1. Telecom Consultants International UHF2 Band Reversal Study Presented by Dr. Richard Dewey

2. Telecom Consultants International TCI041D003-1.0 2 TCI brief from the RA n Assess proposed band reversal strategy n Establish mathematical model for strategy n Estimate cost for implementing strategy

3. Telecom Consultants International TCI041D003-1.0 3 Mathematical model n REQUIRES –Accurate Rules database –Engineering procedures for implementing change strategy

4. Telecom Consultants International TCI041D003-1.0 4 Modus Operandi n The proposal suggested using Birmingham as a suitable place where both communal and single channel sites could be found. n In the event the Hog’s Back and Heathrow Airport were used

5. Telecom Consultants International TCI041D003-1.0 5 Hog’s Back n Chosen as typical communal site n Immediately showed deficiencies in the Rules database. (NGR and antenna height anomalies) n Intermodulation Products not excessive n UHF2 traffic too light to make useful measurements

6. Telecom Consultants International TCI041D003-1.0 6 Hogs Back Radio Site

7. Telecom Consultants International TCI041D003-1.0 7 Heathrow n Site Survey limited to Terminal 3 n Measurements difficult due to the high noise floor and lack of resolution of the spectrum analyser n Off airport monitoring equipment gives more accurate results n Rules database inaccuracies noted

8. Telecom Consultants International TCI041D003-1.0 8

9. Telecom Consultants International TCI041D003-1.0 9 Terminal 3 Short Term Car Park (North Lift Shaft)

10. Telecom Consultants International TCI041D003-1.0 10 Existing frequency assignments around Heathrow

11. Telecom Consultants International TCI041D003-1.0 11 Simplified UHF2 Spectrum Diagram for the Heathrow Area

12. Telecom Consultants International TCI041D003-1.0 12 Free space coupling between stacked dipoles

13. Telecom Consultants International TCI041D003-1.0 13 A Possible Solution for difficult sites Tx Antenna Rx Antenna At least 50 metres This arrangement is temporary for use during the changeover period but could become permanent if the site were to be managed by a third party.

14. Telecom Consultants International TCI041D003-1.0 14 Interference Analysis n An interference analysis was conducted and the following conclusion reached: At least 500 metres separation is required between sites to minimise the effects of blocking and wideband noise causing desensitisation

15. Telecom Consultants International TCI041D003-1.0 15 An Automatic means of Reassigning Frequencies n Use a relational database such as MS Access n Filter out all sites greater than 500m apart n Isolate whether they are communal or single user

16. Telecom Consultants International TCI041D003-1.0 16 Automatic Reassignment n See example: Appendix 7 of Report

17. Telecom Consultants International TCI041D003-1.0 17CONCLUSION n Despite identified deficiencies in the Rules database..... n A procedure for automatic frequency reassignment has been identified and is documented in the TCI report.

18. Telecom Consultants International TCI041D003-1.0 18 Future Work n A pilot project should be commissioned to determine the number of licensees who can be reassigned without recourse to special measures. n Further site work should take place at Heathrow to determine the noise floor so that a viable cost effective changeover strategy can be developed for the site.

19. Telecom Consultants International TCI041D003-1.0 19 Future Work cont. n The question of who pays for special equipment to aid the process should be addressed. n A detailed questionnaire should be sent to licence holders to determine what costs they are going to incur. The replies will need careful scrutiny as it is likely that such costs may be inflated in order to avoid the disruption.