Report No.: BL-SZ1680250-601
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5.4 Conducted Spurious Emission
5.4.1 Limit
FCC §15.247(d); RSS-247, 5.5
In any 100 kHz bandwidth outside the frequency band in which the spread spectrum or digitally modulated
intentional radiator is operating, the radio frequency power that is produced by the intentional radiator shall be at
least 20 dB below that in the 100 kHz bandwidth within the band that contains the highest level of the desired
power, based on either an RF conducted or a radiated measurement.
5.4.2 Test Setup
See section 4.4.1 for test setup description for the antenna port. The photo of test setup please refer to ANNEX B.
5.4.3 Test Procedure
The DTS rules specify that in any 100 kHz bandwidth outside of the authorized frequency band, the power shall
be attenuated according to the following conditions:
a) If the maximum peak conducted output power procedure was used to demonstrate compliance as described in
9.1, then the peak output power measured in any 100 kHz bandwidth outside of the authorized frequency band
shall be attenuated by at least 20 dB relative to the maximum in-band peak PSD level in 100 kHz (i.e., 20 dBc).
b) If maximum conducted (average) output power was used to demonstrate compliance as described in 9.2, then
the peak power in any 100 kHz bandwidth outside of the authorized frequency band shall be attenuated by at least
30 dB relative to the maximum in-band peak PSD level in 100 kHz (i.e., 30 dBc).
c) In either case, attenuation to levels below the 15.209 general radiated emissions limits is not required.
The following procedures shall be used to demonstrate compliance to these limits. Note that these procedures can
be used in either an antenna-port conducted or radiated test set-up. Radiated tests must conform to the test site
requirements and utilize maximization procedures defined herein.
Reference level measurement
Establish a reference level by using the following procedure:
Set instrument center frequency to DTS channel center frequency.
Set the span to
≥
1.5 times the DTS bandwidth.
Set the RBW = 100 kHz.
Set the VBW
≥
3 x RBW.
Detector = peak.
Sweep time = auto couple.
Trace mode = max hold.
Allow trace to fully stabilize.
Use the peak marker function to determine the maximum PSD level.
Содержание EAP245
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