Agilent Technologies S GSM, 8922M manual Measurements

Making Measurements

Measurements

In the Agilent 8922, Output RF Spectrum measurements are made using a 3-pole synchronously tuned measurement filter. The measurement results will differ from measurements using a 5-pole filter.

The difference between measurements of the “ideal” signals using a 3-pole filter and a 5-pole filter are shown in Table 1 and Table 2. These values are added to the GSM specifications to obtain equivalent limits for Output RF Spectrum measurements using 3-pole synchronously tuned measurement filter. The adjusted Output RF Spectrum limits are based on a 3-pole filter are shown in Table 3 and Table 4.

Table 1	3-Pole Specification Difference Output RF Spectrum due to Modulation
			Offset from Carrier (kHZ)
		100	200	250	400	600 to
						1800
	Difference (dB)	0	2.5	1.0	9.0	0

Table 2	3-Pole Specification Difference Output RF Spectrum due to Switching
			Offset from Carrier (kHZ)
		400		600	1200	1800
	Difference (dB)	6		4	2	0
NOTE	It is important to note that these values are estimates based on simulation and
	measurements. They are intended to allow the user to estimate their transmitters
	conformance to GSM Output RF Spectrum requirements.

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