Services


The principals and associates of the firm have extensive experience in all aspects of telecommunications and electromagnetic engineering. The firm performs design work, government agency and license application engineering, preparation of specifications, construction supervision, propagation analysis, measurements, testing, and operation review of

  • Two-way Radio and Wireless Communication Systems
  • Communications and Radio Systems for FM and AM Broadcast
  • Closed-Circuit Video and Data
  • Microwave Systems
  • UHF and VHF Television Systems
  • Electromagnetic Engineering and Analysis
  • Electromagnetic Compatibility at Multi-user Communications Sites

The firm has a great deal of experience with the operational and logistical use of public safety agency communications systems, as well as the technical expertise required to provide radio system engineering analysis and design, system configuration alternatives, accurate cost analysis, and detailed design work, if required.

Over the course of many previous projects, we have provided clear and concise reports that present complex technical and regulatory issues both in summary form, suitable for non-technical readers, and in more detailed form, suitable for technical and engineering decision makers. We are accustomed to considering not only the technical details of a given system, but its operational characteristics as well. Often the operational needs of system users will have as much or more influence on system requirements and design than will more "technical" requirements such as coverage and capacity. Understanding how a system is used, where communication is required, what needs to be communicated, and who needs to communicate with whom are all critical to a complete needs analysis and to the proper technical evaluation of a radio system.

Summary examples of our qualifications

  • Our role as the consultant for the development of the King County Comprehensive Radio Plan provides a good example of our experience. The King County project included: a Needs Analysis, which cataloged the wireless communications needs of all County agencies; a Technology Assessment, which included technical characteristics and evaluation of all existing County radio systems, as well as a complete review of wireless technologies available to meet the County's needs; and a Regulatory Review, which addressed both broad regulatory issues common to all land mobile radio systems and specific regulatory issues related to the operation of radio systems in the Puget Sound region. During that project, we gained a great deal of familiarity with both the operational and technical characteristics of the King County Regional 800 MHz radio system, as well as the other radio systems used by County agencies and departments.
  • In other projects performed for agencies as diverse as the Washington State Patrol, Washington State Department of Transportation, Snohomish County, the City of Everett, Washington, and the State of Nevada, we have performed precisely the type of analysis required. Each of those projects included: a needs analysis; an evaluation of existing systems in terms of both operational and technical requirements (often including comparative coverage analysis); a comparison of system alternatives that considered technical, operational and cost issues (including capital and recurring costs); and a final report with specific recommendations.
  • In a study performed for the Washington State Legislative Transportation Committee, H&D analyzed the statewide radio communication needs of the Washington State Patrol and the Washington State Department of Transportation and made recommendations regarding potential consolidation of mobile radio and microwave interconnect facilities. The operational requirements of the two agencies, which were quite different, had a significant influence on the final recommendation to maintain separate and independent radio systems while sharing mountaintop base station and microwave relay facilities.
  • In studies performed for Snohomish County, Washington, H&D provided a comparison of the operational characteristics and system features provided by existing VHF mobile radio systems and by a proposed new 800 MHz trunked radio system. We also provided coverage maps showing the comparative coverage of the existing VHF system and the proposed 800 MHz system to show how coverage would be affected by moving from the existing system to the new system. In a separate study for the public safety and transit agencies in Snohomish County, we provided a detailed cost comparison between a combined transit/public safety 800 MHz system and two separate 800 MHz systems, one for transit and one for public safety.
  • For the City of Everett, Washington, H&D provided a complete needs analysis for all city radio users and evaluated a number of alternatives for providing increased capacity for all users. The analysis included an evaluation of the existing VHF systems used by the City, and a comparative coverage study that included coverage predictions for an expanded VHF system with new repeater sites and a county-wide 800 MHz trunked radio system. The study also included a comparative analysis of costs for each alternative.
  • For the State of Nevada, H&D evaluated all of the State's wireless communications needs, including broadband data communications and telephone interconnect circuits carried over a statewide microwave network. The project included operational, technical, and cost analyses of several alternative systems (including VHF and 800 MHz) designed to provide statewide public safety radio communications. An extensive series of comparative coverage maps was required to demonstrate statewide coverage for each alternative.

Our experience in radio propagation prediction is unparalleled. We use a wide range of propagation analysis tools. Additionally, we have experience with both predictions and measurements in the field that are required to select the propagation analysis techniques appropriate to a particular system or project.

We have in-house, state-of-the-art capability to prepare computer-generated maps for the prediction of radio coverage from actual or potential transmit/receive sites, as necessary to verify propagation coverage. Several propagation models are available to us for coverage predictions and microwave path analysis. Our capability includes delay studies for simulcast systems. We also have extensive in-house mapping capability.