Analog to Digital Converter
This test checks if the A/D converter for measuring the final stage voltage is
accessible. A failed test indicates an issue with the I2C bus on the
microboard
,
the
pre amplifier board
, a
loose connector
between the two transceiver
halves or a defective A/D converter.
Temperature Sensor
This test checks if the temperature sensor for measuring the final stage tem
-
perature is accessible. A failed test indicates an issue with the I2C bus on the
microboard
, the
pre amplifier board
, a
loose connector
between the two
transceiver halves or a defective temperature sensor.
Digital to Analog Converter
This test checks if the D/A converter for controlling the boost converter is acces-
sible. A failed test indicates an issue with the I2C bus on the
microboard
, the
pre amplifier board
, a
loose connector
between the two transceiver halves
or a defective D/A converter.
Rx Current
This test checks if the overall current draw while in receive mode (idle) is below
1A. This test can fail if too many accessories (Dual Antenna Switch Unit, ATU,
linear amplifier etc) are connected to the SDR or if the accessories are faulty.
Disconnect all accessories and rerun the tests. If the test is failed again, there is
an issue with the
pre amplifier board
.
Tx Current
This test checks if the overall current draw while in transmit mode (BIAS current
added) is between 1A and 4A. A failed test indicates the same issues as with
the “Rx Current” test. Additionally, there may be an issue with the final stage
on the
pre amplifier board
.
Final Voltage
This test checks if the voltage of the final stage is between 28V and 32V. A failed
test indicates a defective
pre amplifier board
(port expander fails to config
-
ure the pre amplifier board, the D/A converter fails to set voltage, the boost
converter fails or the A/D converter fails to read the voltage).
212
BARRETT PRC-4090 TACTICAL HF SDR TRANSCEIVER - APPENDICES
Содержание 4090 HF SDR
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