During the cruise, in the mid Atlantic, you want to get a weather update. Considering line-of-sight limitations, which frequencies should you use?
1. 3000 kHz
2. 10 000 kHz
3. 123.450 MHz (within the 118-136 MHz VHF range)
4. 126.900 MHz (within the 118-136 MHz VHF range)
The clue in the question is that you are mid ocean and have line of sight limitations. VOLMET can be on VHF or HF, but in this scenario, the pilot must use HF due to the range.
- 3000 kHz = 3 MHz
- 10 000 kHz = 10 MHz
Both are in the HF band, as shown below.
| FREQUENCY BAND | FREQUENCIES | WAVE BAND | WAVE LENGTH |
| VLF - Very Low Frequency | 3 – 30 kHz | Very Long | 100 km – 10 km |
| LF – Low Frequency | 30 – 300 kHz | Long | 10 km – 1 km |
| MF – Medium Frequency | 300 – 3000 kHz | Medium | 1 km – 100 m |
| HF – High Frequency | 3 – 30 MHz | Short | 100 m – 10 m |
| VHF – Very High Frequency | 30 – 300 MHz | Short | 10 m – 1 m |
| UHF – Ultra High Frequency | 300 – 3000 MHz | Ultra Short | 1 m - 10 cm |
| SHF – Super High Frequency | 3 – 30 GHz (3000 – 30 000 MHz) | Super Short | 10 cm – 1 cm |
| EHF – Extremely High Frequency | 30 – 300 GHz | Extremely Short | 1 cm – 1 mm |
Note: Always be careful with the units in these questions, the examiner may try to trick you with kHz, MHz etc.
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