User's Manual Part 2

TX Spectral Purity Transmit Mask Acceptance Test
MAY 2004
7-11
1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU
PRELIMINARY
Background
Overview – This test verifies the spectral purity of each
operator–selected BBX carrier keyed up at a specific frequency specified
in the current CDF. All tests are performed using the external, calibrated
test equipment controlled by the same command. All measurements are
made at the appropriate BTS TX antenna connector.
Test Patterns – There are four operator–selectable test patterns with
which this acceptance test can be performed. The patterns, along with the
channels tested and gain setting for each, are listed in Table 6-33. Refer
to “TX Calibration and the LMF” in the Bay Level Offset Calibration
section for more information on the test patterns.
Equipment Operation During Testing – At least one MCC must be
selected to perform the Standard, CDF Pilot, and CDF test patterns. For
these test patterns, forward links will be enabled for synch channel
(SCH), paging channel (PCH), and traffic channel (TCH) elements from
the selected MCC(s), as shown in Table 6-33. Gain will be set for the
applicable channels on each antenna as shown in the table. The
operator–selected BBXs will be keyed using a BLO–corrected
bbxlvl
value to generate a CDMA carrier. RF output power, as measured at the
appropriate frame TX antenna connector, will be set to one of the
following depending on the operating frequency spectrum:
S 800 MHz: 33.5 dBm
Test Measurements – The test equipment will measure and return the
attenuation level in dB of all spurious and IM products with respect to
the mean power of the CDMA channel measured in a 1.23 MHz
bandwidth, verifying that results meet system tolerances at the following
test points (see also Figure 7-1):
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
Spectral Purity TX Mask
Acceptance Test
Follow the steps in Table 7-5 to verify the transmit spectral mask
specification on the TX antenna paths for the selected BBXs.
Table 7-5: Test Spectral Purity Transmit Mask
Step Action
1 Set up the test equipment for TX acceptance tests per Table 7-1.
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