User's Manual

Transmit Mode – 5 watt output power
Supply Voltage Internal Regulator Current Drain
11.0 V Yes 2.2 A
12.5 V Yes 2.3 A
16.0 V Yes 2.4 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 3.9 A
12.5 V Yes 4.0 A
16.0 V Yes 4.1 A
Transmit Mode – 30 watt output power
Supply Voltage Internal Regulator Current Drain
11.0 V Yes 5.7 A
12.5 V Yes 5.9 A
16.0 V Yes 5.9 A
5.4 DUTY CYCLE/KEY-DOWN LIMITATIONS (DTX-165)
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.