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940308.txt
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1994-11-13
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Date: Wed, 14 Sep 94 04:30:22 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 #308
To: Ham-Ant
Ham-Ant Digest Wed, 14 Sep 94 Volume 94 : Issue 308
Today's Topics:
AOP-2 opinion?
Q: Gain, and beam width
Slinky antenna anyone? (2 msgs)
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: Sat, 10 Sep 1994 21:10:00 GMT
From: agate!howland.reston.ans.net!swiss.ans.net!malgudi.oar.net!infinet!n8emr!gws@ames.arpa
Subject: AOP-2 opinion?
To: ham-ant@ucsd.edu
Anyone had a chance to take a look at the cushcraft AOP-2
oscar array? I have the AOP-1 array but have it down for repairs
and figured I might as well update. From the ads I have seen it look like
a couple more elements on 2mters and a much larger antenna on 440.
comments
--
Gary W. Sanders gws@n8emr.cmhnet.org, 72277,1325
N8EMR @ N8JYV (ip addr) 44.70.0.1 [Ohio AMPR address coordinator]
HAM BBS 614-895-2553 (1200/2400/V.32/PEP) Voice: 614-895-2552 (eves/weekends)
------------------------------
Date: 13 Sep 1994 03:24:13 GMT
From: dog.ee.lbl.gov!overload.lbl.gov!agate!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!usenet.eel.ufl.edu!piaget.moe.ac.sg!raffles.technet.sg!nuscc.nus.sg!@@ihnp4.ucsd.edu
Subject: Q: Gain, and beam width
To: ham-ant@ucsd.edu
The edge of the spot beam is where the 3 dB power is. But what is the
spot beam cast on? Does it refer to a flat sheet perpendicular to the
transmission path or is it casted onto an area on a sphere radius =
transmission path?
Would appreciate if someone can help me.
Chee Leong
------------------------------
Date: Mon, 12 Sep 1994 17:04:24 EDT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!noc.near.net!saturn.caps.maine.edu!maine.maine.edu!jbaack31@network.ucsd.edu
Subject: Slinky antenna anyone?
To: ham-ant@ucsd.edu
Hi all, I recently saw in an old QST issue, Oct.1980, to be precise,
a ad for a slinky style antenna for 80/75, 40 and 20 meters. It used a 6 turn
balun between the lengths of slinky material. I guess to tune the antenna you
either stretched out the material or you let it compress. Has anyone ever hear
d of such a thing? Has anyone used it?
73's Jason N1RWY
JBAACK31@Maine.maine.edu
"looking for new ways to get that signal out..."
------------------------------
Date: 13 Sep 1994 12:57:52 GMT
From: news.ingr.com!b17news!monty.b17b.ingr.com!gjmontll@uunet.uu.net
Subject: Slinky antenna anyone?
To: ham-ant@ucsd.edu
In article <94255.170424JBAACK31@MAINE.MAINE.EDU>, <JBAACK31@MAINE.MAINE.EDU> writes:
|> Hi all, I recently saw in an old QST issue, Oct.1980, to be precise,
|> a ad for a slinky style antenna for 80/75, 40 and 20 meters. It used a 6 turn
|> balun between the lengths of slinky material. I guess to tune the antenna you
|> either stretched out the material or you let it compress. Has anyone ever hear
|> d of such a thing? Has anyone used it?
|>
I tried one of them back in '76 when I lived on the
second floor of an apartment. It was a waste of time.
I'd have to check my old logs to see if I ever actually worked
anybody thru the slinky.
Tuning it consisted of stringing out the supporting nylon line, then streching
the slinky portion out and clipping it in place.
Then you shorted out some number of turns at each end.
(Then hope the SWR was not off-scale, and try again.)
If you've ever played with a simple slinky, you know how it can get a twist
or kink in the coils that must be backed out. Imagine the mess when you have
two slinkys, connected end to end, with the coax cable attached.
Now add the light nylon cord running through the entire contraption!
Why are you making me recall these nightmares?
73
Greg AC4WF
--
Gregory Montllor GIS Projects / Geo Systems / Solution Engineering Div
mailstop IW17B4 Intergraph Corp. Huntsville, Alabama USA 35894-0001
email: gjmontll@ingr.com phone: (205)730-7249 fax: (205) 730-1263
------------------------------
End of Ham-Ant Digest V94 #308
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