mobile phone base-station audit - ofcom1868.4 8.03e-07 9.342 8.59e-08 1873.6 4.62e-07 9.368 4.93e-08...

Audit site: Kings Monkton School6 West Road

CardiffCF24 3XL

(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 LimitPlayground next to senior school 1.29E-05 1/ 77526

Playground adjacent to primary school 5.19E-06 1/ 192752Classroom VP 4.24E-06 1/ 236072Dining Room 3.6E-06 1/ 277808Classroom 6T 3.37E-06 1/ 296948

Issued on behalf of Ofcom.

Issued by: Received by:

JB & CD Roger GriffinField engineer Principal

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 Kings Monkton School on 03/06/2008

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

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1.

2.

3.

Survey equipment

The measurements were performed using:

*

*

Receiver:Manufacturer: Rohde & SchwarzModel: FSH6Serial Number: 100586

Probe:Manufacturer: Rohde & SchwarzModel: TS-EMFSerial Number: 100045

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: Kings Monkton SchoolLocation: Dining RoomTotal Band Exposure Quotient: 3.59961E-06Total Number of Measurements: 5NGR: ST 1884 7707Start time: 03/06/2008 14:13Officer: JB & CD

(no photo)

Frequency (MHz)

Power Density (W/m2)

ICNIRP Maximum (W/m2)

Exposure Quotient

952.4 7.15E-07 4.762 1.5E-07926 3.07E-07 4.63 6.63E-08

935.4 2.39E-07 4.677 5.1E-08948.6 1.76E-07 4.743 3.72E-08925.8 1.08E-07 4.629 2.34E-08952.6 1.09E-07 4.763 2.29E-08950.2 8.77E-08 4.751 1.85E-08952.2 8.5E-08 4.761 1.78E-08948.8 6.38E-08 4.744 1.34E-08935.6 5.9E-08 4.678 1.26E-08

Band Exposure Quotient: 4.13E-07

Frequency (MHz)



Exposure Quotient

1861 1.11E-06 9.305 1.19E-071868.4 8.03E-07 9.342 8.59E-081873.6 4.62E-07 9.368 4.93E-081858.2 2.38E-07 9.291 2.56E-081864.4 2.26E-07 9.322 2.42E-081867.6 1.98E-07 9.338 2.12E-081852.4 1.63E-07 9.262 1.76E-081848.8 1.42E-07 9.244 1.54E-08

1873 1.18E-07 9.365 1.26E-081870 1.04E-07 9.35 1.12E-08


Measurement location: Dining Room

GSM 900

0.000000001

0.0000001

0.00001

0.001

0.1

10

921

924

927

931

934

937

940

943

947

950

953

956

959

Power Density ICNIRP Limit

GSM 1800

0.000000001

0.0000001

0.00001

0.001

0.1

10

1820

1825

1829

1834

1838

1843

1848

1852

1857

1861

1866

1871

1875

1880

PowerDensity ICNIRP Limit

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Frequency (MHz)



Exposure Quotient

393.5 3.14E-07 2 1.57E-07393.475 3.11E-07 2 1.55E-07390.525 3.07E-07 2 1.54E-07391.325 3.06E-07 2 1.53E-07391.45 3.04E-07 2 1.52E-07393.85 3.01E-07 2 1.5E-07

392.275 2.95E-07 2 1.48E-07390.5 2.94E-07 2 1.47E-07

391.775 2.92E-07 2 1.46E-07393.75 2.9E-07 2 1.45E-07


Frequency (MHz)



Exposure Quotient

423.525 2.62E-07 2.117625 1.24E-07424.175 2.47E-07 2.120875 1.16E-07420.65 2.43E-07 2.10325 1.16E-07424.95 2.39E-07 2.12475 1.12E-07423.55 2.31E-07 2.11775 1.09E-07424.1 2.28E-07 2.1205 1.08E-07

420.775 2.21E-07 2.103875 1.05E-07421.1 2.2E-07 2.1055 1.04E-07423.1 2.18E-07 2.1155 1.03E-07421.4 2.17E-07 2.107 1.03E-07


Frequency (MHz)



Exposure Quotient

2162.3 4.71E-07 10 4.71E-082142.5 4.08E-07 10 4.08E-082167.2 4.02E-07 10 4.02E-082152.4 1.33E-07 10 1.33E-082112.8 1.01E-07 10 1.01E-082117.7 9.51E-08 10 9.51E-092132.6 9.29E-08 10 9.29E-092137.4 9.23E-08 10 9.23E-092147.3 9.17E-08 10 9.17E-092157.2 9.11E-08 10 9.11E-09


TETRA (low)

0.00000010.000001

0.000010.0001

0.0010.01

0.11

1039

0

390

391

391

392

392

392

393

393

393

394

394

395

395


TETRA (high)

0.00000010.000001

0.000010.0001

0.0010.01

0.11

10

420

420

421

421

422

422

422

423

423

423

424

424

425

425


UMTS

0.00000001

0.000001

0.0001

0.01

1

100

2112

.8

2117

.7

2132

.6

2137

.4

2142

.5

2147

.3

2152

.4

2157

.2

2162

.3

2167

.2


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Site: Kings Monkton SchoolLocation: Playground next to senior schoolTotal Band Exposure Quotient: 1.28988E-05Total Number of Measurements: 5NGR: ST 1885 7704Start time: 03/06/2008 14:33Officer: JB & CD

(no photo)

Frequency (MHz)



Exposure Quotient

952.4 1.32E-05 4.762 2.77E-06935.4 6.38E-06 4.677 1.36E-06

926 5.72E-06 4.63 1.24E-06952.6 2.01E-06 4.763 4.23E-07925.8 1.65E-06 4.629 3.57E-07952.2 1.35E-06 4.761 2.84E-07948.6 1.34E-06 4.743 2.83E-07935.2 6.94E-07 4.676 1.48E-07950.2 5.81E-07 4.751 1.22E-07948.8 5.23E-07 4.744 1.1E-07


Frequency (MHz)



Exposure Quotient

1861 9.54E-06 9.305 1.03E-061864.4 2.57E-06 9.322 2.76E-071868.4 1.6E-06 9.342 1.71E-071867.6 8.26E-07 9.338 8.85E-08

1870 6.4E-07 9.35 6.85E-081858.2 4.91E-07 9.291 5.28E-081873.6 4.57E-07 9.368 4.87E-081852.4 3.67E-07 9.262 3.96E-081871.4 2.89E-07 9.357 3.09E-081831.2 2.59E-07 9.156 2.82E-08


Measurement location: Playground next to senior school

GSM 900

0.000000001

0.0000001

0.00001

0.001

0.1

10

921

924

927

931

934

937

940

943

947

950

953

956

959


GSM 1800

0.000000001

0.0000001

0.00001

0.001

0.1

10

1820

1825

1829

1834

1838

1843

1848

1852

1857

1861

1866

1871

1875

1880


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Frequency (MHz)



Exposure Quotient

390.825 3.45E-07 2 1.73E-07390.075 3.39E-07 2 1.7E-07393.15 3.38E-07 2 1.69E-07391.6 3.29E-07 2 1.64E-07391.2 3.26E-07 2 1.63E-07

393.175 3.26E-07 2 1.63E-07392.75 3.18E-07 2 1.59E-07

391.075 3.14E-07 2 1.57E-07393.075 3.05E-07 2 1.53E-07391.575 3E-07 2 1.5E-07


Frequency (MHz)



Exposure Quotient

420.45 2.62E-07 2.10225 1.24E-07420.975 2.51E-07 2.104875 1.19E-07421.35 2.46E-07 2.10675 1.17E-07

421.825 2.42E-07 2.109125 1.15E-07420.8 2.34E-07 2.104 1.11E-07423.9 2.35E-07 2.1195 1.11E-07

420.675 2.29E-07 2.103375 1.09E-07424.5 2.31E-07 2.1225 1.09E-07

420.85 2.27E-07 2.10425 1.08E-07420.325 2.27E-07 2.101625 1.08E-07


Frequency (MHz)



Exposure Quotient



TETRA (low)

0.00000010.000001

0.000010.0001

0.0010.01

0.11

1039

0

390

391

391

392

392

392

393

393

393

394

394

395

395


TETRA (high)

0.00000010.000001

0.000010.0001

0.0010.01

0.11

10

420

420

421

421

422

422

422

423

423

423

424

424

425

425


UMTS

0.00000001

0.000001

0.0001

0.01

1

100

2112

.8

2117

.7

2132

.6

2137

.4

2142

.5

2147

.3

2152

.4

2157

.2

2162

.3

2167

.2


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Site: Kings Monkton SchoolLocation: Playground adjacent to primary schoolTotal Band Exposure Quotient: 5.18801E-06Total Number of Measurements: 5NGR: ST 1890 7696Start time: 03/06/2008 14:45Officer: JB & CD

(no photo)

Frequency (MHz)



Exposure Quotient

935.4 1.2E-06 4.677 2.57E-07926 1.15E-06 4.63 2.48E-07



Frequency (MHz)



Exposure Quotient

1868.4 5.45E-06 9.342 5.84E-071861 8.12E-07 9.305 8.73E-08

1848.8 2.82E-07 9.244 3.05E-081868.2 2.55E-07 9.341 2.73E-081848.4 2.18E-07 9.242 2.36E-081873.6 2.02E-07 9.368 2.16E-08

1872 1.84E-07 9.36 1.96E-081873 1.32E-07 9.365 1.41E-08

1858.2 1.08E-07 9.291 1.17E-081864.4 1.05E-07 9.322 1.13E-08


Measurement location: Playground adjacent to primary school

GSM 900

0.000000001

0.0000001

0.00001

0.001

0.1

10

921

924

927

931

934

937

940

943

947

950

953

956

959


GSM 1800

0.000000001

0.0000001

0.00001

0.001

0.1

10

1820

1825

1829

1834

1838

1843

1848

1852

1857

1861

1866

1871

1875

1880


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Frequency (MHz)



Exposure Quotient

392.4 4.08E-07 2 2.04E-07390.325 3.42E-07 2 1.71E-07392.375 3.38E-07 2 1.69E-07

391.7 3.37E-07 2 1.68E-07390.425 3.36E-07 2 1.68E-07391.15 3.25E-07 2 1.63E-07392.1 3.18E-07 2 1.59E-07

390.25 3.17E-07 2 1.58E-07393.075 3.09E-07 2 1.54E-07394.025 3.08E-07 2 1.54E-07


Frequency (MHz)



Exposure Quotient

424.825 3.01E-07 2.124125 1.42E-07423.125 2.66E-07 2.115625 1.26E-07420.975 2.64E-07 2.104875 1.25E-07421.025 2.64E-07 2.105125 1.25E-07424.225 2.43E-07 2.121125 1.14E-07

420.4 2.39E-07 2.102 1.14E-07424.25 2.38E-07 2.12125 1.12E-07424.2 2.35E-07 2.121 1.11E-07420.2 2.31E-07 2.101 1.1E-07

421.375 2.23E-07 2.106875 1.06E-07Band Exposure Quotient: 1.19E-06

Frequency (MHz)



Exposure Quotient



TETRA (low)

0.00000010.000001

0.000010.0001

0.0010.01

0.11

1039

0

390

391

391

392

392

392

393

393

393

394

394

395

395


TETRA (high)

0.00000010.000001

0.000010.0001

0.0010.01

0.11

10

420

420

421

421

422

422

422

423

423

423

424

424

425

425


UMTS

0.00000001

0.000001

0.0001

0.01

1

100

2112

.8

2117

.7

2132

.6

2137

.4

2142

.5

2147

.3

2152

.4

2157

.2

2162

.3

2167

.2


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Site: Kings Monkton SchoolLocation: Classroom 6TTotal Band Exposure Quotient: 3.36759E-06Total Number of Measurements: 5NGR: ST 1887 7697Start time: 03/06/2008 14:53Officer: JB & CD

(no photo)

Frequency (MHz)



Exposure Quotient

952.4 1.25E-07 4.762 2.63E-08948 1.06E-07 4.74 2.25E-08926 5.6E-08 4.63 1.21E-08

938.8 5.05E-08 4.694 1.08E-08948.2 4.04E-08 4.741 8.53E-09950.4 3.27E-08 4.752 6.88E-09925.8 2.27E-08 4.629 4.91E-09952.6 2.32E-08 4.763 4.88E-09935.4 2.21E-08 4.677 4.72E-09950.2 2.17E-08 4.751 4.56E-09


Frequency (MHz)



Exposure Quotient

1868.4 2.19E-06 9.342 2.34E-071873.6 4.39E-07 9.368 4.69E-081868.2 9.82E-08 9.341 1.05E-08

1873 9.01E-08 9.365 9.62E-091861 7.52E-08 9.305 8.08E-09

1860.6 6.59E-08 9.303 7.08E-091853.4 5.51E-08 9.267 5.95E-09

1870 4.88E-08 9.35 5.22E-091866 3.84E-08 9.33 4.12E-09

1848.8 3.63E-08 9.244 3.93E-09Band Exposure Quotient: 3.36E-07

Measurement location: Classroom 6T

GSM 900

0.000000001

0.0000001

0.00001

0.001

0.1

10

921

924

927

931

934

937

940

943

947

950

953

956

959


GSM 1800

0.000000001

0.0000001

0.00001

0.001

0.1

10

1820

1825

1829

1834

1838

1843

1848

1852

1857

1861

1866

1871

1875

1880


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Frequency (MHz)



Exposure Quotient

392.825 3.51E-07 2 1.76E-07391.625 3.51E-07 2 1.75E-07392.275 3.29E-07 2 1.65E-07393.975 3.27E-07 2 1.64E-07392.55 3.23E-07 2 1.62E-07393.05 3.18E-07 2 1.59E-07

390.875 3.18E-07 2 1.59E-07393.675 3.17E-07 2 1.59E-07390.825 3.1E-07 2 1.55E-07394.25 3.06E-07 2 1.53E-07


Frequency (MHz)



Exposure Quotient

421.625 2.78E-07 2.108125 1.32E-07420.225 2.6E-07 2.101125 1.24E-07423.525 2.54E-07 2.117625 1.2E-07420.475 2.49E-07 2.102375 1.19E-07420.625 2.49E-07 2.103125 1.18E-07420.75 2.46E-07 2.10375 1.17E-07

420.575 2.4E-07 2.102875 1.14E-07422 2.39E-07 2.11 1.13E-07

421.025 2.37E-07 2.105125 1.13E-07421.425 2.35E-07 2.107125 1.12E-07


Frequency (MHz)



Exposure Quotient



TETRA (low)

0.00000010.000001

0.000010.0001

0.0010.01

0.11

1039

0

390

391

391

392

392

392

393

393

393

394

394

395

395


TETRA (high)

0.00000010.000001

0.000010.0001

0.0010.01

0.11

10

420

420

421

421

422

422

422

423

423

423

424

424

425

425


UMTS

0.00000001

0.000001

0.0001

0.01

1

100

2112

.8

2117

.7

2132

.6

2137

.4

2142

.5

2147

.3

2152

.4

2157

.2

2162

.3

2167

.2


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Site: Kings Monkton SchoolLocation: Classroom VPTotal Band Exposure Quotient: 4.236E-06Total Number of Measurements: 5NGR: ST 1885 7701Start time: 03/06/2008 15:13Officer: JB & CD

(no photo)

Frequency (MHz)



Exposure Quotient

952.4 1.13E-06 4.762 2.37E-07926 9.39E-07 4.63 2.03E-07


Band Exposure Quotient: 1E-06

Frequency (MHz)



Exposure Quotient

1861 3.68E-07 9.305 3.95E-081852.4 9.67E-08 9.262 1.04E-081858.2 8.63E-08 9.291 9.29E-091867.6 8.46E-08 9.338 9.06E-091864.4 6.24E-08 9.322 6.69E-09

1870 6.11E-08 9.35 6.53E-091871.4 5.23E-08 9.357 5.59E-091860.2 2.39E-08 9.301 2.57E-09

1872 2.27E-08 9.36 2.42E-091869.6 2.04E-08 9.348 2.18E-09


Measurement location: Classroom VP

GSM 900

0.000000001

0.0000001

0.00001

0.001

0.1

10

921

924

927

931

934

937

940

943

947

950

953

956

959


GSM 1800

0.000000001

0.0000001

0.00001

0.001

0.1

10

1820

1825

1829

1834

1838

1843

1848

1852

1857

1861

1866

1871

1875

1880


of 15

Frequency (MHz)



Exposure Quotient

393.475 3.64E-07 2 1.82E-07390.525 3.53E-07 2 1.76E-07393.275 3.51E-07 2 1.76E-07392.375 3.51E-07 2 1.76E-07394.175 3.5E-07 2 1.75E-07390.45 3.49E-07 2 1.75E-07393.1 3.47E-07 2 1.74E-07

390.125 3.46E-07 2 1.73E-07391.1 3.42E-07 2 1.71E-07

392.275 3.37E-07 2 1.69E-07Band Exposure Quotient: 1.75E-06

Frequency (MHz)



Exposure Quotient

422.975 2.73E-07 2.114875 1.29E-07421.55 2.71E-07 2.10775 1.28E-07

422.775 2.7E-07 2.113875 1.27E-07421.35 2.62E-07 2.10675 1.24E-07421.6 2.59E-07 2.108 1.23E-07423.3 2.59E-07 2.1165 1.22E-07

421.85 2.57E-07 2.10925 1.22E-07425 2.55E-07 2.125 1.2E-07

422.3 2.53E-07 2.1115 1.2E-07420.575 2.51E-07 2.102875 1.19E-07


Frequency (MHz)



Exposure Quotient

2142.5 5E-07 10 5E-082162.3 1.66E-07 10 1.66E-082167.2 1.49E-07 10 1.49E-082152.4 1.26E-07 10 1.26E-082112.8 1.18E-07 10 1.18E-082117.7 1.07E-07 10 1.07E-082137.4 1.03E-07 10 1.03E-082147.3 1.03E-07 10 1.03E-082132.6 1.02E-07 10 1.02E-082157.2 1.01E-07 10 1.01E-08


TETRA (low)

0.00000010.000001

0.000010.0001

0.0010.01

0.11

1039

0

390

391

391

392

392

392

393

393

393

394

394

395

395


TETRA (high)

0.00000010.000001

0.000010.0001

0.0010.01

0.11

10

420

420

421

421

422

422

422

423

423

423

424

424

425

425


UMTS

0.00000010.000001

0.000010.0001

0.0010.01

0.11

10

2112

.8

2117

.7

2132

.6

2137

.4

2142

.5

2147

.3

2152

.4

2157

.2

2162

.3

2167

.2


of 15

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:

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 servicesThe 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 auditThe 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 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

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

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mobile phone base-station audit - ofcom1868.4 8.03e-07 9.342 8.59e-08 1873.6 4.62e-07 9.368 4.93e-08...

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