Report No.: CTA23112800502
RF Conducted Emissions Measurements
The following sections detail RF conducted emissions measurements across different modulations and frequency bands, as captured by a Keysight Spectrum Analyzer.
GFSK (CH78)
Frequency Range: 2.480000000 GHz (Center Frequency)
Span: 1.500 MHz
RBW: 100 kHz, VBW: 300 kHz
Markers: Mkr1 at 2.4800450 GHz with 2.888 dBm.
π/4DQPSK (CH00)
Frequency Range: 2.402000000 GHz (Center Frequency)
Span: 1.500 MHz
RBW: 100 kHz, VBW: 300 kHz
Markers: Mkr1 at 2.4020180 GHz with -1.280 dBm.
30MHz-1G
Center Frequency: 515.000000 MHz
Span: 1.000 GHz (30.000 MHz to 1.000 GHz)
RBW: 100 kHz, VBW: 300 kHz
Markers: Mkr1 at 914.06 MHz with -60.150 dBm (Page 35, Left); Mkr1 at 872.64 MHz with -59.965 dBm (Page 35, Right).
1G-25G
Center Frequency: 13.750000000 GHz
Span: 25.500 GHz (1.00 GHz to 26.50 GHz)
RBW: 100 kHz, VBW: 300 kHz
Markers: Mkr2 at 25.03290 GHz with -44.034 dBm (Page 35, Left); Mkr2 at 24.53140 GHz with -43.824 dBm (Page 35, Right).
π/4DQPSK (CH39)
Frequency Range: 2.441000000 GHz (Center Frequency)
Span: 1.500 MHz
RBW: 100 kHz, VBW: 300 kHz
Markers: Mkr1 at 2.4408110 GHz with 1.646 dBm.
π/4DQPSK (CH78)
Frequency Range: 2.480000000 GHz (Center Frequency)
Span: 1.500 MHz
RBW: 100 kHz, VBW: 300 kHz
Markers: Mkr1 at 2.4799685 GHz with 2.192 dBm.
8DPSK (CH00)
Frequency Range: 2.402000000 GHz (Center Frequency)
Span: 1.500 MHz
RBW: 100 kHz, VBW: 300 kHz
Markers: Mkr1 at 2.4019940 GHz with 2.065 dBm.
8DPSK (CH39)
Frequency Range: 2.441000000 GHz (Center Frequency)
Span: 1.500 MHz
RBW: 100 kHz, VBW: 300 kHz
Markers: Mkr1 at 2.4409865 GHz with 1.847 dBm.
8DPSK (CH78)
Frequency Range: 2.480000000 GHz (Center Frequency)
Span: 1.500 MHz
RBW: 100 kHz, VBW: 300 kHz
Markers: Mkr1 at 2.4800015 GHz with -0.233 dBm.
Band-edge Measurements for RF Conducted Emissions
These plots show RF conducted emissions at the band edges for different modulations.
GFSK
Left Band edge hoping off: Frequency range 2.3000 GHz to 2.4050 GHz. Markers indicate emissions such as Mkr5 at 2.383055 GHz with -52.814 dBm.
Right Band edge hoping off: Frequency range 2.4700 GHz to 2.5500 GHz. Markers indicate emissions such as Mkr4 at 2.49920 GHz with -50.737 dBm.
Left Band edge hoping on: Frequency range 2.3000 GHz to 2.4050 GHz. Markers indicate emissions such as Mkr5 at 2.387150 GHz with -51.502 dBm.
Right Band edge hoping on: Frequency range 2.4700 GHz to 2.5500 GHz. Markers indicate emissions such as Mkr4 at 2.50240 GHz with -52.469 dBm.
π/4DQPSK
Left Band edge hoping off: Frequency range 2.3000 GHz to 2.4050 GHz. Markers indicate emissions such as Mkr5 at 2.381900 GHz with -52.170 dBm.
Right Band edge hoping off: Frequency range 2.4700 GHz to 2.5500 GHz. Markers indicate emissions such as Mkr4 at 2.50312 GHz with -50.691 dBm.
Left Band edge hoping on: Frequency range 2.3000 GHz to 2.4050 GHz. Markers indicate emissions such as Mkr5 at 2.388515 GHz with -52.315 dBm.
Right Band edge hoping on: Frequency range 2.4700 GHz to 2.5500 GHz. Markers indicate emissions such as Mkr4 at 2.50224 GHz with -51.796 dBm.
8DPSK
Left Band edge hoping off: Frequency range 2.3000 GHz to 2.4050 GHz. Markers indicate emissions such as Mkr5 at 2.383055 GHz with -52.814 dBm.
Right Band edge hoping off: Frequency range 2.4700 GHz to 2.5500 GHz. Markers indicate emissions such as Mkr4 at 2.49920 GHz with -50.737 dBm.
Left Band edge hoping on: Frequency range 2.3000 GHz to 2.4050 GHz. Markers indicate emissions such as Mkr5 at 2.387150 GHz with -51.502 dBm.
Right Band edge hoping on: Frequency range 2.4700 GHz to 2.5500 GHz. Markers indicate emissions such as Mkr4 at 2.50240 GHz with -52.469 dBm.
4.9 Pseudorandom Frequency Hopping Sequence
TEST APPLICABLE - For 47 CFR Part 15C section 15.247 (a) (1) requirement:
Frequency hopping systems must have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth of the hop-ping channel, whichever is greater. Alternatively, for systems operating in the 2400–2483.5 MHz band, frequencies can be separated by 25 kHz or two-thirds of the 20 dB bandwidth, provided output power is no greater than 125 mW. The system must hop to channel frequencies selected from a pseudo-randomly ordered list, with each frequency used equally on average. Receivers must have input bandwidths matching the hopping channel bandwidths and synchronize frequencies with transmitted signals.
EUT Pseudorandom Frequency Hopping Sequence Requirement
The pseudorandom frequency hopping sequence is generated by a 9-stage shift register. The 5th and 9th stage outputs are added via a modulo-two addition stage, and the result feeds back to the first stage. The sequence starts with nine consecutive ones.
- Number of shift register stages: 9
- Length of pseudo-random sequence: 29-1 = 511 bits
- Longest sequence of zeros: 8 (non-inverted signal)
An example of a pseudorandom frequency hopping sequence is provided, showing a sequence of numbers representing channel selections.
All frequencies are used equally on average by each transmitter. System receivers must match the hopping channel bandwidths and synchronize with transmitted signals.
4.10 Antenna Requirement
Standard Applicable
According to FCC 47 CFR Section 15.203, intentional radiators must be designed to use only the antenna furnished by the responsible party. According to FCC 47 CFR Section 15.247 (c), if transmitting antennas with directional gain greater than 6dBi are used, the power must be reduced accordingly.
Refer to statement below for compliance
The manufacturer may allow user replacement of a broken antenna, but standard antenna jacks or electrical connectors are prohibited. This requirement does not apply to intentional radiators requiring professional installation.
Antenna Connected Construction
The maximum gain of the antenna was 0.00 dBi.
Remark: The antenna gain is provided by the customer. Shenzhen CTA Testing Technology Co., Ltd. assumes no responsibility if the provided data is inaccurate.
5 Test Setup Photos of the EUT
6 Photos of the EUT
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