BRIAN (Baofeng 888S Radio Interface to the Allstar Network) ) is a construction project that implements a Raspberry Pi hosted Allstar node using the circuit board and other parts from a Baofeng BF-888S as the node radio.
BRIAN is powered by a 120 VAC to 5 VDC power adapter. The power adapter plugs into a standard DC jack on the rear of BRIAN. Two cables coming from BRIAN plug into the Raspberry Pi microUSB (5VDC) and USB jacks. Front panel LEDs indicate the status of BRIAN power (blue), radio power (blue), COS (yellow), PTT (red) and connection status (blinking green). The 888S circuit board is modified to reduce the output power to 20 – 50 milliWatts…. perfect for a local node!
- Uses low cost, proven Sanwu CM-108 USB FOB
- Uses the circuit board from a Baofeng BF-888S UHF radio
- Small, portable with self contained radio and antenna
- Low power modification (20 to 50 mW) to the radio ensures no self generated interference
- Motherboard, daughter board design simplifies wiring
- Rugged RFI-resistant metal enclosure
- Jumpers and extra parts locations facilitate custom configurations
- Plastic end caps to ease the drilling of required holes
- Metal end caps available from enclosure manufacturer
- Optional 12 VDC operation
The BRIAN electronics is housed in an extruded aluminum enclosure measuring 4.72L x 3.07W x 1.06H inches. The Baofeng “rubber ducky” antenna is mounted to the top of the enclosure. Internally, two daughter boards – the Baofeng 888S circuit board and a Sanwu CM108A Audio FOB – are mounted to a motherboard which contains additional circuitry and jumper wire connection points to simplify wiring to the daughter boards.
BRIAN is powered by a 120 VAC to 5 VDC power adapter. The power adapter plugs into a standard DC jack on the rear of BRIAN. The PC board design contains jumpers so that an optional 12 VDC to 5 VDC inverter can be installed in the unit to permit operation from 12 VDC.
Two cables coming from BRIAN plug into the Raspberry Pi’s USB micro-B (5VDC) and USB-A jacks. Front panel LEDs on BRIAN indicate the status of the unit – BRIAN POWER (blue), RADIO POWER (blue), COS (yellow), PTT (red) and COMM STATUS (blinking green). The 888S circuit board is modified to reduce the output power to 20 – 50 milliwatts…. perfect for a local Allstar node! This modification also reduces the node current requirements to less than 450 mA.
The construction manual for BRIAN may be downloaded by clicking below:
Baofeng BF-888S Low Power Modification
The following document explains the reasons for incorporating a modification to reduce the Baofeng BF-888S power level to 20 to 50 milliwatts for BRIAN and describes how to do the modification.