User's Manual

Power Delta Calibration – continued

08/01/2001

H-13

1X SCt4812ET Lite BTS Optimization/ATP

PRELIMINARY

Table H-4: HP8921A Power Delta Calibration Procedure

Step Action

9 Set the measuring HP8921A as follows:

– Measure mode to CDMA Anl

– Frequency to the CDMA calibration target frequency

– Input Attenuation to 0 dB

– Input port to RF–IN

– Gain to Auto

– Analyzer Direction to Fwd

10 Turn on the source HP8921A signal output.

11 Measure and record the channel power reading on the measuring HP8921A as result

B ________________________.

12 Turn off the source HP8921A signal output and disconnect the equipment.

13 Compute the delta between HP437 and HP8921A using the following formula:

Delta = A – B

Example: Delta = –0.70 dBm – (–1.25 dBm) = 0.55 dBm

Example: Delta = 0.26 dBm – 0.55 dBm = –0.29 dBm

These examples are included to show the mathematics and do not represent actual readings.

NOTE

Add this delta value to the TX Cable Loss value during In–Service Calibration (see Step 4 in

Table H-6).

Figure H-7: Delta Calibration Setup – HP8921A to HP437

Short RF Cable

HP 8921A

DUPLEX

OUT

HP437B

Power

Sensor

SENSOR

FW00801