COMPONENT MAINTENANCE MANUAL
1152682
Page 106
Oct 27/06
© Honeywell International Inc. Do not copy without express permission of Honeywell.
23-24-02
(2)
121.5/243.0 MHz Carrier Frequency, Test # 2
(a)
Equipment Required
1
HP 8590 spectrum analyzer (or equivalent)
2
30 dBm attenuator
(b)
Test Procedure
1
Connect the transmitter unit to the spectrum analyzer using a co-axial cable
(preferably low-loss) of known db loss and place the 30 dBm attenuator in
between so that the power rating of the spectrum analyzer is not exceeded,
resulting in damage to the equipment.
2
Set the spectrum analyzer as follows:
•
Center Frequency: 121.5 MHz
•
Span: 100 kHz
•
Resolution Bandwidth: 1 kHz
•
Video Bandwidth: 1 kHz
•
Max Hold A: On
•
Reference Level: 10 dBm
3
Activate the transmitter unit by moving the switch on the transmitter unit from
the OFF position to the TX position.
4
Capture the 121.5 MHz signal on the analyzer and use the PEAK SEARCH to
locate the carrier. Record the frequency value indicated by the analyzer as the
121.5 MHz carrier frequency, which shall be 121.500 MHz ±6 kHz.
5
Repeat this procedure for the 243 MHz signal changing only the Center
Frequency setting on the spectrum analyzer to 243 MHz. All other settings
remain the same. Record the value for the 243 MHz carrier frequency, which
shall be 243.000 MHz ±12 kHz.
6
Place the switch on the transmitter unit back to the OFF position.
(3)
Audio Modulation Test, Test # 3
(a)
Equipment Required:
1
HP 8590 spectrum analyzer (or equivalent)
2
30 dBm attenuator
(b)
Test Procedure:
1
Activate the transmitter unit by moving the switch on the transmitter unit from
the OFF position to the TX position.