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The '40 meters' or '7 MHz' band is a core amateur radio frequency band, spanning 7000 to 7300 kilohertz, allocated to radio amateurs in all countries worldwide. One of the five original shortwave bands allocated to amateurs in 1926, 40 meters is considered the most reliable all-season DX band, most useful for inter-continental communication at night. It is extremely useful for short to medium distance contacts from local contacts out to a range of 500–1500 km, depending on conditions, during the day. In higher latitudes, daytime inter-continental communication is also possible in winter, for example a good path often opens between Japan and northern Europe in the hours leading up to European midday from late November until late January, with a long path opening to the west coast of the United States and Canada after midday.
For many years the portion of the band from 7100-7300 kilohertz has been allocated to short wave broadcasters outside the Americas and not available to radio amateurs outside ITU Region 2. At the World Radio Conference WRC-03 in 2003 it was agreed that the broadcast stations would move out of the section 7100-7200 kiloherz on 29th March 2009 and that portion would become a worldwide exclusive amateur allocation afterwards. Discussions on releasing the remaining 100 kHz of the band to amateurs at a later date will continue in future conferences. Several European countries have now allowed amateur communication in the 7100-7200 kilohertz section on a shared non-interference basis as an interim measure.
Due to the 24 hour nature of the band, the wide variety of ranges that can be spanned with it, and its shared nature, it tends to be extremely crowded, and interference from other amateurs and broadcasters can be a serious limiting factor. In addition, amateurs in east and south-east Asia have suffered severe interference from illegal users in recent years.
With its unique combination of intra- and inter-continental communications possibilities, 40 meters is considered a key band in building a winning shortwave contesting score, especially in the lower part of the sunspot cycle.
Shortwave bands
★ ARRLWeb: US Amateur Bands
★ ARRLWeb: ARRL Band Plans
★ UK Amateur Radio Bandplans Band Plans
★ Ham Radio QRP
★ IARU Region 1 Bandplan
★ IARU Region 2 Bandplan
★ IARU Region 3 Bandplan
For many years the portion of the band from 7100-7300 kilohertz has been allocated to short wave broadcasters outside the Americas and not available to radio amateurs outside ITU Region 2. At the World Radio Conference WRC-03 in 2003 it was agreed that the broadcast stations would move out of the section 7100-7200 kiloherz on 29th March 2009 and that portion would become a worldwide exclusive amateur allocation afterwards. Discussions on releasing the remaining 100 kHz of the band to amateurs at a later date will continue in future conferences. Several European countries have now allowed amateur communication in the 7100-7200 kilohertz section on a shared non-interference basis as an interim measure.
Due to the 24 hour nature of the band, the wide variety of ranges that can be spanned with it, and its shared nature, it tends to be extremely crowded, and interference from other amateurs and broadcasters can be a serious limiting factor. In addition, amateurs in east and south-east Asia have suffered severe interference from illegal users in recent years.
With its unique combination of intra- and inter-continental communications possibilities, 40 meters is considered a key band in building a winning shortwave contesting score, especially in the lower part of the sunspot cycle.
| Contents |
| Summary |
| Frequency allocation |
| Japan |
| United Kingdom |
| United States |
| Key |
| Band plan |
| United States |
| See also |
| References |
Summary
Frequency allocation
Japan
| License class | 7.000 – 7.025 | 7.030 – 7.100 | |
|---|---|---|---|
| All classes |
United Kingdom
| License class | 7.000 – 7.035 | 7.045 – 7.200 | ||
|---|---|---|---|---|
| All classes |
United States
| US License Class | 7.000 – 7.025 | 7.025 – 7.125 | 7.125 – 7.175 | 7.175 – 7.300 |
|---|---|---|---|---|
| Novice / Technician | ||||
| General | ||||
| Advanced | ||||
| Extra |
Key
| = CW, RTTY and data (US: < 1 kHz bandwidth) | |
| = CW, RTTY, data, MCW, test, phone and image | |
| = CW, phone and image | |
| = CW and SSB phone | |
| = CW, RTTY, data, phone and image | |
| = CW only (US Novice/Technician: 200 W PEP maximum TPO |
Band plan
United States
| 7.035 | CW QRP calling frequency (QRP-L) |
| 7.040 | RTTY DX & CW QRP calling frequency |
| 7.080-7.100 | RTTY |
| 7.110 | CW QRP calling frequency (Novice) |
| 7.112 | CW QRP calling frequency (NorCal crystals) |
| 7.171 | SSTV |
| 7.285 | SSB QRP calling frequency |
| 7.290 | AM calling frequency |
See also
Shortwave bands
References
★ ARRLWeb: US Amateur Bands
★ ARRLWeb: ARRL Band Plans
★ UK Amateur Radio Bandplans Band Plans
★ Ham Radio QRP
★ IARU Region 1 Bandplan
★ IARU Region 2 Bandplan
★ IARU Region 3 Bandplan
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