User's Manual

MODEL 2130 MARKER BEACON
Rev. A April, 2005 2-5
This document contains proprietary information and such information may not be disclosed to others for any
purposes without written permission from SELEX Sistemi Integrati Inc.
The RF output of Q2 enters the gate of Q3 where it is amplified approximately 13 dB. The modulation enters from R50, L14,
L15 and L16. The gate bias voltage enters through R57. The gate voltage is set by potentiometer R56 and R58.Resistors
R50 and R51 are used to set measure the current to Q2 and Q3 in order to set the bias voltage with R54 and R56.
The output of Q3 enters the low pass filter formed by L17, C109, L19, C111, L20, C113, L21, and C114. This low pass filter
is used to reject all higher harmonics of the fundamental frequency (75 MHz).
The output of the low pass filter enters the directional coupler DC1. The forward power port is pin 3 and the reverse
power port is pin 6. The output of the directional coupler enters position 2 of TB1. TB1 and TB2 select whether the output
passes straight through to the output connector or through a 6 dB attenuator. With both TB1 and TB2 set to connect
position 1 to position 2 there is no attenuation in the output. With TB1 and TB2 set from position 2 to 3, 6 dB of
attenuation is added prior to the output connector.
Either the Standby Transmitter, Integral Monitor return, Forward Power or Reverse Power may be selected by the
microprocessor U8 to enter integrated circuit U31 where the RF signal is converted to a detected signal and then enters
analog to digital converter U32. Integrated circuit U32 is an 8 channel A/D converter that is connected to the data bus of
the microprocessor U8. The A/D converter allows for conversion of various analog inputs for integral monitor, standby
monitor, forward power, reverse power and fault isolation inputs.
2.3.1.2.3 Microprocessor Digital Section
Refer to Figure 11-12 sheet 1. Integrated circuit U8 is the Analog Devices Blackfin, BF532 microprocessor. This is a 16 bit
processor running at 400 MHz internally. This is possible by an internal phase locked loop. Integrated circuit U7 is the
voltage monitor circuit that provides a reset into U8 if the voltage becomes low. Oscillator U5 provides a precise 10 MHz
frequency source to U8 through U6D. Inverters U6B and U6F buffer the clock signal for use in the serial device (UART)
and the synthesizer.
Flash memory (U1 and U2) is provided to store program information. A non-volatile memory (U3) provides long term
storage of setup information is used along with a real-time clock crystal in conjunction with the U8 internal circuitry to
provide day/date/time information. External static random access memory (U4) is also provided for additional temporary
data storage.
The FET circuit Q1 along with L1, CR3 and C37 provides a 1.2 voltage from the 3.3 VDC source for the internal power to
the microprocessor U8.
Integrated circuit U9 is a dual universal asynchronous receiver and transmitter (UART). This integrated circuit provides
the serial communications interface to the RMS CCA and a spare serial channel. Integrated circuit U11 converts the logic
level of 3.3 VDC to RS232C levels. The U11 circuit also contains a power supply to generate +/- 8 Volts DC for the RS232
outputs. The RMS port, the spare channel and the software debug port inputs and outputs are level translated by U11.
Integrated circuit U10 provides for address decoding so that microprocessor U8 can select between the NVRAM,
UARTA and UARTB and the Analog to Digital converter channels.
2.3.2 Marker Beacon RMS Theory of Operation
The Remote Monitoring Subsystem (RMS) gathers data from various sensors and internal monitoring points within the
Marker Beacon station and controls various functions of the Marker Beacon station. In order to accomplish this, the RMS
communicates with up to two station monitors through serial interfaces. It also gathers analog and status data directly
from the various sensors.
The station status and various data is reported to the Local Status/Control Unit (LCU) and to the Remote Control and
Status Unit (RCSU) through a modem.
2.3.2.1 RMS CCA (012147) (1A4) Block Diagram Theory