70 centimetres: Difference between revisions
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(Wrote 70cm summary section. More details on rigs would be useful.) |
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Propagation at UHF is primarily line-of-sight. However, [[tropospheric ducting]] can occasionally upport contacts over ranges of as much as 1500 to 3000 kilometres. [[Aurora]] and [[meteor scatter]] propagation have been observed, but are relatively rare and difficult to use. | Propagation at UHF is primarily line-of-sight. However, [[tropospheric ducting]] can occasionally upport contacts over ranges of as much as 1500 to 3000 kilometres. [[Aurora]] and [[meteor scatter]] propagation have been observed, but are relatively rare and difficult to use. | ||
==Australian 70cm bandplans == | |||
Revision as of 02:38, 1 July 2008
| Band: 70cm | |
| Bands | |
| 160m 80m 60m 40m 30m 20m 17m 15m 12m 10m 6m 4m 2m 1.25m 70cm 33cm 23cm 3cm | |
| Band Privileges | |
| US Extra | 420.000-450.000 |
| US Advanced | 420.000-450.000 |
| US General | 420.000-450.000 |
| US Technician | 420.000-450.000 |
| UK (all) | {{{UK}}} |
The 70 centimetre band is a popular UHF band.
Equipment
Single-band equipment for 70cm is rare, but many dual-band transceivers are available that operate on both 2 metres and 70cm. Available gear includes both mobile units and HTs.
Modulation
The most common mode is FM, but weak-signal operation using CW and SSB occurs at the lower end of the band. This is also the most popular band for Fast-Scan Television.
Propagation
Propagation at UHF is primarily line-of-sight. However, tropospheric ducting can occasionally upport contacts over ranges of as much as 1500 to 3000 kilometres. Aurora and meteor scatter propagation have been observed, but are relatively rare and difficult to use.