User's Manual

20 21
Internal Module Timings
Tx delay and Rx delay timings are available for alteration
when the internal module is fi tted only. Please refer to the
programming guide and module manual for details
Power Save Mode
The modem will go into power save mode for short periods
of time to minimise power consumption when a battery
supply is being used. Parameters are programmable.
Enhanced Power Save Mode (sleep)
The modem in this mode deactivates all circuitry with
the exception of the micro controller. It is activated and
deactivated using serial commands (see Command List).
Current consumption is signifi cantly reduced to
approximately 7mA and represents an 85% saving on
normal standby consumption.
Squelch
The modem offers 2 forms of squelch, which are
programmable as RSSI level check or busy port .
RSSI level uses the RSSI level from the FM detector
chip and the point of squelch is programmable.
Noise saquelch uses the ‘on board’ circuitry to detect
noise and is manually adjusted.
Status indicators and Audible alerts
The LED indicates the current status of the radio and if
an external speaker is connected to pin 9 of the DB-15,
audible tones can be heard under certain fault conditions.
The details are shown in the table opposite.
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Status Description LED colour
Audible tone (if speaker fi tted)
Normal Power ON Green-Orange-red
Busy channel Orange Correct Call (with SAT) Green Transmit Red
Warning Busy channel lockout Green fl ashes beep tone
Time out time Green fl ashes (ptt active)
Red LED extinguishes (serieal cmd)
5 secs before TOT 1 Green fl ash beep tone
Errors EEPROM error 1 Orange fl ash
Out of lock Continuous Orange fl ashes