User's Manual

TX Spectral Purity Transmit Mask Acceptance Test
08/15/2000
4-9
SC 4812ETL 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.
The BDC Pilot Gain will be set to to 541 for each antenna, and the
forward link will be disabled for all TCH elements from the MCCs. The
BBX 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 At least –45 dB @ + 750 kHz from center frequency.
S At least –45 dB @ – 750 kHz from center frequency.
S At least –60 dB @ + 900 kHz from center frequency.
S At least –60 dB @ – 900 kHz from center frequency.
S At least –60 dB @ –1980 kHz from center frequency.
S At least –60 dB @ + 1980 kHz from center frequency.
Spurious and IM products at + 900 kHz from center
frequency are also measured, but there is no pass/fail
criteria. This measurement is provided for information
purposes only.
NOTE
The BBX will then dekey, and if selected, the BDC will be
re–configured to assign the applicable redundant BBX to the current TX
antenna path under test. The test will then be repeated.
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