[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

SImple TV rotator tracking of AO-40



On Sun, 22 Jun 2003, Bob Bruninga wrote about primestar (36"x26") dishes:

> Oval dishes have the potential to use only a simple $50 TV rotator for a
> fully remote controlled AO-40 one-motor Tracking system.
>
> Simply point the TV rotator's axis at the north star.  THen you don't need
> any other elevation system.  The simple TV rotator can follow AO40 horizon
> to horizon!
>
> As was pointed out in this months QST, AO-40 is always within +/- 8 degree
> of the Geostationary TV satellite ARC.   The oval shape at 2.4 GHz
> probably  has about a 20 degree vertical beamwidth  which never needs any
> vertial adjustment.  THe horizontal beamwidth is about 10 degrees.  But
> you just swing the TV rotator east to west to find the bird.
>
> This should work fine for a good low-noise system.
>
> If you need more gain, make the dish WIDER, but not taller. This way you
> still wont need  an elevation controller.  See my sketch on my AO-40 web
> page:
>
>   http://www.ew.usna.edu/~bruninga/ao40ant.html
>
> de WB4APR, Bob
>
>
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>

de WB4APR@amsat.org, Bob

PCsat WEB  page     http://www.ew.usna.edu/~bruninga/pcsat.html
ISS-APRS FAQ:       http://www.ew.usna.edu/~bruninga/iss-faq.html
CUBESAT Designs     http://www.ew.usna.edu/~bruninga/cubesat.html
APRS LIVE pages     http://www.ew.usna.edu/~bruninga/aprs.html
APRS SATELLITES     http://www.ew.usna.edu/~bruninga/astars.html
MIM/Mic-E/Mic-Lite  http://ssdl.stanford.edu/mims/

----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home