Belfort AWOS, Руководство по обслуживанию

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BELFORT
INSTRUMENT
Proprietary Information
31) Raise the tower. In the power enclosure, momentary turn off the AC and battery
breakers at the same time. Wait 5 seconds and then turn both breakers back on.
This resets the DCP electronics back to normal operational state.
V.
Belfort AWOS VHF Radio Accuracy Test:
1) Notify Regional OCC that the system is being taken out of service if it is a
commissioned system.
2)
Power off the VHF Unicom radio to be verified. Record the serial number of the
Unicom radio on the Commissioning / Annual Record Data Sheet.
3)
Confirm that the HP8920B has been warming up for the minimum of ½ hour
before use. Select the TX function and then AM Demodulation on the HP8920B
front panel.
4) Disconnect the antenna coax cable from the inline RF attenuator if present.
Connect the HP8920D RF input connector to the inline RF attenuator with the 50
ohm coax cable or to the radio output connector if no attenuator is present.
5) Connect a mic to the radio if one is not normally connected. Power up the
Unicom radio.
6) Press the mic talk button on the handset of the radio.
7) On the HP8920D, note the TX Frequency value and record it on the
Commissioning / Annual Record Data Sheet as the Unicom FCC Authorized
Frequency value. If the Frequency is not the authorized frequency, change the
frequency to the authorized value and make note of the change. Then contact the
facility representative and notify them of the correction made to the Unicom
authorized frequency.
8) On the HP8920D, note the TX Frequency Deviation value and record it on the
Commissioning / Annual Record Data Sheet as the Unicom Frequency Deviation
value. Frequency Deviation should be +-1 Khz. If the Frequency Deviation is out
of range, then the Unicom radio should be replaced.
9) With the mic talk button pressed, on the HP8920D note the TX RF Power value.
The Value should be 2.5 watts +- .25 w. If the measured value is within range,
record it on the Commissioning / Annual Record Data Sheet as the Unicom RF
Output Power value. If the Unicom RF power is out of range, then first verify the
25w 6db attenuator is properly installed on the Unicom radio RF output
connector. Else the radio is suspect bad and should be replaced.
10) On the FBO PC connected to the radio, initiate the 1 khz tone output on the audio
output lines as follows:
a) On PC navigate to: c:\Belfort AWOS folder;
b) Double click on: "1khz.wav";