ARLA/CLUSTER: Existe um Mundo por descobrir na banda dos Terahertz entre 0, 1 THz e 10 THz

[João Costa > CT1FBF]

The Terahertz spectrum

Most radio amateurs are only active on the bottom 30 MHz of the entire
radio spectrum, which covers in total 300 000 MHz (300 GHz).

Fortunately, many amateurs also experimented on the VHF and UHF bands,
while only a few ventured to explore the SHF and EHF bands up to 241 GHz.

Radio astronomy, military, commercial stations either terrestrial or
satellite, as well as scientists have investigated and/or occupied
frequencies in the microwave spectrum.

The top end of Microwave radiation overlaps the bottom end of the Deep
infrared radiation, and for years nobody paid much attention to this
Terahertz gap that covers 0,1 THz to 10 THz until they stumbled on to the
unique properties of this submillimetre radiation.

It was with great difficulty that they first produced a few milliwatts of
power on Terahertz. Water vapour in the air normally limits communications
to about 10 metres, but it is not a problem in space or from the
high-altitude sites, such as the infrared telescope at Alma, Atacama, Peru.

Terahertz can see through walls and is a substitute for X-rays without its
radiation hazard, including many other uses. Radio amateurs have already
pioneered two-way contacts in Germany and the USA above 400 GHz up to a
maximum distance of 1,4 km.

During the World Radiocommunication Conference scheduled for 2019,
frequency bands will be allocated from 275 - 450 GHz to the different radio
services including amateur radio.

Fonte: The South African Radio League <http://www.sarl.org.za/Default.asp>
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