Dittel FSG 2T PS, Operator'S Manual

Page: 35 / 57

FSG 2T PS
Portable VHF/AM Airband Transceiver
May 2010 DITTEL – D10077
35
4.14 Battery Operating Times
The following duty cycle of Transmit (TX), Receive (RX) and Standby
(STBY) results in available operating time (hours). Both the worst and
the most favorable operation conditions are considered, e.g.
maximum receiver volume combined with maximum speaker load.
Higher current consumption will degrade the nominally available
battery capability, as well as lower temperatures. The following tables
show significant time differences depending on current consumption
due to different duty cycles and temperatures.
Condition: only headset operated
Max. current drain
.05A 1.35A .26A .05A 1.35A .26A .05A 1.35A .26A .05A
Sealed lead-acid battery
12 Volts 7.2 Ah
STBY,
w/out RX
5%
TX
5%
RX
90%
STBY
10%
TX
20%
RX
70%
STBY
20%
TX
40%
RX
40%
STBY
Temperature -20°C/-4°F 76 hrs 30 hrs 16 hrs 9 hrs
Temperature +20°C/+68°F 131 hrs 52 hrs 29 hrs 16 hrs
Temperature +50°C/+122°F 139 hrs 55 hrs 30 hrs 16 hrs
Condition: maximum RX audio volume (Loudspeaker
Max. current drain
.05A 1.35A .8A .05A 1.35A .8A .05A 1.35A .8A .05A
Sealed lead-acid battery
12 Volts 7.2 Ah
STBY,
w/out RX
5%
TX
5%
RX
90%
STBY
10%
TX
20%
RX
70%
STBY
20%
TX
40%
RX
40%
STBY
Temperature -20°C/-4°F 76 hrs 25 hrs 11 hrs 6 hrs
Temperature +20°C/+68°F 131 hrs 44 hrs 20 hrs 10.5 hrs
Temperature +50°C/+122°F 139 hrs 46 hrs 21 hrs 11 hrs
4.15 Emergency Operation
Without degradation the
FSG 2T
can be operated on a dc source
between 11 Vdc and nearly 9 Volts. This however will NOT reduce
the TX output level, RX sensitivity, and audio output power, due to
internal supply regulation. Below 11 Volts the dc indicator flashes
continuously as a low supply warning.
Since the current drawn from battery will increase with lowered Dc
supply voltage, the automatic shut-down will speed-up.
If the supply voltage drops below 9 Vdc the
FSG 2T
switches OFF
itself. This automatic feature avoids battery damage due to deep
discharging, even if the radio is left switched ON for months! This is
true for all types of 12 Vdc batteries.
If the battery recovers and voltage exceeds approximately 10.5 Vdc,
the radio returns to operation with the last used setting.