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Re: Mode-S Antennas



I purchased two 60-cm dishes from G3RUH several years ago (including the one
pictured).  My interpretation of his web page implies that he has more
available for sale.  Check out http://www.jrmiller.demon.co.uk/prods.html.

Kevin Smith
N3HKQ

----- Original Message -----
From: <K5OE@aol.com>
To: <n0nsv@AMSAT.Org>; <amsat-bb@AMSAT.Org>
Sent: Saturday, February 10, 2001 11:57 AM
Subject: Re: [amsat-bb] Mode-S Antennas


> Hi Mark.
> n0nsv@AMSAT.Org writes:
>
> > Well now that so many of us have our Drake 2880 downconverters and our
> >  crystals are on the way, I'm interested to know how everyone plans to
> >  get a signal to it. What is the consensus for a good 2.4ghz antenna?
> >  Helix, dish, yagi?
>
> I just put a new small dish crafted by Kevin, N3HKQ, on the Home Brew
Picture
> Album:
> http://members.aol.com/homebrewpics
>
> It is a 60 cm dish using a G3RUH helix feed and a Parabolic AB
downconverter.
>
> Anyone know where those old aluminum snow coasters are still sold?  I
built
> some MMDS downconverters in the early 80's using those, but have not seen
> them in a decade.
>
> >  Personally, I'd like to find another Conifer Dish like Myers used to
> >  sell. I had one but it got mangled due to the effects of sudden
> >  deceleration. Prices became way out-of-line (my opinion) when Andrews
> >  bought the company so I'm looking for an alternative.
>
> You are not kidding.  Those dishes have been going for around $90 on eBay
> lately.
>
> >  Homebrewing isn't
> >  an option for me, I'm all thumbs and my last project made the mangled
> >  Conifer look like a masterpiece.
>
> Pretty doesn't count for much.  Take a look at the 16-turn helix on my web
> page:
> http://members.aol.com/k5oe
>
> ...or the legendary G3RUH article:
> http://www.amsat.org/amsat/articles/g3ruh/117.html
>
> It is a mediocre antenna for receiving the AO-40 beacon in it's present
> state, but I believe (hope) it will be more than adequate when the bird is
> turned around, using the high-gain antenna, and using full power.  It
really
> is a 1 hour job to build one using only simple hand tools.  If nothing
else,
> you can build one while waiting for the crystal :-)  it will let you test
the
> Drake while you wait for a decent-priced commercial antenna.
>
> If you are interested in a Yagi (might not be a bad bet considering the
> wideband nature of the downconverters and the potential noise sources on
13
> cm), check out the DEM loop Yagi's in 3', 6', and 12' models:
> http://www.downeastmicrowave.com/Antennas.htm
>
> They also sell a small helix, for a whopping $175:
> http://www.downeastmicrowave.com/dsh23-12.htm
>
> 73,
> Jerry, K5OE
> ----
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>


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