User's Manual

Individual ATP Test Background Information68P09258A31–A
Oct 2003
1X SCt 4812T BTS Optimization/ATP
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Individual ATP Test Background Information
TX Spectral Purity Transmit Mask Acceptance Test (Tx Mask)
This test verifies the spectral purity of each BBX carrier keyed up at a
specific frequency, per the current CDF file assignment. All tests are
performed using the external calibrated test set, controlled by the same
command. All measurements are via the appropriate TX OUT
(BTS/RFDS) connector.
The Pilot Gain is set to 541 for each antenna, and all channel elements
from the MCCs are forward-link disabled. The BBX is keyed up, using
both bbxlvl and bay level offsets, to generate a CDMA carrier (with pilot
channel element only). BBX power output is set to obtain +40 dBm as
measured at the TX OUT connector (on either the BTS or RFDS
directional coupler).
NOTE
TX output power is set to +40 dBm by setting BTS power level
to +33.5 dBm to compensate for 6.5 dB increase from pilot gain
set to 541.
The calibrated communications test set measures and returns the
attenuation level of all spurious and IM products in a 30 kHz resolution
bandwidth. With respect to the mean power of the CDMA channel
measured in a 1.23 MHz bandwidth in dB, verify that results meet
system tolerances at the following test points:
S 1.7/1.9 GHz:
– at least –45 dB @ + 900 kHz from center frequency
– at least –45 dB @ – 900 kHz from center frequency
S 800 MHz:
– at least –45 dB @ + 750 kHz from center frequency
– at least –45 dB @ – 750 kHz from center frequency
– at least –60 dB @ – 1980 kHz from center frequency
– at least –60 dB @ – 1980 kHz from center frequency
The BBX then de-keys, and, if selected, the MCC is re-configured to
assign the applicable redundant BBX to the current TX antenna path
under test. The test is then repeated.
See Table 4-1 to perform this test.
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