User's Manual

Wideband Radio Head Overview
1-6 044-05251 Rev A
WRH-V
The WRH-V is designed to provide a higher output power level and comes equipped with a
MCPA in the downlink path. The MCPA reduces the number of bands to one band per MCPA
used in the cabinet and an additional one band if a high cover is used. The MCPA is located
in the cabinet and is supplied from the existing PSU. For two bands, a high cover is used.
Chassis Design
The WRH is housed in a cast aluminium waterproof chassis, class NEMA4 / IP65 approved for
outdoor use but is also suited for indoor installations. The chassis consists of a cabinet and a
cover attached with hinges. The cabinet contains the WRH circuitry. The cover comes as either
a low or high version. The high cover can be used as an empty cover or be equipped as a part
of the WRH or an independent WRH unit. A WRH with a high cover that is equipped as two
independent units can, for example, be equipped for channel selective operation in the cabinet
and band selective operation in the cover.
Indside the WRH, a number of amplifier PCBAs are individually shielded and located under a
metal cover that can be opened outward. These PCBAs are of different types depending on the
supported system. Functionally, all WRHs are built up with a number of sub units. These are
listed and described in the following sections.
Sub Unit Overview
A number of amplifier PCBAs are individually shielded and located under a metal cover inside
the WRH. This cover can be opened outward for acess. These amplifier PCBAs are of different
types depending on the supported system. All of the WRHs are built up with a number of sub
units which are described in the following sections.
Wideband Amplifier PCBA (WBA)
WRHs can handle multiple carriers over a wide band. Each band requires one WBA for the
uplink and dowlink, and one PA for the downlink. The cabinet can be equipped with up to two
WBAs and two PAs supporting two bands. Positions 1 and 3 are assigned for a WBA.
Power Amplifier PCBA (PA)
The PA is used to amplify the output signal from the WBA in the dowlonk direction and reside
in positions 2 and 4.
Multi-Carrier Power Amplifier PCBA (MCPA)
Installed in the WRH-V only, the MCPA is used to amplify the output signal from the WBA. Each
MCPA can handle one band in the downlink direction. It requires an extra heat sink element on
the outside of the cabinet or high cover to dissipate the heat generated. The MCPA occupies
positions 3 and 4 in the cabinet and 7 and 8 in a high cover.
Booster Amplifier PCBA (BA)
A WRH can be modified with a BA on the DL path to increase the output power by 6dB
(typically) depending on system configuration. This BA can operate with a maximum of 2
channels and occupies position 3 in the cabinet and position 7 in a high cover. It also requires
an extra heat sink element on the outside of the cabinet or high cover. Some configurations use
the existing PSU while others require a second PSU.
Distribution PCBA (DIA)
The DIA is the core distribution PCBA on which all other PCBAs and units connect to in the
cabinet with the exception of the PA. A shielded metal frame on the DIA provides the mounting
location for the CU, ALI and RCIs, if used.