40 metres

From Amateur-radio-wiki
Jump to: navigation, search
Band: 40m
Bands
160m 80m 60m 40m 30m 20m 17m 15m 12m
10m 6m 4m 2m 1.25m 70cm 33cm 23cm 3cm
Band Privileges
US Extra 7.000-7.300
US Advanced 7.025-7.300
US General 7.025-7.125
7.175-7.300
US Technician 7.025-7.125 (CW only)
UK (all) 7.0-7.2 (7.1 up secondary)

A section of the 40 metre band shared with broadcast stations (7.1 to 7.2) was due to be cleared of broadcast stations on 29th March 2009. Frequencies above 7.2 MHz remain in use by broadcasters in many countries, causing potentially-severe interference to radioamateur stations operating in this range due to the relatively high effective radiated power in use by the shortwave AM broadcasters.

Equipment

Related wiki pages: Transceivers, Receivers, Radio/PC Interfaces

Most HF amateur transceivers support this and other commonly-used bands in the 160m - 10m range. Receivers intended for SWL use are typically able to tune these frequencies, although some will be unable to demodulate CW and SSB signals on the band due to lack of usable BFO.

Modulation

Related wiki pages: Modes

As with other HF bands, the lower portion of the band is CW and the remainder is primarily SSB, with some limited use of digital modes.

Propagation

Related wiki pages: Propagation

Stations in this band may be heard overseas and often worldwide, especially after sunset, due to skywave propagation.

Australian bandplan

Access: All licence classes

Vk4yeh vk 40m bandplan.jpg


Bands
HF and MF 160 metres * 80 metres* 60 metres * 40 metres * 30 metres * 20 metres * 17 metres * 15 metres * 12 metres * 10 metres
VHF 6 metres * 4 metres * 2 metres * 1.25 metres
UHF 70 centimetres * 33 centimetres * 23 centimetres * 13 centimetres
Microwave 9 centimetres * 6 centimetres * 3 centimetres * 1.25 centimetres * Bands above 24GHz
See also US bandplan