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1994-11-13
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Date: Sun, 15 May 94 04:30:15 PDT
From: Ham-Ant Mailing List and Newsgroup <ham-ant@ucsd.edu>
Errors-To: Ham-Ant-Errors@UCSD.Edu
Reply-To: Ham-Ant@UCSD.Edu
Precedence: Bulk
Subject: Ham-Ant Digest V94 #143
To: Ham-Ant
Ham-Ant Digest Sun, 15 May 94 Volume 94 : Issue 143
Today's Topics:
GOPHER archives for rec.radio.amateur.[antenna|homebrew],QRP
Loaded LPDA?
looking for interdigital filters
Loop Skywire
Radar
radar detectors
Telescoping Mast Advice Sought
Send Replies or notes for publication to: <Ham-Ant@UCSD.Edu>
Send subscription requests to: <Ham-Ant-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Ham-Ant Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/ham-ant".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: 14 May 1994 23:54:52 GMT
From: ihnp4.ucsd.edu!swrinde!gatech!concert!bigblue.oit.unc.edu!sunSITE!modena@network.ucsd.edu
Subject: GOPHER archives for rec.radio.amateur.[antenna|homebrew],QRP
To: ham-ant@ucsd.edu
Advisory on GOPHER-accessible archives of:
rec.radio.amateur.antenna
rec.radio.amateur.homebrew
QRP@Think.com
Subject-threaded articles from the above mentioned topics can be read
via GOPHER (and presumably MOSIAC and WWW). Individual articles can
be retrieved via the built-in email mailer (press 'm' to pop the menu).
One can assess these archives in one of two ways:
1. Via your local GOPHER client
2. Telnet to the public GOPHER server at SunSITE.
At the present time, simple FTP access to these archives is not possible.
1. Use the following profile to point your local GOPHER client to
the appropraite part of sunsite.unc.edu:
+----------------------------------------------------------------------+
#
Type=1+
Name=Electronics & Computers
Path=1/../.pub/academic/agriculture/agronomy/electronics+computers
Host=calypso-2.oit.unc.edu.
Port=70
Admin=Jonathan Magid and Simon Spero, 919-962-9107 <ftpkeeper@sunsite.unc.edu>
ModDate=Sat May 14 16:54:22 1994 <19940514165422>
URL: gopher://calypso-2.oit.unc.edu.:70/11/../.pub/academic/agriculture/
agronomy/electronics+computers
+----------------------------------------------------------------------+
NOTE: The URL: line was too long to send on Usenet. Join the line
subsequent to the URL: line back to the URL: line before putting the
profile item in your .link file.
The GOPHER directory will look like this:
Internet Gopher Information Client 2.0 pl11
Electronics & Computers
1. Ham Radio Callbook Server - SUNY at Buffalo <TEL>
---> 2. Archives of rec.amateur.radio.ANTENNAS /
3. Archives of rec.radio.amateur.HOMEBREW /
4. Archives of QRP ... threaded from Think.com /
5. Archives of sci.ELECTRONICS /
6. . . . . other HAM RADIO related items /
7. OS2: an FAQ, the IBM Gopher and other trivia /
8. COLEM /
9. NEC /
2. TELNET to a GOPHER server (an example session)
>telnet sunsite.unc.edu
Trying 198.86.40.81 ...
Connected to sunsite.unc.edu.
Escape character is '^]'.
***************** Welcome to SunSITE.unc.edu *****************
SunSITE offers several public services via login. These include:
For a simple gopher client, login as gopher
.....
Internet Gopher Information Client 2.0 pl11
Root gopher server: gopher.unc.edu
--> 5. Worlds of SunSITE -- by Subject/
.....
Internet Gopher Information Client 2.0 pl11
Worlds of SunSITE -- by Subject
--> 3. Browse All Sunsite Archives/
.....
Internet Gopher Information Client 2.0 pl11
Browse All Sunsite Archives
--> 8. academic software written by researchers in different disci.../
.....
Internet Gopher Information Client 2.0 pl11
academic software written by researchers in different disciplines
--> 3. agriculture information about scientific farming, horti.../
.....
Internet Gopher Information Client 2.0 pl11
agriculture information about scientific farming, horticulture, and .../
--> 3. agronomy/
.....
Internet Gopher Information Client 2.0 pl11
agronomy
--> 8. Electronics & Computers /
.....
Internet Gopher Information Client 2.0 pl11
Electronics & Computers
1. Ham Radio Callbook Server - SUNY at Buffalo <TEL>
--> 2. Archives of rec.amateur.radio.ANTENNAS /
3. Archives of rec.radio.amateur.HOMEBREW /
4. Archives of QRP ... threaded from Think.com /
5. Archives of sci.ELECTRONICS /
6. . . . . other HAM RADIO related items /
7. OS2: an FAQ, the IBM Gopher and other trivia /
8. COLEM /
9. NEC /
--
73/Steve Modena/AB4EL MODENA@sunsite.unc.edu
ham-radio gopher advisory/version 1.0.0/14 May 94
------------------------------
Date: 14 May 94 12:56:40 GMT
From: dog.ee.lbl.gov!agate!iat.holonet.net!vectorbd!jpll@ucbvax.berkeley.edu
Subject: Loaded LPDA?
To: ham-ant@ucsd.edu
Todd Little (little@iamu.chi.dec.com) wrote:
: Would it be possible to somehow load the last 2-3 elements that would be
: active on 18 and 20 meters to short them to 15 meter dimensions? Has
: anyone built such an antenna?
I believe that the phase realtionships (that of the waves) between the loaded
and unloaded elements would not be right and would not work
--
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-Jim Lill- Vector Board BBS
jpll@vectorbd.com 716-544-1863/2645
wa2zkd@wb2psi.#wny.ny.usa.na GEnie: ZKD
------------------------------
Date: 12 May 94 22:34:50 +0930
From: ihnp4.ucsd.edu!munnari.oz.au!foxhound.dsto.gov.au!fang.dsto.gov.au!dstos3.dsto.gov.au!mwf@network.ucsd.edu
Subject: looking for interdigital filters
To: ham-ant@ucsd.edu
hello all
This is my first question to this group, I hope someone may be able to
help.
I am looking for a program to design interdigital filters.
dos based much prefered.
mwf@victor.erl.dsto.gov.au
------------------------------
Date: Thu, 12 May 94 16:15:00 EDT
From: newshub.sdsu.edu!nic-nac.CSU.net!usc!howland.reston.ans.net!europa.eng.gtefsd.com!news.msfc.nasa.gov!news.larc.nasa.gov!lerc.nasa.gov!kira.cc.uakron.edu!malgudi.oar.net@ihnp4.ucsd.edu
Subject: Loop Skywire
To: ham-ant@ucsd.edu
-----BEGIN PGP SIGNED MESSAGE-----
zlau@arrl.org (Zack Lau (KH6CP)) writes:
> Jim Grubs, W8GRT (jgrubs@voxbox.norden1.com) wrote:
>
> : > One thing to be carful of is to make it as close to a square as possible.
> : > far from a square and it starts to exhibit some sharp lobes, depending on
> : > exact configuration and frequency, height, etc. Actually, I think a circl
> : > would be best but that's pretty hard to do for most of us. Mine was withi
> : > few feet of being square.
> :
> : I saw a loop demo at Dayton 10 or 12 years ago that pretty well
> : proved that loop shape doesn't make a darn bit of difference if
> : the circumference is << lambda/2.
>
> True, for very small loops the shape doesn't affect the pattern, though
> I can think of some shapes that could increase the losses.
>
> However, the loop being discussed is a full wavelength at the lowest
> frequency, and multiple wavelenths at harmonic frequencies.
Aren't there phase shift problems for circumferences > lambda/2
?
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/--------------------------------------------------------------------------\
| Jim Grubs, W8GRT Voxbox Enterprises Tel.: 419/885-2814 |
| jgrubs@voxbox.norden1.com 6817 Maplewood Ave. Fax/Data: 419/885-2905 |
| Fido: 1:234/1.0 Sylvania, Ohio 43560 Home: 419/882-2697 |
| AMATEUR RADIO - The National Park of the Mind |
\-+------------------------------------------------------------------------/
------------------------------
Date: 13 May 1994 08:59:35 -0700
From: nntp.crl.com!crl.crl.com!not-for-mail@decwrl.dec.com
Subject: Radar
To: ham-ant@ucsd.edu
Thats what I would do - Make a receiver to DETECT the local osc. of the
radar unit you want to monitor. You can do the same for their radios but, its
going to be better for the radar (less false detections), due to lesser amt.
of units in the field. VHF/UHF radios everywhere.
--
Joseph Stroup
------------------------------
Date: 14 May 1994 16:06:04 GMT
From: ihnp4.ucsd.edu!agate!doc.ic.ac.uk!uknet!bnr.co.uk!corpgate!bnrgate!bmerha64.bnr.ca!news%bmerha64@network.ucsd.edu
Subject: radar detectors
To: ham-ant@ucsd.edu
In article <2qr9bd$nkg@agate.berkeley.edu>
kennish@kabuki.EECS.Berkeley.EDU (Ken A. Nishimura) writes:
[snip]
> Hmm, Canada, eh? They ban those puppies out there, no?
Not in New Brunswick. Ontario and Quebec have passed laws
prohibiting their use, though.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fred M. Davis VA3FD | These opinions are mine and are not
Northern Telecom Ltd. | necessarily those of the company
Semiconductor Components Group | fmdavis@bnr.ca
Nepean, ON. | va3fd@k9iu.ampr.org
| freddy.davis@lambada.oit.unc.edu
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
------------------------------
Date: 13 May 1994 00:06:11 GMT
From: parc!biosci!agate!howland.reston.ans.net!europa.eng.gtefsd.com!newsxfer.itd.umich.edu!csd475b!newsserv!majewski@decwrl.dec.com
Subject: Telescoping Mast Advice Sought
To: ham-ant@ucsd.edu
Hello to all!
I am thinking about buying a Rohn H-50 telescoping mast for use
on Field Day.
Does anyone have first or second-hand experience with this unit?
Did you think it was well made? Do you have any hints/kinks to offer?
Assuming light antenna loading, can you get away with guying every
other section rather than every section? (I know this month's QST
article recommends the latter)
Are rope guys enough for FD?
I'd appreciate any and all information you can share.
Thanks and 73!
Ron (wb8ruq).
majewski@erim.org
--
Ron Majewski (majewski@erim.org)
The Environmental Research Institute of Michigan
------------------------------
Date: 14 May 94 14:26:53 GMT
From: dog.ee.lbl.gov!agate!iat.holonet.net!vectorbd!jpll@ucbvax.berkeley.edu
To: ham-ant@ucsd.edu
References <2pceka$k74@portal.gmu.edu>, <2pfp6r$475@search01.news.aol.com>, <cleveland.1117950484A@gold>
Subject : Re: portable antenna for NVIS?
Grover Cleveland (cleveland@gvg47.gvg.tek.com) wrote: : >In article
<2pceka$k74@portal.gmu.edu>, drickers@mason1.gmu.edu (Donald E :
>Rickerson) writes: : > : >>I am looking for aportable antenna to use with
a Near Vertical Incident : >>Skywave antenna that works with a adaptive HF
radio, ALE. It has to be : >>a broadband antenna that can be erected by
semi-skilled operators.
try a B&W broadband Dipole in an inverted vee mode. Metal support is
alleged to be taboo but works OK. The B&W is okay in eff down to 4 or so
Mc then gets lossy. Still usable however.
--
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-Jim Lill- Vector Board BBS
jpll@vectorbd.com 716-544-1863/2645
wa2zkd@wb2psi.#wny.ny.usa.na GEnie: ZKD
------------------------------
End of Ham-Ant Digest V94 #143
******************************