Description
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2.2.2
Description of the sub-assemblies
2.2.2.1
3G PA-TRX Module
The 3G PA-TRX module contains the following internal subassemblies:
• a TRX assembly that basically consists of a transmitter, two receivers and a TRX board
that processes the transmission and reception signals and manages the 3G PA-TRX
module,
• a voltage converter,
• a power amplifier.
The 3G PA-TRX module has the following items on its front panel:
• 1 “PWR” socket (item 19) for powering up the 3G PA-TRX
module
,
• 1 "SYNC" QMA connector (item 9) to connect the coaxial connecting cable with the
synchronisation board,
• 1 "RESET" push-button (item 15) for resetting the module,
• 1 set of LEDs (items 10 and 11), the meaning of which is given in Table 2.2,
• 1n ”I / O” switch (item 14) to switch the power amplifier on and off,
• 1 “CTRL” connector (item 13) connected to the SYNCHRO board,
• 1 RJ45 “TEST” connector (item 16) (reserved for the manufacturer),
• 2 RJ45 “ETH0” and "ETH1" connectors (items 18 and 17), the first to connect the
remote control and configuration PC and the second for interconnection between
IDR 3G,
• 1 extraction handle (item 12),
• 1 QN "RF" connector (item 6) for the amplified signal output to connect the coaxial
connecting cable with the cavity of the associated transmission coupler,
• 2 QMA connectors, "RX1" (item 8) and "RX2" (item 7), to connect the coaxial
connecting cables that link with teh RX outputs of the duplexers (antenna diversity
option),
• 4 fixing screws (item 5) to mount the 3G PA-TRX module in the 19" rack,
An opening on the front panel of the 3G PA-TRX module allows the air to enter for internal
cooling of the power amplifier.
The 3G PA-TRX module (see Plate 6.I, item 12) is secured to the front panel outside the
rack using 4 screws (see Figure 2.1, item 5).
