User's Manual

Power Delta Calibration
68P09258A31–A
Oct 2003
1X SCt 4812T BTS Optimization/ATP
H-4
Table H-1: HP8921A Power Delta Calibration Procedure
Step Action
7 Ensure that the source HP8921A settings are the same as in Step 2.
8 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
9 Turn on the source HP8921A signal output.
10 Measure and record the channel power reading on the measuring HP8921A as result
B ________________________.
11 Turn off the source HP8921A signal output and disconnect the equipment.
12 Compute the delta between HP437B 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-5).
Figure H-1: Delta Calibration Setup – HP8921A to HP437B
Short RF Cable
HP 8921A
DUPLEX
OUT
HP437B
Power
Sensor
SENSOR
FW00801
H