PY4SM / PY2DD / ZW4SM

How did the band of 11 meters

Reproduction of this text is authorized provided the holder is preserved and mentioned - (Copyright : Marcus Martins - PY4SM / PY2DD)

In the year 1941 a ham that lived in Rhode Island (USA), overheard, reported at a frequency of 27.125 MHz. This frequency, the time was not released for use by radio amateurs and, moreover, because of the 2nd World War all hams were forbidden to pass. But this experienced trader noted that the language used in the transmissions was German.

The agency that regulated communications in the United States, to be notified by the amateur, said it was not a clandestine transmission within the American Territory. In fact the stations were Erwin Romel Marshal Troops transmitted Tunisia.

With the war over, the US communications coordinating body approved the development of low cost equipment for use by US citizens.

From the year 1947 US industry started production and marketing of the first equipment for the range of 11 meters. The main goal was to give the citizen a means of quick communication, versatile and cost-effective, without the need for technical expertise, targeting the professional and commercial activities.

Clandestinely in Brazil the expansion of this modality had a rapid development and soon the "Citizen's Band" was being used by a greater amount each day operators. The regulation of Citizen Radio Service took to happen and the Radio Technical Commission was the official organ at the time gave little importance to applications from all sectors of society. Brazil had signed the International Convention which recognized the range of 11 meters.

In 1970 came the decree No. 33 of 26 January 1970, the Ministry of Communications which regulated in our country, the Citizens Radio Service. Initially with only 23 channels and emissions only in AM (amplitude modulation) band of citizens was used by professionals and also for entertainment, much resembling the Amateur with distribution of commemorative diplomas and even Contests.

From 1979 onwards several changes were made to the Citizens Radio Service; the band now has 60 channels, commercial use, released for emergencies and permission for use of emissions in SSB was banned.