Re: [amsat-bb] New Antenna

[Jim Wright <wa4ivm@xxxxxxxxx>]

Bob,
In the May, 1992, issue of 73 Amateur Radio Today, there is an article 
similar to this LPDA.  I built one and it works as advertised on two 
meters.  I did not have means of lab checking results, but it worked 
great for fox hunting and hanging in the attic as a dual band antenna 
for my dual band HT.  I live about 17 air miles from the repeater site 
and had no problems with hitting either VHF or UHF repeater with 5 watts 
and even with 1 watt most of the time.  The pattern on UHF listening by 
ear seemed similar to the VHF pattern claimed in the article, 25 degrees 
at the half power points.

Do a GOOGLE on the author, Dave Koslow, by his call sign, N2KLK,  and 
you will get a reference in some language other than American English 
which you may be better able than I to translate.
Pictures and charts with dimentions are included in the site I found, 
just could not understand it, if I did not have the xerox copy from 73 
Mag.  in English in front of me.

I believe the antenna will cause severe desense when trying to use it 
full duplex unless an external diplexer/two radio setup is employed.  
There are many that do that working satelites handheld with two radios 
to get full duplex.

Hope this helps!

73,
Jim
AMSAT #31517

ps:  Dave is listed in QRZ.COM at the same address, Fairlawn, NJ,  as in 
1992, so he may be close enough for a phone call?

Robert Bruninga wrote:

>Fred,
>I'm curious how this antenna performs on UHF?
>All the elements appear to be about 1/4 wave on 2m
>and I dont see any taper to  shorter UHF elements?.
>
>Presumably the elements are acting as 3/4 wave
>elements on UHF, and I can understand how they
>could be resonant, but I wonder how they can
>also then have good forward gain, given that broadside
>to a 3/4 wave antenna is usually not the peak gain direction.
>
>But maybe you have come upon a working solution
>that works "outside the box" of conventional thought
>about log periodics and this could really be a neat
>approach to dual band operation.
>
>You ad mentions 9 dBi gain, but it does not specify
>separate gains for VHF and UHF which usually are
>different.  Can you clarify the two gains?
>thanks.
>
>Bob, WB4APR
>
>
>  
>
>>>>"Fred A Parker" <fparker@paulbunyan.net> 06/28/06 3:27 AM >>>
>>>>        
>>>>
>Sorry but Ebay pulled the first listing. Seems some antenna manufactures do
>not like compatition.   My intentions on this project is.   After lengthy
>discusion with Amsat oficials while working on the Eagle Modules was to try
>and help to bring new satellite users a less exspensive means to get on the FM
>Birds.   I relisted it again Per Ebay Rules.
>http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250002570306 
>Sorry again.
>
>Fred  KF0AK
>----
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