JBL VOYAGER EMC - CB Certificate ▷ View online
Report No.: EM201300534-1 Application No.:
ZJ00032799 Page 45 of 56
4.7 TRANSMITTER SPURIOUS EMISSIONS
4.7.1 LIMITS
Frequency range
Limit when operating
Limit when in standby
30 MHz to 1 GHz
-36 dBm
-57 dBm
above 1 GHz to 12,75 GHz
-30 dBm
-47 dBm
1,8 GHz to 1,9 GHz
5,15 GHz to 5,3 GHz
-47 dBm
-47 dBm
4.7.2 TEST PROCEDURE
EIRP emission test method as below
1. The EUT shall be performed at the highest power level at which the transmitter is
intended to operate.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.
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.
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.
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.
3. Remove the transmitter 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 their arm 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.
should be approximately at the same location as the center of the transmitter. For
frequencies of 80 MHz and above, the dipoles should have their arm 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 transmitter 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.
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.
EIRP(dBm) = Pg(dBm) – cable loss (dB) + antenna gain (dBd)
where:
Pg is the generator output power into the substitution antenna.
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.: EM201300534-1 Application No.:
ZJ00032799 Page 46 of 56
4.7.3 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
1.5m
EMI
Receiver
Report No.: EM201300534-1 Application No.:
ZJ00032799 Page 47 of 56
4.7.4 TEST RESULTS
1. Lowest Channel: 2402MHz
30M-1000MHz Spurious Emissions Peak Measurement
No. Frequency
Reading
Correct
Result
Limit
Margin
Remark
(MHz)
(dBm)
Factor(dB)
(dBm)
(dBm)
(dB)
1
31.3795 -90.37 28.57 -61.80
-36.00
-25.80 Vertical
2
55.0423 -88.11 18.87 -69.24
-36.00
-33.24 Vertical
3
84.3675 -85.50 19.03 -66.47
-36.00
-30.47 Vertical
4
88.2469 -85.64 19.44 -66.20
-36.00
-30.20 Vertical
5
106.8259 -83.99 19.66 -64.33
-36.00 -28.33 Vertical
6
190.5677 -89.27 21.46 -67.81
-36.00 -31.81 Vertical
7
91.2728 -81.23 19.66 -61.57
-36.00
-25.57
Horizontal
8
102.1298 -83.68 19.88 -63.80
-36.00 -27.80
Horizontal
9
106.8259 -78.80 19.66 -59.14
-36.00 -23.14
Horizontal
10
112.3675 -84.00 19.34 -64.66
-36.00 -28.66
Horizontal
11
256.6825 -91.22 23.85 -67.37
-36.00 -31.37
Horizontal
12
319.5776 -84.02 26.20 -57.82
-36.00 -21.82
Horizontal
1000MHz-12750MHz Spurious Emissions Peak Measurement
No. Frequency
Reading
Correct
Result
Limit
Margin Remar
k
(MHz)
(dBm)
Factor(dB)
(dBm)
(dBm)
(dB)
1
1832.434 -69.17 13.45 -55.72 -47.00 -8.72
Vertical
2
1908.159 -66.14 13.73 -52.41 -30.00 -22.41
Vertical
3
1959.223 -68.87 13.91 -54.96 -30.00 -24.96
Vertical
4
3696.190 -76.50 12.48 -64.02 -30.00 -34.02
Vertical
5
4916.085 -77.96 16.49 -61.47 -30.00 -31.47
Vertical
6
12314.157 -78.93 25.98
-52.95 -30.00 -22.95
Vertical
7
1868.268 -75.51 13.59 -61.92 -47.00 -14.92
Horizont
8
1911.522 -70.51 13.74 -56.77 -30.00 -26.77
Horizont
9
2015.198 -67.74 14.15 -53.59 -30.00 -23.59
Horizont
10
3687.629 -76.98 12.47 -64.51 -30.00 -34.51
Horizont
11
5197.425 -80.23 16.61 -63.62 -47.00 -16.62
Horizont
12
9971.595 -80.13 25.65 -54.48 -30.00 -24.48
Horizont
Report No.: EM201300534-1 Application No.:
ZJ00032799 Page 48 of 56
2. Middle Channel: 2441MHz
30M-1000MHz Spurious Emissions Peak Measurement
No.
Frequency Reading
Correct
Result
Limit
Margin
Remark
(MHz)
(dBm)
Factor(dB)
(dBm)
(dBm)
(dB)
1
31.0288 -88.93 28.79
-60.14 -36.00 -24.14 Vertical
2
56.2935 -87.50 18.65
-68.85 -36.00 -32.85 Vertical
3
83.8947 -84.95 18.98
-65.97 -36.00 -29.97 Vertical
4
106.8259 -84.32 19.66
-64.66 -36.00 -28.66 Vertical
5
252.3916 -93.03 23.74
-69.29 -36.00 -33.29 Vertical
6
295.3991 -93.28 24.91
-68.37 -36.00 -32.37 Vertical
7
88.2468 -80.85 19.44
-61.41 -36.00 -25.41
Horizontal
8
106.8259 -76.67 19.66
-57.01 -36.00 -21.01
Horizontal
9
138.3376 -86.76 19.10
-67.66 -36.00 -31.66
Horizontal
10
206.1656 -89.17 21.72
-67.45 -36.00 -31.45
Horizontal
11
288.8331 -87.98 24.71
-63.27 -36.00 -27.27
Horizontal
12
334.2722 -89.98 26.80
-63.18 -36.00 -27.18
Horizontal
1000MHz-12750MHz Spurious Emissions Peak Measurement
No
.
Frequency Reading
Correct
Result
Limit Margin Remark
(MHz)
(dBm)
Factor(dBm)
(dBm)
(dBm)
(dB)
1
1829.211 -69.98 13.44 -56.54
-47.00
-9.54 Vertical
2
1908.159 -65.44 13.73 -51.71
-30.00
-21.71
Vertical
3
1962.675 -70.45 13.92 -56.53
-30.00
-26.53
Vertical
4
3687.629 -76.74 12.47 -64.27
-30.00
-34.27
Vertical
5
4859.418 -78.70 16.29 -62.41
-30.00
-32.41
Vertical
6
12603.031 -79.02
26.79 -52.23
-30.00
-22.23 Vertical
7
1741.223 -73.99 13.00 -60.99
-30.00
-30.99
Horizontal
8
1868.268 -73.22 13.59 -59.63
-47.00
-12.63
Horizontal
9
1911.522 -71.22 13.74 -57.48
-30.00
-27.48
Horizontal
10
3662.066 -76.41 12.38 -64.03
-30.00
-34.03
Horizontal
11
8283.272 -80.38 23.81 -56.57
-30.00
-26.57
Horizontal
12
12486.677 -78.82
26.37 -52.45
-30.00
-22.45
Horizontal
Click on the first or last page to see other VOYAGER service manuals if exist.