Date: Sun, 30 Jan 94 04:30:11 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 V94 #18
To: Ham-Ant


Ham-Ant Digest              Sun, 30 Jan 94       Volume 94 : Issue   18

Today's Topics:
                        8-el Quad-Yagi design
                         mininec source code
                   Need advice on FM radio antenna
                RG-58 and Discone ant. problem at VHF
                           Shorter Quagis?

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: Thu, 27 Jan 1994 09:50:58 GMT
From: sdd.hp.com!nigel.msen.com!spool.mu.edu!howland.reston.ans.net!xlink.net!rz.uni-karlsruhe.de!subnet.sub.net!rnihd.rni.sub.org!rnivh!root@network.ucsd.edu
Subject: 8-el Quad-Yagi design
To: ham-ant@ucsd.edu

sri, I couldn't send this by mail and it might be of interest for
others, too. So I post it ...

<smtp redstone-emh2.army.mil PhillipsJ@redstone-emh2.army.mil 29999>: 550 (USER) Unknown user name in "PhillipsJ@redstone-emh2.army.mil"

----------  Original Message  ----------
Subject: Re: Question about Qagi Antenna
To: PhillipsJ@redstone-emh2.army.mil (Jimmy Phillips)
Date: Mon, 10 Jan 1994 14:31:28 +0100 (MEZ)
From: Torsten Leibold <torsten@rnivh.rni.sub.org>
In-Reply-To: <9401061452.AB27282@relay1.UU.NET> from "Jimmy Phillips" at Jan 6, 94 03:52:16 pm

Hi Jimmy,

> > I've already built a 8-el Quagi for 70cm and am quite satisfied with
> > it. I took the information from the "Rothammel" antenna design book,
> > which is very famous in Germany. This information has been taken from
> > the following source:
> > 
> > Overbeck, W.: The VHF Quagi, QST, Newington, Conn., 1977, April, p. 11-14
> > 
> > The inventor of this design seems to be K6YNB, don't know his name.
> > I could send you the measures for a 8-el Quagi either for 2m or 70cm,
> > if you're interested in it ...
> 
> 
> Torsten,
> 
> Thank you for replying and I would be very interested in those
> measurements.

Alright, here you are:

  |      |      |      |      |      |   Q     Q
  |      |      |      |      |      |   Q     Q
  |      |      |      |      |      |   Q     Q
  ++++++++++++++++++++++++++++++++++++++++++++++
  |      |      |      |      |      |   Q     Q
  |      |      |      |      |      |   Q     Q
  |      |      |      |      |      |   Q     Q
     A6     A5     A4     A3     A2   A1    AR
  D6     D5     D4     D3     D2     D1  SQ    RQ

A? is the distance between the two adjacent directors.
D? is the director itself, meaning its length
SQ is the emitting element, its length is meant as the total circumference
RQ is the reflector, length is measured like SQ

measurements are in millimeters (mm):

resonance freq. 144.5 MHz 432 MHz
overall length  4205  1405
RQ  2200  711
SQ  2083  676
D1  913  299
D2  908  297
D3  903  295
D4  899  293
D5  894  292
D6  889  291
AR  533  178
A1  400  133
A2  838  279
A3  445  149
A4  663  222
A5  663  222
A6  663  222

1" = 2.54 cm = 254 mm

I hope that helps ...

Bye,
  Torsten.

-- 
 O  /         ____       _   Torsten Leibold (DG4FEX)
-+-=       | __\_\_o____/_|   Konrad-Adenauer-Allee 105
/ \        <[___\_\_-----<   68519 Viernheim, Germany
           |  o'        ...!subnet.sub.net!rnihd!rnivh!torsten
----------------------------------------------------------------------------

------------------------------

Date: Thu, 27 Jan 1994 18:20:26 GMT
From: ucsnews!sol.ctr.columbia.edu!howland.reston.ans.net!paladin.american.edu!darwin.sura.net!fconvx.ncifcrf.gov!mack@network.ucsd.edu
Subject: mininec source code
To: ham-ant@ucsd.edu

In article <steve-260194134849@brainiac.hi.com> steve@hi.com (Steve Byan) writes:
>Is anyone aware of an ftp site that has the source for mininec?
>
Dear Steve,
 I think (only think remember ) that mininec was written by a guy
with the second name of Beazley , who advertises in QST, under the name
of his software company and I doubt if the source code is avaiable. 
 Mininec is a little antiquated now. I like yagiopt (by the same guy)
for yagis, for other antennas I don't know what's the best.

 73 Joe Mack NA3T
 mack@ncifcrf.gov

------------------------------

Date: 23 Jan 94 16:45:44 GMT
From: digex.net!access!ewok@uunet.uu.net
Subject: Need advice on FM radio antenna
To: ham-ant@ucsd.edu

I'd like to improve my reception of an FM radio station (90.5 MHz) on my
home consumer-level receiver.  I'd like to do this at minimal expense.
I've been told that I can tap my rooftop UHF/VHF television antenna, that
FM radio is in a band between television channels 6 and 7.

Is this correct and is using the TV antenna a good way for me to go?
What about impedance matching - does a typical TV antenna require 75,
300, or some other impedance cable?

And if this is not a sensible way to go, what cheap alternatives exist?
References to books or articles that I might find at the public library
would be helpful as well.

Thanks...

Bill O'Reitz

------------------------------

Date: Fri, 28 Jan 1994 00:08:39 GMT
From: envoy.wl.com!caen!usenet.cis.ufl.edu!eng.ufl.edu!saimiri.primate.wisc.edu!sdd.hp.com!vixen.cso.uiuc.edu!howland.reston.ans.net!agate!netsys!direct!news.direct.net!kg7bk@decwrl.dec.com
Subject: RG-58 and Discone ant. problem at VHF
To: ham-ant@ucsd.edu

Chester Howes (chowes@nyx10.cs.du.edu) wrote:
: A guy I know recently installed a Discone Antenna (R-S brand) and 50 ft of 
: RG 58 for his scanner. Chester F. Howes, N8GHF, <chowes@nyx.cs.du.edu>

Hi Chester, don't know much about discones but you will lose at least
half your signal in 50 ft of RG-58 on 2m. RG-58 is not good for vhf/uhf.

73, Cecil, kg7bk@indirect.com

------------------------------

Date: Sat, 29 Jan 94 03:07:29 -0500
From: library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!noc.near.net!news.delphi.com!usenet@network.ucsd.edu
Subject: Shorter Quagis?
To: ham-ant@ucsd.edu

   I think, (no expert) that on 2 meters u only need about 10 inches
   between elements which would give you 12 elements on ur 10 ft boom.
   That should be plenty for almost anything (maybe except moonbounce)
   you would have to go to about 24 elements to get three dB more than
the 12 element.Be glad u can put up 12 elements.

------------------------------

End of Ham-Ant Digest V94 #18
******************************
******************************