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2
RECEIVER INTERNAL JUMPER OPTIONS
The LED and squelch function are controlled by noise, carrier and tone squelch
circuits.
1.1.8 ALARM LED
The ALARM LED can indicate the detection of several different fault conditions by
the self test circuits. 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.
LED Flash Cadence
5 flashes, pause
4 flashes, pause
3 flashes, pause
1 flash, pause
LED ON continuously
Table 1: Interpretations of LED flash cadence
Receivers using software issue 4 and lower use the LED flash rate to indicate the
alarm condition. Refer to table 2.
Indication
Flashing, 8 per second
Flashing, 4 per second
Flashing, 2 per second
Continuous
Table 2: Interpretations of LED flash speed, for early models.
2
Receiver Internal Jumper Options
In the following subsections an asterisk (*) signifies the standard (Ex-Factory)
configuration of a jumper.
2.1
JP1: 240 Hz Notch Filter
JP1 allows the 240Hz notch filter in the normal audio path to be bypassed.
Condition
Notch Filter In
Notch Filter Out
RF Technology R220
Fault Condition
Synthesizer unlocked
Tuning voltage outside limits
Signal level below preset threshold (fixed link)
dc supply voltage low or high
External squelch is active
Fault condition
Synthesizer unlocked
Tuning voltage outside 2-7 Vdc
Signal level below preset threshold (fixed links)
dc supply voltage low or high
Position
1-2 *
2-3
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