Mobile Phone Base-Station Audit - Ofcom€¦ · Site: Warley Water Tower Location: Harborne Rd opp Warley Water Tower Total Band Exposure Quotient: 8.38354E-06 Total Number of Measurements:

Audit site: Warley Water Tower

Harborne Road

Olbury

Birmingham

West Midlands

B68

(no photo)

Mobile Phone

Base-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 grIeen 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

Page 1 of 15

Summary of results:

Location Total band exposure Relationship to ICNIRP Limit

Entrance to Castle Croft 4.66E-05 1/ 21458

Harborne Rd opp Warley Water Tower 8.38E-06 1/ 119281

Lenwade Road opposite Number 4 7.91E-06 1/ 126370

Hadzor Road Outside Number 24 2.67E-06 1/ 374951

Outside 20 Hadzor Road 2.1E-06 1/ 476885

Issued on behalf of Ofcom.

Issued by: Received by:

JB Local Resident

Field Engineer

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 Warley Water

Tower on 24/11/2009

Page 2 of 15

1.

2.

3.

Survey equipment

The measurements were performed using:

*

*

Receiver:

Manufacturer: Rohde & Schwarz

Model: FSH6

Serial Number: 100684

Probe:

Manufacturer: Rohde & Schwarz

Model: TS-EMF

Serial Number: 100039

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 designed

and 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.

Page 3 of 15

Site: Warley Water Tower

Location: Outside 20 Hadzor Road

Total Band Exposure Quotient: 2.09694E-06

Total Number of Measurements: 3

NGR: SP 0079 8572

Start time: 24/11/2009 12:24

Officer: JB

(no photo)

Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

950 5.64E-07 4.75 1.19E-07

950.2 2.27E-07 4.751 4.77E-08

937 8.74E-08 4.685 1.87E-08

938.6 7.03E-08 4.693 1.5E-08

937.8 6.96E-08 4.689 1.48E-08

949.8 3.51E-08 4.749 7.4E-09

948.2 3.44E-08 4.741 7.27E-09

954.4 2.8E-08 4.772 5.87E-09

938 2.2E-08 4.69 4.68E-09

937.2 2.15E-08 4.686 4.59E-09

Band Exposure Quotient: 2.45E-07

Measurement location: Outside 20 Hadzor Road

1E-091E-08

0.00000010.000001

0.000010.0001

0.0010.01

0.11

921

924.6

928.4

932.2

936

939.8

943.6

947.4

951.2

955

958.8

GSM 900

Power Density ICNIRP Limit

Page 4 of 15

Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

1864.6 6.6E-07 9.323 7.08E-08

1834.8 3.04E-07 9.174 3.32E-08

1852.8 2.33E-07 9.264 2.51E-08

1854 1.22E-07 9.27 1.32E-08

1850 9.76E-08 9.25 1.05E-08

1836.6 8.82E-08 9.183 9.6E-09

1859.8 7.89E-08 9.299 8.48E-09

1856.2 6.06E-08 9.281 6.53E-09

1837.8 3.92E-08 9.189 4.26E-09

1864.8 3.69E-08 9.324 3.96E-09


Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

2142.5 1.08E-05 10 1.08E-06

2167.2 3.24E-06 10 3.24E-07

2162.3 1.58E-06 10 1.58E-07

2152.4 6.17E-07 10 6.17E-08

2157.2 7.95E-08 10 7.95E-09

2147.3 7.44E-08 10 7.44E-09

2137.4 7.15E-08 10 7.15E-09

2132.6 6.91E-08 10 6.91E-09

2117.7 6.59E-08 10 6.59E-09

2112.8 6.48E-08 10 6.48E-09


1E-091E-08

0.00000010.000001

0.000010.0001

0.0010.01

0.11

1820

1825.4

1831

1836.6

1842.2

1847.8

1853.4

1859

1864.6

1870.2

1875.8

GSM 1800

PowerDensity ICNIRP Limit

1E-080.0000001

0.0000010.00001

0.00010.001

0.010.1

110

UMTS


Page 5 of 15


Location: Entrance to Castle Croft



NGR: SP 0093 8567

Start time: 24/11/2009 12:41

Officer: JB

(no photo)

Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

937 1.35E-05 4.685 2.87E-06

949.6 1.25E-05 4.748 2.63E-06

950 1.15E-05 4.75 2.43E-06

949.8 5.24E-06 4.749 1.1E-06

950.2 4.5E-06 4.751 9.46E-07

936.2 3.24E-06 4.681 6.93E-07

935.4 2.47E-06 4.677 5.28E-07

937.8 1.88E-06 4.689 4.01E-07

938.6 1.83E-06 4.693 3.9E-07

937.2 1.78E-06 4.686 3.79E-07


Measurement location: Entrance to Castle Croft

1E-091E-08

0.00000010.000001

0.000010.0001

0.0010.01

0.11

921

924.6

928.4

932.2

936

939.8

943.6

947.4

951.2

955

958.8

GSM 900


Page 6 of 15

Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

1875 0.000187 9.375 2E-05

1864.6 1.64E-05 9.323 1.76E-06

1874.8 3.56E-06 9.374 3.8E-07

1875.2 3.18E-06 9.376 3.39E-07

1834.8 2.52E-06 9.174 2.75E-07

1864.8 2.26E-06 9.324 2.42E-07

1873.8 2.04E-06 9.369 2.18E-07

1836.6 1.97E-06 9.183 2.14E-07

1837.8 1.96E-06 9.189 2.13E-07

1832.8 1.93E-06 9.164 2.1E-07


Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

2142.5 8.42E-05 10 8.42E-06

2152.4 8.3E-06 10 8.3E-07

2162.3 6.87E-06 10 6.87E-07

2167.2 4.31E-06 10 4.31E-07

2157.2 8.63E-08 10 8.63E-09

2147.3 7.96E-08 10 7.96E-09

2117.7 7.82E-08 10 7.82E-09

2137.4 7.5E-08 10 7.5E-09

2132.6 7.35E-08 10 7.35E-09

2112.8 7.32E-08 10 7.32E-09


0.000001

0.00001

0.0001

0.001

0.01

0.1

1

1820

1825

1830.2

1835.4

1840.6

1845.8

1851

1856.2

1861.4

1866.6

1871.8

1877

GSM 1800


1E-080.0000001

0.0000010.00001

0.00010.001

0.010.1

110

UMTS


Page 7 of 15


Location: Harborne Rd opp Warley Water Tower



NGR: SP 0094 8580

Start time: 24/11/2009 12:49

Officer: JB

(no photo)

Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

949.6 1.31E-05 4.748 2.77E-06

935.4 6.69E-06 4.677 1.43E-06

949.8 4.98E-06 4.749 1.05E-06

936.2 1.58E-06 4.681 3.37E-07

954.4 1.56E-06 4.772 3.26E-07

935.2 1.5E-06 4.676 3.22E-07

949.4 6.87E-07 4.747 1.45E-07

935.6 6.76E-07 4.678 1.45E-07

953 5.47E-07 4.765 1.15E-07

936.4 4.66E-07 4.682 9.95E-08


Measurement location: Harborne Rd opp Warley Water Tower

1E-091E-08

0.00000010.000001

0.000010.0001

0.0010.01

0.11

921

924.6

928.4

932.2

936

939.8

943.6

947.4

951.2

955

958.8

GSM 900


Page 8 of 15

Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

1875 3.97E-06 9.375 4.23E-07

1832.8 1.62E-06 9.164 1.77E-07

1856.2 1.61E-06 9.281 1.74E-07

1873.8 2.92E-07 9.369 3.12E-08

1841.8 8.42E-08 9.209 9.14E-09

1833 6.5E-08 9.165 7.09E-09

1846 5.33E-08 9.23 5.78E-09

1865 4.98E-08 9.325 5.34E-09

1874.8 4.9E-08 9.374 5.22E-09

1875.2 4.49E-08 9.376 4.79E-09


Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

2162.3 3.06E-06 10 3.06E-07

2152.4 1.81E-06 10 1.81E-07

2142.5 1.37E-06 10 1.37E-07

2167.2 1.35E-06 10 1.35E-07

2157.2 8.75E-08 10 8.75E-09

2112.8 8.65E-08 10 8.65E-09

2117.7 8.62E-08 10 8.62E-09

2147.3 8.31E-08 10 8.31E-09

2137.4 7.58E-08 10 7.58E-09

2132.6 7.48E-08 10 7.48E-09


1E-091E-08

0.00000010.000001

0.000010.0001

0.0010.01

0.11

1820

1825.4

1831

1836.6

1842.2

1847.8

1853.4

1859

1864.6

1870.2

1875.8

GSM 1800


1E-080.0000001

0.0000010.00001

0.00010.001

0.010.1

110

UMTS


Page 9 of 15


Location: Lenwade Road opposite Number 4



NGR: SP 0081 8587

Start time: 24/11/2009 12:59

Officer: JB

(no photo)

Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

947.6 2.14E-06 4.738 4.51E-07

954.4 1.64E-06 4.772 3.43E-07

947.8 6.89E-07 4.739 1.45E-07

948.2 5.78E-07 4.741 1.22E-07

953 4.02E-07 4.765 8.43E-08

954.2 2.59E-07 4.771 5.43E-08

948.4 2.06E-07 4.742 4.35E-08

954.6 1.8E-07 4.773 3.77E-08

947.4 1.29E-07 4.737 2.73E-08

952.8 5.31E-08 4.764 1.11E-08


Measurement location: Lenwade Road opposite Number 4

1E-091E-08

0.00000010.000001

0.000010.0001

0.0010.01

0.11

921

924.6

928.4

932.2

936

939.8

943.6

947.4

951.2

955

958.8

GSM 900


Page 10 of 15

Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

1856.2 2.98E-05 9.281 3.21E-06

1850.8 2.08E-06 9.254 2.25E-07

1841.8 1.33E-06 9.209 1.45E-07

1847.6 1.29E-06 9.238 1.39E-07

1856 2.98E-07 9.28 3.21E-08

1856.4 2.53E-07 9.282 2.72E-08

1864.6 2.4E-07 9.323 2.58E-08

1834.2 1.67E-07 9.171 1.82E-08

1850.6 8.44E-08 9.253 9.12E-09

1820 5.78E-08 9.1 6.35E-09


Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

2142.5 1.97E-05 10 1.97E-06

2162.3 3.08E-06 10 3.08E-07

2167.2 2.81E-06 10 2.81E-07

2152.4 1.57E-06 10 1.57E-07

2157.2 8.71E-08 10 8.71E-09

2147.3 8.01E-08 10 8.01E-09

2137.4 7.56E-08 10 7.56E-09

2132.6 7.36E-08 10 7.36E-09

2117.7 7.15E-08 10 7.15E-09

2112.8 6.92E-08 10 6.92E-09


1E-091E-08

0.00000010.000001

0.000010.0001

0.0010.01

0.11

1820

1825.4

1831

1836.6

1842.2

1847.8

1853.4

1859

1864.6

1870.2

1875.8

GSM 1800


1E-080.0000001

0.0000010.00001

0.00010.001

0.010.1

110

UMTS


Page 11 of 15


Location: Hadzor Road Outside Number 24



NGR: SP 0076 8576

Start time: 24/11/2009 13:10

Officer: JB

(no photo)

Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

954.4 6.7E-07 4.772 1.4E-07

950 5.08E-07 4.75 1.07E-07

950.2 1.85E-07 4.751 3.89E-08

937 1.75E-07 4.685 3.74E-08

938.6 1.72E-07 4.693 3.66E-08

937.8 1.55E-07 4.689 3.31E-08

954.2 1.02E-07 4.771 2.13E-08

947.6 1.01E-07 4.738 2.13E-08

954.6 6.73E-08 4.773 1.41E-08

953 6E-08 4.765 1.26E-08


Measurement location: Hadzor Road Outside Number 24

1E-091E-08

0.00000010.000001

0.000010.0001

0.0010.01

0.11

921

924.6

928.4

932.2

936

939.8

943.6

947.4

951.2

955

958.8

GSM 900


Page 12 of 15

Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

1864.6 4.97E-06 9.323 5.33E-07

1834.8 1.07E-06 9.174 1.16E-07

1856.2 2.91E-07 9.281 3.14E-08

1825.6 2.6E-07 9.128 2.85E-08

1854 2.52E-07 9.27 2.72E-08

1859.8 2.47E-07 9.299 2.66E-08

1836.6 2.42E-07 9.183 2.64E-08

1822.2 2.37E-07 9.111 2.6E-08

1850 2.23E-07 9.25 2.41E-08

1852.8 2.07E-07 9.264 2.23E-08


Frequency

(MHz)

Power

Density

(W/m2)

ICNIRP

Maximum

(W/m2)

Exposure

Quotient

2142.5 5.62E-06 10 5.62E-07

2167.2 3.87E-06 10 3.87E-07

2162.3 2.85E-06 10 2.85E-07

2152.4 6.14E-07 10 6.14E-08

2157.2 8.88E-08 10 8.88E-09

2147.3 8.13E-08 10 8.13E-09

2137.4 7.77E-08 10 7.77E-09

2132.6 7.46E-08 10 7.46E-09

2117.7 7.07E-08 10 7.07E-09

2112.8 6.98E-08 10 6.98E-09


1E-091E-08

0.00000010.000001

0.000010.0001

0.0010.01

0.11

1820

1825.4

1831

1836.6

1842.2

1847.8

1853.4

1859

1864.6

1870.2

1875.8

GSM 1800


1E-080.0000001

0.0000010.00001

0.00010.001

0.010.1

110

UMTS


Page 13 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.

Page 14 of 15

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 millionth

Equal to one thousand-millionth

Equal to one million-millionth

Global System for Mobile communication

Terrestrial Trunked Radio

Universal 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 measurements

The antenna used to perform the measurements

The maximum measured electric field strength (dB(μV/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 9888

The Global Positioning System

The date and time at which the receiver started taking its measurements at a location

The 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

Page 15 of 15

Documents

Mobile Phone Base-Station Audit - Ofcom€¦ · Site: Warley Water Tower Location: Harborne Rd opp Warley Water Tower Total Band Exposure Quotient: 8.38354E-06 Total Number of Measurements: