Sony 15SFII for about a hear just beside the
amp,sometimes wen hunting for the dx with 1.5 kw I see no RFI no noise no
nothing that I have to report or complain about the monitor image very
clear,nothing bad to report I see every thing on the excellent side,try one
you will be happy.
73 Rui.
VA3WTO one of VA3SK Contest team.
___________________________________________________________________________
Compaq 151FS - great!
E-mail: frenaye@pcnet.com Internet: http://www.akorn.net/k1ki
Tom Frenaye, K1KI, P O Box 386, West Suffield CT 06093 Phone: 860-668-5444
___________________________________________________________________________
I vote for a Sony 15sfII. I got it just before CQWWssb and it is very quiet.
73 de Les KG1D
___________________________________________________________________________
From: "Robert E. Naumann" <kr2j@ix.netcom.com>
I have used 2:
1) The NEC 3D - no noise - not susceptible to RF (excellent and rugged)
2) Compaq 150 - no noise - slightly susceptible to RF (wiggles a
little when transmitting)
___________________________________________________________________________
>From broz@csn.net (John Brosnahan) Fri Nov 22 12:03:49 1996
From: broz@csn.net (John Brosnahan) (John Brosnahan)
Subject: Large Antenna Wind Loading
Message-ID: <199611221302.AA12617@ns-1.csn.net>
At 10:48 PM 11/21/96 -0500, you wrote:
>I have installed a large KLM 6 el. 20M antenna.
>
>I am using the large Create RC5B3 rotator and still have some trouble with
>stalling in heavy wind.
>
>The antenna stalls because the front of the boom is much longer than the back
>and therefore not WIND balanced.
>
>I have heard that someone has discovered how to WIND balance this antenna by
>adding plastic sheet to the boom at the appropriate spot.
>
>Does anyone know how to do this or have the needed information or any other
>ideas on how to solve this problem?
>
>Dennis
>K2UA
>
>
Dave,
Here is the way to simplistically calculate what you need (it only addresses
the issue of the boom itself--not the differences in wind loading from the
hardware
or the end view of the various elements--but it is a good start. You can
calculate the effects of the element-to-boom clamps and other hardware
in a similar fashion, if you are into picking nits.
The KLM 20M-6 has a 31.0 ft boom half and a 26.66 ft boom half. The
difference is 4.33 ft. The area of this in inches is 4.33 ft x 12 in x 3 in
(boom
diameter) x 0.66 (correction factor for round booms) which is 102.88 sqin.
This area is acting from a point in the center of the extra piece (4.33/2 =
2.165)
and this point is 26.66 ft + 2.165 ft = 28.825 from the mast. Multiply this
area times the distance to find the "effect" that must be balanced (not torque,
since we haven't converted this into the appropriate units--and don't need
to, since all we need to do is balance the "effect"--saves some needless
steps). 102.88 sqin x 28.825 ft = 2,965.52 sqinft. Now all we need to do
is mount something of an area that when mounted some distance from the
mast will provide an equal value of sqinft. If using a flat sheet--say 4 inches
by 36 inches (144 sqin--round correction factor not appropriate for the flat
object) this needs to be mounted with its center at 20.59 ft from the mast
on the 26.66 ft side of the boom (2,965.52/144 = 20.59 ft)
Say you want to stick the wind vane balance sheet centered between the reflector
and the top guy bracket, this would allow for a piece that isup to about 48
inches
long (with enough extra space to clear the clamp and element bracket--the
center to
center spacing between them is 54 inches). The mid-point between the reflector
(26' 6" from the mast) and the top guy bracket (22' 0" from the mast) is 24' 3"
or 24.25 ft. 2,965.52/24.25 = 122.29 sqin. If you use a flat plate that
is 3 inches wide then you need a piece that is 122.29/3 = 40.763 inches long.
(or if you use something that is mounted with its center in the same place
but is
6 inches wide then it only needs to be half as long).
Think this illustrates the technique. Didn't double check the numbers
(trying to
get ready for CQWW) but you get the idea, I trust.
73 John
John Brosnahan W0UN
24115 County Road 40
La Salle, CO 80645
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