User Manual

BBX Gain Set Point vs. BTS Output Considerations
5/21/04 1X SC4812T–MC BTS Optimization/ATP D-1
DRAFT
Usage & Background
Table D-1 outlines the relationship between the total of all code domain
channel element gain settings (digital root sum of the squares) and the
BBX 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 BBX Bay Level Offset (BLO) values have
been calculated.
As an illustration, consider a BBX 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 BBX 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 D-1: BBX 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 – – – – – – 44 43 42 41 40 39
517 – – – – – – 43.9 42.9 41.9 40.9 39.9 38.9
509 – – – – – – 43.8 42.8 41.8 40.8 39.8 38.8
501 – – – – – – 43.6 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 – – – – – 43.9 42.9 41.9 40.9 39.9 38.9 37.9
453 – – – – – 43.8 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 – – – – 44 43 42 41 40 39 38 37
405 – – – – 43.8 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
D