User's Manual

BBX2 Gain Set Point vs. BTS Output Considerations
08/01/2001
C-1
1X SCt4812ET Lite BTS Optimization/ATP
PRELIMINARY
Usage & Background
Table C-1 outlines the relationship between the total of all code domain
channel element gain settings (digital root sum of the squares) and the
BBX2 Gain Set Point between 33.0 dBm and 44.0 dBm. The resultant
RF output (as measured at the top of the BTS in dBm) is shown in the
table. The table assumes that the BBX2 Bay Level Offset (BLO) values
have been calculated.
As an illustration, consider a BBX2 keyed up to produce a CDMA
carrier with only the Pilot channel (no MCCs forward link enabled).
Pilot gain is set to 262. In this case, the BBX2 Gain Set Point is shown
to correlate exactly to the actual RF output anywhere in the 33 to 44
dBm output range. (This is the level used to calibrate the BTS).
Table C-1: BBX2 Gain Set Point vs. Actual BTS Output (in dBm)
dBm'
Gainb
44 43 42 41 40 39 38 37 36 35 34 33
541 – – – – – – – 43.3 42.3 41.3 40.3 39.3
533 – – – – – – – 43.2 42.2 41.2 40.2 39.2
525 – – – – – – – 43 42 41 40 39
517 – – – – – – – 42.9 41.9 40.9 39.9 38.9
509 – – – – – – – 42.8 41.8 40.8 39.8 38.8
501 – – – – – – – 42.6 41.6 40.6 39.6 38.6
493 – – – – – – 43.5 42.5 41.5 40.5 39.5 38.5
485 – – – – – – 43.4 42.4 41.4 40.4 39.4 38.4
477 – – – – – – 43.2 42.2 41.2 40.2 39.2 38.2
469 – – – – – – 43.1 42.1 41.1 40.1 39.1 38.1
461 – – – – – – 42.9 41.9 40.9 39.9 38.9 37.9
453 – – – – – – 42.8 41.8 40.8 39.8 38.8 37.8
445 – – – – – 43.6 42.6 41.6 40.6 39.6 38.6 37.6
437 – – – – – 43.4 42.4 41.4 40.4 39.4 38.4 37.4
429 – – – – – 43.3 42.3 41.3 40.3 39.3 38.3 37.3
421 – – – – – 43.1 42.1 41.1 40.1 39.1 38.1 37.1
413 – – – – – 43 42 41 40 39 38 37
405 – – – – – 42.8 41.8 40.8 39.8 38.8 37.8 36.8
397 – – – – 43.6 42.6 41.6 40.6 39.6 38.6 37.6 36.6
389 – – – – 43.4 42.4 41.4 40.4 39.4 38.4 37.4 36.4
. . . continued on next page
C