6802800U74-AN
Chapter 7: Radio Frequency Distribution System
Device Track ID
7.3.6.3
Tuning the MTCC in a BTS in Tetra Application Mode
The Manually Tuned Cavity Combiner (MTCC) can have 2 or 4 inputs. The TX output of each BR is
connected to an input on the MTCC. The output of the MTCC is connected to the Antenna Port of the
BTS via the TX-path of a duplex filter. A configuration file has been uploaded to the Site Controller,
defining the TX frequencies of all the BRs.
Equipment: High Power Power Meter (PM) like Stabilock 4032, which can handle up to 120W. Service
computer.
Procedure:
1 Calibrate the PM and set the frequency to the center frequency of the duplex filter. Set the PM to
display Watts.
2 Connect the PM to the TX antenna connector of the BTS.
3 Loosen the all the locking knobs of the MTCC, see the figure below (the design of the MTCC
may look slightly different), and turn the tuning knobs counter clock wise as many turns as
possible.
On the mapping list, locate the removed unit indicated as Units are not present.
Delete the old CAN Bus unit from the CAN Bus unit mapping list by entering: can
remove_mapping attc<X>.
<X> identifies the new unit name and is a digit between 0 and 2.
Step example: can remove_mapping atcc 1
Add the new CAN Bus unit to the CAN Bus unit mapping list by entering: add_mapping
attc<X><track ID>.
<track ID> is a Track ID of the new unit.
<X> identifies the new unit name and is a digit between 0 and 2.
NOTICE: The new unit Track ID is present on the replaced unit label as Track ID
mapped.
Step example: can add_mapping atcc 1 JTH0500102
View the updated mapping list by entering: can check_mapping.
On the mapping list, check that there are no units labeled as Track ID not mapped or
Units are not present.
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