1. CECOM LAR Tropo Operation Course
CESE
CECOM LAR Course
CONUS Branch
Fort McPherson, GA
This class will be on the CSCE or Communications Equipment Support Element.
CSCE

2. CECOM LAR Tropo Operation Course
Purpose
Provides status on shelter with 25 reporting subassemblies.
Provides a Receive Signal Level for antenna Alignment.
Recap Slide
CSCE

3. CECOM LAR Tropo Operation Course
Block Diagram
CSCE

4. CECOM LAR Tropo Operation Course
Summary Alarms
1) GO - Indicator green LED Indicates that the radio is in a go ready/functional status and no faults exist
2) FAULT-Indicator red LED Indicates a fault condition exist in the radio set
3) CONFIGURATION Indicator red LED The purpose of the Configuration Alarm is to alert the operator that the shelter is not configured for proper or normal operation.
HPA in Dummy load position
Tropo Modem in CW position
VOCU not in THRU mode
RAAM connected to the shelter
Any D/C has the Noise test switch in other than Off
On the IF test panel, any Receiver in Loop-Back
Telemetry Combiner in Loop-Back
Alarm Monitor CCA A2 S1 in ON position
However, the CCA A2 S1 requires some explanation.
When in the ON position sends a constant GO status to the ROCU and disables the audible alarm at the ROCU.
When in the OFF position allows audible alarm to function in a normal manner.
CSCE

5. CECOM LAR Tropo Operation Course
Transmitter Faults
TRANSMITTER
4) CONV 1 Indicates a fault in up-converter 1
5) SYNTH 1 Indicates a fault in the TX side of Frequency Synthesizer 1.
6) HPA 1 Indicates a fault in HPA 1.
7) CONV 2 Indicates a fault in up-converter 2 (V2 only).
8) SYNTH 2 Indicates a fault in the TX side of Frequency Synthesizer 2 (V2 only)
9) HPA 2 Indicates a fault in HPA 2 (V2 Only.
CSCE

6. CECOM LAR Tropo Operation Course
Receiver Faults
RECEIVER
10) CONV 1 Indicates a fault in Down Converter 1.
11) CONV 2 Indicates a fault in Down Converter 2 (V2 only).
12) SYNTH 1 Indicates fault in RX side of synthesizer.
13) CONV 3 Indicates a fault in Down Converter 3.
14) CONV 4 Indicates a fault in Down Converter 4 (V2 Only).
15) SYNTH 2 Indicates a fault in RX side of synthesizer 2.
CSCE

7. CECOM LAR Tropo Operation Course
Tropo Modem Faults
TROPO MODEM
16) TROPO MODEM Indicates a fault in the Transmit side (modulator) or the Receive side (demodulator) of the TROPO MODEM.
17) BER Amber LED Indicates that the BER long is between
1 x 10-2 to 1 x 10-4.
18) BER Red LED indicates that the BER long is worse than 1 x 10-2.
CSCE

8. CECOM LAR Tropo Operation Course
Miscellaneous Faults
MISCELLANEOUS
22) EQPT TEMP Indicates that the shelter temperature is approximately 135o F (Automatic shut off will occur at approximately 150o F.)
23) TED 1/2 Indicates fault in TED 1 or 2
24) DLED 1/2 Indicates fault in DLED 1 or 2
25) ECCM Not used
26) VOCU Indicates a fault in the voice order wire control unit.
27) LVPS Indicates a fault in LVPS 1 or 2
28) ANT Indicates a deviation fault in Antenna 1 or 2, from original antenna alignment.
CSCE

9. CECOM LAR Tropo Operation Course
DGM Faults
DGM
29) GM LS Indicates a loss of input on the GM
30) LSCDM LS Indicates a loss of LSCDM cable input.
31) SA Indicates a summary alarm fault in the DGM equipment
CSCE

10. CECOM LAR Tropo Operation Course
Antenna Monitor C & I
32) RSL INTEGRATION TOGGLE SWITCH Refers to receive signal level (RSL)
SHORT This position allows the monitoring of the RSL with a short time constant.
LONG Allows the monitoring of the RSL with more resolution and a longer time constant; approximately 90 seconds.
RESET Allows resetting of the long time constant circuit
33) ANTENNA toggle switch, Allows monitoring of RSL or antenna position for each antenna
34) METER SELECT SWITCH: Allows selection of meter function.
RSL 2/4 Meter indicates RSL for Receivers 2 or 4.
RSL 1/3 Meter indicates RSL for Receivers 1 or 3.
OFF This position disconnects the meter.
EL Meter indicates the elevation angle for selected antenna.
AZ Meter indicates the azimuth heading for selected antenna.
35) METER: Measures RSL and each antenna position in degrees.
36) ANTENNA 1 - synchro Used to set antenna 1 heading
37) ANTENNA 2 - synchro Used to set antenna 2 heading.
38) EL1 - variable resistor Used to set antenna 1 elevation meter reading.
39) EL2 - variable resistor Used to set antenna 2 elevation meter reading.
CSCE

11. CECOM LAR Tropo Operation Course
Alarm Monitor CCA C&I
40) CCA A2 ROCU AUDIBLE ALARM SWITCH - ON Disables the audible alarm on the ROCU and sends a constant GO status indication on the ROCU. (will not report faults to ROCU) OFF Allows the audible alarm to function in the normal manner.
41/42) CCA A4 STATION ID CODE SWITCH- 2 thumb-wheel switches used for DOW set-up
43) CCA A4 CHANNEL SELECT SWITCH-13 Position thumb-wheel switch used to select the DOW sub-channel.
44/45)CCA A6-S1, A7-S1 THROUGH DOW MODE SWITCHES. 46/47)CCA A6-S3, A7-S3 END OF LINK DOW SWITCHES.
48)CCA A12 ANTENNA SELECT SWITCH - 10 or 15.
49)CCA A13 ALARM MONITOR - METER TEST SWITCH- Spring loaded test switch, when held in the up position the meter should read center scale.
CSCE

12. CECOM LAR Tropo Operation Course
Summary
Alarm Monitor
Antenna Monitor
What is the purpose of the Alarm Monitor?
How many subassemblies are monitored?
What is the purpose of the Antenna Monitor?
CSCE