Technical data
VHF/AM RADIO FSG 2T
6 Operation
June 2014 FAV_D10048 67
6.12 Operating times of FSG 2T supplied from a 12 V battery only
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 during Receive, and at temperatures.
Condition: only headset operated
Max. current drain .05A 1.35A .26A .05A 1.35A .26A .05A 1.35A .26A .05A
Lead Accumulator
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
Lead Accumulator
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
6.13 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.