Maintenance
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CHECKING THE SYNCHRONISATION BOARD PILOT (OCXO)
PROCEDURE
• Disconnect the W2O cable from the QMA socket (LOCAL SYNC) on the front panel
(see Figure 2.3, item 11).
• Connect the power meter to the QMA socket (LOCAL SYNC) on the front panel
(see Figure 2.3, item 11).
• Connect the mains or an external DC power source and the antenna
(see Section 3.3.1.1).
• Power up the IDR IDO 3G (see Section 3.3.1.2) and wait 5 minutes.
• Check that the signal level of the pilot is + 10 dBm
+
2 dB.
• If there is a fault, change the synchronisation board (see Sheet E-3).
• Disconnect the power meter and connect the frequency meter in its place (on the QMA
socket (LOCAL SYNC) on the front panel (see Figure 2.3, item 11)).
• Check that the frequency of the pilot signal is 6.4 MHz
+
0.1 Hz.
• If the frequency is out of tolerance, adjust the frequency by turning the potentiometer
(see Figure 2.3, item 9) with a "Pading" screwdriver.
• Record the values in a table similar to Table 4.10.
• Disconnect the frequency meter.
• Reconnect the W2O cable to the QMA socket (LOCAL SYNC) on the front panel
(see Figure 2.3, item 11).
COMPLEMENTARY OPERATION(S)
• Put back the upper cover
• Test the IDR IDO 3G (see Sheet P-2).
SHEET P-3
MEASUREMENT
NOMINAL VALUE
VALUE MEASURED
level
+ 10 dBm
±
2 dB
Frequency
6.4 MHz
±
0.1 Hz
Table 4.10
LEVEL AND FREQUENCY MEASUREMENTS OF THE SYNCHRONISATION BOARD
PILOT (OCXO)
