Anritsu S251C 4-20, Antenna-to-AntennaIsolation Measurement, Measurements, Required Equipment

Chapter 4 Measurements

Antenna-to-Antenna Isolation Measurement

Antenna-to-Antenna isolation measurement is accomplished in Insertion Loss Mode. Inser- tion Loss Mode (+ 6 dBm) is used to drive the signal level large enough to be detected by the second antenna system. The Insertion Gain Mode (–30 dBm level) does not output enough power to provide an accurate measurement of Antenna-to-Antenna isolation .

Required Equipment

￿Site Master Model S251C

￿Test Port Extension Cable, Anritsu 15NNF50-1.5C (2 each)

￿Adapter, Anritsu 36NN50A

Procedure
Step 1.	Press the MODE key.
Step 2.	Select INSERTION LOSS (+6 dBm) using the Up/Down arrow key and press
	ENTER.
Step 3.	Set the frequency range for the antenna system. The table below indicates fre-
	quency settings for common systems.
Operation		System	F1 - Start Frequency	F2 - Stop Frequency
Mode			(MHz)	(MHz)
		CELLULAR	806	960
Insertion Loss
		PCS	1850	1990
(+6 dBm)
		GSM	1800	1900

Step 4. Perform a full two port calibration of the Site Master (see page 3-4). The cali- bration will provide a 0 dB reference level as shown in Figure 4-16.

Figure 4-16. Calibration Reference Level

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