448 | Aprisa SR+ User Manual
Aprisa SR+ User Manual 1.11.1
Routine Maintenance
Power Supply Check
Check that power supply is within limits;
13.8 VDC Nominal
48 VDC Nominal
+10 to +30 VDC
18 to 60 VDC
Temperature Test
Check the transmitter temperature (see Monitoring > Radio
‘Transmitter
Current Temperature
’
on
page 318). The normal operating range is 0 to 70 °C.
Connections
Check that all connections including earthing, interfaces and RF connectors are secure.
Antenna and Feeder System
Check the VSWR and compare the measurement to the commissioning values (see Monitoring > Radio
‘Transmitter Last TX Packet VSWR’ on page
318). This value will be dependent on the feeder and antenna
performance, a value of <1.5:1 shows acceptable performance.
Check the reverse power and compare the measurement to the commissioning values (see Monitoring >
Radio
‘Transmitter Last TX Packet Reverse Power’ on page
318). The value will be dependent on the
impedance presented to that antenna port of the radio by the feeder and antenna system. A reflected power
of 15 dB below the transmit power shows an acceptable performance.
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