Anritsu S251C - Manual (Page 67)

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
q Site Master Model S251C
q Test Port Extension Cable, Anritsu 15NNF50-1.5C (2 each)
q 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.
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.
4-20
Chapter 4 Measurements
Operation
Mode
System
F1 - Start Frequency
(MHz)
F2 - Stop Frequency
(MHz)
Insertion Loss
(+6 dBm)
CELLULAR 806 960
PCS 1850 1990
GSM 1800 1900
Figure 4-16. Calibration Reference Level