User's Manual

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RF Technology T800 Page 6
1.1.5 Alarm LED 1 OPERATING INSTRUCTIONS
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. Receivers using
software issue 5 and higher use the cadence of the LED flash sequence to indicate the alarm
condition. Refer to table 1. Receivers using software issue 4 and lower use the LED flash
rate to indicate the alarm condition. Refer to table 2.
LED Flash Cadence Fault Condition
5 flashes, pause Synthesizer unlocked
4 flashes, pause Tuning voltage out of range
3 flashes, pause Low forward power
2 flashes, pause High reverse (reflected) power
1 flash, pause Low dc supply voltage
LED ON continuously
Transmitter timed out
Table 1: Interpretations of LED flash cadence
Indication Fault Condition
Flashing, 8 per second Synthesizer unlocked
Flashing, 4 per second Tuning voltage outside correct range
Flashing, 2 per second Low forward power
Flashing, 1 per second High reverse power
Continuous dc supply voltage low or high
Table 2: Interpretations of LED flash speed, for early models
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.
1.1.7 REF LED
The REF LED indicates that the synthesizer frequency reference is locked to an external
reference.
1.1.8 TEST MIC.
The TEST MIC. DIN socket is provided for use with a standard mobile or handset 200 Ohm
dynamic microphone. The external audio inputs are disabled when the TEST MIC’S PTT is
on.