Mpc Data Bus Jumper Settings; Connecting Receive And Transmit Antennas; Mpc Jumpers; Antenna Connections - Viking VX 900 MHz LTR User Manual

2.9.2 MPC DATA BUS JUMPER SETTINGS

Refer to Figure 2-6 for crystal selection and
HSDB Code selections jumper placement. The
jumper on J5, pins 2-3 selects 12 MHz crystal for
LTR. The jumper on J4, pins 3-4 connects EPROM
U14, pin 27 (A14) to +5V for LTR single-ended 5V
data bus.
CRYSTAL SELECTION
J5 1
HSDB CODE SELECTION
2
J4
1
Figure 2-6 MPC JUMPERS
Jumper J4 must be placed with the following
guidelines: (see Figures 2-10 through 2-13)
J4, pins 3-4 for operation with the RJ-11 to BNC
adapter module with 200X and 8XXX mixed systems
with any version of HSDB software (see Section
4.5.5).
J4, pins 3-4 for operation with the RJ-11 to BNC
adapter module with 200X only systems with any ver-
sion of HSDB software.
J4, pins 5-6 for operation with an RJ-11 to RJ-11
cable with 200X only systems with Version 2.1d or
later HSDB software (see Section 4.5.5).
2.10 CONNECTING RECEIVE AND TRANSMIT
ANTENNAS
Receive and Transmit antenna connector loca-
tions are shown in Figure 2-7. Although each trans-
mitter and receiver could be connected to a separate
antenna, this is usually not done because of the large
number of antennas required by a multiple repeater
installation. Therefore, an antenna combining system
2 3
4 6
3 5
is usually used. An example of a combining system
for a five-channel system is shown in Figure 2-4. The
amount of power loss introduced by a combiner
depends on the type of combiner used. If it has a loss
of 3 dB, power output to the antenna is reduced by
half.
GROUND
RX
Figure 2-7 ANTENNA CONNECTIONS
BLU
YEL
BLK
ORN
GRN
RED
Figure 2-8 RJ-11 TO BNC ADAPTER
2-7
INSTALLATION
TX
PIN 5
PIN 6
HSDB- HSDB+
PIN 1
PIN 2
TLA-
TLA+
PIN 4
PIN 3
IRDB+
IRDB-
PIN 1 ORN
PIN 2 BLK
PIN 3 RED
PIN 4 GRN
PIN 5 YEL
PIN 6 BLU
PIN 7 GRY
PIN 8 BRN
October 1999
Part No. 001-2009-201