Mobile Phone Base-station Audit for Bedonwell Junior School

Mobile Phone Base-station Audit for Bedonwell Junior School

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Mobile Telephone Base-station Radio Emission AuditAUDIT SITE : BEDONWELL JUNIOR SCHOOLBEDONWELL ROADBELVEDEREKENTDA17 5PFThe Radiocommunications Agency (RA) is responsible for the management ofthe civil radio spectrum in the UK. The Government has asked the RA toimplement a national measurement programme to ensure that emissions fromcellular base stations do not exceed recommended guidelines.RA engineers measure the power density of transmissions in the various radiobands to be surveyed. The results, derived from electric field voltagemeasurements, are referenced to and presented alongside the relevantInternational Commission on Non-Ionizing Radiation Protection (ICNIRP)recommended public maximum exposure levels. On the left hand side of theresults page(s) is a graphical representation of the radio spectrum surveyed ateach location on the site. At the top of each graph a dotted green lineindicates the ICNIRP recommended exposure level for that frequency band.To the right hand side of each graph is a table showing the ten highest levelemissions recorded within a band. In addition to this report, results taken fromeach audit site will be posted on the RA website at www.radio.gov.uk wherefurther information on the audit can be found.Further explanation of the results and their context within ICNIRP guidelinescan be provided by the RA engineers at the time of the audit or by contactingthe RA on 020 7211 0211 or by e-mail at rfaudit@ra.gsi.gov.uk ...

Subjects

Informations

Published by
Reads 16
Language English
Report a problem
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 rfaudit@ra.gsi.gov.uk.
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
Page 7 of 8
27 Sep 2001
Printed:
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
27 Sep 2001
Printed:
MEA-V1.1