Base Station Repair
This two way radio base station was brought in for repair by a customer with the fault being described as ‘dead’.
It is a VHF High Band model operating in the 160 to 175 Mhz frequency band and made by Tait Electronics in New Zealand. Given its about 20 years old, the radio is in very good condition and is a testament to the build quality of these units.
A quick check with a volt meter showed no output from the power supply which should produce 13.8 volts. Checking on the transformer secondary output showed 24 volts at the bridge rectifier.
Power Supply Module Removed From Rack
A visual inspection showed no signs of component failure or evidence of overheating etc. Measuring the semiconductors showed all appeared okay so time to power up the pcb.
The regulator board was connected to a DC power supply set at 24 volts DC so measurements could be taken.
A replacement PWM chip was fitted and the board powered up again.
A final check of the transmitter and receiver on the test set to ensure all is well.
A good clean output signal with no harmonics.
I wonder if it will last another 20 years???
This article was prepared for you by Ian Corry who lives near Lancaster in the UK. He is the owner of a sound and communications company supplying public address equipment and radio communication systems to events throughout the country. He has over 30 years experience in the supply, installation and maintenance of analogue and digital radio systems.
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You may check on his previous repair article below: