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Report No.: EM201300221-5                     Application No.:  ZJ00028648                         Page 21 of 68 

 

FCC ID: 

APISPARK  

 

 

Report No.: EM201300221-5                     Application No.:  ZJ00028648                         Page 22 of 68 

 

FCC ID: 

APISPARK  

Regulation 15.247(a)(1)(iii) Frequency hopping systems in the 2400-2483.5 MHz band shall use at 
least 15 channels. The average time of occupancy on any channel shall not be greater than 0.4 
seconds within a period of 0.4 seconds multiplied by the number of hopping channels employed. 
Frequency hopping systems may avoid or suppress transmissions on a particular hopping 
frequency provided that a minimum of 15 channels are used. 

1.  Remove the antenna from the EUT and then connect a low RF cable from the antenna port to 

the spectrum. 

2.  Set spectrum analyzer span = 0. centered on a hopping channel; 

3.  Set RBW = 1MHz and VBW = 3MHz.Sweep = as necessary to capture the entire dwell time 

per hopping channel. Detector Function = Peak. Trace = Max hold; 

4.  Use the marker-delta function to determine the dwell time.  If this value varies with different 

modes of operation (e.g.. data rate. modulation format. etc.). repeat this test for each 
variation.  The limit is specified in one of the subparagraphs of this Section.  Submit this 
plot(s). An oscilloscope may be used instead of a spectrum analyzer. 
 

 
 
 

 
The test period: T= 0.4 Second/Channel x 79 Channel = 31.6 s 

Channel 0: 

2.402GHz 

 
DH1 time slot =0.387 (ms) * (1600/(2*79)) * 31.6 = 123.840 ms   
DH3 time slot =1.651 (ms) * (1600/(4*79)) * 31.6 = 264.160 ms    
DH5 time slot =2.918 (ms) * (1600/(6*79)) * 31.6 = 311.253 ms 

 

2DH1 time slot =0.411 (ms) * (1600/(2*79)) * 31.6 = 131.520 ms 
2DH3 time slot =1.659 (ms) * (1600/(4*79)) * 31.6 = 265.440 ms 
2DH5 time slot =1.707 (ms) * (1600/(6*79)) * 31.6 = 182.080 ms 

 

3DH1 time slot =0.409 (ms) * (1600/(2*79)) * 31.6 = 130.880 ms 
3DH3 time slot =1.673 (ms) * (1600/(4*79)) * 31.6 = 267.680 ms 
3DH5 time slot= 2.921 (ms) * (1600/(6*79)) * 31.6 = 311.573 ms 

 

EUT 

Spectrum analyzer 

Report No.: EM201300221-5                     Application No.:  ZJ00028648                         Page 23 of 68 

 

FCC ID: 

APISPARK  

: 2.441GHz 

 

DH1 time slot = 0.392 (ms) * (1600/(2*79)) * 31.6 = 125.440 ms 
DH3 time slot = 1.656 (ms) * (1600/(4*79)) * 31.6 = 264.960 ms 
DH5 time slot = 2.920 (ms) * (1600/(6*79)) * 31.6 = 311.467 ms 

 

2DH1 time slot = 0.409 (ms) * (1600/(2*79)) * 31.6 = 130.880 ms 
2DH3 time slot = 1.689 (ms) * (1600/(4*79)) * 31.6 = 263.040 ms 
2DH5 time slot = 1.721 (ms) * (1600/(6*79)) * 31.6 = 183.573 ms 

 

3DH1 time slot =0.411 (ms) * (1600/(2*79)) * 31.6 = 131.520 ms 
3DH3 time slot =1.675 (ms) * (1600/(4*79)) * 31.6 = 268.000 ms 
3DH5 time slot =2.923 (ms) * (1600/(6*79)) * 31.6 = 311.787 ms 

 

 2.480GHz 

DH1 time slot =0.397 (ms) * (1600/(2*79)) * 31.6 = 127.040 ms 
DH3 time slot =1.669 (ms) * (1600/(4*79)) * 31.6 = 271.840 ms 
DH5 time slot =2.886 (ms) * (1600/(6*79)) * 31.6 = 307.840 ms 

 

2DH1 time slot =0.396 (ms) * (1600/(2*79)) * 31.6 = 126.720 ms 
2DH3 time slot =1.644 (ms) * (1600/(4*79)) * 31.6 = 263.040 ms 
2DH5 time slot =1.708 (ms) * (1600/(6*79)) * 31.6 = 182.186 ms 

 

3DH1 time slot=0.403 (ms) * (1600/(2*79)) * 31.6 = 128.960 ms 
3DH3 time slot=1.651 (ms) * (1600/(4*79)) * 31.6 = 264.160 ms 
3DH5 time slot=2.915 (ms) * (1600/(6*79)) * 31.6 = 310.933 ms 
 
The results are not greater than 0.4 seconds. 
The unit does meet the requirements. 

 

Please refer the graph as below: 

 
 

Report No.: EM201300221-5                     Application No.:  ZJ00028648                         Page 24 of 68 

 

FCC ID: 

APISPARK  

1. Lowest channel (2.402 GHz): 

DH1 

DH3: