Anritsu S251C manual 4-21/4-22, Gain/Insertion Loss, L ev el, Measurements

Chapter 4 Measurements

Step 5. Disconnect the Tx (Transmit) coax from System 1 and connect it to the RF Out port of the Site Master.

Step 6. Disconnect the Rx (Receive) coax from System 2 and connect it to the RF In port of the Site Master.

Step 7. Adjust the scale, either manually or by using the AUTO SCALE key, to display the isolation level in the center of the display.

Step 8. Press the MARKER key and set markers M1 and M2 to identify the receive band of the amplifier.

Step 9. Press the LIMIT key and set the limit line to the estimated average signal level. Figure 4-17displays a typical antenna isolation measurement display.

R x Gain/Insertion Loss

R F In p u t
T x
R F O u tp u t	A n ten n a
Site Master S251C	Is o latio n
	L ev el
S ite Mas ter S 251C	R x

Figure 4-17. Typical Antenna Isolation Measurement Display

Typical antenna-to antenna isolation measurements are made between –50 dB and –100 dB below the 0 dB reference line established by the 2-port calibration.

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