Manual

USER MANUAL
3-2
21464-5
NORMARC 7050
MARKER BEACON
System Description ©1999 Navia Aviation AS
Figure 3-1 MB block diagram
3.2 Transmitters / Modulators
The NM7050 consists of two TX1373A transmitters. The main transmitter is connected to the
antenna, while the standby transmitter is connected to dummy load. A failure in the main
transmitter will cause an automatic change over to the standby transmitter.
The audio signals are generated in the LF circuitry mainly by a Field Programmable Gate
Array (FPGA). A strap field selects Inner, Middle or Outer Marker settings.
An onboard oscillator generates a 75MHz carrier wave which is amplitude modulated with the
LF
GENERATOR
RF
OSCILLATOR
POWER
AMPLIFIER
CHANGE
OVER
LOCAL
CONTROL
TX1/TX2
ON/
OFF
75 MHz
400 Hz
1.300 Hz
3.000 Hz
KEYBOARD
DISPLAY
A
D
CPU
NM7050 - MARKER BEACON
STATION
CONTROL
A
D
CPU
MONITORING
MAINTENANCE +
RMM INTERFACE
MONITOR RF
FRONTEND
MONITOR
BASEBAND+
RF LEVEL
OPTIONAL MONITOR 2
REMOTE
CONTROL
SLAVE
PANEL
LOCAL PC
REMOTE PC
RMM
POWER
SUPPLY
CONNECTION
INTERFACE
TRANSMITTER 1
TRANSMITTER 2
MONITOR RF
FRONTEND
MONITOR
AC
DC
DC
DC
LINE+
MODEM
MONITOR 1
OPTIONAL POWER
MO 1374
MO 1374
TX 1373
LC 1377
CI 1376
PS 1375
DUMMY
LOAD
MAINS BATTERY
SENSORS ETC.
BASEBAND+
RF LEVEL
MAINTENANCE +
RMM INTERFACE
MONITORING
STATION
CONTROL
SPLITTER ONLY PRESENT
IF TWO MONITORS
LF
GENERATOR
RF
OSCILLATOR
POWER
AMPLIFIER
75 MHz
400 Hz
1.300 Hz
3.000 Hz
TX 1373
ON/
OFF
MODULATION DEPTH
OUTPUT RF LEVEL
KEYING NORMAL/OFF/CONT.
STATUS
+20V
+/-15V
+5V
MONITOR 2
DATA
LINE+
MODEM
HBK782/1
RMM