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1.1.3 PWR LED
LED Flash Cadence
5 flashes, pause
4 flashes, pause
3 flashes, pause
2 flashes, pause
1 flash, pause
LED ON continuously
Table 1: Interpretations of LED flash cadence
Indication
Flashing, 5 per second
Flashing, 4 per second
Flashing, 2 per second
Flashing, 1 per second
Continuous
Table 2: Interpretations of LED flash speed, for ear ly models
1.1.3
POWER LED
The Power LED shows that the dc supply is connected to the receiver.
1.1.4
TX LED
The TX LED illuminates when the transmitter is keyed. It will not illuminate (and an
ALARM cadence will be shown) if the synthesizer becomes unlocked, or the output
amplifier supply is interrupted by the microprocessor.
1.1.5
ALARM LED
The Alarm LED can indicate several fault conditions if they are detected by the self test
program.
The alarm indicator shows the highest priority fault present. Transmitters
using software issue 5 and higher use the cadence of the LED flash sequence to indicate
the alarm condition. Refer to table 1. Transmitters using software issue 4 and lower
use the LED flash rate to indicate the alarm condition. Refer to table 2.
1.1.6 ALC LED
The ALC LED indicates that the transmitter output power is being controlled by an
external amplifier through the external ALC input.
Page 6
Fault Condition
Synthesizer unlocked
Tuning voltage out of range
Low forward power
High reverse (reflected) power
Low dc supply voltage
Transmitter timed out
Fault Condition
Synthesizer unlocked
Tuning voltage outside correct range
Low forward power
High reverse power
dc supply voltage low or high
1 OPERATING INSTRUCTIONS
RF Technology T220
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