Expansion Cabinet Rfds; Figure 158: Tuning Knob And Locking Knob - Motorola MTS LiTE Installation, Configuration And Basic Service Manual

6802800U74-AN
Chapter 7: Radio Frequency Distribution System

Figure 158: Tuning Knob and Locking Knob

4 Power up the BTS and let all BRs key up. Observe that the TX LEDs of all BRs shine.
5 Connect the service computer to the service port of Base Radio 1 and log on. The service port
connector is located on the front panel of the Base Radio module. The default password is
motorola.
6 At the BR) prompt, type: dekey This command stops all RF transmission.
7 Repeat step 5 and 6 for all BRs.
8 Observe on the power meter that all BRs have dekeyed and that all TX LEDs are off.
9 Connect the service computer to the service port of Base Radio 1.
10 At the BR) prompt, type: key. After a while the TX LED of the BR will turn on and the power
meter will show the BR output power minus the loss of the MTCC and the duplex filter.
11 Slowly turn the tuning knob of the cavity to be tuned, until the power level displayed at the power
meter is at its absolute maximum.
12 Tighten the locking knob.
13 Repeat step 11 and 12 until the power level is still at its absolute maximum with the locking knob
firmly tightened.
14 Dekey the BR.
15 Repeat step 9 to 14 for all remaining BRs connected to the MTCC.
7.4

Expansion Cabinet RFDS

The Expansion Cabinet uses a high-power RFDS intended for up to four high power Base Radios in
addition to the Base Radios in the MTS 4 Prime cabinet. The RFDS in the Expansion Cabinet is made
up of the following:
• Up to three RX Splitters – a passive device functioning as an extension for the Receiver Multi
Coupler function of the Duplexer/Preselector in MTS 4 to support eight Base Radios. It is connected
to the Exp Cabinet connector on the Duplexer/Preselector present in the MTS 4 Prime Cabinet
giving the right signal level for the RX-Splitter.
• Cavity Combiners – combining of eight carriers on 1 TX antenna.
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Tuning knob
Locking knob