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VORs are assigned radio channels between 108.0 MHz and 117.95 MHz. How many channels are in-between? I guess that each decimal value represents 1 channel? for instance (108.1)(108.2)(108.3)(108.4)......(117.94)(117.95).

Sorry If my question looks dumb, I'm not professional but student.

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3 Answers 3

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As shown by this Source:

VOR are exploited over the Very High Frequency (VHF) band from 108 to 117.95 MHz with channels spaced of 50 or 100 kHz (50 kHz for dense zones, 100 kHz elsewhere). The first 4 MHz is shared with the ILS (Instrument Landing System) band, the VOR being allocated to 160 of the 200 available channels. To leave channels for the ILS, in the range 108.0 to 111.95 MHz, the 100 kHz digit is always even. Of these 160 channels, 120 are allocated to VOR stations intended for en route navigation while the other forty are for terminal VOR stations.

(emphasis is mine)

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  • $\begingroup$ Is it possible to have more than 200 channels? $\endgroup$
    – knowledgeloverx
    Commented Dec 5, 2022 at 2:41
  • $\begingroup$ @knowledgeloverx Based on the existing frequency allocation program for VOR stations and Localizer channels in the U.S., I don't think so. $\endgroup$
    – user22445
    Commented Dec 5, 2022 at 3:20
  • $\begingroup$ thank you for responses $\endgroup$
    – knowledgeloverx
    Commented Dec 5, 2022 at 3:48
  • $\begingroup$ @knowledgeloverx The system as it is today is designed with 160 channels. It would be possible to change the system to a different system that has more channels, but that would probably be extremely difficult in practice. $\endgroup$
    – Sophie Swett
    Commented Dec 5, 2022 at 10:43
  • $\begingroup$ The channels are reused when the transmitters are far enough apart to ensure there can be no interference, so 160 usable channels are enough to cover the entire planet. $\endgroup$
    – Paul Smith
    Commented Dec 5, 2022 at 23:15
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VORs are assigned frequencies with 50kHz (or 0.05MHz spacing, if you prefer). Thus, there are 200 possible frequencies.

(In the US, 40 of those frequencies are reserved for ILS, so the total number of available VOR frequencies in the US is 160.)

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From Wikipedia:

VORs are assigned radio channels between 108.0 MHz and 117.95 MHz (with 50 kHz spacing);

This means the lowest channel is 108.0MHz, the next one up is 108.05MHz, and so on.

This gives (117.95-108.8)/0.05 + 1 channels, or 200.

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