Viking VX 900 MHz LTR, User Manual

Page: 103 / 234

CIRCUIT DESCRIPTION
6-43
October 1999
Part No. 001-2009-201
Pin 28 A D LEVEL
This is the Audio/Data Level output.
Pin 29 TX MOD
The output of this pin is produced by audio and
data inputs to the Repeater to produce the signals on
this pin. This signal goes through the RFIB and then
to the Exciter.
Pin 30 UNUSED
Pin 31 RX VOICE
This is receive audio output connected to the
backplane.
Pin 32 TX VOICE
This is transmit audio input connected to the
repeat gate.
6.12.13 J100 A D LEVEL TEST POINT
This test point located on the front card edge is
used during alignment to monitor audio and data.
6.12.14 J101 SPEAKER/MICROPHONE
This jack is used in conjunction with J102 when a
combination speaker/microphone is used during setup
and testing of the repeater.
6.12.15 J102 LOCAL MICROPHONE
This jack is used for a microphone to key the
Exciter and inject transmit audio.
6.12.16 J103 GROUND
This jack provides a ground connection for the
MAC when monitoring the test points.
6.12.17 J104 EXTERNAL SPEAKER
J104 provides an external speaker connection at
the repeater site for monitoring.
6.12.18 J105 WATCH DOG
J105 enables or disables the watchdog timer for
reset. Normal operating mode is P105 jumpering
J105, pins 2/3. This jumper should not be moved or
removed.
6.12.19 J106 TX DATA PATH
Jumpers P106 and P107 connect J106, pins 1-2
and 3-4 for external options that require the Tx Data
signal. Normal operation connects J106, pins 2-3 and
4-5.
6.13 INTERFACE ALARM CARD
This card stores the information required to oper-
ate the alarms designated in the programming of the
repeater. Data is received on the address bus from the
MPC for the; operation to perform, the processor and
external memory, open and close relays on the outputs,
and receive alarm indications on the inputs. This
information is either routed to external devices or
alarm outputs can be wired to alarm inputs (see Figure
4-10).
The Interface Alarm Card (IAC) contains 4-input
contacts and 4-output contacts. The 4- inputs can be
disabled, energized or de-energized. The 4-output
relays are dry contacts that have a 2A rating and can
be either normally open or normally closed.
The electromechanical relay outputs are com-
prised of eight SPDT (normally open) relays. The
relays are all open at power-on. Data to the relay is
latched by a write to the base address.
The IAC activates relays when alarm trigger
events occur. The IAC monitors for alarm activity in
the system and can set the various output relays as
defined by the user during programming. When an
external alarm is set it can be monitored from a remote
location. Refer to Section 4.3.3 for alarm program-
ming.
6.13.1 RELAY OUTPUTS
The alarm relay outputs are provided via a termi-
nal block on the back of the repeater (see Figures 6-16
and 6-17). The alarm outputs are on the terminal block
at the rear of the repeater.