Sea Tel 4009-9 BROADBAND-AT-SEA, Руководство по установке

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Setup – Modem Connections, Setup and Test 4009-9 Installation Manual
12-7
12.8.2. Blockage Simulation Test - SW2 Trigger State: Logic Level HIGH
1. Within the System Setup Parameters, Set System Type of the ACU to 16
(Do Not Save this Parameter
Setting)
.
2. Press the NEXT key until the Status main menu is displayed. (SEA TEL INC – Remote and
antenna software display).
3. Press the ENTER key one time to access the Tracking Control sub-menu.
4. Press the RIGHT arrow key four times to select tracking state editing mode.
5. Press the UP arrow one time to toggle current tracking state to blocked.
6. Verify “BLOCK” is now displayed as the current Tracking state.
7. Verify an Open Circuit between the SW2 and GND terminals on the interconnected TMS
Assembly.
8. Press the LEFT arrow key four times.
9. Press the UP arrow one time.
10. Press the ENTER key.
11. Verify “ON” or “OFF” is displayed as the current Tracking state.
12. Verify continuity between the SW2 and GND terminals on the interconnected TMS Assembly.
12.9. Testing the Satellite Modem Lock Input - DAC-2202
The input connections from the modem can be tested by selecting the external AGC input and monitoring the
displayed value. To test the external AGC, set the tuning frequency to 0000. Normally, AGC readings below 800
are considered a low condition and indicate modem lock and AGC readings above 800 are considered a high
condition and indicate modem unlock.
1. Verify that the satellite modem currently has RX Sync (RX Sync LED ON).
2. Turn tracking OFF so that the antenna stays pointed ON satellite.
3. Press NEXT until the Satellite menu is displayed. Press ENTER 3 times to display the Frequency entry
window. Record the frequency that the tracking receiver is currently tuned to. Press LEFT or RIGHT
arrow key to bring up the cursor under the units digit Use the UP or DOWN arrow keys to increment or
decrement the selected digit, use the LEFT arrow key and the UP or DOWN arrow keys to change the
next digit. Continue until frequency is set to 0000. Press the ENTE R key to tune the tracking receiver to
this frequency.
4. View current ON satellite LOCKED AGC value in the lower right corner of the display and measure the DC
Voltage from EXT AGC (+) terminal to the GND (-) terminal. The iDirect and Comtech modems should
have an AGC readings below 800 (LOCK = low condition) and 0 VDC across the EXT AGC and GND
terminals. The Hughes modem will have an AGC reading above 800 (LOCK = high condition) and 12VDC
across the EXT AGC and GND terminals.
5. Disconnect the RXIF input coax from the rear of the satellite modem. It should lose RX Sync (RX Sync
LED OFF).
6. View current ON satellite UN-LOCKED AGC value in the lower right corner of the display and measure
the DC Voltage from EXT AGC (+) terminal to the GND (-) terminal. The iDirect & Comtech modems
should have an AGC readings above 800 (UN-LOCKED = high condition) and about +12 VDC across the
EXT AGC and GND terminals. The Hughes modem will have an AGC reading below 800 (UN-LOCKED =
low condition) and 12VDC across the EXT AGC and GND terminals.
7. Reconnect the RXIF input coax to the rear of the satellite modem. It should regain RX Sync (RX Sync LED
ON).
8. Press LEFT or RIGHT arrow key to bring the up the cursor under the units digit Use the UP or DOWN
arrow keys to increment or decrement the selected digit, use the LEFT arrow key and the UP or DOWN
arrow keys to change the next digit. Continue until frequency value, recorded in step 3, is displayed and
press the
ENTE R key to re-tune the tracking receiver.