AM (MF) Radio
The design and specification of complex multi-tower directional antenna systems for Medium Frequency AM broadcasting operating between 525 kHz and 1705 kHz. Preparation of Technical Briefs and applications. Spectrum analysis and channel allocation studies. Analysis, review, modification, broadbanding and adjustments of AM antenna arrays. Design, planning and implementation of detuning systems for co-location or near location of cellular radio transmission facilities at AM antenna sites. Canada?s most experienced team of MF antenna system designers with a proven record involving the design, specification and field adjustment of hundreds of single and combined dual-frequency antenna systems ranging in power from 50 watts to 100,000 watts.

FM (VHF) Radio
The design and specification of single station and multi-station FM transmission facilities. Preparation of Technical Briefs and applications. Spectrum analysis and channel allocation studies. Canada?s most experienced team of antenna system designers with a proven record involving the design, specification and commissioning of hundreds of single and combined multi-station FM broadcasting transmission sites.

VHF and UHF Television (Analogue and Digital)
The design and specification of both omnidirectional and directional television transmission facilities. Preparation of Technical Briefs and applications. Spectrum analysis and channel allocation studies. The company has designed over 100 VHF and UHF transmission systems ranging in power from 1 watt to 1 megawatt.

MDS-TV Multipoint Television Distribution
The design, specification and commissioning of complex single and multi-frequency antenna systems and combiners for one way and two way MDS/ITFS communications systems operating on a point to point or point to multipoint basis in the 2 GHz band. Preparation of Technical Briefs and applications. Spectrum analysis and channel allocation studies.

Digital Radio Broadcasting
Digital Radio systems operating in the 1.4 GHz band are currently being planned for deployment as a replacement technology for the AM and FM distribution networks. We have provided Canada?s broadcasters with the design, specification, budgets and implementation framework for the multi-station cellular network necessary to provide seamless service to the most populated regions of Canada. We can assist all broadcasters with their planning and budgeting process leading towards the implementation of a DRB strategy.

Low Frequency Communication Systems
The design, specification and commissioning of complex single and multi-frequency antenna systems and combiners for Low Frequency Communication Systems operating between 100kHz and 523 kHz.

High Frequency Communication Systems
The design, specification and commissioning of complex single and multi-frequency antenna systems and combiners for high frequency communication systems operating between 2 MHz and 30 MHz.

VHF and UHF Radio Communication Links
The design and specification of radio communication links for broadcast and general communications purposes. Point-to-point and mobile systems have been implemented in the 150 MHz, 450 MHz, 950 MHz and 1.7 GHz bands. The company has significant experience in the analysis and implementation of systems with special requirements, over obstructed path and in congested spectrum applications. Systems have been designed and implemented include SCADA, telephone and special remote control and data acquisition networks.

Microwave Systems
The Design and specification of Microwave Systems across the Frequency band from 2 GHz to 23 GHz for point-to-point and broadband point to multi-point (MMDS) systems. The Company has designed and specified some of Canada's largest privately owned terrestrial microwave systems. The company's engineers are experienced in the use of both space and frequency diversity techniques and use the latest methods available for microwave path evaluation.

Millimeter Wave Systems
The company is in the forefront of proposal and development in the use of 28 GHz (and higher) frequency band for two-way interactive cellular communications system design, testing and implementation.

Signal and Coverage Analysis
The company will complete coverage and signal evaluation studies for new or existing broadcasting and communications facilities. RF propagation and signal coverage analysis for all broadcasting and communications frequency bands. Our wide experience in this field has led to the development of many special techniques for evaluation and analysis of special case path studies over obstructed paths and difficult terrain. With the latest in software and computer evaluation methods and terrain data bases, path analysis and propagation studies, including evaluation of existing facilities which have not achieved their desired coverage objectives can be undertaken.

Broadcast and Communication Site Design and Implementation
The company has been involved in many aspects of transmitter site design. The company has designed and supervised the construction of a number of major single and multi use, broadcast and communications transmission facilities. In addition to its own team of experts, the company has worked jointly with other professionals in this field to provide complete turnkey services.

Spectrum Management Studies
The use of the RF spectrum for broadcasting and communications requires a complex analysis of potential coverage areas integrated with the analysis of potential interference to other users of the band. D.E.M. Allen & Associates Ltd. has been involved in many aspects of RF spectrum allocation, assignment studies and planning to help achieve the best coverage consistent with meeting national and international interference and protection regulations.

RF Energy Studies and Surveys
Health and Welfare Canada, Safety Code 6 provides the guidelines for assessment of the "Limits of Human Exposure to Radiofrequency Electromagnetic Fields in the Frequency Range from 3 kHz to 300 GHz". Because of our involvement in many high power broadcasting sites in close proximity to major population centres, we have been at the forefront in the theoretical assessment and measurement of high density RF energy and determination of compliance with Safety Code 6.We are fully equipped to carry out calculations to predict levels of RF energy from existing or proposed transmitter sites and to carry out site measurement surveys in accordance with the exposure limit standards set by the appropriate regulatory authority.

Project Management, Communication and Testing
The Company has the expertise, field experience and equipment required to undertake the project management, commissioning, testing and evaluation of most broadcast and communications facilities.