Transmit Mode
– 5 watt output power
Supply Voltage
Internal Regulator
Current Drain
11.0 V
Yes
3.4 A
12.5 V
Yes
3.9 A
16.0 V
Yes
4.8 A
Warning: Although the output power can be set as low as 5 watts, and the module
is certified as low as 5 watt, operation below 5 watts output power is not
recommended. At low power levels, the output power can vary by 50% or more
with variations in ambient temperature.
Transmit Mode
– 15 watt output power
Supply Voltage
Internal Regulator
Current Drain
11.0 V
Yes
5.6 A
12.5 V
Yes
5.8 A
16.0 V
Yes
6.0 A
Transmit Mode
– 30 watt output power
Supply Voltage
Internal Regulator
Current Drain
11.0 V
Yes
8.8 A
12.5 V
Yes
8.9 A
16.0 V
Yes
9.1 A
5.4
DUTY CYCLE/KEY-DOWN LIMITATIONS (DTX-965)
The major heat generating component within the modules is the RF power amplifier which has a
maximum temperature limit that should not be exceeded. In addition, the temperature within the
module itself must be kept below the maximum temperature of the reference oscillator to ensure
that regulatory frequency stability limits are observed. As a result, depending upon the RF output
power, the supply voltage, and the ambient temperature, limits upon the average transmit duty
cycle and the maximum continuous transmitter on time exist. These limits are summarized below
for operation in still air:
Ambient Temperature (
C)
Duty Cycle (%) Key-Down Time (min)
5 watts RF output
25
100
50
50
6
15 watts RF output
25
100
50
50
6
30 watts RF output
25
75
50
25
6
Blowing air across the large finned heat sink can significantly improve the duty cycle/key-down
times.
