.. .. .. .. . 15400 Calhoun Drive, Suite 400 Rockville, Maryland, 20855 (301) 294-5200 http://www.i-a-i.com Intelligent Automation Incorporated Gallium Radio User Manual v1.0 . . . . . . . . . .
Operating Manual Gallium Radio Version 1.1, September 20, 2021 1 FCC Certifications and Regulatory Information FCC Part 15 Class B Radio Frequency Interface (RFI) (FCC 15.105) This device has been tested and found to comply with the limits for Class B digital devices pursuant to Part 15 Subpart B, of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential environment.
Components Here are items that come with the radio: 1. Gallium radio board with SD card installed. 2. RP-TNC antenna. 3. Wall power adapter. 4. Micro USB connector. 5. Rotary switch with attached cable. 6. Ethernet circular connector with attached cable. Compliance with FCC rule part 15.27: The items and accessories mentioned above are included in the system to comply with the emission limits in this part.
U.FL Antenna cable Ethernet Connector Rotary Switch 4 Installation & Power up • • • • • • • Connect the USB cable to a Linux or Windows operating system. Connect U.FL cable to port RF1 on the PCB board Connect RP-TNC antenna to TNC connector on the radio lab setup. Connect Ethernet/Rortary Switch cable to port J4 on the PCB board Connect power adapter to a power outlet. Switch rotary switch from position 0 to 1. This will power up the radio.
/dev/ttyUSB0 Now, you can connect with our serial command app, minicom, to the discovered USB device (ttyUSB0). Here’s the Linux command to connect via minicom: $ sudo minicom -s You would root privilege for this command. Go to Serial port setup and make sure the device is set according to the recognized USB device (in this case ttyUSB0). The rate is 115200 Bps and NO hardware flow control. Hit Enter to save the settings and exit from the settings.
If serial port is connected correctly you will be presented with login message like below. You might need to hit more Enter to see the login: For login, enter ‘root’ as username and then password again as ‘root’ After login, we perform waveform reset twice to have radio send heart bit signal (SYNC) periodically.
6 Changing Carrier Frequency The radio configuration is set in the following file /etc/sparrow_cfg.json In order to change any configuration, we can edit this file and run re-initialize the radio. Instead of re-initialization you may opt to reboot the radio too. After the boot up, the changing configuration will take effect. Here’s an example to modify the carrier frequency: Open the configuration file with vi command. Scroll to “loFreqHz” : 915000000 And modify the LO frequency in Hz.
When radio rebooted, you should login again (login: root, password: root), and perform reset twice. 7 Transmit Enable/Disable We can set a parameter to enable and disable transmission. The radio configuration is set in the following file: /etc/sparrow_cfg.json. In order to change any configuration, we can edit this file and reboot the radio. We have to open /etc/sparrow_cfg.json file with vi command and set tx_enable parameter to 0 or 1. 1 to enable and 0 to disable radio transmission.
To edit, first hit ‘i’ and then edit with the new tx1_pa_en, and then hit ‘Esc’ and then ‘:wq” and then ‘Enter’. After the file edited you can verify it by: To see if the new configuration is set correctly. Then you need to reboot the radio by this command: When radio rebooted, you should login again (login: root, password: root), and perform reset twice. 9 Integrating Instructions Section 9.1 through 9.
9.2 Specific use conditions Gallium radio works with antenna in 900 ISM band via reverse polarity TNC mating connector. The antenna gain should be equal or less than 2.5 dBi. If Gallium radios are used in close proximity (less than 5 meter), the output power should be lowered by rotary switch as explained in section 8. 9.3 Limited module procedures This section is not applicable to Gallium radio.
9.9 Additional testing, Part 15 Subpart B disclaimer The Gallium radio module is only FCC authorized for the specific rule part 15 Unlicensed device Rule part 15.247, and that the host product manufacturer is responsible for compliance to any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. Gallium radio is Part 15 Subpart B compliant, hence the final host product still requires Part 15 Subpart B compliance testing with the Gallium radio installed.
