Viking VX 900 MHz LTR, User Manual

Page: 32 / 234

INSTALLATION
2-6
October 1999
Part No. 001-2009-201
2.9 REPEATER DATA BUS INSTALLATION
The repeaters are interconnected by a balanced
line High-Speed Data Bus (HSDB) consisting of a six
conductor cable. An RJ-11 to BNC Adapter Module
(see Table 1-1 and Figure 2-8) is used to connect exist-
ing (8X00) repeaters with VIKING VX repeaters and
is installed on the back of the VIKING VX cabinet
(see Figures 2-11, 2-12 and 2-13). The RJ-11 to BNC
Adapter Module is not necessary for systems that only
contain 200X repeaters of the same frequency band
(see Figure 2-10).
The total length of the HSDB cannot exceed 500
feet. Connect the cables in daisy-chain fashion to
modular connector A5 on the back of the repeater (see
Figure 2-10). A 50 ohm termination is not required
for VIKING VX repeaters, however a 50 ohm termi-
nation is required if used with existing repeaters and
the interface (see Figure 2-11).
2.9.1 MPC DATA BUS SWITCH SETTINGS
Switch settings on the MPC for the two types of
installations require S2 and S3 sections to be switched
as indicated in Figure 2-5.
Figure 2-5 MPC DATA BUS SWITCHES
1 2 3 4
1 2 3 4 5 6 7 8
S2
S3
ONLY VIKING VX REPEATERS
END TERMINATIONS
VIKING VX AND 8X00 REPEATERS
ONLY VIKING VX END REPEATERS
(CENTER REPEATERS)
ON
ON
2
1 8 7
6
5
4 3
2
1 4 3
S3 S2
ON
2 1 4 3
S3
ON
2
1 8 7 6 5
4 3
ON
2 1 8 7 6 5
4
3
ON
2 1 4 3
Figure 2-4 5-CHANNEL COMBINING SYSTEM
RECEIVER 1
RECEIVER 2
RECEIVER 3
RECEIVER 4
RECEIVER 5
RECEIVER
MULTICOUPLER
PREAMPLIFIER
FILTER
DUPLEXER
TRANSMITTER
COMBINER
TRANSMITTER 1
TRANSMITTER 2
TRANSMITTER 3
TRANSMITTER 4
TRANSMITTER 5
T/R ANTENNA
BANDPASS