Motorola MOTOTRBO SYSTEM PLANNER Specifications download pdf (Page 85)

Power Rollback

It is important to note that when the Upgraded MTR2000 or MTR3000 is running from a DC

source, the maximum RF output power is dependent on the station power supply’s DC input

voltage. Figure 24 shows a graphical representation of what the maximum RF output power is as

a function of the DC input voltage of a UHF station and figure 25 shows the maximum RF

output power as a function of the DC input voltage of a 800/900MHz station.

From Figure 24 and 25, the following can be seen:

• The station’s max output power is equal to 0W when; 21.6VDC > DC input voltage

> 32VDC

• The station’s max output power is equal to 65W when; 30.7VDC < DC input

voltage ≤ 32VDC

• For UHF, the station’s max output power is equal to 100W when; 25.7VDC ≤ DC

input voltage ≤ 30.7VDC

• For 800/900MHZ, the station’s max output power is equal to 100W when; 24.7VDC

≤ DC input voltage ≤ 30.7VDC

• The station’s max output power is equal to (DC input voltage – 21.6) * 10 + 60;

when 21.6VDC ≤ DC input voltage < 25.7VDC

Note: 21.6VDC and 32VDC are the specified operating limits of the station. Beyond those

limits, the power supply of the station will power itself (and the Base Station/Repeater)

down for its own protection as well as the batteries.

Figure 24. UHF RF Power Out Rollback Curve

Power Out

UHF Power Rollback Profile

30.7V 32V 25.7V

DC Input

21.6V

100

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Motorola MOTOTRBO SYSTEM PLANNER Specifications Page 85