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REPORT # 56050AF
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3. OCCUPIED BANDWIDTH – PER ANSI C63.4 ANNEX I.6
3.1 Test Setup and Procedure
The Test Site and EUT were set up as described in section 2.1 of this document.
The EUT is put into the operational test mode as stated in Section 1.4 and then
started. The spectrum analyzer had its self-calibration performed, and then set to
the frequency to be tested, with a bandwidth of 10kHz as per ANSI C63.4 Annex
I.6 paragraph b. The Max Peak of the Fundamental Frequency was noted, and the
points 20 dB dB below the Fundamental Max Peak, for both sides of the signal
was noted, and the frequency difference between these points was recorded as
the occupied bandwidth. See below for example.
The EUT is put into the operational test mode as stated in Section 1.4 and then
started. The spectrum analyzer had its self-calibration performed, and then set to
the frequency to be tested, with a bandwidth of 10kHz as per ANSI C63.4 Annex
I.6 paragraph b. The Max Peak of the Fundamental Frequency was noted, and the
points 20 dB dB below the Fundamental Max Peak, for both sides of the signal
was noted, and the frequency difference between these points was recorded as
the occupied bandwidth. See below for example.
Example Of Occupied Bandwidth Measurement
3.2 Occupied Bandwidth Test Data.
Frequency
(MHz)
Measured
Bandwidth
Bellow
Fundamental
Polarity
Instrument
Bandwidth
Required
Occupied
Bandwidth
Result
Comments
433.9
68.4 kHz
20dB
Vertical
10kHz
1.085 MHz
Pass
433.9
62.7 kHz
20dB
Horizontal
10kHz
1.085 MHz
Pass
Refer to section 3.3 for Test Data
20dB
Occupied
20dB Points
20dB Points
Max Peak of Fundamental
Instrumentation Bandwidth set as described in ANSI C63.4 Annex I.6
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