User Manual

Appendix C: BBX Gain Set Point vs. BTS Output Considerations

Jan 2002

C-1

SC4812ET BTS Optimization/ATP — CDMA LMF

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

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 C-1: BBX Gain Set Point vs. Actual BTS Output (in dBm)

dBm

Gain

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

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