User's Manual

High Power Wideband Radio Head (WRH-V) Overview
044-05251 Rev B 1-5
Control Unit PCBA (CU)
Figure 1-3 shows the CU, which is the core microprocesso
r controller in the WRH-V and is connected to P2 on
the DIA. The CU contains a microprocessor, main memory, flash memory for the CU software, EEPROM
memory for parameters, memory for the event log and statistics, a REFO reference oscillator, ports for local
and remote communication, a battery powered real-time clock, and a MAC identity circuit. It supervises and
controls operational parameters such as gain control and channel handling, alarms, the event log, the
password and the logon. The CU is also a control interface for OM-Online and OMS. Software for the CU can
be downloaded from OM-Online, either locally or remotely. It is located in the lower right part of the shielded DIA
frame.
Figure 1-3 CU PCBA
Low Noise Amplifier (LNA)
LNAs are used on the uplink and are located at the top of
the cabinet and the high cover, if equipped. An
example of an LNA is illustrated in Figure 1-4. All of the coaxial connectors are SMA-type. Signals from the DPX
output are fed to the LNA input connector (IN). The OUT1 and OUT2 outputs feed the WBAs in the UL direction.
The signal level at these connectors is +20dB referenced to the antenna input. The other output, OUT LOW, is
an expansion output for an additional LNA if the WRH-V is equipped with a unit in the cover part of the chassis.
The gain to this connector is +2dB. The +7V input is used for +7V supply from the DIA PCBA and the ATT
connection is for the control signal for a controllable attenuator in the LNA.
Figure 1-4 LNA
Duplex Filter (DPX)
DPXs are located on the metal cover sheet in the upper part of the cabinet.