Product Manual
Table Of Contents
- Abbreviations And Acronyms
- 1 Tornado System Overview
- 2 Safety Warnings
- 3 Tornado radio unit overview
- 4 Setting Up on the Bench
- 5 Configuration Control and Monitoring System (CCMS)
- 6 Changing Operating Frequency and Power Calibration
- 7 Duplexer Tuning Guide
- 8 Radio Reference Information
© MiMOMax Wireless Ltd
Tornado Product Manual
39
8.2.3 Essential Power Requirements
8.2.3.1 Voltage Range
The operating input voltage range of the power supply is 10.5 to 60 VDC. This means that the voltage must not rise above
60 VDC under idle conditions or fall below 10.5 VDC at full load.
8.2.3.2 Static Power Input
The typical power drawn when the transmitter is active is about 21W (maximum 26W). This occurs when the two transmitter
channels are operating at full power. The power drawn via the internal switching regulators is nearly independent of supply
voltage, except for some additional converter loss at the top end of the voltage range, so that the input current to the RU is
almost inversely proportional to supply voltage, e.g. approximately 2.4A at 10.5V or 0.5A at 56V This needs to be considered
when the power source is remote from the RU and cable loss is a factor.
Input Source Voltage (S)
Average Current in
Amperes = Iavg = 25/S
Circuit Breaker Current
in Amperes = Imcb =
1.5*Iavg
10.5 Volts
2.4 Amps
3.6 Amps
24 Volts
1.1 Amps
1.7 Amps
48 Volts
0.6 Amps
0.9 Amps
56 Volts
0.5 Amps
0.8 Amps
Table 1: Current draw
8.2.3.3 Starting Current
As long as the power supply can supply the static power it should be able to provide sufficient current during start-up.
8.2.3.4 Supply Polarity (Isolated Power Supply)
Both the positive and negative connections of the power supply are isolated from the case and other circuitry. The standard
DC power cable supplied with an RU is twin 1.5mm (16AWG), approximately 2m long, terminated at the RU end with a Phoenix
Contact MSTB 2,5 HC plug. This cable is wired to pins 1 (positive) and 2 of the plug, which employs screw terminal contacts.
Pin 1 – Positive (Red)
Pin 2 – Negative (Black)
Power supply connector
8.2.3.5 Grounding
The radio unit case must be grounded through an external earth strap. Generally, this is done to the local rack frame, which
in turn should be part of a well-designed station grounding system. This internal grounding is designed for EMC and transient
protection currents. The RU casting is tapped to take a M4 x 8mm screw for grounding purpose.