275+ GHz

 

Considerations

WRC-2000 extended the mandate of the ITU Radio Regulations from 275 – 400 GHz to 275 – 1000 GHz but did not make any specific allocations to radiocommunication services. However, the conference revised a footnote listing bands above 275 GHz used by passive services that should be avoided by active radiocommunication services. In addition, WRC-2000 adopted preliminary agenda item 2.3 for WRC-07 to review studies and consider allocations in the frequency bands above 275 GHz. The 2002 ITU Plenipotentiary Conference extended the mandate of the ITU to allocate much higher frequencies and studies have begun on frequencies up to 375 THz.

In order to continue with their activities, the Amateur Services will require allocations of sufficient bandwidth to permit experimentation spaced throughout the range 275 – 1000 GHz. Studies of amateur services’ requirements in this range should be completed in preparation for WRC-10. The radio astronomy service has indicated a desire to share with the amateur services in this range.

The amateur services seek to obtain not less than 75 GHz of spectrum in the band 275 – 1000 GHz in order to provide for future development of the amateur services utilising new technologies.

Analysis of attenuation due to gasses and precipitation through the atmosphere indicates that the following bands are better choices than others for the amateur services.

Better bands
Attenuation
(GHz)
(dB/km)
275 – 300
6
355 – 400
10
490 – 510
10
690 - 710
50
800 - 850
50

The following are the bands preferred for the amateur and amateur-satellite services because they are within the better bands identified above and are free of other radio-frequency lines of the greatest importance to the radio astronomy service. Primary allocations within these bands appears feasible, and the bands from 510 GHz and below are the most ideal for the amateur services, based on atmospheric attenuation, and where the bulk of the allocations within these bands is preferred.

Preferred bands for the amateur services

(GHz)
Available bandwidth (GHz)
280 – 294
14
358 – 363
5
365 – 371
6
389 – 400
11
493 – 496
3
506 – 510
4
692 – 710
18
810 – 850
40

The ITU has begun studies of frequency bands above 3000 GHz (3 THz), considered the beginning of the optical spectrum.

Amateur experiments and records

W4WWQ and WA1ZMS/4 on 10 Dec 06 02:16Z

322 GHz RF QSO FSK slow CW with SSpectran software for decoding

distance 7.3 km temp -2 degree C, dewpoint -17 degree. rel hum 31% additional atmospheric attenuation 4.13 dB/km

403 GHz 1.4 km WA1ZMS/4 W4WWQ/4 CW 21 Dec 2004
411 GHz 0.05 km DB6NT/P DL1JIN/P SSB 06 Jan 1998

Status of allocations in Region 1

Germany has (an) amateur allocation(s) above 275 GHz (source DK2NH 24 feb 2007)