System telemetry module STM is a device for sending of telemetry data, a beacon text message, and position reports, when attached to an UHF transmitter. The error controlling transmission is accomplished at user selectable time intervals. It is capable of sending these messages via digipeater with as many as four hops.

The unit accepts Global Positioning System (GPS) data in NMEA 0183 and TAIP formats for position reporting and can telemeter eight A/D inputs (8 bits resolution) as well as sixteen bits of digital input.

Through the use of configuration software "STMС.EXE" the user is able to customize call signs and other parameters. An on-board EEPROM stores configuration information indefinitely (for 200 years) and "STMС.EXE" can be run as often as needed (up to 10M times) to change settings. 

An on-board voltage regulator accepts power from unregulated 8 -15 VDC source or it may be run from a regulated 5 VDC source. The regulated voltage is also available for other applications, as less then 30 mA is required for the STM module in normal mode and less then 0.5 mA in sleep mode but the regulator can supply 300 mA at +5 VDC.

The STM module measures 82 x 46 mm and is fabricated on two-sided printed circuit board using surface mount technology. The microcontroller MICROCHIP PIC16C77A is in a DIP or PLCC socket for easy firmware upgrades.

 - Telemetry systems 

 - Guarding systems 

 - Vehicle monitoring 

 - Processing control 

 - Geoinformation systems 

 - 16 digital inputs 

 - 8 analog inputs 

 - 1 counter 

 - GPS protocol support (NMEA, TAIP) 

 - Serial RS-422 devices support

 - Periodic and alert messages 

 - RF 1200 bps AX.25 link

 - Career Sense / Multiple Access to RF link 

 - Power saving mode 

 - Software configuration 

 - APRS, AVL compatibility

 - Real time global monitoring over INTERNET 

 - Message acknowledgement 

 - Remote configuring of GPS receiver 

 - Remote and local control of devices 

The documentation files can be downloaded in formats: 

   Microsoft Word 97 - stm_eng.doc , 

   Adobe Acrobat Reader - stm_eng.pdf . 

  The configuration software can be get here: stmc.zip 

Information and software on the project "System Telemetry Module STM" can be found on http://ra3apw.demos.su/stm

The authors of the project: 

Karen Tadewosyan, RA3APW

Alexander Sidorin, RX3ARH.

You can get in touch with the authors by email: stm@ampr.demos.su