JBL ON BEAT RUMBLE (serv.man4) EMC - CB Certificate ▷ View online
Report No.: EM201200813-4
Application No.:
ZJ00024740
Page 45 of 53
5. RECEIVER REQUIREMENTS
5.1 RECEIVER SPURIOUS EMISSIONS
5.1.1 LIMITS
Frequency range
Limit
30 MHz to 1 GHz
-57 dBm
above 1 GHz to 12,75 GHz
-47 dBm
5.1.2 TEST PROCEDURE
EIRP emission test method as below
1. The EUT shall operate on receive mode. And Interface cables, loads, and devices should be
connected to at least one of each type of the interface ports of the EUT and, where practical,
each cable shall be terminated in a device typical for its actual use. EUT shall be placed at the
1.5m support on the turntable.
each cable shall be terminated in a device typical for its actual use. EUT shall be placed at the
1.5m support on the turntable.
2. The test antenna at a horizontal distance of 3 m .It shall be raised and lowered from 1m to 4m
until a maximum signal level is detected by the measuring receiver. Then the turntable should
be rotated through 360° in the horizontal plane, until the maximum signal level is detected by
the measuring receiver. in both the vertical and the horizontal polarization. Record the reading
level, antenna position, polarization and turntable position.
be rotated through 360° in the horizontal plane, until the maximum signal level is detected by
the measuring receiver. in both the vertical and the horizontal polarization. Record the reading
level, antenna position, polarization and turntable position.
3. Remove the EUT and replace it with a substitution antenna (the antenna should be
half-wavelength for each frequency involved). The center of the substitution antenna should be
approximately at the same location as the center of the transmitter. For frequencies of 80 MHz
and above, the dipoles should have theirarm lengths set for resonance at the frequency of test.
Below 80 MHz, shortened arm lengths are recommended. For measurements above 1 000 MHz,
a waveguide horn is recommended. The centre of this antenna should coincide with either the
phase centre or volume centre.
approximately at the same location as the center of the transmitter. For frequencies of 80 MHz
and above, the dipoles should have theirarm lengths set for resonance at the frequency of test.
Below 80 MHz, shortened arm lengths are recommended. For measurements above 1 000 MHz,
a waveguide horn is recommended. The centre of this antenna should coincide with either the
phase centre or volume centre.
4. Feed the substitution antenna at the EUT end with a signal generator connected to the antenna
by a cable. With the antennas at both ends vertically polarized, and with the signal generator
tuned to a particular test frequency, raise and lower the test antenna to obtain a maximum
reading at the spectrum analyzer. Adjust the level of the signal generator output until the
previously recorded maximum reading for this set of conditions is obtained. This should be
done carefully repeating the adjustment of the test antenna and generator output.
tuned to a particular test frequency, raise and lower the test antenna to obtain a maximum
reading at the spectrum analyzer. Adjust the level of the signal generator output until the
previously recorded maximum reading for this set of conditions is obtained. This should be
done carefully repeating the adjustment of the test antenna and generator output.
EIRP(dBm) = Pg(dBm) – cable loss (dB) + antenna gain (dBd)
where:
Pg is the generator output power into the substitution antenna.
Pre-test the 3 modulation to find 8DPSK is worse case, so only record 8DPSK test data.
where:
Pg is the generator output power into the substitution antenna.
Pre-test the 3 modulation to find 8DPSK is worse case, so only record 8DPSK test data.
Report No.: EM201200813-4
Application No.:
ZJ00024740
Page 46 of 53
5.1.3 TEST SETUP
Below 1GHz
Above 1GHz
Below 1GHz
Above 1GHz
EUT
Ground Plane
3 m
1.5 m
Cable
Test table & Turntable
1m ~ 4m
EMI
Receiver
EUT
Ground Plane
3 m
1.5
m
m
Cable
Test table & Turntable
1m
EMI
Receiver
Report No.: EM201200813-4
Application No.:
ZJ00024740
Page 47 of 53
5.1.4 TEST RESULTS
Lowest Channel
Test in Channel lowest (2402MHz), keep in continuously receiving status
Maximum
Frequency
Spurious Emission
polarization and Level
Limit
Test Result
MHz
polarization
dBm
dBm
37.1416
V
-69.33
-57.00
Pass
10525.496 V
-60.00 -47.00
117.5345
H
-68.34
-57.00
6611.110 H
-60.00 -47.00
Note:
–70dBm was the minimum level which could be detected by measuring facility when below
1GHz, -60dBm at over 1GHz.
–70dBm was the minimum level which could be detected by measuring facility when below
1GHz, -60dBm at over 1GHz.
Highest Channel
Test in Channel lowest (2480MHz), keep in continuously receiving status
Maximum
Frequency
Spurious Emission
polarization and Level
Limit
Test Result
MHz
polarization
dBm
dBm
55.3525
V
-68.93
-57.00
Pass
7846.640 V
-60.00 -47.00
117.5345
H
-69.38
-57.00
10482.647 H
-59.89 -47.00
Note:
–70dBm was the minimum level which could be detected by measuring facility when below
1GHz, -60dBm at over 1GHz.
–70dBm was the minimum level which could be detected by measuring facility when below
1GHz, -60dBm at over 1GHz.
Report No.: EM201200813-4
Application No.:
ZJ00024740
Page 48 of 53
APPENDIX A: PHOTOGRAPH OF THE TEST ARRANGEMENT
Spurious Emission Test Setup
30MHz - 1GHz
Above 1GHz
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