home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
QRZ! Ham Radio 3
/
QRZ Ham Radio Callsign Database - Volume 3.iso
/
digests
/
ham_ant
/
930139.txt
< prev
next >
Wrap
Internet Message Format
|
1994-06-04
|
10KB
Date: Sat, 11 Dec 93 04:30:22 PST
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 V93 #139
To: Ham-Ant
Ham-Ant Digest Sat, 11 Dec 93 Volume 93 : Issue 139
Today's Topics:
2m car antenna?
Apartment Antenna VHF/UHF (2 msgs)
Coaxial "L" for 160 meters
deltaloop -isoloop
Loft Antenna help please
Mag North Vs True North
Suggestions for HF condo antennas?
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: 11 Dec 1993 03:57:47 GMT
From: @uunet.uu.net@network.ucsd.edu
Subject: 2m car antenna?
To: ham-ant@ucsd.edu
Regarding your request for a "no hole" mount antenna for your new
Saturn, have you seen the April 1991 issue of QST. Construction
plans are included in that issue, showing how to fabricate and
install a 2mtr glass mount antenna.
Hope you find it interesting. Mark NO8J
------------------------------
Date: 10 Dec 1993 15:28:53 -0500
From: usc!sdd.hp.com!saimiri.primate.wisc.edu!caen!not-for-mail@network.ucsd.edu
Subject: Apartment Antenna VHF/UHF
To: ham-ant@ucsd.edu
After a long hiatus from amateur radio, i am considering getting back into
it a bit, specifically in VHF/UHF area. However, I do not hve an antenna.
I live in an apartment, 3rd floor (top) with a balcony. I already asked the
office if they would object to me putting something on the balcony, and they
said no as long as the neigbors did not complain. So, I really don't have
many obstacles here... my major problem is the feed line... how do I get it
into the apartment??? I have a doorwall to the balcony and a set of windows
in each of two bedrooms. The apartment is setup long ways, kinda like a
rectangle. There is an attic/crawl space access in my bedroom closet, but I
have not ventured up there yet.
Can anyone give me some tips/ideas for this setup?? I really don't want to
do anything too involved as I seem to move around a lot and don't know how
long I will be here... Thanks!!!
--
* Matt Weisberg, CNE MILLIWAYS - Computer and Network Consulting *
* PP-ASEL 21650 West Eleven Mile Road #202 *
* Amateur Radio: KF8OH Southfield, MI 48076 *
* Internet: moodyblu@ais.org (810)350-0503 Fax:(810)350-0504 *
------------------------------
Date: 10 Dec 93 22:00:51 GMT
From: ogicse!emory!darwin.sura.net!fconvx.ncifcrf.gov!fcs260c!mack@network.ucsd.edu
Subject: Apartment Antenna VHF/UHF
To: ham-ant@ucsd.edu
How about a glass mount half wave vertical on the outside of the window and
feed onto the inside of the window (can't have double thickness window though).
Joe NA3T
mack@ncifcrf.gov
>
>* Matt Weisberg, CNE MILLIWAYS - Computer and Network Consulting *
>* PP-ASEL 21650 West Eleven Mile Road #202 *
>* Amateur Radio: KF8OH Southfield, MI 48076 *
>* Internet: moodyblu@ais.org (810)350-0503 Fax:(810)350-0504 *
------------------------------
Date: Thu, 9 Dec 1993 02:17:04 GMT
From: netcomsv!netcom.com!fmitch@decwrl.dec.com
Subject: Coaxial "L" for 160 meters
To: ham-ant@ucsd.edu
hi... mitch, wa4osr here in mobile, alabama...
i am looking to put up an antenna for 160 meters... a friend has
recommended the W4TWW coaxial inverted "L" ... apparently this
antenna was in the arrl antenna handbook at one time... the
antenna is constructed of 88 feet of coax (vel. factor .66)
and 36 feet of wire... i don't think i can describe verbally
(easliy) how the antenna is constructed... ANYWAY, can anyone
give me any information on this antenna and tell me if it will
be any better than a plain inverted L like is in the current
arrl handbook???
thanks,
mitch, wa4osr
--
-------------------------------------------------------------------------------
fmitch@netcom.com
Felton "Mitch" Mitchell, WA4OSR in Mobile, Alabama USA
205-342-7259 home, 205-476-4100 work, 205-476-0465 FAX
co-sysop for W4IAX bbs running fbb ... sysop for WA4OSR DXCluster in Mobile..
------------------------------------------------------------------------------
------------------------------
Date: Tue, 7 Dec 1993 10:31:44 GMT
From: nntp.ucsb.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!pipex!zaphod.crihan.fr!univ-lyon1.fr!stdin.gatelink.fr.net!lvds@network.ucsd.edu
Subject: deltaloop -isoloop
To: ham-ant@ucsd.edu
Hi,
Please, could someone explain the differences between deltaloops and
isoloops and the way to made one by myself ? What are specificities
of such kind antenna ?
Cheers, Laurent.
------------------------------
Date: 6 Dec 1993 21:55:47 GMT
From: mvb.saic.com!unogate!news.service.uci.edu!usc!venice!wp-sp.nba.trw.com!newswire.etdesg.trw.com!wayne@network.ucsd.edu
Subject: Loft Antenna help please
To: ham-ant@ucsd.edu
Re: 2 mtr indoor antenna
I have had reasonably good luck with a single quad loop. Construct
the loop per typical dimensions (about 18 in/side). Use corner
feed from a side corner for vertical polarization (quad diagonal
oriented vertically). This loop can be suspended from the middle
of the room and rotated. With this construction, the antenna consists
of wire, and a single horizontal spreader. A fiberglass "arrow"
blank is a good material. (or buy a fiberglass arrow, and cut off
the stuff from both ends)
A cubical quad is also effective indoors. Build the antenna from
fiberglass arrows, and a square wooden boom (1/2 in square is fine)
Drill holes in the boom to push the arrow shafts through.
--wayne W5GIE
------------------------------
Date: Thu, 9 Dec 1993 17:21:47 GMT
From: pravda.sdsc.edu!usc!howland.reston.ans.net!europa.eng.gtefsd.com!emory!rsiatl!ke4zv!gary@network.ucsd.edu
Subject: Mag North Vs True North
To: ham-ant@ucsd.edu
In article <171480001@hpcuhe.cup.hp.com> donh@hpcuhe.cup.hp.com (Don Hay) writes:
>While checking a beam heading the other night, the following question
>came to mind. In San Jose, where I live, Magnetic North is 16 degrees
>east of true north. If my beam heading is 'true north', will the RF
>be squed by the fact that magnetic north is to the east? In other words,
>does the magnetic properties of the earth cause signal squing problems?
>Don't think this is really a problem as the beam pattern is quite spread
>at a distance anyway. I just found this to be an interesting thought!
The Earth's geomagnetic field does affect propagation, especially on
transpolar paths, but it won't skew your pattern because of simple
declination. Read up on a mode called FAI.
>Keep CW alive and well!
If you must.
Gary
--
Gary Coffman KE4ZV | I kill you, | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems | You kill me, | uunet!rsiatl!ke4zv!gary
534 Shannon Way | We're the Manson Family | emory!kd4nc!ke4zv!gary
Lawrenceville, GA 30244 | -sorry Barney |
------------------------------
Date: Wed, 8 Dec 1993 13:30:40 GMT
From: netcomsv!netcom.com!greg@decwrl.dec.com
Subject: Suggestions for HF condo antennas?
To: ham-ant@ucsd.edu
In article <2e29nd$53a@mojo.eng.umd.edu> mebly@eng.umd.edu (Mark E. Bailey) writes:
>I am helping a new ham install an HF radio setup in her condominium/townhouse.
>
>External antennas are prohibited. That leaves her attic. The attic is about
>25' by 35'. I've considered hanging a 15/10 meter dipole (or, more likely,
>inverted vee) from the peak of the roof in the attic. This would get her
>onto 10 and 15. (She's a new Tech +).
>
>I don't want to try to set up a long wire and tuner yet.
>
>I've also considered putting up a loop around the base of the attic. It
>seems that absorbtion might be a problem here.
>
>Does anyone have any comments about the loop or other suggestions?
Yes. If you want something that will work, while you experiment with
other things, try an AEA IsoLoop (I can't speak for the MFJ clone).
Mine was in the attic of my second-story condo. I suspended it from
polypropylene lines by replacing one of the case-screws with a screw-eye.
Since the coax and control lines will likely be running through the
RF, and not through the loop's node as recommended, break them up
with toroids and ferrit rods as per the ARRL Handbook.
One thing... ...the standard control box is pretty bad. They have an
automagic ($$$) one now. They didn't when I got mine, so what I used
was an MFJ SWR analyzer on a switch, which I would tune to frequency
in the receiver and then set the loop for 1:1 SWR.
Above all, this antenna works. It is also brilliant for removing all
sorts of nasty noise before it hits the receiver. It should be. It's
as narrow-band as they come.
Greg
------------------------------
End of Ham-Ant Digest V93 #139
******************************
******************************