UNII report_Part4

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Test Report

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                  Plot 9-148. 6-dB Bandwidth Chain 1 802.11a (Ch. 149)




                  Plot 9-149. 6-dB Bandwidth Chain 1 802.11a (Ch. 157)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 106 of 289
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                  Plot 9-150. 6-dB Bandwidth Chain 1 802.11a (Ch. 165)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 107 of 289
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9.4.5.3 Chain 0 802.11n HT20 6-dB Bandwidth
                         Chain 0 802.11n HT20 6-dB Bandwidth
        Channel No.                Frequency (MHz)          6-dB Bandwidth (MHz)
            144                          5720                       3.82
            149                          5745                      17.59
            157                          5785                      17.64
            165                          5825                      17.63




               Plot 9-151. 6-dB Bandwidth Chain 0 802.11n HT20 (Ch. 144)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 108 of 289
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               Plot 9-152. 6-dB Bandwidth Chain 0 802.11n HT20 (Ch. 149)




               Plot 9-153. 6-dB Bandwidth Chain 0 802.11n HT20 (Ch. 157)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 109 of 289
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               Plot 9-154. 6-dB Bandwidth Chain 0 802.11n HT20 (Ch. 165)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 110 of 289
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9.4.5.4 Chain 1 802.11n HT20 6-dB Bandwidth
                         Chain 1 802.11n HT20 6-dB Bandwidth
        Channel No.                Frequency (MHz)          6-dB Bandwidth (MHz)
            144                          5720                       3.91
            149                          5745                      17.62
            157                          5785                      17.61
            165                          5825                      17.62




               Plot 9-155. 6-dB Bandwidth Chain 1 802.11n HT20 (Ch. 144)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 111 of 289
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               Plot 9-156. 6-dB Bandwidth Chain 1 802.11n HT20 (Ch. 157)




               Plot 9-157. 6-dB Bandwidth Chain 1 802.11n HT20 (Ch. 157)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 112 of 289
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               Plot 9-158. 6-dB Bandwidth Chain 1 802.11n HT20 (Ch. 165)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 113 of 289
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9.4.5.5 Chain 0 802.11n HT40 6-dB Bandwidth
                         Chain 0 802.11n HT40 6-dB Bandwidth
        Channel No.                Frequency (MHz)          6-dB Bandwidth (MHz)
            151                          5755                      36.40
            159                          5795                      36.39
            142                          5710                       3.22




               Plot 9-159. 6-dB Bandwidth Chain 0 802.11n HT40 (Ch. 151)




               Plot 9-160. 6-dB Bandwidth Chain 0 802.11n HT40 (Ch. 159)

Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 114 of 289
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               Plot 9-161. 6-dB Bandwidth Chain 0 802.11n HT40 (Ch. 142)




9.4.5.6 Chain 1 802.11n HT40 6-dB Bandwidth
                         Chain 1 802.11n HT40 6-dB Bandwidth
        Channel No.                Frequency (MHz)          6-dB Bandwidth (MHz)
            151                          5755                      36.39
            159                          5795                      36.38
            142                          5710                       3.16




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 115 of 289
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               Plot 9-162. 6-dB Bandwidth Chain 1 802.11n HT40 (Ch. 151)




               Plot 9-163. 6-dB Bandwidth Chain 1 802.11n HT40 (Ch. 159)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 116 of 289
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               Plot 9-164. 6-dB Bandwidth Chain 1 802.11n HT40 (Ch. 142)


9.4.5.7 Chain 0 802.11ac VHT20 6-dB Bandwidth
                       Chain 0 802.11ac VHT20 6-dB Bandwidth
        Channel No.               Frequency (MHz)         6-dB Bandwidth (MHz)
            149                         5745                     17.61
            157                         5785                     17.63
            165                         5825                     17.59
            144                         5720                      3.82




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                 Page 117 of 289
                                  Microsoft EMC Laboratory


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              Plot 9-165. 6-dB Bandwidth Chain 0 802.11ac VHT20 (Ch. 149)




              Plot 9-166. 6-dB Bandwidth Chain 0 802.11ac VHT20 (Ch. 157)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 118 of 289
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              Plot 9-167. 6-dB Bandwidth Chain 0 802.11ac VHT20 (Ch. 165)




              Plot 9-168. 6-dB Bandwidth Chain 0 802.11ac VHT20 (Ch. 144)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 119 of 289
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9.4.5.8 Chain 1 802.11ac VHT20 6-dB Bandwidth
                       Chain 1 802.11ac VHT20 6-dB Bandwidth
        Channel No.               Frequency (MHz)         6-dB Bandwidth (MHz)
            149                         5745                     17.63
            157                         5785                     17.60
            165                         5825                     17.64
            144                         5720                      3.82




              Plot 9-169. 6-dB Bandwidth Chain 1 802.11ac VHT20 (Ch. 149)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 120 of 289
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              Plot 9-170. 6-dB Bandwidth Chain 1 802.11ac VHT20 (Ch. 157)




              Plot 9-171. 6-dB Bandwidth Chain 1 802.11ac VHT20 (Ch. 165)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 121 of 289
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              Plot 9-172. 6-dB Bandwidth Chain 1 802.11ac VHT20 (Ch. 144)




9.4.5.9 Chain 0 802.11ac VHT40 6-dB Bandwidth
                       Chain 0 802.11ac VHT40 6-dB Bandwidth
        Channel No.               Frequency (MHz)         6-dB Bandwidth (MHz)
            151                         5755                     36.37
            159                         5795                     36.40
            142                         5710                      3.22




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 122 of 289
                                  Microsoft EMC Laboratory


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              Plot 9-173. 6-dB Bandwidth Chain 0 802.11ac VHT40 (Ch. 151)




              Plot 9-174. 6-dB Bandwidth Chain 0 802.11ac VHT40 (Ch. 159)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 123 of 289
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              Plot 9-175. 6-dB Bandwidth Chain 0 802.11ac VHT40 (Ch. 142)


9.4.5.10 Chain 1 802.11ac VHT40 6-dB Bandwidth
                        Chain 1 802.11ac VHT40 6-dB Bandwidth
         Channel No.               Frequency (MHz)         6-dB Bandwidth (MHz)
             151                         5755                     36.37
             159                         5795                     36.38
             142                         5710                      3.10




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 124 of 289
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              Plot 9-176. 6-dB Bandwidth Chain 1 802.11ac VHT40 (Ch. 151)




              Plot 9-177. 6-dB Bandwidth Chain 1 802.11ac VHT40 (Ch. 159)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 125 of 289
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              Plot 9-178. 6-dB Bandwidth Chain 1 802.11ac VHT40 (Ch. 142)



9.4.5.11 Chain 0 802.11ac VHT80 6-dB Bandwidth
                        Chain 0 802.11ac VHT80 6-dB Bandwidth
         Channel No.               Frequency (MHz)         6-dB Bandwidth (MHz)
             155                         5775                     76.38
             138                         5690                      3.10




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 126 of 289
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              Plot 9-179. 6-dB Bandwidth Chain 0 802.11ac VHT80 (Ch. 155)




              Plot 9-180. 6-dB Bandwidth Chain 0 802.11ac VHT80 (Ch. 138)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 127 of 289
                                  Microsoft EMC Laboratory


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9.4.5.12 Chain 1 802.11ac VHT80 6-dB Bandwidth
                        Chain 1 802.11ac VHT80 6-dB Bandwidth
         Channel No.               Frequency (MHz)         6-dB Bandwidth (MHz)
             155                         5775                     75.85
             138                         5690                      3.10




              Plot 9-181. 6-dB Bandwidth Chain 1 802.11ac VHT80 (Ch. 155)




              Plot 9-182. 6-dB Bandwidth Chain 1 802.11ac VHT80 (Ch. 138)


Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                  Page 128 of 289
                                  Microsoft EMC Laboratory


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9.5 Maximum Conducted Output Power

       Test Requirement:
FCC CFR 47 Rule Part 15.407 (a)
ISED RSS-247 [6.2]

       Test Method:
Measurements were performed according to the procedures defined in KDBs 789033- General
UNII Test Procedures New Rules v02r01, 662911 D01 Multiple Transmitter Output v02r01, and
ANSI C63.10 2013.
Spectrum Analyzer settings:
Average Power:
RBW= 1 MHz
VBW= 3 MHz
Detector = RMS
Trace Mode= Average over 100 traces
Sweep time= Auto
Sweep Point ≥ 2*Span/RBW
Span= large enough to encompass the 26-dB Emission Bandwidth or alternatively the 99%
Occupied Bandwidth.
Use the band power measurement function to integrate the power over the 26-dB Emission
Bandwidth or 99% Occupied Bandwidth.

       Sample Calculation:
For MIMO, the total average power is calculated as follows,
Total Average Power= [10*LOG ((10^ (Power (Chain 0)/10) +10^ (Power (Chain 1)/10)] +DCF
For e.g.
Total Power= [10* LOG (10^ (17.54/10) +10^ (17.36/10))] +DCF = (20.46+0.14) =20.6dBm

       Limits:
15.407: The maximum conducted output power shall not exceed the limits given the following
table for antennas that do not exceed a directional gain > 6dBi:
  Band of Operation                                   15.407 Limit
          (MHz)
      5150 – 5250                                        24 dBm
      5250 – 5350                           24dBm or 11 dBm + 10 log (B)(1)
      5470 – 5725                           24dBm or 11 dBm + 10 log (B)(1)
      5725 – 5825                                        30 dBm
Note(1): B is the 26-dB Emission bandwidth of signal in MHz.
RSS-247: The maximum conducted output power and/or EIRP shall not exceed the limits given
the following table:




Report#: R-TR516-FCCISED-UNII-3          Issued: July 15, 2019                Page 129 of 289
                                      Microsoft EMC Laboratory


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  Band of Operation (MHz)              RSS-247 Conducted Output             RSS-247 E.I.R.P Limit
                                              Power Limit
          5150 – 5250                               --                    23 dBm or 10 + 10 log (B)(1)
          5250 – 5350                   24 dBm or 11 + 10 log (B)(1)      30 dBm or 17 + 10 log (B)(1)
          5470 – 5725                   24 dBm or 11 + 10 log (B)(1)      30 dBm or 17 + 10 log (B)(1)
          5725 – 5825                           30 dBm                                --
Note(1): B is the 99% Occupied Bandwidth of the signal in MHz.

Conducted Output Power and EIRP measurements for Straddle Channels, 5720, 5710 and
5690, were compared against the 5470 – 5725 MHz band limits which also demonstrates
compliance with the 5725 - 5825 MHz band. As the total power complies with the limits for both
bands the power within each band also complies with the limits of each band.
Limits for these channels were computed using only the portion of the bandwidth that falls
completely within the 5470 – 5725 band using the following formula.

                                   𝐡         𝑀𝐻𝑧                  5 𝑀𝐻𝑧,

Where,
𝐡      is the bandwidth portion falling completely within the 5470 – 5725 MHz Band.
𝐡      is the total measured 26-dB (FCC) or 99% bandwidth (ISED) of the emission in MHz.

                                                             .
e.g.        𝐡            𝑀𝐻𝑧 π‘“π‘œπ‘Ÿ 802.11π‘Ž 5720𝑀𝐻𝑧                        5 𝑀𝐻𝑧     14.6 𝑀𝐻𝑧
                 πΏπ‘–π‘šπ‘–π‘‘     _   .   π‘‘π΅π‘š      11 π‘‘π΅π‘š    10   log   14.6     22.64 π‘‘π΅π‘š

                  Straddle Channel Conducted Output Power and EIRP Limits
                                                               15.407            RSS-247       RSS-247
                                               Measured                                         E.I.R.P
                               Measured                      Conducted          Conducted
                                                Min 99%                                          Limit
 Straddle                      Min 26-dB                      Output              Output
                 Mode                          Occupied                                         (dBm)
 Channel                       Bandwidth                       Power              Power
                                               Bandwidth
                                 (MHz)                          Limit              Limit
                                                 (MHz)
                                                               (dBm)              (dBm)
   5720         802.11a            22.82           16.68        24.00              23.22         29.22

   5720         802.11n            23.21           17.88         24.00            23.52          29.52
                  HT20
   5720         802.11ac           25.48           17.89         24.00            23.53          29.53
                 VHT20
   5710         802.11n            42.73           36.43         24.00            24.00          30.00
                  HT40
   5710         802.11ac           42.35           36.47         24.00            24.00          30.00
                 VHT40
   5690         802.11ac           85.03           75.94         24.00            24.00          30.00
                 VHT80




Report#: R-TR516-FCCISED-UNII-3               Issued: July 15, 2019                         Page 130 of 289
                                           Microsoft EMC Laboratory


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       Test Results:
Pass. See Section 9.6.6 for test data.


9.6 Power Spectral Density

       Test Requirement:
FCC CFR 47 Rule Part 15.407 (a)
ISED RSS-247 [6.2]

       Test Method:
Measurements were performed according to the procedures defined in KDBs 789033- General
UNII Test Procedures New Rules v02r01, 662911 D01 Multiple Transmitter Output v02r01, and
ANSI C63.10 2013.
Spectrum Analyzer settings for devices operating in the bands 5.15 – 5.25 GHz, 5.25 –
5.35GHz, and 5.47 – 5.725GHz:
RBW= 1 MHz
VBW= 3 MHz
Detector = RMS
Trace Mode= Average over 100 traces
Sweep time= Auto
Sweep Point ≥ 2*Span/RBW
Span= large enough to encompass the 26-dB Emission Bandwidth or alternatively the 99%
Occupied Bandwidth. Use the peak marker function to identify the Maximum Power Spectral
Density

Spectrum Analyzer settings for devices operating in the bands 5.725 – 5.85 GHz:
RBW= 100 kHz
VBW= 300 kHz
Detector = RMS
Trace Mode= Average over 100 traces
Sweep time= Auto
Sweep Point ≥ 2*Span/RBW
Span= large enough to encompass the 26-dB Emission Bandwidth or alternatively the 99%
Occupied Bandwidth. Use the peak marker function to identify the Maximum Power Spectral
Density
Offset is added if measurements are performed using a reduced resolution bandwidth 100 kHz,
add 10* log (500KHz/RBW USED) to the measured result.


       Sample Calculation:
For MIMO, the total average PSD is calculated as follows,
Total PSD=10*LOG ((10^ (PSD (Chain 0)/10) +10^ (PSD (Chain 1)/10)
For e.g. Total PSD= 10* LOG (10^ (3.41/10) +10^ (2.41/10)) = 5.94dBm/100kHz



Report#: R-TR516-FCCISED-UNII-3       Issued: July 15, 2019                   Page 131 of 289
                                   Microsoft EMC Laboratory


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       Limits:
15.407: The Maximum Power Spectral Density shall not exceed the limits given the following
table for antennas that do not exceed a directional gain > 6dBi:
  Band of Operation                                   15.407 Limits
          (MHz)
      5150 – 5250                                      11dBm/MHz
      5250 – 5350                                      11dBm/MHz
      5470 – 5725                                      11dBm/MHz
      5725 – 5825                                    30dBm/500kHz

 Band of Operation                                RSS-247 Limits
       (MHz)
    5150 – 5250                                 10dBm/MHz e.i.r.p.
    5250 – 5350                                    11dBm/MHz
    5470 – 5725                                    11dBm/MHz
    5725 – 5825                                   30dBm/500kHz

For antenna gains >6dBi, the PSD limits are reduced by the amount it exceeds 6dBi.

       Test Results:
Pass.
PSD measurements for Straddle Channels, 5720, 5710 and 5690, were compared against the
5470 – 5725 MHz band limits demonstrating compliance with the less stringent 5725 - 5825
MHz band limits as well.




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019                     Page 132 of 289
                                  Microsoft EMC Laboratory


                                                                          FCC ID: C3K1855
                                                                         IC ID: 3048A-1855

      Test Data

9.6.6.1 Chain 0+1 802.11a Maximum Conducted Output Power
               Chain 0+1 802.11a Maximum Conducted Output Power
 Chan. Freq. Chain 0 Chain 1 Total        15.407 RSS-247 15.407            RSS-247
 No.     (MHz) (dBm)      (dBm)    Power Limit    Limit     Margin         Margin
                                   (dBm) (dBm) (dBm)        (dB)           (dB)
    36    5180     8.93      8.89   12.08  24.00      --     -11.92             --
    44    5220     9.03      9.12   12.25  24.00      --     -11.75             --
    48    5240     9.12      9.33   12.40  24.00      --     -11.60             --
    52    5260    16.51     16.39   19.62  24.00    23.21     -4.38           -3.59
    60    5300    16.42     16.34   19.55  24.00    23.21     -4.45           -3.66
    64    5320    16.12     16.23   19.35  24.00    23.22     -4.65           -3.87
   100    5500    15.44     15.45   18.62  24.00    23.21     -5.38           -4.60
   116    5580    15.52     15.65   18.76  24.00    23.22     -5.24           -4.46
   140    5700    14.51     14.66   17.76  24.00    23.22     -6.24           -5.47
   144    5720    16.42     16.57   19.67  24.00    23.22     -4.33           -3.56
   149    5745    16.53     16.61   19.74  30.00    30.00    -10.26          -10.26
   157    5785    16.79     16.88   20.01  30.00    30.00     -9.99           -9.99
   165    5825    16.91     16.87   20.06  30.00    30.00     -9.94           -9.94

                     Chain 0+1 802.11a E.I.R.P
 Channel   Frequency Total       Antenna      E.I.R.P         RSS-247    RSS-247
 No.       (MHz)     Power       Gain         (dBm)           E.I.R.P    E.I.R.P.
                     (dBm)       (dBi)                        Limit      Margin
                                                              (dBm)      (dB)
    36        5180         12.08          5.06       17.14       22.21       -5.08
    44        5220         12.25          5.06       17.30       22.21       -4.91
    48        5240         12.40          5.06       17.45       22.22       -4.76
    52        5260         19.62          5.23       24.85       29.21       -4.36
    60        5300         19.55          5.23       24.78       29.21       -4.43
    64        5320         19.35          5.23       24.58       29.22       -4.64
   100        5500         18.62          5.96       24.57       29.21       -4.64
   116        5580         18.76          5.96       24.71       29.22       -4.51
   140        5700         17.76          5.96       23.71       29.22       -5.51
   144        5720         19.67          5.96       25.62       29.22       -3.60
   149        5745         19.74          3.10       22.84         --          --
   157        5785         20.01          3.10       23.11         --          --
   165        5825         20.06          3.10       23.16         --          --




Report#: R-TR516-FCCISED-UNII-3       Issued: July 15, 2019                Page 133 of 289
                                   Microsoft EMC Laboratory


                                                                                                                        FCC ID: C3K1855
                                                                                                                       IC ID: 3048A-1855

9.6.6.2 Chain 0+1 802.11a Maximum Power Spectral Density
            UNII-1 Chain 0+1 802.11a Maximum Power Spectral Density/MHz
                                                                                                         RSS-
                                                                          Total                           247
                                        Total              Total                     15.407                                      RSS-
                    Chain    Chain                                        EIRP                           EIRP          15.407
 Chan.    Freq.                         PSD                Ant.                       Limit                                      247
                      0        1                                          PSD                            PSD           Margin
  No.     (MHz)                         π’…π‘©π’Ž                Gain                       π’…π‘©π’Ž                                       Margin
                    (dBm)    (dBm)     (          )                       π’…π‘©π’Ž        (          )        Limit          (dB)
                                           𝑴𝑯𝒛             (dBi)      (          )       𝑴𝑯𝒛             π’…π‘©π’Ž                     (dB)
                                                                          𝑴𝑯𝒛                           (         )
                                                                                                            𝑴𝑯𝒛
  36       5180     -2.25    -2.24         0.93            8.04           8.97           8.96           10.00          -8.03     -1.03
  44       5220     -2.01    -1.79         1.27            8.04           9.31           8.96           10.00          -7.69     -0.69
  48       5240     -1.78    -1.57         1.50            8.04           9.53           8.96           10.00          -7.47     -0.47

       UNII-2A and UNII-2C Chain 0+1 802.11a Maximum Power Spectral Density/MHz
                                                             Total            15.407            RSS-247                          RSS-
                             Chain      Chain                                                                         15.407
 Channel     Frequency                                       PSD               Limit             Limit                            247
                               0          1                  π’…π‘©π’Ž               π’…π‘©π’Ž               π’…π‘©π’Ž                  Margin
   No.         (MHz)                                                                                                            Margin
                             (dBm)      (dBm)               (         )       (          )          (         )        (dB)
                                                                𝑴𝑯𝒛               𝑴𝑯𝒛                   𝑴𝑯𝒛                      (dB)

    52            5260        5.33         5.23              8.45                 8.80              11.00             -0.35     -2.55
    60            5300        5.08         5.24              8.33                 8.80              11.00             -0.46     -2.67
    64            5320        4.92         5.12              8.19                 8.80              11.00             -0.61     -2.81
   100            5500        4.25         4.19              7.39                 8.06              11.00             -0.67     -3.61
   116            5580        4.33         6.65              7.67                 8.06              11.00             -0.39     -3.33
   140            5700        3.34         3.41              6.54                 8.06              11.00             -1.52     -4.46
   144            5720        4.00         4.23              7.29                 8.06              11.00             -0.78     -3.71

            UNII-3 Chain 0+1 802.11a Maximum Power Spectral Density/500kHz
                                                           Total             15.407          RSS-247                             RSS-
                                                                                                                      15.407
  Chan.     Freq.        Chain 0     Chain 1               PSD                Limit           Limit                              247
                                                                                                                      Margin
   No.      (MHz)         (dBm)       (dBm)                π’…π‘©π’Ž                π’…π‘©π’Ž             π’…π‘©π’Ž                               Margin
                                                      (             ) (                  ) (                  )       (dB)
                                                          πŸ“πŸŽπŸŽ π’Œπ‘―π’›           πŸ“πŸŽπŸŽ π’Œπ‘―π’›            πŸ“πŸŽπŸŽ π’Œπ‘―π’›                           (dB)
  149        5745         3.81        3.97                 7.06              29.89                  29.89             -22.82    -22.82
  157        5785         4.09        4.29                 7.36              29.89                  29.89             -22.52    -22.52
  165        5825         3.44        3.73                 6.76              29.89                  29.89              23.13     23.13




Report#: R-TR516-FCCISED-UNII-3            Issued: July 15, 2019                                                         Page 134 of 289
                                        Microsoft EMC Laboratory


                                                                     FCC ID: C3K1855
                                                                    IC ID: 3048A-1855




    Plot 9-183. Maximum Conducted Output Power and PSD Chain 0 802.11a (Ch. 36)




    Plot 9-184. Maximum Conducted Output Power and PSD Chain 0 802.11a (Ch. 44)




Report#: R-TR516-FCCISED-UNII-3      Issued: July 15, 2019            Page 135 of 289
                                  Microsoft EMC Laboratory



Document Created: 2019-07-22 16:51:06
Document Modified: 2019-07-22 16:51:06

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