QRZ! Ham Radio 4/QRZ Ham Radio Callsign Database - Volume 4.iso/digests/antenna/940112.txt

Internet Message Format | 1994-11-13 | 10KB

Date: Tue, 19 Apr 94 12:45:33 PDT
From: Ham-Ant Mailing List and Newsgroup <[e-mail]>
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Reply-To: [e-mail]
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Subject: Ham-Ant Digest V94 #112
To: Ham-Ant


Ham-Ant Digest              Tue, 19 Apr 94       Volume 94 : Issue  112

Today's Topics:
                   ? About 5/8ths antenna at 900Mhz
                      About Lightning Bolt Quad
                         Antenna Info needed
   Formula for determining optimum distance between elements in a Y
             GAP verses Butternut Comparison Questions..
                 Getting ladder line out of the shack
                 groundplane antenna for 157.32125mhz
                       HF mobile and the HS-100
                    Through-the-window on a Saturn
                    Where to get KCTracker/Tuner ?

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Archives of past issues of the Ham-Ant Digest are available
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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.
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Date: Tue, 19 Apr 1994 10:14:34 -0400
From: ihnp4.ucsd.edu!galaxy.ucr.edu!library.ucla.edu!news.mic.ucla.edu!nntp.club.cc.cmu.edu!news.sei.cmu.edu!bb3.andrew.cmu.edu!andrew.cmu.edu![e-mail]
Subject: ? About 5/8ths antenna at 900Mhz
To: [e-mail]

Hi all!

    Ok, I looked in the arrl antenna book and the 1994 handbook, but
neither mentions the 5/8th for 900Mhz.  I can figure out the radiator
length via a formula, but what is the formula for the loading coil?

    !
    |---> radiator
    |
    {---> mysterious loading coil
    }
    |
    L--->coax 50 ohm


Thanks
N3QAT Chuck Kamas

p.s I finally HEARD and decoded packets from the shuttle!!  Oh boy!
p.p.s I guess my theroy about it all being done out of a warehouse in
Huston is disproved now. 8-<.

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Date: Tue, 19 Apr 94 02:58:31 -0500
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!darkstar.UCSC.EDU!news.hal.COM!olivea!news.bu.edu!noc.near.net!news.delphi.com![e-mail]
Subject: About Lightning Bolt Quad
To: [e-mail]

The best answer would probably be from Lightning Bolt itself, call them!

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Date: 19 Apr 94 18:16:13 GMT
From: [e-mail]
Subject: Antenna Info needed
To: [e-mail]

Hi,

I am looking for a Short Wave antenna for my Sony ICF-SW77.  I need a good
antenna to get weak signal of BBC & VOA broadcasts which are directed to Asia.
Anyone has one or knows about it, please give me suggestions and
recommendations (which kind antenna I should buy).

Thank you in advance for the information.

[e-mail]

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Date: Tue, 19 Apr 94 09:43:20 -0500
From: ihnp4.ucsd.edu!agate!cat.cis.Brown.EDU!noc.near.net!news.delphi.com![e-mail]
Subject: Formula for determining optimum distance between elements in a Y
To: [e-mail]

George Sladic <[e-mail]> writes:

>I know the driven element should be a 1/2 wavelength and the reflector 5%
>longer and the director 5% shorter in a 3 element beam.  How do I determine
>the distance between the driven element and the parasitic elements?  What
>about if the yagi has more than 3 elements, say 7?

Try to find YagiMax, it is on nic.funet.fi in pub/ham/antennas, and it
is ymax311 oir yagim311, i cant remember...

it will determine the center freq for a given deign, and optimize
it for a number of goals.  Not well documented, but it works.
I would start with one of the template files, of which there are many.

good luck,

peter
n1qdq

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Date: Tue, 19 Apr 94 03:05:41 -0500
From: news.bu.edu!noc.near.net!news.delphi.com![e-mail]
Subject: GAP verses Butternut Comparison Questions..
To: [e-mail]

<[e-mail]> writes:

>I'm always hearing talk about "longer active elements" when comparisons are
>made between the GAP and Butternut series of vertical antennas.  I would like
>to hear from users their perspectives on these antennas and how much better
>they are than a standard 1/4 wave verticle, which is what I use.  Thanks in
>advance.
>
>WL7N0 - James Wiedle

I have used both the Butternut HF2V (80 and 40m 32-foot) and the big GAP
vertical (the 160, 80, and 40-meter  45-foot tall one, I forget their name
for it).  They are both very good antennas - my experience has been very
positive on both.  My choice, hands down, is the GAP.  It's somewhat of a
pain to install (takes at least three people to do it safely) but the
results are well worth it.  The Butternut HF2V is great on 40 and decent on
80, but the GAP just blows it away.  I worked DXCC on 80 and 40 with the
GAP, running 100w or less, in a matter of a couple months of very casual
operating.  Also, I had no trouble working anything I could hear on 80 and
40.  It's so-so on 160, but I still managed to work DX with it.  If you
have the room to put it up and the people to help you put it up, go for it.

73, Mike KB3RG/CU3LF/CU0WPX

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

Date: Tue, 19 Apr 1994 11:39:34 GMT
From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!convex!seas.smu.edu!vivaldi!rsd0![e-mail]
Subject: Getting ladder line out of the shack
To: [e-mail]

In article <2oej7h$[e-mail]> [e-mail] (Larry Novak) writes:
>I use a similar technique to get my coax and ground wires out of the
>shack, but I'd hate to tell you how much plastic I cut to size and then
>shattered trying to drill/punch/cut holes in it. I finally resorted to
>melting holes thru it with my soldering iron! Does anyone have any good
>suggestions about how to stop this stuff from cracking when you're
>putting holes in it?

I had to get some new windows made for my boat. The good folks at Royal
Plastics in Dallas did it an let me watch as they cut the lexan and
drilled the holes. No cracks. So how do you do it I asked. Use DULL
drill bits says he. I've tried it an it works. Sharp bits have sharp
edges which catch the plastic and crack it.

dave

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Date: Tue, 19 Apr 1994 03:03:12 GMT
From: ihnp4.ucsd.edu!galaxy.ucr.edu!library.ucla.edu!psgrain!nntp.cs.ubc.ca!cyber2.cyberstore.ca!nwnexus!a2i![e-mail]
Subject: groundplane antenna for 157.32125mhz
To: [e-mail]

i have a scanner that i would like to build a groundplane antenna for. i
took the bottom part of the freq range     and added it to the top part of
the freq range and averaged it and came up with the above posted freq.
all i need to know is what is the formula to figure out the lengths of
the poles that point downwards and upwards?

            thanx,
            [e-mail]
--
Mike Lyon <[e-mail]>

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Date: Mon, 18 Apr 94 21:53:00 -0400
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!darwin.sura.net!hearst.acc.Virginia.EDU!pplace![e-mail]
Subject: HF mobile and the HS-100
To: [e-mail]

Do you use a HS-100 antenna?  If so on what car/truck/camper? How do you
like it?

I have one on the way and will be using it with a TS-50 in a 1990
Bronco, and a 1993 camper on a Ford E350 van chassis.

Let me know.
---
 │ SLMR 2.1a │ KC4YLX DX-CLUSTER, Troy Va  (145.09)  [e-mail]

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Date: 18 Apr 1994 22:32:47 GMT
From: ihnp4.ucsd.edu!swrinde!sgiblab!wrdis02.robins.af.mil!rcp6.elan.af.mil!ada1![e-mail]
Subject: Through-the-window on a Saturn
To: [e-mail]

I have a Larsen KG 2-70 that I want to install on my Saturn SL2.  For those
who aren't acquainted with the Saturn, the rear window has a black "dithered"
tinting on the top and side edges.  I would like to install my antenna on the
upper edge of the rear window, but the mounting instructions clearly state
that any window tinting or applications should be avoided.  I *tried* to
remove the dot-pattern tinting with a razor, but that stuff is really stuck to
the window!  A call to Saturn's customer service center revealed that the
material is supposedly impregnated into the glass (it must etch itself into
the glass).  The local sales/repair outlet has not shed any light on how to
remove the stuff.

Are there any Saturn owners out there who have addressed the problem?  If
I mount the antenna on top of the tinting, will this severely impact the
antenna performance?  What if I lower the antenna and have it span one of
the rear defroster veins?  Is there some strong solvent which will remove
the tinting?

Thanks in advance,

Ed Skochinski
KE6CSY

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

Date: 19 Apr 94 16:23:55 GMT
From: sdd.hp.com!cs.utexas.edu!geraldo.cc.utexas.edu![e-mail]
Subject: Where to get KCTracker/Tuner ?
To: [e-mail]

I need to get one of Kansas City Tracker / Tuner,
where to get and how much it cost ?

Thanks for all pointers,

Paulus N5SNN

--
Paulus Suryono Adisoemarta, N5SNN / YG1QN
[e-mail]
[e-mail]
[e-mail]

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End of Ham-Ant Digest V94 #112
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