Radio Frequency (RF) Survey

Municipal Wireless Broadband and the Digital Community Report Radio Frequency (RF) Survey for the City and County of San Francisco Appendix B RF Sp...
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Municipal Wireless Broadband and the Digital Community

Report

Radio Frequency (RF) Survey for the City and County of San Francisco

Appendix B RF Spectrum Scans

July 21, 2006

Radio Frequency (RF) Survey

Appendix B – RF Spectrum Scans The following sections include RF spectrum scans captured in the 2.4-2.5GHz and 5.0-6.0GHz frequency bands at various locations throughout the City. The spectrum scan images show the following signal values for each specific location:  Average Signal (blue line). This indicates the average signal amplitude captured at a specific location, which is a statistical average of the signals captured during the scan at that location. This is the most meaningful of the three signal values captured.  Max Hold Signal (magenta line): This indicates the maximum signal amplitudes found while the spectrum analyzer was active. As a result, the max hold signal levels may appear the same in some of the spectrum images.  Max Signal (yellow line): This indicates the maximum signal amplitudes captured at a specific location during the scan at that location.

The spectrum scans offer insight into the presence of existing radio signals that may interfere with a citywide Wi-Fi system. In locations where the average signal value is -100dBm or lower, then there is likely no significant interference. This is the case in nearly all spectrum scans performed in San Francisco. If the average signal value is higher than -100dBm, then interference may have some impact on the performance of a citywide Wi-Fi system, particularly if the max signal levels are higher than -75dBm. However, this was the case in only a few scan locations, and was confined to only a specific channel within the band, suggested minimal impact to the performance of a citywide Wi-Fi system.

Ground-Level RF Spectrum Scans The following maps and spectrum scan images correspond to the ground-level spectrum scans:

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Radio Frequency (RF) Survey

Area 1 The map below identifies the location of each spectrum image for Area 1:

The following are the spectrum images for Area 1:

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Radio Frequency (RF) Survey Location 1 (Area 1)

Location 2 (Area 1)

:

Location 3 (Area 1)

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Radio Frequency (RF) Survey Location 4 (Area 1)

Location 5 (Area 1)

: Location 6 (Area 1)

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Radio Frequency (RF) Survey Location 7 (Area 1)

Location 8 (Area 1)

:

Location 9 (Area 1)

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Radio Frequency (RF) Survey Location 10 (Area 1)

Location 11 (Area 1)

:

Location 12 (Area 1)

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Radio Frequency (RF) Survey Location 13 (Area 1)

Location 14 (Area 1)

:

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Radio Frequency (RF) Survey Area 2 The map below identifies the location of each spectrum image for Area 2:

The following are the spectrum image for Area 2:

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Radio Frequency (RF) Survey Location 1 (Area 2)

Location 2 (Area 2)

:

Location 3 (Area 2)

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Radio Frequency (RF) Survey Location 4 (Area 2)

Location 5 (Area 2)

:

Location 6 (Area 2)

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Radio Frequency (RF) Survey Location 7 (Area 2)

Location 8 (Area 2)

:

Location 9 (Area 2)

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Radio Frequency (RF) Survey Location 10 (Area 2)

Location 11 (Area 2)

:

Location 12 (Area 2)

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Radio Frequency (RF) Survey Location 13 (Area 2)

Location 14 (Area 2)

:

Location 15 (Area 2)

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Radio Frequency (RF) Survey Location 16 (Area 2)

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Radio Frequency (RF) Survey Area 3 The map below identifies the location of each spectrum image for Area 3:

The following are the spectrum images for Area 3:

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Radio Frequency (RF) Survey Location 1 (Area 3)

Location 2 (Area 3)

:

Location 3 (Area 3)

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Radio Frequency (RF) Survey Location 4 (Area 3)

Location 5 (Area 3)

:

Location 6 (Area 3)

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Radio Frequency (RF) Survey Location 7 (Area 3)

Location 8 (Area 3)

:

Location 9 (Area 3)

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Radio Frequency (RF) Survey Location 10 (Area 3)

Location 11 (Area 3)

:

Location 12 (Area 3)

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Radio Frequency (RF) Survey Location 13 (Area 3)

Location 14 (Area 3)

:

Location 15 (Area 3)

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Radio Frequency (RF) Survey Location 16 (Area 3)

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Radio Frequency (RF) Survey Area 4 The map below identifies the location of each spectrum image for Area 4:

The following are the spectrum images for Area 4:

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Radio Frequency (RF) Survey Location 1 (Area 4)

Location 2 (Area 4)

:

Location 3 (Area 4)

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Radio Frequency (RF) Survey Location 4 (Area 4)

Location 5 (Area 4)

:

Location 6 (Area 4)

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Radio Frequency (RF) Survey Location 7 (Area 4)

Location 8 (Area 4)

:

Location 9 (Area 4)

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Radio Frequency (RF) Survey Location 10 (Area 4)

Location 11 (Area 4)

:

Location 12 (Area 4)

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Radio Frequency (RF) Survey Location 13 (Area 4)

Location 14 (Area 4)

:

Location 15 (Area 4)

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Radio Frequency (RF) Survey Location 16 (Area 4)

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Radio Frequency (RF) Survey Area 5 The map below identifies the location of each spectrum image for Area 5:

The following are the spectrum images for Area 5:

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Radio Frequency (RF) Survey Location 1 (Area 5)

Location 2 (Area 5)

:

Location 3 (Area 5)

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Radio Frequency (RF) Survey Location 4 (Area 5)

Location 5 (Area 5)

:

Location 6 (Area 5)

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Radio Frequency (RF) Survey Location 7 (Area 5)

Location 8 (Area 5)

:

Location 9 (Area 5)

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Radio Frequency (RF) Survey Location 10 (Area 5)

Location 11 (Area 5)

:

Location 12 (Area 5)

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Radio Frequency (RF) Survey Location 13 (Area 5)

Location 14 (Area 5)

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Location 15 (Area 5)

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Radio Frequency (RF) Survey Location 16 (Area 5)

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Radio Frequency (RF) Survey Area 6 The map below identifies the location of each spectrum image for Area 6:

The following are the spectrum images for Area 6:

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Radio Frequency (RF) Survey Location 1 (Area 6)

Location 2 (Area 6)

:

Location 3 (Area 6)

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Radio Frequency (RF) Survey Location 4 (Area 6)

Location 5 (Area 6)

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Location 6 (Area 6)

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Radio Frequency (RF) Survey Location 7 (Area 6)

Location 8 (Area 6)

:

Location 9 (Area 6)

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Radio Frequency (RF) Survey Location 10 (Area 6)

Location 11 (Area 6)

:

Location 12 (Area 6)

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Radio Frequency (RF) Survey Location 13 (Area 6)

Location 14 (Area 6)

:

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Radio Frequency (RF) Survey

Rooftop RF Spectrum Scans Spectrum scans were performed on several rooftops, which are sample locations where it’s possible for the City to install backhaul antennas and equipment. This provides an assessment of potential signals that may impact the operation of a backhaul network supporting a city-wide Wi-Fi network. The map in Figure B-2 identifies the location of each rooftop spectrum scan.

Location 1: Central Radio Station

Location 3: One Market Plaza

Location 2: Clay and Jones Building

Location 4: Bernal Heights

Figure B-2. Rooftop Spectrum Scan Locations.

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Radio Frequency (RF) Survey Table B-1 describes the results of the spectrum scans at the rooftop locations. Test Location

Coordinates

Location1

N 37o 45.279’

Central Radio Station

W 122o 26.798’

Comments 2.4-2.5GHz: -80dBm signal levels throughout the band on all sides of the building rooftop, except -70dBm signals on channels 1 and 6. 5.0-6.0GHz: -90dBm signal levels throughout the band on all sides of the building rooftop, except -80dBm to 70dBm signals at 5.8GHz.

Location 2

N 37o 47.589’

Clay and Jones Building

W 122o 24.849’

-

2.4-2.5GHz: -70dBm signal levels throughout the band on all sides of the building rooftop, except the northwest side of the building has signals levels at -80dBm across the band. 5.0-6.0GHz: -90dBm signal levels throughout the band on all sides of the building rooftop, except -70dBm to 60dBm signals at 5.8GHz.

Location 3

N 37o 47.602’

One Market Plaza

W 122o 23.661’

2.4-2.5GHz: -75dBm signal levels throughout the band on all sides of the building rooftop, except the west side of the building, which has signals levels at -50dBm to -60dBm across the entire band. 5.0-6.0GHz: -90dBm signal levels throughout the band on all sides of the building rooftop, except -70dBm to 65dBm signals at 5.8GHz.

Location 4

N 37o 44.585’

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-

2.4-2.5GHz: -80dBm signal levels throughout the band on all sides of the

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Radio Frequency (RF) Survey

Bernal Heights

W 122o 24.900’

building rooftop. 5.0-6.0GHz: -90dBm signal levels throughout the band on all sides of the building rooftop, except -70dBm to 65dBm signals at 5.2 and 5.8GHz.

Table B-2. Rooftop RF Spectrum Scan Data

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