Re: [amsat-bb] "Big-Dish" project.

["Reinhard Sual" <ReinhardSual@xxxxxxxxxxxxxx>]

I am glad that you finally have started the Big-Dish project.
Hope that more-and-more station are switching to Big-dish while location
(and law) permit.
It is so wonderful to have big dish, which capable for working on Apogee in
high squint....
In my location (OI33lt), the AO-40 orbit is only slightly off on the Clarke
Belt (which is still in the reach of my Dual actuator positioner). But I
have given-up the geosat LNB/Feedhorn for AO-40, because the newer sats now
are very easy to receive with 5 feet dish (which I'm going to install in the
near future).

When I did my Big-dish project (I am using 12 feet dish with f/d approx
0.3), on July, I use Free-hand to do the drawing. It is easy to use and has
some measurement capability. And when I printed, it has the correct scaling
on my InkJet printer. Looking at your pdf, it is very nice if you also
include some measurement (instead of only scale), and if possible in both
Inch and Metric.

Hope to hear your progress on this project.

Reinhard Sual - YB0KTQ

----- Original Message -----
From: "Frederick M. Spinner" <fspinner@hotmail.com>
To: <amsat-bb@AMSAT.Org>
Sent: Tuesday, October 01, 2002 11:42 PM
Subject: [amsat-bb] "Big-Dish" project.


> I'm starting to try to get things together to put up a big-dish ala
> W0LMD-style for AO-40.  I think it'll take me months, but the things I do
> that will be useful to the AMSAT-bb community I'm going to try to share.
>
> One observation is that the "sun outage" time on the Clarke Belt is
> approaching, for the Midwest anyway and probably the rest of the US/World
> this upcoming weekend is a good time for this.  Since AO-40 follows the
> Clark Belt +/- a few degrees, this is probably a good time for everyone to
> do a site survey if a new system is planned.  For me, if I can find a
> location on my new lot that won't be shadowed during daylight hours from
> about 10/4 to 10/7 (wx permitting) the sun tracks the Clark Belt
throughout
> the day (approx, on 10/6 its within 2 degrees for example) this should
show
> that I have found a good spot (+/-) for AO-40 reception.
>
> A good prediction tool (aimed at TVRO geostationary satellite use, but
still
> really cool nonetheless) is at
> http://perso.numericable.fr/~gjullien/satellite.htm
> this should help you to visualize what I said above.
>
> The other useful piece is that I've made 1:1 templates for the W0LMD (see
> his http://www.ultimatecharger.com/dish.html then "dish feeds"
> page) circular 2.4 GHz feed.  I'm intending on doing the same for the 1269
> circular/dual band feed.  The format is in .PDF, and seems to print 1:1 on
> everything I've tried printing it on, but please double check the "ruler"
on
> the top of the link for scale accuracy.
>
> The page:  http://www.fredspinner.com/W0FMS/NewPatch
>
> Fred W0FMS
>
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