I have just finished building a DIY controller as part of a home-brewed antenna rotator project. The controller allows simple clockwise and counterclockwise movement of the stepper motor using 4 buttons. The motor may be replaced with a larger one depending on the intended load. I have added an optional speaker for audible feedback.
My portable satellite radio setup won 1st place (VHF-UHF category) in this year’s go-kit (portable equipment) contest as part of the 87th anniversary of the Philippine Amateur Radio Association. It is essentially a satellite phone with collapsible antenna which allows communication with anyone, anywhere in the Philippines and neighboring countries such as Japan, Malaysia, China, Korea, Indonesia, India, Sri Lanka, Singapore, Vietnam, Hong Kong, Taiwan, and even Australia, using only a transmit power of 5W.
The go-kit was built in April 2019 to help the STAMINA4SPACE test our country’s first amateur radio satellite DIWATA2.
The Sta Rosa Council in Laguna participates in the first-ever satellite contacts between Philippine scouts as part of the 2019 Jamboree on the Air (JOTA) held on October 19, 2019 in Sta. Rosa, Laguna. Contact is achieved by beaming a radio signal on to a passing satellite and using it as a relay to reach distant stations like Malaysia and Japan. A total of 19 scouts from various schools in Laguna participated in the event.
Special thanks to the following stations who made contact with DX1DAC: DU4PGS (Catanduanes), DV2JB (Pangasinan), 9W6ZUL (Malaysia), 4G1AGI (Cabuyao, Laguna), 9M4SJQM (Malaysia), 4G1DWE (Manila), and JR6DI (Japan).
Direct Amateur Communications (DX1DAC) and AMSAT Philippines (DX1O) served as the host radio clubs for the satellite JOTA event. JOTA is the largest world-wide annual scouting event which promotes communication among scouts through the use of amateur radio equipment.
More than 50 amateur radio satellite enthusiasts attend two live satellite contact demonstration conducted by the AMSAT Philippines, Inc., Stamina4Space, and Holy Angel University, on September 28, 2019, in Angeles City, Pampanga. The live demo events were part of an amateur radio satellite seminar and antenna workshop.
The video recordings below show the two demo events featuring voice communications via AO-91 and PO-101 (DIWATA2) satellites. The official AMSAT Philippines, Inc. call sign DX1O (Delta X-ray One Oscar) was used during the event, with Anthony Urbano (DU1AU) as the operator.
Demo No. 1 Satellite: AO-91 (Fox-1B) Time: 04:09 to 04:24 UTC Elevation: 51 deg Operator: DU1AU (Angeles City)
A group of amateur radio operators from the Philippine Amateur Radio Association (PARA) worked with the engineers of STAMINA4SPACE Program (formerly named as the PHL-MicroSat Program) to test the full capabilities of DIWATA2’s Amateur Radio Unit. The task involves testing the receiving (RX) and transmitting (TX) capabilities of the satellite both for voice mode and data mode. It also includes determining the kinds of antennas, the clarity of voice communication, and how much power is actually needed to access the satellite. The testing effort lasted for two months, usually requiring operators to stay up until 1 am just to track the satellite at it passes over the Philippines, using a number of radio equipment and satellite antenna. DU1EV Eduardo Valdez, president of PARA and president of AMSAT Philippines, coordinated the frequency assignment of the satellite and its call sign DW4TA. The first successful contact made through the DIWATA2 microsatellite was on March 01, 2019, 1:27 AM, local time, between DV2JB Jharwin Barozzo (Dagupan, Pangasinan) and STAMINA4SPACE engineers 4I1DIT JP Almonte and Lorenzo Sabug operating as 4I1BBE (UP Diliman, Quezon City).
Plaques of appreciation from STAMINA4SPACE were awarded to the first 10 stations to access DIWATA 2, and certificates issued to those involved in the testing efforts. The AMSAT-PH club call sign DX1O was used as the event’s official call sign.
First 10 Stations to make a successful QSO via DIWATA2 Satellite
Leo Madrid Almazan (WA6LOS/DU3ZX, a DOST Balik-Scientist)
The awards were given on April 26, 2019, at the Electrical and Electronics Engineering Institute Bldg., University of the Philippines, Diliman, Quezon City, through AMSAT Philippines and PARA president Atty. Eduardo Victor Valdez, PHL-50 project leader Dr. Marc Caesar Talampas, and STAMINA4SPACE program leader Dr. Joel Joseph Marciano Jr.