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Re: We do not need elevation rotator fot AO-40!



Yoshi,

The inclination on AO-40 is so small that the orbit appears to be very
similar to the geostationary orbit AT HIGH satellite elevations.  If the
satellite pass is a perigee pass , then that is another story and you will
have errors in the tracking. Most of the time you will do ok with a POLAR
mount for AO-40. You need to adjust the rotor mast so that it points NORTH
an an elevation of YOUR LATITUDE. Then you adjust your antennas so that when
pointed due SOUTH they are pointing at 90-YOUR LATITUDE in elevation. This
will do the arc that you describe on your message. This works for the whole
world.

Pieter Ibelings
N4IP



----- Original Message -----
From: "Yoshihiro Imaishi" <imaishi@aa.mbn.or.jp>
To: "AMSAT-bb" <amsat-bb@AMSAT.Org>
Sent: Tuesday, June 05, 2001 4:06 AM
Subject: [amsat-bb] We do not need elevation rotator fot AO-40!


> Hello This is Yoshi.
>
>   I am using "Calsat32" - a Japanese local tracking software. This
> software has a feature to draw a Az-Ev chart of future orbits.
>   This afternoon, I tried to make a Az-Ev chart of AO-40 for 2 weeks
> from now, then I found that the AO-40 is on a "55 degrees line" at
> most of its time. Please see this image;
>
> http://www.geocities.co.jp/SiliconValley/4703/temp/ao40-weeklyorbit.gif
>
>   The current orbit is tempolary til the arcjet motor work, so I adjusted
> the element for 1) 62,000km Apogee 2) 5,000km Peregee 3) 22 hours orbit.
> Then I draw it again.
>
> http://www.geocities.co.jp/SiliconValley/4703/temp/ao40x-weeklyorbit.gif
>
>   Wao.... :-O  If I put my antenna mast as lay down at 55deg, Maybe I can
> track AO-40 at almost of the pass! I do not need any elevation direction
> systems, isn't it?
>
>   This is a good news for me to save my budget fo sat :-)
>
>   I also made a image of LEO's (UO-14, AO-27, FO-20/29, ISS and SUN) for
> each future 100 orbists.
>
> http://www.geocities.co.jp/SiliconValley/4703/temp/leo-orbit.gif
>
>   This image cleary tell me that the most of the direction is at below
> of 30deg elevation line. That is why I biult a 25deg-fixed-elevation 6ele
> YAGI for FM sat. For LEO also I do not need any elevation system Hi.
>
>
> Yoshihiro Imaishi JF6BCC/KH2GR
> GL:PM53JV, ex KC6IY(T88IY),V63BP
> mailto:jf6bcc@jarl.com or jf6bcc@jamsat.or.jp
> <http://plaza16.mbn.or.jp/~palau/> Sorry, Japanese only now.
> ----
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