mobile phone base-station audit · 1868.4 7.04e-12 9.342 7.54e-13 1850.2 6.45e-12 9.251 6.97e-13...

Audit site: Bolton Community CollegeManchester Road

Bolton LancashireBL2 1ER

(no photo)

Mobile PhoneBase-Station Audit

The Office of Communications (Ofcom) is responsible for management of the civil radio spectrum in the UK. Following recommendations of the Stewart Report in 2000 Ofcom is continuing a national measurement programme to ensure that emissions from cellular base stations do not exceed the guidelines for public maximum exposure set by the International Commission on Non-Ionizing Radiation Protection (ICNIRP).

Electric field strength measurements made in various bands are referenced to andpresented alongside the relevant ICNIRP public maximum exposure levels. On theleft hand side of the results page(s) is a graphical representation of the radiospectrum surveyed at each location on the site. The green line on each graphindicates the ICNIRP guideline exposure level for that frequency band. To the righthand side of each graph is a table showing the ten highest level emissions recordedwithin a band.

Further explanation of the results and their context within the ICNIRP guidelines can be provided by the Ofcom officers at the time of the audit or by contacting Ofcom on 020 7981 3040 or by e-mail at [email protected] A glossary of terms can be found at the end of the report.

Results taken from all audit sites and further information on the audit programme can be found on the Ofcom website at www.ofcom.org.uk

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Summary of results:

Location Total band exposure Relationship to ICNIRP LimitSlip road down to St Peters Way 1.09E-08 1/ 92135915

Traffic lights & foot crossing, Braford St 1.06E-08 1/ 94488272Car park rear of St Peters Court 1.05E-08 1/ 95652053

Access to Back Hilden Street 2.32E-09 1/ 431729051Selwyn Street facing St Peters Way 6.99E-10 1/ 1430797885

Issued on behalf of Ofcom.

Issued by: Received by:

JL and DT Peter Lewis FairchildField Engineer Resident

The following table, sorted in descending order of signal level, summarises the results obtained at each measurement location.

Report Summary

As the radio spectrum is continually changing, these measurements can only provide information on the radio frequency (RF) conditions for the specific locations at the time of the survey.

Ofcom performed this survey of the RF emission environment prevailing in the vicinity of Bolton Community College on 20/05/2008

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2.

3.

Survey equipment

The measurements were performed using:

*

*

Receiver:Manufacturer: Rohde & SchwarzModel: FSH6Serial Number: 100584

Probe:Manufacturer: Rohde & SchwarzModel: TS-EMFSerial Number: 100044

a carefully calibrated exposure level meter for all cellular frequencies to ensure that that the measurements are meaningful and accurate.

an isotropic field probe, which reacts to all polarisations (directions) of the electric field, in a similar way to biological tissue.

Survey Methodology

EM power density levels have been measured in this survey using a carefully designedand controlled methodology. Elements of this methodology include:

A peak search around the identified location in order to determine with accuracy the spot where the maximum radiation levels are being received. To achieve this, the survey engineer walked in the area surrounding the site along a pre-defined template path, using the hand-held probe and noted the location of maximum reading.The probe was then positioned on a tripod at the exact location of the maximum radiation level readings and the measurement taken. The height of the probe is approximately 1.5m above the ground.The exact measurement position was recorded using a GPS receiver and photographs of the location were taken where appropriate.

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Site: Bolton Community CollegeLocation: Car park rear of St Peters CourtTotal Band Exposure Quotient: 1.04546E-08Total Number of Measurements: 4NGR: SD 7238 0882Start time: 20/05/2008 11:03Officer: JL and DT

Frequency (MHz)

Power Density (W/m2)

ICNIRP Maximum (W/m2)

Exposure Quotient

948 2.85E-08 4.74 6.01E-09948.2 9.64E-09 4.741 2.03E-09937.2 2.82E-09 4.686 6.02E-10939.6 2.16E-09 4.698 4.6E-10947.8 1.61E-09 4.739 3.39E-10

937 4.44E-10 4.685 9.47E-11937.4 4.36E-10 4.687 9.31E-11954.8 2.17E-10 4.774 4.55E-11939.4 2.01E-10 4.697 4.28E-11

950 1.42E-10 4.75 2.99E-11Band Exposure Quotient: 9.76E-09

Frequency (MHz)



Exposure Quotient

1867 2.68E-09 9.335 2.87E-101852.4 6.64E-10 9.262 7.17E-111825.8 4.77E-10 9.129 5.22E-111866.4 2.94E-10 9.332 3.15E-111850.2 2.86E-10 9.251 3.09E-111868.4 2.43E-10 9.342 2.6E-111848.8 1.36E-10 9.244 1.47E-111866.8 8.09E-11 9.334 8.66E-121855.8 6.92E-11 9.279 7.45E-121863.2 3.24E-11 9.316 3.48E-12

Band Exposure Quotient: 5.34E-10

Frequency (MHz)



Exposure Quotient

391.675 1.55E-11 2 7.73E-12393.6 1.53E-11 2 7.66E-12

390.875 1.51E-11 2 7.57E-12390.175 1.44E-11 2 7.22E-12394.625 1.44E-11 2 7.21E-12393.525 1.44E-11 2 7.19E-12392.125 1.42E-11 2 7.12E-12391.575 1.42E-11 2 7.11E-12390.775 1.42E-11 2 7.09E-12

393.75 1.42E-11 2 7.08E-12Band Exposure Quotient: 7.3E-11

Measurement location: Car park rear of St Peters Court

GSM 900

1E-121E-101E-081E-06

0.00010.01

1100

921

924

926

929

931

934

937

939

942

944

947

950

952

955

957

960

Power Density ICNIRP Limit

GSM 1800

1E-13

1E-11

1E-09

1E-07

1E-05

0.001

0.1

10

1820

1824

1828

1832

1836

1840

1844

1848

1852

1856

1860

1864

1868

1872

1876

1880

PowerDensity ICNIRP Limit

TETRA (low)

1E-121E-101E-081E-06

0.00010.01

1100

390

390

391

391

391

392

392

392

393

393

393

394

394

394

395

395


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Frequency (MHz)



Exposure Quotient

2142.5 5.12E-10 10 5.12E-112162.3 2.78E-10 10 2.78E-112112.8 8.48E-11 10 8.48E-122152.4 2.81E-11 10 2.81E-122167.2 7.61E-12 10 7.61E-132157.2 3.18E-12 10 3.18E-132137.4 3.11E-12 10 3.11E-132147.3 3.11E-12 10 3.11E-132132.6 3.09E-12 10 3.09E-132117.7 3.09E-12 10 3.09E-13


UMTS

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

100

2113 2118 2133 2137 2143 2147 2152 2157 2162 2167


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Site: Bolton Community CollegeLocation: Access to Back Hilden StreetTotal Band Exposure Quotient: 2.31627E-09Total Number of Measurements: 4NGR: SD 7239 0881Start time: 20/05/2008 11:15Officer: JL and DT

Frequency (MHz)



Exposure Quotient

948 6.27E-09 4.74 1.32E-09948.2 2.22E-09 4.741 4.68E-10937.2 5.39E-10 4.686 1.15E-10939.6 3.66E-10 4.698 7.79E-11947.8 3.43E-10 4.739 7.25E-11959.8 2.24E-10 4.799 4.67E-11939.8 1.02E-10 4.699 2.18E-11954.8 9.16E-11 4.774 1.92E-11930.8 7.02E-11 4.654 1.51E-11956.2 7E-11 4.781 1.46E-11


Frequency (MHz)



Exposure Quotient



Frequency (MHz)



Exposure Quotient

393.525 1.76E-11 2 8.81E-12391.25 1.61E-11 2 8.03E-12

390.575 1.59E-11 2 7.95E-12394.475 1.59E-11 2 7.93E-12392.075 1.58E-11 2 7.91E-12

394.95 1.56E-11 2 7.79E-12392.525 1.55E-11 2 7.75E-12393.075 1.54E-11 2 7.7E-12

394.6 1.53E-11 2 7.67E-12390 1.5E-11 2 7.49E-12


Measurement location: Access to Back Hilden Street

GSM 900

1E-121E-101E-081E-06

0.00010.01

1100

921

924

926

929

931

934

937

939

942

944

947

950

952

955

957

960


GSM 1800

1E-13

1E-11

1E-09

1E-07

1E-05

0.001

0.1

10

1820

1824

1828

1832

1836

1840

1844

1848

1852

1856

1860

1864

1868

1872

1876

1880


TETRA (low)

1E-121E-101E-081E-06

0.00010.01

1100

390

390

391

391

391

392

392

392

393

393

393

394

394

394

395

395


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Frequency (MHz)



Exposure Quotient



UMTS

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

100

2113 2118 2133 2137 2143 2147 2152 2157 2162 2167


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Site: Bolton Community CollegeLocation: Selwyn Street facing St Peters WayTotal Band Exposure Quotient: 6.98911E-10Total Number of Measurements: 4NGR: SD 7242 0877Start time: 20/05/2008 11:22Officer: JL and DT

Frequency (MHz)



Exposure Quotient

948 1.53E-09 4.74 3.22E-10948.2 5.56E-10 4.741 1.17E-10954.8 3.77E-10 4.774 7.89E-11947.8 8.57E-11 4.739 1.81E-11954.6 5.39E-11 4.773 1.13E-11

955 4.15E-11 4.775 8.68E-12954.4 3.47E-11 4.772 7.28E-12930.8 3.2E-11 4.654 6.87E-12936.2 2.13E-11 4.681 4.55E-12

950 1.33E-11 4.75 2.8E-12Band Exposure Quotient: 5.78E-10

Frequency (MHz)



Exposure Quotient



Frequency (MHz)



Exposure Quotient

394.675 1.76E-11 2 8.8E-12392.8 1.62E-11 2 8.08E-12

394.775 1.6E-11 2 8E-12390.9 1.59E-11 2 7.94E-12

393.525 1.58E-11 2 7.91E-12393 1.55E-11 2 7.77E-12

392.375 1.54E-11 2 7.7E-12390.475 1.48E-11 2 7.4E-12

393.45 1.46E-11 2 7.32E-12391.025 1.46E-11 2 7.3E-12


Measurement location: Selwyn Street facing St Peters Way

GSM 900

1E-121E-101E-081E-06

0.00010.01

1100

921

924

926

929

931

934

937

939

942

944

947

950

952

955

957

960


GSM 1800

1E-13

1E-11

1E-09

1E-07

1E-05

0.001

0.1

10

1820

1824

1828

1832

1836

1840

1844

1848

1852

1856

1860

1864

1868

1872

1876

1880


TETRA (low)

1E-121E-101E-081E-06

0.00010.01

1100

390

390

391

391

391

392

392

392

393

393

393

394

394

394

395

395


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Frequency (MHz)



Exposure Quotient



UMTS

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

100

2113 2118 2133 2137 2143 2147 2152 2157 2162 2167


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Site: Bolton Community CollegeLocation: Traffic lights & foot crossing, Braford StTotal Band Exposure Quotient: 1.05833E-08Total Number of Measurements: 4NGR: SD 7235 0889Start time: 20/05/2008 11:38Officer: JL and DT

Frequency (MHz)



Exposure Quotient

948 3.22E-08 4.74 6.79E-09948.2 1.08E-08 4.741 2.27E-09947.8 1.68E-09 4.739 3.55E-10937.2 1.11E-09 4.686 2.37E-10939.6 7.27E-10 4.698 1.55E-10930.8 2.34E-10 4.654 5.02E-11939.4 2.33E-10 4.697 4.95E-11937.4 1.95E-10 4.687 4.15E-11939.8 1.61E-10 4.699 3.42E-11

950 1.52E-10 4.75 3.21E-11Band Exposure Quotient: 1E-08

Frequency (MHz)



Exposure Quotient



Frequency (MHz)



Exposure Quotient

390.575 1.64E-11 2 8.22E-12393.1 1.61E-11 2 8.07E-12

393.175 1.61E-11 2 8.03E-12393.575 1.59E-11 2 7.97E-12390.775 1.59E-11 2 7.96E-12

392.05 1.58E-11 2 7.92E-12394.225 1.55E-11 2 7.74E-12

394.7 1.53E-11 2 7.64E-12393.725 1.53E-11 2 7.63E-12


Measurement location: Traffic lights & foot crossing, Braford St

GSM 900

1E-121E-101E-081E-06

0.00010.01

1100

921

924

926

929

931

934

937

939

942

944

947

950

952

955

957

960


GSM 1800

1E-13

1E-11

1E-09

1E-07

1E-05

0.001

0.1

10

1820

1824

1828

1832

1836

1840

1844

1848

1852

1856

1860

1864

1868

1872

1876

1880


TETRA (low)

1E-121E-101E-081E-06

0.00010.01

1100

390

390

391

391

391

392

392

392

393

393

393

394

394

394

395

395


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Frequency (MHz)



Exposure Quotient



UMTS

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

100

2113 2118 2133 2137 2143 2147 2152 2157 2162 2167


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Site: Bolton Community CollegeLocation: Slip road down to St Peters WayTotal Band Exposure Quotient: 1.08535E-08Total Number of Measurements: 4NGR: SD 7237 0883Start time: 20/05/2008 11:45Officer: JL and DT

Frequency (MHz)



Exposure Quotient

948 3.31E-08 4.74 6.99E-09948.2 1.24E-08 4.741 2.61E-09947.8 2.05E-09 4.739 4.33E-10930.8 3.12E-10 4.654 6.7E-11959.8 1.95E-10 4.799 4.07E-11939.6 1.84E-10 4.698 3.92E-11937.2 1.63E-10 4.686 3.49E-11954.8 1.39E-10 4.774 2.92E-11

950 9.68E-11 4.75 2.04E-11939.8 8.04E-11 4.699 1.71E-11


Frequency (MHz)



Exposure Quotient



Frequency (MHz)



Exposure Quotient

390.35 1.88E-11 2 9.38E-12390.3 1.82E-11 2 9.1E-12394.7 1.77E-11 2 8.86E-12

392.525 1.76E-11 2 8.81E-12392.6 1.75E-11 2 8.76E-12

391.65 1.72E-11 2 8.59E-12393.425 1.71E-11 2 8.56E-12

390.65 1.69E-11 2 8.43E-12391.6 1.65E-11 2 8.25E-12


Measurement location: Slip road down to St Peters Way

GSM 900

1E-121E-101E-081E-06

0.00010.01

1100

921

924

926

929

931

934

937

939

942

944

947

950

952

955

957

960


GSM 1800

1E-13

1E-11

1E-09

1E-07

1E-05

0.001

0.1

10

1820

1824

1828

1832

1836

1840

1844

1848

1852

1856

1860

1864

1868

1872

1876

1880


TETRA (low)

1E-121E-101E-081E-06

0.00010.01

1100

390

390

391

391

391

392

392

392

393

393

393

394

394

394

395

395


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Frequency (MHz)



Exposure Quotient



UMTS

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

100

2113 2118 2133 2137 2143 2147 2152 2157 2162 2167


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EM Exposure Background

All radio waves are electromagnetic waves (“EM”), which are composed of electric and magnetic fields. These waves are referred to as ‘non-ionising radiation’ as distinct from the ionising radiation produced by radioactive sources. We are all regularly exposed to EM radiation from a variety of sources.

Exposure to EM waves is measured in terms of the electric and magnetic field strengths, which are produced by a transmitter at locations, which could be accessed by the public. The electric field strength, E, is measured in volts per meter [V.m-1]. The power that could be absorbed by an object at a given location is proportional to the area of the object multiplied by the square of the electric field strength.

In this report, the Exposure Quotient (“EQ”) is calculated to express the ratio of the measured power density levels (expressed in W/m2) to the ICNIRP Reference power density levels (derived from the Reference field strength levels). The EQ is then summed over all the frequencies in each of the surveyed bands to yield the band exposure quotient as shown in the Survey Results section of this document. A band EQ of 1 (unity) means that the ICNIRP Reference level has been reached at the surveyed frequency band.

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Site: Location:

Band: NGR:

GPS: Start Time: Officer: Receiver: Antenna:Exposure:

Power Density:

ICNIRP Limit:

Frequency Exposure Quotient:

Band Exposure Quotient:

Total Band Exposure Quotient:

GSM: TETRA: UMTS:

1.00E-03: 1.00E-06: 1.00E-09: 1.00E-12:

Equal to one millionthEqual to one thousand-millionthEqual to one million-millionth

Global System for Mobile communicationTerrestrial Trunked RadioUniversal Mobile Telecommunications System (Third Generation mobile-phone services)

Exponential (or ‘scientific’) number format. Equal to one thousandth

The reference level given by the International Commission for Non-Ionizing Radiation Protection (ICNIRP) for general public exposure to electromagnetic fields

The ratio of the measured maximum power density to the ICNIRP limit at a given frequency. A value close to 1 signifies that exposure levels could be near to the ICNIRP limit for that frequency

The sum of the frequency exposure quotients for a single band at a location

The sum of the frequency exposure quotients for all of the measured bands at a location

The receiver used to perform the measurementsThe antenna used to perform the measurementsThe maximum measured electric field strength (dB(�V/m)) converted to an equivalent power density (W/m²)

The electromagnetic energy flowing through a unit area normal to the direction of propagation in a unit time. Measured in Watts per square metre (W/m²)

The Ordnance Survey national grid reference coordinates of the location. In this survey NGRs are specified to 8-digit (10-metre) resolution. E.g. SJ 9755 9888The Global Positioning SystemThe date and time at which the receiver started taking its measurements at a locationThe name of the Ofcom representative who carried out the audit

Glossary

The position within a site at which a single set of measurements is taken. A set of measurements consists of multiple scans of many frequencies within a number of bands

The building or area around which sets of measurements are taken

A portion of the electromagnetic spectrum reserved for specific radio services

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mobile phone base-station audit · 1868.4 7.04e-12 9.342 7.54e-13 1850.2 6.45e-12 9.251 6.97e-13...

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