• 2.5mm TRR jack cable or adapter from 3.5 mm TRR cable
• USB cable to power the system
• MAX3232 chip

• GPS module Beitian BN-220

• Heat Shrink

• Strip board
• Header pins
• MAX3232 chip
• Dupont connectors
• Heat shrink
• USB cable or some other way to power the system
• RS232 to UBS adapter

• u-blox u-center v22.02 - download link
• Yaesu FTM-300 external GPS connector pinout

Pictures of the development board used to setup GPS module

1. Install U-Center for Windows (sorry Linux and Mac fans, but there is a work around…)
2. Open U-Center
3. Connect the GPS module via USB and use Device Manager to identify the COM port
4. Set the COM port in u-center as per device manager and click connect
5. 
6. Wait for GPS to lock on (you will see a position appear in u-center)
7. 
8. Open the View menu and select Configuration View
9. 
10. Select GNSS in the left hand pane and ensure only GPS, SBAS and QZSS are enabled. Ensure Galileo and GLONASS are DISABLED.
11. 

Yaesu FTM-300 requires higher logic levels than BN-220 can provide. MAX3232 is used to translate lower TTL logic levels to higher RS232 logic levels - Quick tutorial here. GPS module will require to be set to GPS constellation only in u-center. Radio needs to be set to external GPS device. Transmit from the radio Data Tx to GPS receive Data Rx does not need to be connected. Baud rate is set to 9600.