INTRODUCTION AND OPERATION
1-2
October 1999
Part No. 001-2009-201
rier simultaneously with voice modulation. Therefore,
no dedicated control channel is required and all chan-
nels are used for voice communications for maximum
system efficiency. Each radio is assigned a Home
Channel which sends system commands to specified
radios. There are normal words and special function
words. The special function words are used to initiate
special calls; Telephone, Unique ID, and Data by
Unique ID. The special function words are also used
for command calls: Interrogate, Kill, Reassign, Elec-
tronic Serial number Authentication, Registration, De-
Registration, etc.
Since each repeater is responsible for signaling
on its own channel, this approach lends itself well to a
distributed processing logic controlled approach
requiring only a small logic unit within each repeater.
These processors share information over a communi-
cation path. This architecture permits each repeater to
be autonomous. A failure in one repeater leaves the
remainder of the system intact and operational.
The repeaters may be connected to a larger sys-
tem. This allows the system to perform some of the
previously mentioned calls. The RNT may communi-
cate from one LTR Site to another. The system equip-
ment may be centrally located or distributed at each
Site. A Site is a set of repeaters that are intercon-
nected to pool the channels in a trunked channel
group.
1.5 ACCESSORIES
The accessories available for the Viking VX LTR
repeater are listed in Table 1-1. A brief description of
some of these accessories follows.
External Speaker- This 4 ohm speaker plugs into the
MAC card jack. The speaker provides local audio and
is adjusted by the volume control.
RJ-11 to 6-BNC Adapter- This adapter box provides
connections for the high speed data bus at the rear of
the repeater and the data bus from the logic drawers in
existing repeater systems (see Section 2.9).
19" Aluminum Shelf - Rack mounted shelf, 20"
deep, that can be used to support the batteries.
12V DC Battery - This is a sealed 12V DC lead-acid
battery intended for battery backup systems. Two bat-
teries are required per repeater. At 25
°
C, with a 100%
transmit duty cycle, the 75W repeater operates for 2
hours and the 160W repeater operates for 1 hour.
2000 Series Service Kit - This kit contains an alarm
wire harness, extender power cable, programming kit,
extender card, extender harness, and a TIC bias cable.
These items are used when tuning the repeater and
while troubleshooting.
Low Power Supply with Battery Backup - This pow-
er supply is for the 25-75W repeater and is equipped
with battery backup (see Section 2.5).
High Power Supply with Battery Backup - This
power supply is for the 75-160W repeater and is
equipped with battery backup (see Section 2.5).
Battery Backup Option - This option can only be in-
stalled by the factory. It includes the battery backup
module that resides in the power supply and the neces-
sary interconnect cabling to connect the repeater to the
batteries (see Section 2.5).
Battery Backup Cable Kit - This kit provides the ca-
bles required for connecting the terminal strip on the
power supply to the 12V DC battery (refer to installa-
tion instructions 004-2000-224).
2000 Series OCXO Drawer with 1 OCXO - The
OCXO (Oven Controlled Crystal Oscillator) drawer
produces a stable 1.25 MHz
(±
0.1 PPM) reference sig-
nal for the Receiver and Exciter synthesizers.
2000 Series OCXO Drawer with 2 OCXOs - This
OCXO drawer is the same a described above with the
exception of a backup OCXO.
1:8 Splitter Shelf - This increases the number of out-
puts from an OCXO drawer (see Figure 2.11).
Attenuator Kit - The attenuator kit is installed in the
1:8 Splitter Shelf. The attenuator is used in mixed
2009/8900 repeater systems when only one OCXO
drawer is available.
5-Channel OCXO Cable Kit - This kit includes 5-ca-
bles that connect from the OCXO drawer to the repeat-
ers in a rack (see Figure 2.11).
PC Programmer PGMR Software - 3.5" program-
ming disk used to program the repeater.Programming
Cable Kit- This kit connects the MPC and a computer
during programming and for monitoring repeater activ-
ity at the site.
Summary of Contents for VX 900 MHz LTR
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Page 40: ...INSTALLATION 2 14 October 1999 Part No 001 2009 201...
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