Anritsu S251C manual TMA Gain Measurement After Calibration

Chapter 4 Measurements

Step 8. Press the SYS key, then OPTIONS, then BIAS TEE to turn on the bias tee volt- age. The gain is the level change before and after the bias tee voltage is turned on.

Step 9. Press the AUTO SCALE key, or press the AMPLITUDE key to adjust the top and bottom scale, to display the gain level.

Step 10. Press the MARKER key and set marker set M1 to 834 MHz and marker M2 to 883 MHz.

REFERENCE LEVEL	GAIN MEASURED WITH
AFTER CALIBRATION
	BIAS TEE ACTIVATED

Gain/Insertion Loss

2-PORT CAL

			M1: .01 dB @ 833.68 MHz					M2: .00 dB @ 882.99 MHz
15
10
5
dB
0	Limit : 0.00
-5
					M1					M2
-10
	800	810	820	830	840	850	860	870	880	890	900
					Frequency (800.0 - 906.0

Resolution: 130	CAL: ON(COAX)
Date: 06/13/2001	Time: 15:52:43

Gain/Insertion Loss

						TMA
20		M1: 12.90 dB @ 833.68 MHz					M2: -.92 dB @ 882.99 MHz
10
0	Limit : 0.00
-10
-20
dB-30
-40
-50
-60
-70					M1				M2
800		810	820	830	840	850	860	870	880	890	900
				Frequency (800.0 - 906.0 MHz)

Resolution: 130	CAL: ON(COAX)
Date: 06/13/2001	Time: 15:38:07

Figure 4-9. TMA Gain Measurement After Calibration

Marker M1 set at 834 MHz indicates the receive band of the tower mounted amplifier. The level above the 0 dB reference level is the gain of the TMA. Marker M2 set at 883 MHz in- dicates the transmit band of the amplifier where there is no gain.

Gain/Insertion Loss

TMA-S CELLULAR

(dB)	20	M1: 13.57 dB @ 836.82 MHz
	10
Transmission
	0
	-10
	-20
	-30
	-40
	-50
	-60
	-70					M1
		750	775	800	825	850	875	900	925
				Frequency (750.0 - 925.0 MHz)

Figure 4-10. TMA-S Gain Measurement

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