70 centimeters
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70 centimeters is a common amateur radio (ham) band in the UHF spectrum. The exact amateur frequency allocations varies regionally. In the US and Australia the band ranges from 420 to 450 MHz with some geographical limitations; in Canada, the band is only 430 - 450 MHz; in the UK, amateurs are allocated 430 - 440 MHz.
This band is popular with amateurs engaged in emergency communications where portable and mobile radios are frequently used. Often, hams have dual-band radios, capable of operation on both 70 centimeters and 2 meters.
[edit] Band Plan
Below is the ARRL US band plan for the 70 cm band:
| 420.00 - 426.00 MHz | Amateur TV repeater or simplex, and experimental |
| 426.00 - 432.00 MHz | Amateur TV simplex |
| 432.00 - 432.07 MHz | CW EME (Moonbounce) |
| 432.07 - 432.10 MHz | Weak-signal CW |
| 432.10 MHz | 70-cm calling frequency |
| 432.10 - 432.30 MHz |
Mixed-mode and weak-signal |
| 432.30 - 432.40 MHz | Propagation beacons |
| 432.40 - 433.00 MHz | Mixed-mode and weak-signal |
| 433.00 - 435.00 MHz | Auxiliary/repeater links |
| 435.00 - 438.00 MHz | Satellite only (internationally) |
| 438.00 - 444.00 MHz | ATV repeater input and repeater links |
| 442.00 - 445.00 MHz | Repeater inputs and outputs (local option) |
| 445.00 - 447.00 MHz | Shared by auxiliary and control links, repeaters and simplex (local option) |
| 446.00 MHz | National simplex frequency |
| 447.00 - 450.00 MHz | Repeater inputs and outputs (local option) |
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| Very high frequency (VHF) and Ultra high frequency (UHF) Amateur radio bands | |||||||
| VHF | UHF | ||||||
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| 6 m | 4 m | 2 m | 1.25 m | 70 cm | 33 cm | 23 cm | 13 cm |
| 50 MHz | 70 MHz | 144 MHz | 219-220 MHz | 420 MHz | 902 MHz | 1.24 GHz | 2.3-2.31 GHz |
| 54 MHz | 70.5 MHz | 148 MHz | 222-225 MHz | 450 MHz | 928 MHz | 1.3 GHz | 2.39-2.45 GHz |
