Test report

FCC ID: SBVRM002

Test Report

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FCCID_1217374

Sonos Inc. Report No. 09PRO022
FCC ID: SBVRM002
Model: WMP-N06

15.205 Restricted Frequency Bands

MHz MHz MHz GHz
0.090 - 0.110 16.42 - 16.423 399.9 - 410 4.5 - 5.15
0.495 - 0.505 (1) 16.69475 - 16.69525 608 - 614 5.35 - 5.46
2.1735 - 2.1905 16.80425 - 16.80475 960 - 1240 7.25 - 7.75
4.125 - 4.128 25.5 - 25.67 1300 - 1427 8.025 - 8.5
4.17725 - 4.17775 37.5 - 38.25 1435 - 1626.5 9.0 - 9.2
4.20725 - 4.20775 73 - 74.6 1645.5 - 1646.5 9.3 - 9.5
6.215 - 6.218 74.8 - 75.2 1660 - 1710 10.6 - 12.7
6.26775 - 6.26825 108 - 121.94 1718.8 - 1722.2 13.25 - 13.4
6.31175 - 6.31225 123 - 138 2200 - 2300 14.47 - 14.5
8.291 - 8.294 149.9 - 150.05 2310 - 2390 15.35 - 16.2
8.362 - 8.366 156.52475 - 2483.5 - 2500 17.7 - 21.4
8.37625 - 8.38675 156.52525 2655 - 2900 22.01 - 23.12
8.41425 - 8.41475 156.7 - 156.9 3260 - 3267 23.6 - 24.0
12.29 - 12.293 162.0125 - 167.17 3332 - 3339 31.2 - 31.8
12.51975 - 12.52025 167.72 - 173.2 3345.8 - 3358 36.43 - 36.5
12.57675 - 12.57725 240 - 285 3600 - 4400
13.36 - 13.41 322 - 335.4

15.209 Gen eral Field Strength Limits

Frequency Field Strength Measurement Distance
(MHz) (microvolts/meter) (meters)
_______________________________________________________________
0.009 - 0.490 2400/F (kHz) 300
0.490 - 1.705 24000/F (kHz) 30
1.705 - 30.0 30 30
30 - 88 100 ** 3
88 - 216 150 ** 3
216 - 960 200 ** 3
Above 960 500 3
_______________________________________________________________

Page 5of 29

Sonos Inc. Report No. 09PRO022
FCC ID: SBVRM002
Model: WMP-N06

Peak RF Output Power Measurements

Peak Power and Average Power Test Results Summary
(average power readings for reference only)

FCC ID: SBVRM002
C2PC Power Settings
P meter P meter P meter
Channel Mode Pset dBm ChB dBm ChA dBm ChC dBm Pout Tot dBm
Ave Power
1 802.11g 15 14.1 13.9 13.3 18.6
6 802.11g 19 18.31 17.7 18 22.8
11 802.11g 15 14.34 13.9 14 18.9

1 HT20 15 14.27 13.8 13.3 18.6
6 HT20 19 18.38 17.8 18 22.8
11 HT20 15 14.3 13.8 13.9 18.8

Peak Power
1 802.11g 15 19.9 19.5 19.3 24.3
6 802.11g 19 24.33 23.86 23.82 28.78
11 802.11g 15 19.97 19.9 19.6 24.6

1 HT20 15 19.99 19.79 19.52 24.5
6 HT20 19 24.47 23.88 23.98 28.89
11 HT20 15 20.21 19.99 20.02 24.8

Page 6of 29

Sonos Inc. Report No. 09PRO022
FCC ID: SBVRM002
Model: WMP-N06

Radiated Emissions
Wembley 802.11g and HT20 modes
High Frequency Measurement
Compliance Certification Services, Fremont 5m Chamber

Test Engr: Tom Chen
Date: 10/17/08
Project #:
Company: Sonos
EUT Description: 802.11g/HT20 radio module
EUT M/N: RM002 module with Wembley antennas
Test Target:
Mode Oper: Continuous TX
f Measurement Frequency Amp Preamp Gain Average Field Strength Limit
Dist Distance to Antenna D Corr Distance Correct to 3 meters Peak Field Strength Limit
Read Analyzer Reading Avg Average Field Strength @ 3 m Margin vs. Average Limit
AF Antenna Factor Peak Calculated Peak Field Strength Margin vs. Peak Limit
CL Cable Loss HPF High Pass Filter

f Dist Read AF CL Amp D Corr Fltr Corr. Limit Margin Ant. Pol. Det. Ant.High Table Angle Notes
GHz (m) dBuV dB/m dB dB dB dB dBuV/m dBuV/m dB V/H P/A/QP cm Degree
2412 MHz Low CH
4.824 3.0 39.0 33.1 5.9 -36.5 0.0 0.0 41.5 74.0 -32.5 V P 197.4 261.6 Power set 15 dBm, g mode
4.824 3.0 26.5 33.1 5.9 -36.5 0.0 0.0 29.1 54.0 -24.9 V A 197.4 261.6 Power set 15 dBm, g mode
7.236 3.0 37.6 35.4 7.3 -36.2 0.0 0.0 44.1 74.0 -29.9 V P 197.4 261.6 Power set 15 dBm, g mode
7.236 3.0 25.4 35.4 7.3 -36.2 0.0 0.0 31.9 54.0 -22.1 V A 197.4 261.6 Power set 15 dBm, g mode
2437 MHz Mid CH
4.874 3.0 39.4 33.1 5.8 -36.5 0.0 0.0 41.8 74.0 -32.2 V P 174.0 277.9 Power set 19 dBm, g mode
4.874 3.0 26.5 33.1 5.8 -36.5 0.0 0.0 29.0 54.0 -25.0 V A 174.0 277.9 Power set 19 dBm, g mode
7.311 3.0 38.8 35.3 7.3 -36.2 0.0 0.0 45.2 74.0 -28.8 V P 174.0 277.9 Power set 19 dBm, g mode
7.311 3.0 26.2 35.3 7.3 -36.2 0.0 0.0 32.6 54.0 -21.4 V A 174.0 277.9 Power set 19 dBm, g mode
2462 MHz High CH
4.924 3.0 39.0 33.1 5.9 -36.5 0.0 0.0 41.5 74.0 -32.5 V P 155.1 322.8 Power set 15 dBm, g mode
4.924 3.0 26.5 33.1 5.9 -36.5 0.0 0.0 29.0 54.0 -25.0 V A 155.1 322.8 Power set 15 dBm, g mode
7.386 3.0 38.8 35.4 7.3 -36.2 0.0 0.0 45.3 74.0 -28.7 V P 155.1 322.8 Power set 15 dBm, g mode
7.386 3.0 25.7 35.4 7.3 -36.2 0.0 0.0 32.2 54.0 -21.8 V A 155.1 322.8 Power set 15 dBm, g mode
2412 MHz Low CH
4.824 3.0 39.2 33.0 5.8 -36.5 0.0 0.0 41.5 74.0 -32.5 V P 191.9 124.4 Power set 15 dBm, HT20
4.824 3.0 26.6 33.0 5.8 -36.5 0.0 0.0 28.9 54.0 -25.1 V A 191.9 124.4 Power set 15 dBm, HT20
7.236 3.0 37.1 35.2 7.2 -36.2 0.0 0.0 43.3 74.0 -30.7 V P 191.9 124.4 Power set 15 dBm, HT20
7.236 3.0 25.2 35.2 7.2 -36.2 0.0 0.0 31.4 54.0 -22.6 V A 191.9 124.4 Power set 15 dBm, HT20
2437 MHz Mid CH
4.874 3.0 39.0 33.1 5.8 -36.5 0.0 0.0 41.5 74.0 -32.5 V P 140.3 262.0 Power set 19 dBm, HT20
4.874 3.0 26.0 33.1 5.8 -36.5 0.0 0.0 28.4 54.0 -25.6 V A 140.3 262.0 Power set 19 dBm, HT20
7.311 3.0 39.6 35.3 7.3 -36.2 0.0 0.0 45.9 74.0 -28.1 V P 140.3 262.0 Power set 19 dBm, HT20
7.311 3.0 26.6 35.3 7.3 -36.2 0.0 0.0 32.9 54.0 -21.1 V A 140.3 262.0 Power set 19 dBm, HT20
2462 MHz High CH
4.924 3.0 38.3 33.1 5.9 -36.5 0.0 0.0 40.8 74.0 -33.2 V P 102.1 311.6 Power set 15 dBm, HT20
4.924 3.0 26.3 33.1 5.9 -36.5 0.0 0.0 28.9 54.0 -25.1 V A 102.1 311.6 Power set 15 dBm, HT20
7.386 3.0 37.6 35.4 7.3 -36.2 0.0 0.0 44.1 74.0 -29.9 V P 102.1 311.6 Power set 15 dBm, HT20
7.386 3.0 25.3 35.4 7.3 -36.2 0.0 0.0 31.8 54.0 -22.2 V A 102.1 311.6 Power set 15 dBm, HT20
Rev. 4.1.2.7
Note: No other emissions were detected above the system noise floor.

Page 21of 29

Sonos Inc. Report No. 09PRO022
FCC ID: SBVRM002
Model: WMP-N06

Radiated Emissions
Avalon 802.11g mode
High Frequency Measurement
Compliance Certification Services, Fremont 5m Chamber

Test Engr: Tom Chen
Date: 10/08/09
Project #: 09U12867
Company: Sonos Inc.
EUT Description: 802.11g/HT20 module
EUT M/N: RM002 module with Avalon Antennas
Test Target:
Mode Oper: Continuous transmission - 802.11g
f Measurement Frequency Amp Preamp Gain Average Field Strength Limit
Dist Distance to Antenna D Corr Distance Correct to 3 meters Peak Field Strength Limit
Read Analyzer Reading Avg Average Field Strength @ 3 m Margin vs. Average Limit
AF Antenna Factor Peak Calculated Peak Field Strength Margin vs. Peak Limit
CL Cable Loss HPF High Pass Filter

f Dist Read AF CL Amp D Corr Fltr Corr. Limit Margin Ant. Pol. Det. Ant.High Table Angle Notes
GHz (m) dBuV dB/m dB dB dB dB dBuV/m dBuV/m dB V/H P/A/QP cm Degree
2412 MHz Low CH
4.824 3.0 38.6 33.0 5.8 -36.5 0.0 0.0 41.0 74.0 -33.0 V P 123.9 6.5 Power set 15 dBm, g mode
4.824 3.0 26.6 33.0 5.8 -36.5 0.0 0.0 29.0 54.0 -25.0 V A 123.9 6.5 Power set 15 dBm, g mode
2412 MHz Low CH
7.236 3.0 37.4 35.2 7.2 -36.2 0.0 0.0 43.6 74.0 -30.4 V P 123.9 6.5 Power set 15 dBm, g mode
7.236 3.0 25.3 35.2 7.2 -36.2 0.0 0.0 31.5 54.0 -22.5 V A 123.9 6.5 Power set 15 dBm, g mode
2412 MHz Low CH
9.648 3.0 36.8 37.4 8.5 -37.0 0.0 0.0 45.8 74.0 -28.2 V P 123.9 6.5 Power set 15 dBm, g mode
9.648 3.0 24.8 37.4 8.5 -37.0 0.0 0.0 33.8 54.0 -20.2 V A 123.9 6.5 Power set 15 dBm, g mode
2412 MHz Low CH
4.824 3.0 39.1 33.0 5.8 -36.5 0.0 0.0 41.4 74.0 -32.6 H P 169.4 340.0 Power set 15 dBm, g mode
4.824 3.0 26.6 33.0 5.8 -36.5 0.0 0.0 28.9 54.0 -25.1 H A 169.4 340.0 Power set 15 dBm, g mode
2412 MHz Low CH
7.236 3.0 38.0 35.2 7.2 -36.2 0.0 0.0 44.2 74.0 -29.8 H P 169.4 340.0 Power set 15 dBm, g mode
7.236 3.0 25.2 35.2 7.2 -36.2 0.0 0.0 31.4 54.0 -22.6 H A 169.4 340.0 Power set 15 dBm, g mode
2412 MHz Low CH
9.648 3.0 37.0 37.4 8.5 -37.0 0.0 0.0 46.0 74.0 -28.0 H P 169.4 340.0 Power set 15 dBm, g mode
9.648 3.0 24.7 37.4 8.5 -37.0 0.0 0.0 33.7 54.0 -20.3 H A 169.4 340.0 Power set 15 dBm, g mode
2437 MHz Mid CH
4.874 3.0 38.9 33.1 5.8 -36.5 0.0 0.0 41.4 74.0 -32.6 H P 177.1 234.0 Power set 19 dBm, g mode
4.874 3.0 26.2 33.1 5.8 -36.5 0.0 0.0 28.6 54.0 -25.4 H A 177.1 234.0 Power set 19 dBm, g mode
2437 MHz Mid CH
7.311 3.0 39.0 35.3 7.3 -36.2 0.0 0.0 45.4 74.0 -28.6 H P 177.1 234.0 Power set 19 dBm, g mode
7.311 3.0 26.3 35.3 7.3 -36.2 0.0 0.0 32.6 54.0 -21.4 H A 177.1 234.0 Power set 19 dBm, g mode
2437 MHz Mid CH
9.748 3.0 37.5 37.4 8.6 -37.0 0.0 0.0 46.5 74.0 -27.5 H P 177.1 234.0 Power set 19 dBm, g mode
9.748 3.0 25.0 37.4 8.6 -37.0 0.0 0.0 34.0 54.0 -20.0 H A 177.1 234.0 Power set 19 dBm, g mode
2437 MHz Mid CH
4.874 3.0 38.8 33.1 5.8 -36.5 0.0 0.0 41.2 74.0 -32.8 V P 174.9 116.0 Power set 19 dBm, g mode
4.874 3.0 26.5 33.1 5.8 -36.5 0.0 0.0 29.0 54.0 -25.0 V A 174.9 116.0 Power set 19 dBm, g mode
2437 MHz Mid CH
7.311 3.0 41.7 35.3 7.3 -36.2 0.0 0.0 48.0 74.0 -26.0 V P 174.9 116.0 Power set 19 dBm, g mode
7.311 3.0 27.6 35.3 7.3 -36.2 0.0 0.0 33.9 54.0 -20.1 V A 174.9 116.0 Power set 19 dBm, g mode
2437 MHz Mid CH
9.748 3.0 38.3 37.4 8.6 -37.0 0.0 0.0 47.4 74.0 -26.6 V P 174.9 116.0 Power set 19 dBm, g mode
9.748 3.0 25.9 37.4 8.6 -37.0 0.0 0.0 34.9 54.0 -19.1 V A 174.9 116.0 Power set 19 dBm, g mode
2462 MHz High CH
4.924 3.0 40.0 33.1 5.9 -36.5 0.0 0.0 42.6 74.0 -31.4 V P 176.2 19.5 Power set 15 dBm, g mode
4.924 3.0 26.3 33.1 5.9 -36.5 0.0 0.0 28.9 54.0 -25.1 V A 176.2 19.5 Power set 15 dBm, g mode
2462 MHz High CH
7.386 3.0 40.8 35.4 7.3 -36.2 0.0 0.0 47.3 74.0 -26.7 V P 176.2 19.5 Power set 15 dBm, g mode
7.386 3.0 26.5 35.4 7.3 -36.2 0.0 0.0 33.0 54.0 -21.0 V A 176.2 19.5 Power set 15 dBm, g mode
2462 MHz High CH
9.848 3.0 36.7 37.5 8.7 -37.0 0.0 0.0 45.8 74.0 -28.2 V P 176.2 19.5 Power set 15 dBm, g mode
9.848 3.0 24.7 37.5 8.7 -37.0 0.0 0.0 33.8 54.0 -20.2 V A 176.2 19.5 Power set 15 dBm, g mode
2462 MHz High CH
4.924 3.0 38.8 33.1 5.9 -36.5 0.0 0.0 41.4 74.0 -32.6 H P 135.9 267.2 Power set 15 dBm, g mode
4.924 3.0 26.3 33.1 5.9 -36.5 0.0 0.0 28.9 54.0 -25.1 H A 135.9 267.2 Power set 15 dBm, g mode
2462 MHz High CH
7.386 3.0 37.7 35.4 7.3 -36.2 0.0 0.0 44.2 74.0 -29.8 H P 135.9 267.2 Power set 15 dBm, g mode
7.386 3.0 25.2 35.4 7.3 -36.2 0.0 0.0 31.7 54.0 -22.3 H A 135.9 267.2 Power set 15 dBm, g mode
2462 MHz High CH
9.848 3.0 37.5 37.5 8.7 -37.0 0.0 0.0 46.5 74.0 -27.5 H P 135.9 267.2 Power set 15 dBm, g mode
9.848 3.0 24.7 37.5 8.7 -37.0 0.0 0.0 33.8 54.0 -20.2 H A 135.9 267.2 Power set 15 dBm, g mode
Rev. 4.1.2.7
Note: No other emissions were detected above the system noise floor.

Page 22of 29

Sonos Inc. Report No. 09PRO022
FCC ID: SBVRM002
Model: WMP-N06

Radiated Emissions
Avalon HT20 mode
High Frequency Measurement
Compliance Certification Services, Fremont 5m Chamber

Test Engr: Tom Chen
Date: 10/07/08
Project #:
Company: Sonos
EUT Description: 802.11g/HT20 radio module
EUT M/N: RM002 with Avalon antennas
Test Target:
Mode Oper: Continuous transmission - HT20 mode
f Measurement Frequency Amp Preamp Gain Average Field Strength Limit
Dist Distance to Antenna D Corr Distance Correct to 3 meters Peak Field Strength Limit
Read Analyzer Reading Avg Average Field Strength @ 3 m Margin vs. Average Limit
AF Antenna Factor Peak Calculated Peak Field Strength Margin vs. Peak Limit
CL Cable Loss HPF High Pass Filter

f Dist Read AF CL Amp D Corr Fltr Corr. Limit Margin Ant. Pol. Det. Ant.High Table Angle Notes
GHz (m) dBuV dB/m dB dB dB dB dBuV/m dBuV/m dB V/H P/A/QP cm Degree
2412 MHz Low CH
4.824 3.0 39.1 33.0 5.8 -36.5 0.0 0.0 41.5 74.0 -32.5 H P 182.5 61.7 Power set 15 dBm, HT20
4.824 3.0 26.4 33.0 5.8 -36.5 0.0 0.0 28.8 54.0 -25.2 H A 182.5 61.7 Power set 15 dBm, HT20
2412 MHz Low CH
7.236 3.0 37.9 35.2 7.2 -36.2 0.0 0.0 44.1 74.0 -29.9 H P 182.5 61.7 Power set 15 dBm, HT20
7.236 3.0 25.2 35.2 7.2 -36.2 0.0 0.0 31.4 54.0 -22.6 H A 182.5 61.7 Power set 15 dBm, HT20
2412 MHz Low CH
9.648 3.0 37.0 37.4 8.5 -37.0 0.0 0.0 46.0 74.0 -28.0 H P 182.5 61.7 Power set 15 dBm, HT20
9.648 3.0 24.5 37.4 8.5 -37.0 0.0 0.0 33.5 54.0 -20.5 H A 182.5 61.7 Power set 15 dBm, HT20
2412 MHz Low CH
4.824 3.0 39.1 33.0 5.8 -36.5 0.0 0.0 41.5 74.0 -32.5 V P 119.3 182.4 Power set 15 dBm, HT20
4.824 3.0 26.4 33.0 5.8 -36.5 0.0 0.0 28.8 54.0 -25.2 V A 119.3 182.4 Power set 15 dBm, HT20
2412 MHz Low CH
7.236 3.0 37.9 35.2 7.2 -36.2 0.0 0.0 44.1 74.0 -29.9 V P 119.3 182.4 Power set 15 dBm, HT20
7.236 3.0 25.2 35.2 7.2 -36.2 0.0 0.0 31.4 54.0 -22.6 V A 119.3 182.4 Power set 15 dBm, HT20
2412 MHz Low CH
9.648 3.0 37.2 37.4 8.5 -37.0 0.0 0.0 46.2 74.0 -27.8 V P 119.3 182.4 Power set 15 dBm, HT20
9.648 3.0 24.7 37.4 8.5 -37.0 0.0 0.0 33.7 54.0 -20.3 V A 119.3 182.4 Power set 15 dBm, HT20
2437 MHz Mid CH
4.874 3.0 39.3 33.1 5.8 -36.5 0.0 0.0 41.8 74.0 -32.2 V P 171.7 151.4 Power set 19 dBm, HT20
4.874 3.0 26.2 33.1 5.8 -36.5 0.0 0.0 28.6 54.0 -25.4 V A 171.7 151.4 Power set 19 dBm, HT20
2437 MHz Mid CH
7.311 3.0 38.9 35.3 7.3 -36.2 0.0 0.0 45.3 74.0 -28.7 V P 171.7 151.4 Power set 19 dBm, HT20
7.311 3.0 26.0 35.3 7.3 -36.2 0.0 0.0 32.4 54.0 -21.6 V A 171.7 151.4 Power set 19 dBm, HT20
2437 MHz Mid CH
9.748 3.0 37.6 37.4 8.6 -37.0 0.0 0.0 46.6 74.0 -27.4 V P 171.7 151.4 Power set 19 dBm, HT20
9.748 3.0 25.1 37.4 8.6 -37.0 0.0 0.0 34.1 54.0 -19.9 V A 171.7 151.4 Power set 19 dBm, HT20
2437 MHz Mid CH
4.874 3.0 38.2 33.1 5.8 -36.5 0.0 0.0 40.7 74.0 -33.3 H P 199.6 9.8 Power set 19 dBm, HT20
4.874 3.0 25.9 33.1 5.8 -36.5 0.0 0.0 28.3 54.0 -25.7 H A 199.6 9.8 Power set 19 dBm, HT20
2437 MHz Mid CH
7.311 3.0 37.9 35.3 7.3 -36.2 0.0 0.0 44.2 74.0 -29.8 H P 199.6 9.8 Power set 19 dBm, HT20
7.311 3.0 25.5 35.3 7.3 -36.2 0.0 0.0 31.9 54.0 -22.1 H A 199.6 9.8 Power set 19 dBm, HT20
2437 MHz Mid CH
9.748 3.0 37.0 37.4 8.6 -37.0 0.0 0.0 46.0 74.0 -28.0 H P 199.6 9.8 Power set 19 dBm, HT20
9.748 3.0 24.4 37.4 8.6 -37.0 0.0 0.0 33.5 54.0 -20.5 H A 199.6 9.8 Power set 19 dBm, HT20
2462 MHz High CH
4.924 3.0 38.6 33.1 5.9 -36.5 0.0 0.0 41.1 74.0 -32.9 H P 152.6 0.0 Power set 15 dBm, HT20
4.924 3.0 26.3 33.1 5.9 -36.5 0.0 0.0 28.9 54.0 -25.1 H A 152.6 0.0 Power set 15 dBm, HT20
2462 MHz High CH
7.386 3.0 37.5 35.4 7.3 -36.2 0.0 0.0 44.0 74.0 -30.0 H P 152.6 0.0 Power set 15 dBm, HT20
7.386 3.0 25.2 35.4 7.3 -36.2 0.0 0.0 31.7 54.0 -22.3 H A 152.6 0.0 Power set 15 dBm, HT20
2462 MHz High CH
9.848 3.0 36.6 37.5 8.7 -37.0 0.0 0.0 45.7 74.0 -28.3 H P 152.6 0.0 Power set 15 dBm, HT20
9.848 3.0 24.6 37.5 8.7 -37.0 0.0 0.0 33.7 54.0 -20.3 H A 152.6 0.0 Power set 15 dBm, HT20
2462 MHz High CH
4.924 3.0 38.5 33.1 5.9 -36.5 0.0 0.0 41.1 74.0 -32.9 V P 134.5 328.1 Power set 15 dBm, HT20
4.924 3.0 26.3 33.1 5.9 -36.5 0.0 0.0 28.9 54.0 -25.1 V A 134.5 328.1 Power set 15 dBm, HT20
2462 MHz High CH
7.386 3.0 38.2 35.4 7.3 -36.2 0.0 0.0 44.7 74.0 -29.3 V P 134.5 328.1 Power set 15 dBm, HT20
7.386 3.0 25.2 35.4 7.3 -36.2 0.0 0.0 31.7 54.0 -22.3 V A 134.5 328.1 Power set 15 dBm, HT20
2462 MHz High CH
9.848 3.0 37.6 37.5 8.7 -37.0 0.0 0.0 46.7 74.0 -27.3 V P 134.5 328.1 Power set 15 dBm, HT20
9.848 3.0 24.6 37.5 8.7 -37.0 0.0 0.0 33.7 54.0 -20.3 V A 134.5 328.1 Power set 15 dBm, HT20
0.0
0.0
0.0
0.0
Rev. 4.1.2.7
Note: No other emissions were detected above the system noise floor.

Page 23of 29

Sonos Inc. Report No. 09PRO022
FCC ID: SBVRM002
Model: WMP-N06

CALCULATIONS

Given
E = (30 * P * G) / d
and
S = E ^ 2 / 3770
where
E = Field Strength in Volts/meter
P = Power in Watts
G = Numeric antenna gain
d = Distance in meters
S = Power Density in milliwatts/square centimeter

Combining equations and rearranging the terms to express the distance as a function of
the remaining variables yields:
d = ((30 * P * G) / (3770 * S))

Changing to units of Power to mW and Distance to cm, using:
P (mW) = P (W) / 1000 and
d (cm) =100 * d (m)
yields
d = 100 * ((30 * (P / 1000) * G) / (3770 * S))
d = 0.282 * (P * G / S)
where
d = distance in cm
P = Power in mW
G = Numeric antenna gain
S = Power Density in mW/cm^2

Substituting the logarithmic form of power and gain using:
P (mW) = 10 ^ (P (dBm) / 10) and
G (numeric) = 10 ^ (G (dBi) / 10)
yields
d = 0.282 * 10 ^ ((P + G) / 20) / S Equation (1)
where
d = MPE distance in cm
P = Power in dBm
G = Antenna Gain in dBi
S = Power Density Limit in mW/cm^2

Equation (1) and the measured peak power is used to calculate the MPE distance.

Page 25of 29

Sonos Inc. Report No. 09PRO022
FCC ID: SBVRM002
Model: WMP-N06

LIMITS

From §1.1310 Table 1 (B), S = 1.0 mW/cm^2

RESULTS

No non-compliance noted:

WEMBLEY ANTENNA MPE CALCULATIONS

Legacy 802.11g Mode
Power Density Output Antenna S, mW/cm2 MPE
Limit Power Gain at 20cm Distance
(mW/cm^2) (dBm) (dBi) (cm)
1.0 28.80 5.88 0.62 15.86

HT20 MIMO Mode
Power Density Output Antenna S, mW/cm2 MPE
Limit Power Gain at 20cm Distance
(mW/cm^2) (dBm) (dBi) (cm)
1.0 28.89 1.99 0.24 9.87

Antenna gains: 0.46 dBi, 1.99 dBi, and 0.79 dBi
Maximum Antenna gain, legacy mode = 10log(10 0.46/10 +10 1.99/10+10 0.79/10) = 5.88 dBi

NOTE: For mobile or fixed location transmitters, the minimum separation distance is 20
cm, even if calculations indicate that the MPE distance would be less.

Page 26of 29

Sonos Inc. Report No. 09PRO022
FCC ID: SBVRM002
Model: WMP-N06
AVALON ANTENNA MPE CALCULATIONS

Legacy 802.11g Mode
Power Density Output Antenna S, mW/cm2 MPE
Limit Power Gain at 20cm Distance
(mW/cm^2) (dBm) (dBi) (cm)
1.0 28.80 6.2 0.63 15.86

HT20 MIMO Mode
Power Density Output Antenna S, mW/cm2 MPE
Limit Power Gain at 20cm Distance
(mW/cm^2) (dBm) (dBi) (cm)
1.0 28.89 1.50 0.24 9.27

Antenna gains: 1.0 dBi, 2.26 dBi, and 0.79 dBi
Maximum Antenna gain, legacy mode = 10log(10 1.0/10 +10 2.26/10+10 0.79/10) = 6.2 dBi

NOTE: For mobile or fixed location transmitters, the minimum separation distance is 20
cm, even if calculations indicate that the MPE distance would be less.

Page 27of 29

Document Created: 2009-12-06 11:32:34
Document Modified: 2009-12-06 11:32:34

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