Mobile Phone Base-station Audit for Bedonwell Junior School

Russell Kent-Smith

Informations

• Publié par: Pheym
• Nombre de lectures: 16
• Langue: English

Extrait

Mobile Telephone Base-station

Radio Emission Audit

AUDIT SITE :

BEDONWELL JUNIOR SCHOOL

BEDONWELL ROAD

BELVEDERE

KENT

DA17 5PF

The Radiocommunications Agency (RA) is responsible for the management of

the civil radio spectrum in the UK.

The Government has asked the RA to

implement a national measurement programme to ensure that emissions from

cellular base stations do not exceed recommended guidelines.

RA engineers measure the power density of transmissions in the various radio

bands to be surveyed. The results, derived from electric field voltage

measurements, are referenced to and presented alongside the relevant

International Commission on Non-Ionizing Radiation Protection (ICNIRP)

recommended public maximum exposure levels.

On the left hand side of the

results page(s) is a graphical representation of the radio spectrum surveyed at

each location on the site.

At the top of each graph a dotted green line

indicates the ICNIRP recommended exposure level for that frequency band.

To the right hand side of each graph is a table showing the ten highest level

emissions recorded within a band. In addition to this report, results taken from

each audit site will be posted on the RA website at

www.radio.gov.uk

where

further information on the audit can be found.

Further explanation of the results and their context within ICNIRP guidelines

can be provided by the RA engineers at the time of the audit or by contacting

the RA on 020 7211 0211 or by e-mail at [e-mail].

The DfEE have issued advice and information about base stations to local

education authorities and schools in the DfEE’s ‘Spectrum’ publication.

Further information and contact points can also be found on the DfEE website

at

http://www.dfee.gov.uk/a-z/mobilephones.html

.

Page 1 of 8

27 Sep 2001

Printed:

MEA-V1.1

Report Summary

The Radiocommunications Agency performed this survey of the RF emission

environment prevailing in the vicinity of BEDONWELL JUNIOR SCHOOL on 11

September 2001.

As the radio spectrum is continually changing, these measurements can only

provide information on the RF conditions for the specific location(s) at the time of

the survey.

Issued on behalf of the Radiocommunications Agency

J0HN PROBERT

Radiocommunications Specialist

IVOR GORDO

HEAD MASTER

The following table, sorted in descending order of signal level, summarises the

results obtained at each measurement location.

Issued by:

Received by:

Summary of results:

Total Band

Exposure Quotient

Location

Relationship to

ICNIRP Public

Exposure Level

2.8965166917E-05

FURTHEST POINT ON

SPORTS FIELD

1/34524

1.6252303729E-05

CLASSROOM NUMBER

3.16

1/61529

1.5974270602E-05

MAIN PLAYGROUND

1/62600

1.3428481972E-05

CLASSROOMS 5/6 5/7

1/74468

1.3926917635E-06

ASSEMBLY HALL

1/718033

Page 2 of 8

27 Sep 2001

Printed:

MEA-V1.1

NGR:

TQ 4825 7823

Manufacturer:

Rohde & Schwarz

Serial Number:

758745/019

Model:

HE200.4050.3609.02

Location:

MAIN PLAYGROUND

Start Time:

11 Sep 2001

Engineer:

J0HN PROBERT

Site:

BEDONWELL JUNIOR SCHOOL

10:48:51

Serial Number:

837.752/028,V02.31-4052.4654.

Taken from GPS

Manufacturer:

ROHDE&SCHWARZ

Receiver:

Model:

EB200

Antenna:

ETACS 917-933 MHz

1E-13

1E-11

1E-09

1E-07

1E-05

0.001

0.1

10

917

920

923

927

930

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

925.600

1.512E-09

4.63

3.267E-10

925.625

1.444E-09

4.63

3.120E-10

925.650

1.174E-09

4.63

2.536E-10

925.550

1.174E-09

4.63

2.536E-10

925.575

1.046E-09

4.63

2.260E-10

925.675

8.505E-10

4.63

1.838E-10

925.525

6.753E-10

4.63

1.459E-10

925.500

2.396E-10

4.63

5.178E-11

925.700

2.289E-10

4.63

4.946E-11

925.475

6.753E-11

4.63

1.459E-11

Band Exposure Quotient :

2.020E-09

GSM 935-960 MHz

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

935

940

945

950

955

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

951.600

2.430E-07

4.76

5.107E-08

949.200

1.791E-07

4.75

3.775E-08

951.800

8.429E-08

4.76

1.771E-08

937.200

8.151E-08

4.69

1.739E-08

943.400

6.129E-08

4.72

1.299E-08

948.600

4.705E-08

4.74

9.921E-09

954.000

4.055E-08

4.77

8.501E-09

952.200

4.038E-08

4.76

8.482E-09

940.400

3.269E-08

4.70

6.952E-09

952.000

2.729E-08

4.76

5.733E-09

Band Exposure Quotient :

2.671E-07

GSM 1808-1880 MHz

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

1808

1823

1837

1851

1866

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

1,853.400

4.721E-05

9.27

5.095E-06

1,867.200

3.930E-05

9.34

4.210E-06

1,849.000

2.575E-05

9.24

2.785E-06

1,869.000

2.117E-05

9.35

2.266E-06

1,871.800

1.312E-06

9.36

1.402E-07

1,831.400

9.069E-07

9.16

9.904E-08

1,817.200

8.648E-07

9.09

9.518E-08

1,817.600

5.987E-07

9.09

6.588E-08

1,821.800

5.893E-07

9.11

6.470E-08

1,854.400

5.068E-07

9.27

5.465E-08

Band Exposure Quotient :

1.571E-05

Total Band Exposure Quotient :

1.597E-05

Number of Frequencies Used in Quotient :

1128

Page 3 of 8

27 Sep 2001

Printed:

MEA-V1.1

NGR:

TQ 4825 7822

Manufacturer:

Rohde & Schwarz

Serial Number:

758745/019

Model:

HE200.4050.3609.02

Location:

ASSEMBLY HALL

Start Time:

11 Sep 2001

Engineer:

J0HN PROBERT

Site:

BEDONWELL JUNIOR SCHOOL

11:11:36

Serial Number:

837.752/028,V02.31-4052.4654.

Taken from GPS

Manufacturer:

ROHDE&SCHWARZ

Receiver:

Model:

EB200

Antenna:

ETACS 917-933 MHz

1E-13

1E-11

1E-09

1E-07

1E-05

0.001

0.1

10

917

920

923

927

930

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

925.625

2.752E-11

4.63

5.946E-12

925.600

2.568E-11

4.63

5.549E-12

925.575

1.547E-11

4.63

3.343E-12

925.550

1.512E-11

4.63

3.267E-12

925.650

1.317E-11

4.63

2.846E-12

925.675

9.993E-12

4.63

2.159E-12

925.525

5.882E-12

4.63

1.271E-12

925.800

5.126E-12

4.63

1.107E-12

925.700

4.568E-12

4.63

9.869E-13

927.825

3.998E-12

4.64

8.618E-13

Band Exposure Quotient :

9.332E-11

GSM 935-960 MHz

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

935

940

945

950

955

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

949.200

5.049E-08

4.75

1.064E-08

952.200

1.889E-08

4.76

3.967E-09

951.800

1.606E-08

4.76

3.375E-09

946.800

1.261E-08

4.73

2.664E-09

945.600

8.702E-09

4.73

1.840E-09

951.600

7.171E-09

4.76

1.507E-09

943.200

5.717E-09

4.72

1.212E-09

944.200

5.226E-09

4.72

1.107E-09

937.200

3.812E-09

4.69

8.136E-10

945.200

3.014E-09

4.73

6.378E-10

Band Exposure Quotient :

3.781E-08

GSM 1808-1880 MHz

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

1808

1823

1837

1851

1866

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

1,853.400

6.082E-06

9.27

6.563E-07

1,867.200

2.782E-06

9.34

2.980E-07

1,869.000

1.305E-06

9.35

1.397E-07

1,849.000

1.073E-06

9.24

1.161E-07

1,851.000

6.796E-07

9.26

7.343E-08

1,853.600

7.485E-08

9.27

8.076E-09

1,853.200

5.295E-08

9.27

5.715E-09

1,821.800

3.022E-08

9.11

3.318E-09

1,867.000

2.596E-08

9.34

2.781E-09

1,826.000

2.205E-08

9.13

2.416E-09

Band Exposure Quotient :

1.355E-06

Total Band Exposure Quotient :

1.393E-06

Number of Frequencies Used in Quotient :

1128

Page 4 of 8

27 Sep 2001

Printed:

MEA-V1.1

NGR:

TQ 4820 7815

Manufacturer:

Rohde & Schwarz

Serial Number:

758745/019

Model:

HE200.4050.3609.02

Location:

CLASSROOMS 5/6 5/7

Start Time:

11 Sep 2001

Engineer:

J0HN PROBERT

Site:

BEDONWELL JUNIOR SCHOOL

11:35:57

Serial Number:

837.752/028,V02.31-4052.4654.

Taken from GPS

Manufacturer:

ROHDE&SCHWARZ

Receiver:

Model:

EB200

Antenna:

ETACS 917-933 MHz

1E-13

1E-11

1E-09

1E-07

1E-05

0.001

0.1

10

917

920

923

927

930

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

925.625

4.262E-11

4.63

9.209E-12

925.600

4.262E-11

4.63

9.209E-12

925.575

3.712E-11

4.63

8.020E-12

925.650

2.628E-11

4.63

5.678E-12

925.550

2.452E-11

4.63

5.299E-12

926.775

1.953E-11

4.63

4.215E-12

925.675

1.621E-11

4.63

3.501E-12

925.525

1.379E-11

4.63

2.980E-12

926.825

1.352E-11

4.63

2.916E-12

929.175

1.105E-11

4.65

2.377E-12

Band Exposure Quotient :

1.528E-10

GSM 935-960 MHz

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

935

940

945

950

955

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

940.400

7.842E-08

4.70

1.668E-08

943.400

3.867E-08

4.72

8.198E-09

954.000

3.451E-08

4.77

7.236E-09

949.200

2.973E-08

4.75

6.264E-09

951.600

1.843E-08

4.76

3.874E-09

938.200

1.787E-08

4.69

3.810E-09

938.600

1.558E-08

4.69

3.320E-09

956.200

1.381E-08

4.78

2.889E-09

948.800

1.238E-08

4.74

2.610E-09

937.200

1.234E-08

4.69

2.633E-09

Band Exposure Quotient :

9.086E-08

GSM 1808-1880 MHz

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

1808

1823

1837

1851

1866

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

1,871.800

3.613E-05

9.36

3.860E-06

1,869.000

3.355E-05

9.35

3.591E-06

1,851.000

2.467E-05

9.26

2.666E-06

1,849.000

2.142E-05

9.24

2.317E-06

1,867.200

3.668E-06

9.34

3.929E-07

1,853.400

1.637E-06

9.27

1.766E-07

1,872.000

2.805E-07

9.36

2.997E-08

1,850.800

2.410E-07

9.25

2.605E-08

1,868.800

2.321E-07

9.34

2.484E-08

1,851.200

2.304E-07

9.26

2.489E-08

Band Exposure Quotient :

1.334E-05

Total Band Exposure Quotient :

1.343E-05

Number of Frequencies Used in Quotient :

1128

Page 5 of 8

27 Sep 2001

Printed:

MEA-V1.1

NGR:

TQ 4830 7810

Manufacturer:

Rohde & Schwarz

Serial Number:

758745/019

Model:

HE200.4050.3609.02

Location:

FURTHEST POINT ON SPORTS FIELD

Start Time:

11 Sep 2001

Engineer:

J0HN PROBERT

Site:

BEDONWELL JUNIOR SCHOOL

12:01:07

Serial Number:

837.752/028,V02.31-4052.4654.

Taken from GPS

Manufacturer:

ROHDE&SCHWARZ

Receiver:

Model:

EB200

Antenna:

ETACS 917-933 MHz

1E-13

1E-11

1E-09

1E-07

1E-05

0.001

0.1

10

917

920

923

927

930

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

925.600

3.233E-11

4.63

6.986E-12

925.625

2.689E-11

4.63

5.811E-12

925.575

2.087E-11

4.63

4.510E-12

925.650

1.948E-11

4.63

4.210E-12

925.550

1.620E-11

4.63

3.501E-12

926.375

1.289E-11

4.63

2.784E-12

926.425

1.123E-11

4.63

2.425E-12

926.400

1.123E-11

4.63

2.425E-12

925.675

1.071E-11

4.63

2.313E-12

925.825

9.996E-12

4.63

2.159E-12

Band Exposure Quotient :

1.396E-10

GSM 935-960 MHz

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

935

940

945

950

955

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

951.600

6.104E-08

4.76

1.283E-08

940.400

4.835E-08

4.70

1.028E-08

949.200

4.500E-08

4.75

9.481E-09

951.800

3.434E-08

4.76

7.216E-09

948.600

3.255E-08

4.74

6.864E-09

942.000

2.547E-08

4.71

5.407E-09

956.200

2.345E-08

4.78

4.905E-09

946.400

1.864E-08

4.73

3.939E-09

945.200

1.173E-08

4.73

2.481E-09

951.200

1.060E-08

4.76

2.228E-09

Band Exposure Quotient :

9.644E-08

GSM 1808-1880 MHz

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

1808

1823

1837

1851

1866

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

1,849.000

1.448E-04

9.24

1.566E-05

1,869.000

7.866E-05

9.35

8.417E-06

1,851.000

1.630E-05

9.26

1.761E-06

1,871.800

1.169E-05

9.36

1.249E-06

1,867.200

1.010E-05

9.34

1.082E-06

1,849.200

1.124E-06

9.25

1.216E-07

1,848.800

9.786E-07

9.24

1.059E-07

1,869.200

5.571E-07

9.35

5.960E-08

1,868.800

4.961E-07

9.34

5.310E-08

1,821.800

1.739E-07

9.11

1.909E-08

Band Exposure Quotient :

2.887E-05

Total Band Exposure Quotient :

2.897E-05

Number of Frequencies Used in Quotient :

1128

Page 6 of 8

27 Sep 2001

Printed:

MEA-V1.1

NGR:

TQ 4826 7820

Manufacturer:

Rohde & Schwarz

Serial Number:

758745/019

Model:

HE200.4050.3609.02

Location:

CLASSROOM NUMBER 3.16

Start Time:

11 Sep 2001

Engineer:

J0HN PROBERT

Site:

BEDONWELL JUNIOR SCHOOL

12:54:48

Serial Number:

837.752/028,V02.31-4052.4654.

Taken from GPS

Manufacturer:

ROHDE&SCHWARZ

Receiver:

Model:

EB200

Antenna:

ETACS 917-933 MHz

1E-13

1E-11

1E-09

1E-07

1E-05

0.001

0.1

10

917

920

923

927

930

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

925.600

9.112E-11

4.63

1.969E-11

925.575

8.310E-11

4.63

1.796E-11

925.625

7.936E-11

4.63

1.715E-11

925.550

7.405E-11

4.63

1.600E-11

925.650

6.755E-11

4.63

1.460E-11

925.675

3.799E-11

4.63

8.208E-12

925.525

2.185E-11

4.63

4.722E-12

925.500

1.411E-11

4.63

3.049E-12

925.700

1.287E-11

4.63

2.781E-12

925.825

9.996E-12

4.63

2.159E-12

Band Exposure Quotient :

1.831E-10

GSM 935-960 MHz

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

935

940

945

950

955

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

951.800

7.688E-08

4.76

1.615E-08

951.600

7.338E-08

4.76

1.542E-08

937.200

6.625E-08

4.69

1.414E-08

949.200

5.665E-08

4.75

1.194E-08

948.600

4.391E-08

4.74

9.259E-09

942.000

4.036E-08

4.71

8.570E-09

942.600

3.138E-08

4.71

6.657E-09

952.200

2.859E-08

4.76

6.005E-09

941.200

2.787E-08

4.71

5.923E-09

938.200

2.644E-08

4.69

5.636E-09

Band Exposure Quotient :

1.506E-07

GSM 1808-1880 MHz

1E-12

1E-10

1E-08

1E-06

0.0001

0.01

1

1808

1823

1837

1851

1866

Frequency (MHz)

Exposure (W/m²)

Frequency

(MHz)

Maximum

Exposure

(W/m²)

ICNIRP

Limit

(W/m²)

Frequency

Exposure

Quotient

1,867.200

6.229E-05

9.34

6.672E-06

1,871.800

4.548E-05

9.36

4.860E-06

1,851.000

2.967E-05

9.26

3.205E-06

1,853.400

5.421E-06

9.27

5.849E-07

1,849.000

1.551E-06

9.24

1.678E-07

1,872.000

5.728E-07

9.36

6.120E-08

1,867.000

5.179E-07

9.34

5.548E-08

1,867.400

4.213E-07

9.34

4.512E-08

1,871.600

3.960E-07

9.36

4.232E-08

1,869.000

3.765E-07

9.35

4.029E-08

Band Exposure Quotient :

1.610E-05

Total Band Exposure Quotient :

1.625E-05

Number of Frequencies Used in Quotient :

1128

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MEA-V1.1

Glossary

Location

:

The point at which the readings are taken. Each location is uniquely identified by its NGR coordinates and its timestamp. A

description of the location should be sufficient to allow the position to be identified at a later date.

NGR

:

The coordinates of the location. In this survey they must be specified using a 100km tile identifier followed by a 4-digit

easting and northing as defined in the Ordnance Survey National Grid Reference (NGR) system. N.B. This gives the

position of a location to 10 metre precision. E.g. TQ 3056 2184

Start Time

:

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

Antenna

:

The antenna device connected to the receiver. This is known by its serial number, type and manufacturer, and has an

associated calibration (see definition).

Calibration

:

A set of frequency (Hz) and K-factor (dB) pairs that define the gain characteristics of the antenna. Linear interpolation is

used to obtain K-factor values for intermediate frequencies.

Sweep Band

:

The measurements are taken at regular frequency intervals within a band of frequencies. A sweep band is defined by the

band title (which appears on each graph), start frequency, end frequency, frequency step, bandwidth and dwell time.

Exposure

:

This is the name given to the measured results. The maximum electric field strength values in decibel microvolts per metre

(dB(

μ

V/m)) are converted to power density in watts per square metre (W/m²).

Table Data

:

The 'Maximum Exposure' column consists of the ten highest exposure values in a band. Accompanying them are the

frequency at which the they occurred, the ICNIRP limit at that frequency (see definition), and the frequency exposure

quotient (see definition).

ICNIRP

:

International Commission for Non-Ionizing Radiation Protection

ICNIRP Limit

:

This is a guideline for the maximum permitted power density of non-ionizing radiation for public exposure.

The guideline is frequency dependent and is currently defined as:

Frequency

ICNIRP Limit

Less than 400MHz

2

W

/

m

²

400MHz to 2GHz

(f / 200)W/m², where f is frequency in MHz

2GHz to 300GHz

10 W/m²

Frequency Exposure Quotient

:

This is the ratio of the measured maximum electromagnetic power density to the ICNIRP limit at a given frequency. A value

close to 1 signifies that exposure levels could be near to the maximum permitted at that frequency.

Band Exposure Quotient

:

The sum of all the frequency exposure quotients in a band at a single location.

Total Band Exposure Quotient

:

The sum of all the frequency exposure quotients in all bands at a single location.

Power Density:

The energy flowing from an antenna through a unit area normal to the direction of propagation in a unit time. This is

measured in watts per square metre (W/m²).

G

S

M

:

Global System for Mobile communication

ETACS:

Extended Total Access Communications System

TETRA:

Terrestrial Trunked Radio

3G:

Third Generation mobile phone services

1.000E-06

Exponential (or scientific) number format. Equal to one millionth

1.000E-09

Equal to one thousand millionth

1.000E-12

Equal to one million millionth.

Page 8 of 8

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MEA-V1.1