Philippine Amateur Radio Association Inc. (PARA / DX1PAR)
Philippine Amateur Radio Association Inc. (PARA / DX1PAR)
I’ve recently finished building a satellite traker based on SATNOGS satellite tracker.
The automated tracker uses an Arduino to control a pair of stepper motors that move two cross-yagi antennas (VHF and UHF). The Arduino receives satellite’s azimuth and elevation info using the tracking software Gpredict. Hamlib is then used to establish a link between the computer and Arduino through USB connection via EasyComm III protocol.
The tracker was built with parts taken from a drill such as gears and bearings, along with a pair of worm drive from a photocopying machine. The total costs of the project is less than 100 USD, antennas included. The tracker uses two A4988 stepper motor driver, and two geared stepper motors. A weatherproof metal ammo box is used as a case, and rubber seals (particularly in the azimuth and elevation shafts) prevent water from entering.
Initial tests showed good tracking accuracy, allowing reliable full-duplex communications with any passing amateur radio or weather satellite.
By:
Night Sky in Focus
Astronomy and Amateur Radio
© Anthony Urbano (Manila, Philippines
http://www.nightskyinfocus.com