Warning: Although the output power can be set as low as 1 watt, and the module is certified as low
as 1 watt, operation below 2.5 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 – 3 watt output power
Supply Voltage
Internal Regulator
Current Drain
7.5 V
No
1.8 A
11.0 V
Yes
1.4 A
12.5 V
Yes
1.2 A
16.0 V
Yes
0.9 A
Note: The 3-watt version of the DTXM-460 operates more efficiently than the 6-watt version with power
reduced to 3 watts. Therefore, the current drain values for the 3-watt version of the DTXM-460 will be
about 80% of the values shown above.
Transmit Mode – 6 watt output power
Supply Voltage
Internal Regulator
Current Drain
7.5 V
No
2.5 A
11.0 V
Yes
2.1 A
12.5 V
Yes
2.0 A
16.0 V
Yes
1.5 A
Transmit Mode – 10 watt output power (10-watt version of DTX-460 only)
Supply Voltage
Internal Regulator
Current Drain
13.5 V
RF PA is unregulated
2.5 A
4.4
DUTY CYCLE/KEY-DOWN LIMITATIONS
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 (s)
3 watts RF output
25
30
45
50
5
10
6 watts RF output
25
20
30
50
3
5
10 watts RF output
25
20
15
50
3
5
