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Home Downloads Magazines Ham Radio Magazine September 1968

Ham Radio Magazine September 1968

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S In case you don't know it, the frequency spectrum above 30 MHz is in serious trouble. Communications technology has outstripped our methods for controlling it and many har- ried users are clamoring for more space. The FCC has traditionally allocated blocks of fre- quencies to various users-in the vhf and uhf range they have taken advantage of line- of-sight propagation to allocate the same fre quencies to various sections of the country. However, with satellite communications, a new problem arises: since a single satellite signal blankets a large region, the same fre- quency can't be allocated in other areas. In the past, when a particular band of fre- quencies became too crowded, we simply improved our technology and moved higher in the spectrum. However, now the only higher bands lie in the region above 10,000 MHz. These frequencies are not too attrac- tive, even if we develop equipment to use them, because of high ic attenuation. A four year study sponsored by the IEEE and the EIA has recommended the allocation of space on the basis of need rather than the existing "block" approach. This is where the amateur frequencies are liable to be looked at very closely. Although our bands represent a small portion of the total spectrum between 30 and 960 MHz (about Solo), a complete overhaul may reduce this-particularly if the overhaul is based on use and need! Some of the other recommendations pro- posed for putting more transmitters into the same amount of space include: more "split- ting" to reduce the originally-assigned band- width to make room for other users, narrow- ing the 6-MHz now allowed for TV stations so that adjacent and in-between frequencies can be used for other purposes, and tighten- ing of standards for both receivers and trans.

 

 

 


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