Mobile cellular telephone systems are today universally used throughout the developed world. The key issue in many locations however is the lack of good coverage. In some cases this is caused by topographical features of the geography of the area or the lack of cellular telephone masts near by. However in other cases coverage may be good for some users of one operator but very bad for another. It may also happen that black spots exist even when no topographical feature would seem to be present to cause it or that strong signals are indicated but calls drop for no apparent reason. These situations are a strong indication of radio interference sources cause problems.
To resolve such problems is a challenge for Radio Frequency Engineers. First it is necessary to fully understand the radio technology in use and how signals are encoded, decoded and engineered in fully working systems. Coverage will be affected by antennas and the coverage expected for different types of antenna systems must be understood. With this knowledge and good spectrum analyzers it is possible to examine radio signals in locations where interference is expected and identify the type of interference. Different types of interference exhibit different signal patters and from this experienced technicians can start to locate suspected interference sources.
This course provides an understanding of radio systems in the 850, 900, 1800 (PCS) and 2100 MHz bands used for cellular and mobile telephony and in the 2400 MHz used for WiFi systems. Students will use simple laptop computers, regular cell phones and Spectrum Analyzers to understand RF interference, expected antenna propagation and the patterns generated by interference sources on tester displays. They will use directional antennas to track interference and learn how to locate individual interference sources.
Students Will Learn: