Mobile RF/EMC Lab - Team 3 RF Survey 3.4 GHz (Phase I) CS FWA Manchester
Radiocommunications Agency
Baldock Radio Station
Royston Road
Baldock
Hertfordshire
SG7 6SH
Assistance requested:
Tests carried out on:
Report issued on:
Revised:
6th February 2001
15, 16 and 20th Feb 2001
29th May 2001
23rd January 2003
Report Number: ML3-03-1
RF Survey of 3.4 GHz (Phase I) CS FWA Manchester
Work Performed by
Measurements and Report
Dave Sweeney. Field Team
1 Assistant
Measurements
Phil Dyson. FT 3 Assistant
Report Authorised
Eddie Bull. Operations
Manager
Distribution
Steve Jones RA2/PWN
1
Ricky Donnegan RA2/PWN
1
Case/year file
1/1
Eddie Bull RA3/Baldock
1
Page 1 of 7
Report: ML3 03-01
Mobile RF/EMC Lab - Team 3 RF Survey 3.4 GHz (Phase I) CS FWA Manchester
Report: ML3 03-01
Table of Contents
1.
INTRODUCTION .................................................................................................................................................... 3
2.
SITE CONTACTS .................................................................................................................................................... 3
3.
METHOD .................................................................................................................................................................. 4
3.1
DESCRIPTION...................................................................................................................................................... 4
3.2
SYSTEM CHARACTERISTICS ............................................................................................................................... 4
3.2.1
System gain at 3.4 GHz ............................................................................................................................... 4
3.2.2
Equipment list ......................................................................................................................................... 5
4.
RESULTS .................................................................................................................................................................. 6
4.1
SYSTEM NOISE FLOOR ........................................................................................................................................ 6
4.1.1
Pennine Way Hotel, Oldham....................................................................................................................... 6
4.1.2
Circle Court, Stretford ................................................................................................................................ 6
4.1.3
Stoford Council Offices, Stockport.............................................................................................................. 6
4.2
SATELLITE BEACON CHECKS ............................................................................................................................. 7
4.3
WEATHER CONDITIONS...................................................................................................................................... 7
4.4
RESULTS SUMMARY ........................................................................................................................................... 7
Page 2 of 7
Mobile RF/EMC Lab - Team 3 RF Survey 3.4 GHz (Phase I) CS FWA Manchester
1.
Report: ML3 03-01
Introduction
The Fixed and Mobile Monitoring and Measurement Section was tasked by RA2/PWNU to carry
out a RF survey in the 3.4 GHz bands allocated to Fixed Wireless Access. The Spectrum is to be
re-licensed and the survey is to confirm what if any threat signals exist in this band.
It was agreed that 3 roof top surveys would be carried out in cities nominated by RA2/PWNU.
These rooftop surveys are to represent Central Stations (CS).
Three roof top surveys were carried out in Manchester to represent FWA CS. No representative
Terminal Station (TS) (ground level) site surveys were required at Manchester as they are included
in an earlier report:
Report No.ML2 0019 RF Survey 3.4 GHz (Phase I) TS FWA Manchester
The frequency bands (Phase I) surveyed were:
3.425 - 3.442 GHz
3.476 - 3.493 GHz
Signals +6 dB from the system noise floor were logged. It was agreed with RA2/PWN that
monitored signals would be logged but not identified.
2.
Site contacts
2.1
The Pennine Way Hotel
Contact: Duty Manager, 0161 624 0555
NGR: SD 921 048
2.2
Circle Court,
Barton Road,
Stretford
Contact: Mr John Shelhorn
Tel: 0161 912 4335
Caretaker: Mr Dave Monks
Mobile: 07990 988590
Tel: 0161 747 8171
NGR: SD 777 756
2.3
Stockport Metropolitan City Council
Stoford
Piccadilly
Stockport
Contact: Mrs Pat Dargen
Tel: 0161 474 4062
NGR: SJ 896 900
Page 3 of 7
Mobile RF/EMC Lab - Team 3 RF Survey 3.4 GHz (Phase I) CS FWA Manchester
3.
Method
3.1
Description
Report: ML3 03-01
A tripod mounted horn antenna with a LNA was used to carry out the survey allowing a 360°
azimuth and 0° elevation survey to be carried out in 20° steps in both horizontal and then vertical
polarisation on the rooftop of each monitoring site. A spectrum analyser was used in clear write
and max hold modes (10 sweeps) in each antenna position. If a signal was found, its peak power
direction was determined and the trace was captured as a file onto computer. With the spectrum
analyser resolution bandwidth set to 100 kHz, signals +6 dB from the system noise floor are
included in this report.
Horn antenna +LNA
GPIB
Spectrum
Analyser
Feeder
3.2
System characteristics
3.2.1 System gain at 3.4 GHz
Flann standard gain horn 3.22 – 4.90 GHz
Locus Inc. LNA 3.4 – 4.2 GHz
Micro-Coax 6m ‘green’ cable
+18.7 dBi
+51.0 dB
-3.2 dB
System gain =
66.5 dB
Page 4 of 7
Mobile RF/EMC Lab - Team 3 RF Survey 3.4 GHz (Phase I) CS FWA Manchester
3.2.2
Report: ML3 03-01
Equipment list
Equipment type
HP spectrum analyser
Flann Microwave 3.22 –4.90
GHz standard gain horn
Locus Inc. LNA 3.4 – 4.2 GHz
Micro-Coax [6m]
Flann Microwave 9.84-15.0
GHz standard gain horn
L-TEQ 9.732-15.012GHz LNA
Rosenberger 5m cable (silver)
Model
8565E
11A240-20
Serial number
3611A0040
RF 3000-35-60B3
UFB 142A-1-2362-300310
17240-20
936
JSD00186
UTI-106-5000
564016
02K-08K-001
Page 5 of 7
198
Mobile RF/EMC Lab - Team 3 RF Survey 3.4 GHz (Phase I) CS FWA Manchester
4.
Results
4.1
System noise floor
Report: ML3 03-01
At each site, the average system noise power was measured with the spectrum analyser, both in
clear write and max hold modes. The following tables show calculated values based upon the
spectrum analyser average clear write measurements and data given in the System characteristics
section. The system sensitivity (dBm/100 kHz) is the calculated noise power that is developed at
the antenna output port.
4.1.1 Pennine Way Hotel, Oldham
Frequency band
/GHz
Average display
noise, single sweep
/dBm
Average display
noise, max hold
/dBm
System sensitivity
[dBm/100 kHz]
3.425 - 3.442
3.476 - 3.493
-56
-56
-52
-51
-103.8
-103.8
4.1.2 Circle Court, Stretford
Frequency band
/GHz
Average display
noise, single sweep
/dBm
Average display
noise, max hold
/dBm
System sensitivity
[dBm/100 kHz]
3.425 - 3.442
3.476 - 3.493
-56
-56
-53
-52
-103.8
-103.8
4.1.3 Stoford Council Offices, Stockport
Frequency band
/GHz
Average display
noise, single sweep
/dBm
Average display
noise, max hold
/dBm
System sensitivity
[dBm/100 kHz]
3.425 - 3.442
3.476 - 3.493
-56
-56
-53
-53
-103.8
-103.8
Page 6 of 7
Mobile RF/EMC Lab - Team 3 RF Survey 3.4 GHz (Phase I) CS FWA Manchester
4.2
Report: ML3 03-01
Satellite beacon checks
At each site, together with a check to ensure that the amplifier gave a rise in spectrum analyser
noise floor display, satellite telemetry beacons were measured as a system signal confidence check.
Location
Baldock
Pennine Way Hotel
Circle Court
Stoford Council Offices
4.3
Frequency/ GHz
3.95
Signal level/ dBm
-78 dBm
3.95
-78 dBm
3.95
-77 dBm
3.95
-79 dBm
Weather conditions
The table below gives weather conditions for the days of the survey.
Date of survey
15 February 2001
16 February 2001
20 February 2001
4.4
Weather conditions
Sunny, temp 8°C
Fog, temp 2°C
Overcast, temp 5°C
Results summary
No signals were detected in the 3.4 GHz band (Phase I) at any of the measurement locations. The
table below summarises the worst case (radiated) noise floor levels and interference levels for
Manchester:
3.4 GHz CS 100 kHz bandwidth
City
Manchester
Noise Floor dBm
Lower Band Upper
-117
-117
Interference H dBm
Lower Band Upper
-117
-117
Page 7 of 7
Interference V dBm
Lower Band Upper
-117
-117