Characteristics and Parameters of Land Mobile Service Units Necessary for EMC Analysis in Shared Frequency Bands: Analytical Survey

The analysis of frequency bands allocated among radio services in the Table of frequency allocations reveals that every band is utilized by several different radio services. The sharing of frequency bands by radio services requires that electromagnetic compatibility of the radio electronic equipment belonging to these services shouldbe ensured. Currently there is a rapid development of land mobile radio communication systems. There are concidered the basic parameters of radio transmitters and radio receivers belonging to ATP systems, which are necessary for the electromagnetic compatibility analyzing of such systems between themselves and with other systems sharing a certain frequency band. We can observe ways of using some characteristics.

Protection of Passive Bands in Australia, India, and Japan

ABSTRACTThe problems of protecting passive bands in Australia, India, and Japan reflect the variety of research activities and radio telescopes in those countries, colored by the degree of user friendliness of the frequency management authorities.In India, it is important to protect frequencies below 1400 MHz (for high redshift hydrogen line absorption or emission) and continuum bands at 327 MHz and 150 MHz (the latter currently allocated to cordless phones, paging systems, and rural communication).In Japan, protection from harmful interference has been sought and refused at 4.8 and 5 GHz (microwave network), 10 and 15 GHz (mobile relay service), and 22 GHz (mobile data relay service). But extensive radio astronomy usage of mm to sub-mm bands has established priority for their use and allocation.In Australia, there are major problems at 408 MHz (telephone links), 1.6 GHz (GLONASS, RDSS, and Land Mobile Service), 4.9 to 5 GHz (RDSS), and 22 GHz (satellite broadcasting and high definition TV service).The degree of user friendliness of the frequency management administration appears to rate: 1. Australia, 2. India, 3. Japan on a diminishing scale of cooperation and concern. This affects the awareness of the radio astronomy community of conflicting allocations and the level of input into CCIR and the WARC.