User Manual
Power Delta Calibration – continued
Jan 2002
G-3
SC4812ET BTS Optimization/ATP — CDMA LMF
Table G-1: HP8921A Power Delta Calibration Procedure
Step Action
5 Turn off the source HP8921A signal output, and disconnect the HP437B.
NOTE
Leave the settings on the source HP8921A for convenience in the following steps.
6 Connect the short RF cable between the source HP8921A Duplex Out port and the measuring
HP8921A RF–IN port (see Figure G-2).
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.
G