Barrett PRC-4090 - Appendix 4 - BITE Test

It is recommended that any accessories (ATU, linear amplier, Dual Antenna
Switch Unit, secondary control head, GPS etc.), auxiliary port connections and
the antenna be disconnected from the SDS or manpack to get consistent BITE
test results. Additionally do not touch the control head and the microphone
buttons while the tests are running.
Each test is outlined below as are possible causes for a failed result. If the fault
is interfering with the everyday operation of the system, please contact your
local Barrett dealer or Support at www.barrettcommunications.com.au.
Tests
Real Time Clock
This test checks if the real time clock on the microboard responds to com-
mands. A failed test indicates an issue with the I2C bus on the microboard or
a defective real time clock.
Pre Amplier I/O
This test checks if the pre amplier board is accessible by checking if the port
expander responds to commands. A failed test indicates an issue with the I2C
bus on the microboard, the pre amplier board or a loose connector
between the two transceiver halves.
Interface I/O
This test checks if the internal interface boards are accessible. A failed test indi-
cates an issue with the I2C bus on the microboard, one of the interface
boards or a loose connector between the two boards.
Local Oscillator
This test checks if the oscillator on the microboard is accessible. A failed test
indicates an issue with the SPI bus on the microboard or a defective oscillator.
Audio Codec
This test checks if the audio codec on the microboard is accessible. A failed test
indicates an issue with the I2C bus on the microboard, a failed DSB bootup,
an ISP bus issue to the DSP or a defective audio codec.
211
BARRETT PRC-4090 TACTICAL HF SDR TRANSCEIVER -APPENDICES
Appendix 4 - BITE Test