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General| Brand | Barrett |
|---|---|
| Model | 940 |
| Category | Transceiver |
| Language | English |
Details on equipment, transmit/receive frequency, channel capacity, and other general parameters.
Equipment, transmit/receive frequency, channel capacity, and other general parameters.
Sensitivity, selectivity, desensitisation, image rejection, spurious response ratio, and blocking characteristics.
RF output power, duty cycle, protection, sideband suppression, harmonic suppression, and carrier suppression.
Detailed explanation of the transceiver's technical aspects and internal workings.
Provides procedures for maintenance and fault finding on Barrett 900 series transceivers.
Guides for locating faulty sections using circuit diagrams and voltage points.
General troubleshooting points, including component testing and replacement strategies.
Steps to diagnose and resolve issues when the transceiver fails to power up.
Troubleshooting steps for no audio output despite normal display indications.
Checks for missing receiver audio noise, indicating potential audio path faults.
Diagnosing receive issues when noise is present but no valid signal is heard.
Troubleshooting banner display without channel information, indicating communication issue.
Diagnosing missing LCD display when internal voltages appear normal.
Troubleshooting issues related to EPROM, GAL, LEDs, and microprocessor bus activity.
Diagnosing problems with the Voltage Controlled Oscillator and Phase Locked Loop.
Steps to determine the fault module when the transceiver does not transmit.
Detailed procedure for replacing PA output and driver transistors.
Methods for realigning or rechecking adjustable components after PCB repair.
Details adjustable components on the Microprocessor PCB.
Details on adjusting components within the RF/Audio PCB.
Potentiometers for power set, bias, and driver bias adjustments on the PA PCB.
Identical to 950 with a 10-35W PA, high stability TCXO, and switch mode regulator.
Identical to 950L, featuring high stability oscillator and 500Hz filter.
