Mobile Phone Base-Station Audit

Transcription

1 Baldock Radio Station Royston Road Baldock Herts SG7 6SH Mobile Phone Base-Station Audit Audit Site: Work Perfomed by St Edmunds Catholic School Nelson Road Twickenham Middlesex TW2 7BB Distribution List James Loughlin 3G measurements Lloyd Tailby Field Manager & Report Mrs R Murphy Mike Reynolds 3G measurements Field Officer JP JP 2G measurements Technical Manager T.I. Officer & 2G Report Case/Year file 2

2 The Office of Communications (Ofcom) took over the functions of the Radiocommunications Agency, the Independent Television Commission, and the Radio Authority (as well as the Office of Telecommunications and the Broadcasting Standards Commission) on 29 th December Ofcom is located at Riverside House, 2a Southwalk Bridge Road, London SE 9HA. Tel: Website: Baldock Radio Station forms part of the Operations Group of Ofcom. The station address remains at Royston Road, Baldock, Hertfordshire SG7 6SH. Tel: , Fax:

3 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. The Office of Communications (Ofcom), originally the Radiocommunications Agency performed this survey of the RF emission environment in the vicinity of the site of St Edmunds Catholic School on 4 th February Both second generation (2G) and third generation (3G) base station emissions were measured separately and the signal levels combined to calculate the Total Band as detailed below. The table, sorted in descending order of signal level, summarises the total results obtained at each measurement location. Summary of results: * 2G Band 3G Band Total Band Relationship to Location Limit Main Playground (North).29E E-06.30E-03 /772 Classroom 2K 6.95E-04.0E E-04 /243 Main Hall 2.4E E E-04 /309 Playing Field 2.25E-04 [note page 5] 2.25E-04 /4444 Main Playground (South).47E-04.6E-05.63E-04 /63 Year 6 Class.30E E-07.36E-05 /73435 Main Reception.04E E-08.05E-05 /95608 Area * Annex to this report 3

4 The site of the primary school was originally surveyed by a Technical Investigation Officer from the Kenley office on 3 October Since that survey a 3G base station has been installed at an existing base site close to St Edmunds Catholic School. The Operations group was tasked with re-auditing this site by Enforcement & Interference Policy Unit (EIPU) following a request from the school. Again the Kenley office carried out the second 2G audit, while mobile team 2 from Baldock completed a concurrent 3G survey. The results from both have been combined to provide the summary of results on page 3. At the school site the base station was scanned to ascertain the extent of 3G activity. A single transmission centred on 2.90GHz was recorded. At each location, this cell was scanned, a plot taken and the field strength measured. For each measurement the 3G exposure quotient has been calculated and added to the 2G exposure to provide the Total for each survey location. Within the classroom 2K a further 3G measurement was requested on the left hand side of the main window (see page 6). The results show a reduction of db from the readings recorded at the right hand side of the main window. This latter location (on the right side of the main window) had been used in both 2G audits and therefore has been included in conjunction with the 3G data to calculate the Total stated on page 3 for classroom 2K. All the 3G measurement data is given below, while the 2G data is contained in the annex to this report. Equipment Used Make Type Model Serial No. HP Spectrum analyzer 856A 284A007 EMCO DRG horn antenna Reynolds 2m cable

5 Location Fieldstrength Fieldstrength Fieldstrength Power Power 3G 3G 2G TOTAL Related to 3G + 2G MHz dbuv/m uv/m V/m W/m 2 W/m 2 W/m 2 Exp. Quot. limit Classroom 2K (RHS) , E E E-04 /243 TQ Main Hall , E E E-04 /309 TQ Main Playground North , E E-06.29E-03.30E-03 /772 TQ Main Playground South , E-05.47E-04.63E-04 /63 TQ Main Reception Area , E E-08.04E-05.05E-05 /95608 TQ Year 6 Class , E E-07.30E-05.36E-05 /73435 TQ Playing field - furthest [note ] 2.25E E-04 /4444 point from mast Note : The 3G measuring equipment requires mains power which is available from the laboratory vehicle. The state of the waterlogged playing field meant that the vehicle could not gain access to this location. This precluded a 3G measurement at the furthest location from the mast 5

6 Classroom 2K (Right hand side of main window) ATTEN 0dB RL 07.0dB V 0dB/ MKR 83.67dB V 2.370GHz Filename is Fe03030 D CENTER 2.400GHz SPAN 20.00MHz *RBW 2.0MHz VBW 3.0MHz *SWP.0sec Classroom 2K (Left hand side of main window) ATTEN 0dB RL 07.0dB V 0dB/ MKR 72.33dB V 2.370GHz Filename is Fe03038 D CENTER 2.400GHz SPAN 20.00MHz *RBW 2.0MHz VBW 3.0MHz *SWP.0sec 6

7 Main Hall ATTEN 0dB RL 07.0dB V 0dB/ MKR 82.33dB V 2.63GHz Filename is Fe03055 D CENTER 2.90GHz SPAN 20.00MHz *RBW 2.0MHz VBW 3.0MHz *SWP.0sec Main Playground (North) ATTEN 0dB RL 07.0dB V 0dB/ MKR 70.33dB V 2.290GHz Filename is Fe033 D CENTER 2.90GHz SPAN 20.00MHz *RBW 2.0MHz VBW 3.0MHz *SWP.0sec 7

8 Main Reception Area ATTEN 0dB RL 07.0dB V 0dB/ MKR 5.00dB V 2.227GHz Filename is Fe033 D CENTER 2.90GHz SPAN 20.00MHz *RBW 2.0MHz VBW 3.0MHz *SWP.0sec Year 6 Class ATTEN 0dB RL 07.0dB V 0dB/ MKR 6.7dB V 2.43GHz Filename is Fe0323 D CENTER 2.90GHz SPAN 20.00MHz *RBW 2.0MHz VBW 3.0MHz SWP 50ms 8

9 Main Playground (South) ATTEN 0dB RL 07.0dB V 0dB/ MKR 75.33dB V 2.367GHz Filename is Fe03242 D CENTER 2.90GHz SPAN 20.00MHz *RBW 2.0MHz VBW 3.0MHz *SWP.0sec Annex 9

10 This page left intentionally blank 0

11 2G Mobile Phone Base-Station Audit

12 Mobile Phone Base-Station Audit Audit site: St Edmunds Catholic School Nelson Road Twickenham Middlesex TW2 7BB In 2000 the Government asked the Radiocommunications Agency to implement 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 (). Ofcom took over the functions of the Radiocommunications Agency, along with those of the Independent Television Commission, Radio Authority, Oftel and Broadcasting standards Commission, on 29 December Electric field strength measurements made in various bands are referenced to and presented alongside the relevant 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. The green line on each graph indicates the guideline 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. Further explanation of the results and their context within the guidelines can be provided by the Ofcom officers at the time of the audit or by contacting Ofcom on , or by at contact@ofcom.org.uk. Results taken from all audit sites and further information on the audit programme can be found on the Ofcom website at 03 Feb 2004 Page of 0 MEA V..4

13 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 St Edmunds Catholic School on 3 February The following table, sorted in descending order of signal level, summarises the results obtained at each measurement location. Summary of results: Location Total Band Relationship to Limit MAIN PLAYGROUND NORTH.29E-03 /777 CLASSROOM 2K 6.95E-04 /439 MAIN HALL 2.4E-04 /448 FURTHEST POINT FROM MAST.PLAYING FEILD. 2.25E-04 /4450 MAIN PLAYGROUND SOUTH.47E-04 /6785 YEAR 6 CLASS.30E-05 /7767 MAIN RECEPTION AREA.04E-05 /95835 Issued on behalf of Ofcom. Issued by: Received by: JP Radiocommunications Specialist MRS RITA MURPHY HEAD TEACHER 03 Feb 2004 Page 2 of 0 MEA V..4

14 Site: Location: ST EDMUNDS CATHOLIC SCHOOL MAIN PLAYGROUND SOUTH Receiver: Manufacturer: ROHDE&SCHWARZ Model: EB200 Serial Number: /028 NGR: TQ Taken from GPS Start Time: 03 February :20:40 Officer: JP GSM E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Antenna: Manufacturer: Rohde & Schwarz Model: HE200 Serial Number: /09 Limit E E E E E E E E E E E E E E E E E E E E-07 Band : 5.79E-05 GSM 800 (lower) E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Limit, E E-05, E E-06, E E-07, E E-07, E E-07, E E-07, E E-08, E E-08, E E-09, E E-09 Band : 4.5E-05 GSM 800 (upper) E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Limit, E E-05, E E-05, E E-06, E E-06, E E-07, E E-07, E E-07, E E-07, E E-07, E E-07 Band : 4.80E-05 Total number of measurements: 572 Total Band :.47E Feb 2004 Page 3 of 0 MEA V..4

15 Site: Location: ST EDMUNDS CATHOLIC SCHOOL MAIN PLAYGROUND NORTH Receiver: Manufacturer: ROHDE&SCHWARZ Model: EB200 Serial Number: /028 NGR: TQ Taken from GPS Start Time: 03 February :38:0 Officer: JP GSM E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Antenna: Manufacturer: Rohde & Schwarz Model: HE200 Serial Number: /09 Limit E E E E E E E E E E E E E E E E E E E E-07 Band : 8.92E-04 GSM 800 (lower) E- 0 5 E- 0 7 E- 0 9 E (M Hz) Limit, E E-04, E E-05, E E-06, E E-06, E E-07, E E-07, E E-07, E E-08, E E-08, E E-08 Band : 2.55E-04 GSM 800 (upper) E- 0 5 E- 0 7 E- 0 9 E (M Hz) Limit, E E-05, E E-05, E E-05, E E-06, E E-06, E E-07, E E-07, E E-07, E E-07, E E-07 Band :.39E-04 Total number of measurements: 572 Total Band :.29E Feb 2004 Page 4 of 0 MEA V..4

16 Site: Location: ST EDMUNDS CATHOLIC SCHOOL MAIN HALL Receiver: Manufacturer: ROHDE&SCHWARZ Model: EB200 Serial Number: /028 NGR: TQ Taken from GPS Start Time: 03 February :52:49 Officer: JP GSM E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Antenna: Manufacturer: Rohde & Schwarz Model: HE200 Serial Number: /09 Limit E E E E E E E E E E E E E E E E E E E E-07 Band :.58E-04 GSM 800 (lower) E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Limit, E E-05, E E-06, E E-07, E E-07, E E-08, E E-08, E E-09, E E-09, E E-0, E E-0 Band :.63E-05 GSM 800 (upper) E- 0 5 E- 0 7 E- 0 9 E (M Hz) Limit, E E-05, E E-06, E E-06, E E-06, E E-07, E E-07, E E-07, E E-07, E E-07, E E-08 Band : 6.63E-05 Total number of measurements: 572 Total Band : 2.4E Feb 2004 Page 5 of 0 MEA V..4

17 Site: Location: ST EDMUNDS CATHOLIC SCHOOL CLASSROOM 2K Receiver: Manufacturer: ROHDE&SCHWARZ Model: EB200 Serial Number: /028 NGR: TQ Taken from GPS Start Time: 03 February 2004 :07:38 Officer: JP GSM E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Antenna: Manufacturer: Rohde & Schwarz Model: HE200 Serial Number: /09 Limit E E E E E E E E E E E E E E E E E E E E-07 Band : 3.6E-04 GSM 800 (lower) E- 0 5 E- 0 7 E- 0 9 E (M Hz) Limit, E E-04, E E-06, E E-06, E E-06, E E-06, E E-07, E E-07, E E-08, E E-08, E E-08 Band :.9E-04 GSM 800 (upper) E- 0 5 E- 0 7 E- 0 9 E (M Hz) Limit, E E-04, E E-05, E E-06, E E-06, E E-06, E E-06, E E-07, E E-07, E E-07, E E-07 Band :.43E-04 Total number of measurements: 572 Total Band : 6.95E Feb 2004 Page 6 of 0 MEA V..4

18 Site: Location: ST EDMUNDS CATHOLIC SCHOOL FURTHEST POINT FROM MAST.PLAYING FEILD. Receiver: Manufacturer: ROHDE&SCHWARZ Model: EB200 Serial Number: /028 NGR: TQ Taken from GPS Start Time: 03 February 2004 :3:02 Officer: JP GSM E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Antenna: Manufacturer: Rohde & Schwarz Model: HE200 Serial Number: /09 Limit E E E E E E E E E E E E E E E E E E E E-07 Band :.87E-04 GSM 800 (lower) E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Limit, E E-05, E E-06, E E-07, E E-07, E E-08, E E-08, E E-09, E E-09, E E-09, E E-09 Band : 2.02E-05 GSM 800 (upper) E- 0 5 E- 0 7 E- 0 9 E (M Hz) Limit, E E-05, E E-06, E E-06, E E-07, E E-07, E E-07, E E-07, E E-07, E E-08, E E-08 Band :.80E-05 Total number of measurements: 572 Total Band : 2.25E Feb 2004 Page 7 of 0 MEA V..4

19 Site: Location: ST EDMUNDS CATHOLIC SCHOOL YEAR 6 CLASS Receiver: Manufacturer: ROHDE&SCHWARZ Model: EB200 Serial Number: /028 NGR: TQ Taken from GPS Start Time: 03 February 2004 :55:44 Officer: JP GSM E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Antenna: Manufacturer: Rohde & Schwarz Model: HE200 Serial Number: /09 Limit E E E E E E E E E E E E E E E E E E E E-08 Band : 7.96E-06 GSM 800 (lower) E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Limit, E E-06, E E-07, E E-08, E E-08, E E-08, E E-09, E E-09, E E-09, E E-09, E E-09 Band :.66E-06 GSM 800 (upper) E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Limit, E E-06, E E-06, E E-07, E E-08, E E-08, E E-08, E E-08, E E-08, E E-09, E E-09 Band : 3.34E-06 Total number of measurements: 572 Total Band :.30E Feb 2004 Page 8 of 0 MEA V..4

20 Site: Location: ST EDMUNDS CATHOLIC SCHOOL MAIN RECEPTION AREA Receiver: Manufacturer: ROHDE&SCHWARZ Model: EB200 Serial Number: /028 NGR: TQ Taken from GPS Start Time: 03 February :2:24 Officer: JP GSM E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Antenna: Manufacturer: Rohde & Schwarz Model: HE200 Serial Number: /09 Limit E E E E E E E E E E E E E E E E E E E E-09 Band : 6.0E-06 GSM 800 (lower) E- 0 4 E- 0 6 E- 0 8 E- 0 E (M Hz) Limit, E E-07, E E-07, E E-08, E E-09, E E-09, E E-09, E E-09, E E-09, E E-09, E E-09 Band :.56E-06 GSM 800 (upper) E- 0 5 E- 0 7 E- 0 9 E (M Hz) Limit, E E-06, E E-07, E E-08, E E-08, E E-08, E E-08, E E-09, E E-09, E E-09, E E-09 Band : 2.78E-06 Total number of measurements: 572 Total Band :.04E Feb 2004 Page 9 of 0 MEA V..4

21 Glossary Site: Location: Band: NGR: GPS: Start Time: Officer: Receiver: Antenna: : The building or area around which sets of measurements are taken 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 A portion of the electromagnetic spectrum reserved for specific radio services The Ordnance Survey national grid reference coordinates of the location. In this survey NGRs are specified to 8-digit (0-metre) resolution. E.g. SJ The Global Positioning System The date and time at which the receiver started taking its measurements at a location The name of the Ofcomrepresentative who carried out the audit 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 Power Density: The electromagnetic energy flowing through a unit area normal to the direction of propagation in a unit time. Measured in Watts per square metre Limit: The reference level given by the International Commission for Non-Ionizing Radiation Protection () for general public exposure to electromagnetic fields limit 0MHz to 400 MHz 2 W/m² 400MHz to 2GHz f / 200 W/m² (where f is frequency in MHz) 2GHz to 300GHz 0 W/m² : The ratio of the measured maximum power density to the limit at a given frequency. A value close to signifies that exposure levels could be near to the limit for that frequency Band : The sum of the frequency exposure quotients for a single band at a location Total Band : The sum of the frequency exposure quotients for all of the measured bands at a location GSM: Global System for Mobile communication ETACS: Extended Total Access Communications TETRA: Terrestrial Trunked Radio 3G: Third Generation mobile-phone services.00e-03:.00e-06:.00e-09:.00e-2: Exponential (or scientific ) number format. Equal to one thousandth Equal to one millionth Equal to one thousand-millionth Equal to one million-millionth 03 Feb 2004 Page 0 of 0 MEA V..4