User's Manual Part 2

TX Spectral Purity Transmit Mask Acceptance Test
08/01/2001
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1X SCt4812ET Lite BTS Optimization/ATP
PRELIMINARY
Background
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 connector.
Pilot gain will be set to 541 for each antenna, and the forward link will
be disabled for all Traffic CHannel (TCH) elements from the MCCs. The
BBX2 will be keyed up using both
bbxlvl and bay level offsets, to
generate a CDMA carrier (with pilot channel element only). RF output
will be set at 40 dBm as measured at the appropriate TX output.
The calibrated communications test set will measure and return the
attenuation level of all spurious and IM products with respect to the
mean power of the CDMA channel measured in a 1.23 MHz bandwidth,
in dB, verifying that results meet system tolerances at the following test
points (see also Figure 4-1):
S For 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
S For 1.9 GHz:
– At least –45 dB @ + 900 kHz from center frequency
– At least –45 dB @ – 900 kHz from center frequency
The BBX2 will then dekey, and if selected, the redundant BBX2 will be
assigned to the current TX antenna path under test. The test will then be
repeated.
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