In the LMR 200 series, we cover some of the more intricate system design criteria and include more emphasis on budgets and real-world situations. This information can be used by engineers new to the LMR field or with limited experienced, in order to learn the nuances of how to design systems while avoiding many of the pitfalls.
The series covers the following topics:
- Advantages and disadvantages of specific spectrum bands;
- Spectrum-management and efficiency discussion;
- Infrastructure decisions;
- Mobile and vehicular systems;
- Antenna system infrastructure;
- Importance of transmission lines;
- Radio coverage and interference;
- Licensing and spectrum efficiency;
- Advanced techniques for managing co-channel and adjacent channel interference;
- Close-spaced spectrum issues;
- New technologies, including data/CAD/location/video;
- Specifications management from a user perspective; and
- Project management techniques.
We welcome your feedback on these articles and also your suggestions on future topics.
Ira Wiesenfeld, P.E., is a consulting engineer who has been involved in the radio communications business since 1966. He is a senior member of the IEEE and has been a licensed amateur radio operator since 1963. He can be reached at firstname.lastname@example.org.
Robert C. Shapiro, P.E, is the senior manager-systems engineering for Cassidian Communications, an EADS Company. He serves on the TIA TR8 committee as TR8.18 vice chair and is a senior member of the IEEE. He can be reached at email@example.com.
Part 1: LMR in real-world applications
Part 2: Pros, cons of primary Part 90 spectrum bands
Part 3: Part 90 spectrum bands in real-world applications
Part 4: How smart technologies optimize radio performance
Part 5: Balancing uplink and downlink paths to improve system performance
Part 6: Maximizing use of radio frequency spectrum with antenna systems
Part 7: Don't overlook transmission lines
Part 8: Know the enemy
Part 9: Get cozy
Part 10: Non-voice communications grow
Part 11: A lot to consider
Part 12: Dealing with myriad LMR subsystems