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  • devolved
    replied
    There is legislation is Australia with regards to frequencies used and the power that can be used with them.

    All AM frequencies are '9' apart - eg: 1098 / 1107 / 1116 - The first being 6MD Merredin, the latter 6MM Mandurah, but given the prevelance of AM 'splatter', you won't find many next to each other. Also most WA AM stations put out 2kw as opposed to 5kw over the east. Apparently the earlier licences were 5k but the later ones were 2k. Also depends on the official coverage area and terrain. AM radio can also 'bounce' off the ionosphere so there's extra incentive to keep them apart.

    FM is 'line of sight', so it's distance is more limited. Hence why you can have a million low powered 88 FM tourist radio stations everywhere.

    There is a comprehensive list of stations in Australia here: List of radio stations in Australia - Wikipedia, the free encyclopedia

    Here's an interesting chat about much the same thing in the US: What's the most commonly used FM radio frequency in the US? - Straight Dope Message Board

    The Department of Communications handles things like frequencies and delegation (I believe), here is there site: Radio | Department of Communications

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  • Nero Diablo
    replied
    Originally posted by ripper1199 View Post
    I have encountered the same frequencies for radio stations around the world. 92.9 Mhz seems to be used often and so is 96.7. Some I don´t think I have ever seen.
    Coincidence, me just remembering them and forgetting about the others or is there a technical reason that these frequencies are more often used then others?
    In Australia the broadcasting frequencies are controlled by a federal Govt Body ACMA. But a number of factors come into things the majority is around what other people are doing on other frequencies and harmonics of other frequencies.

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  • Visitor
    replied
    Information gathered from Wiki in 5 minutes:

    - Throughout the world, the FM broadcast band falls within the VHF part of the radio spectrum. Usually 87.5 to 108.0 MHz is used,[1] or some portion thereof, with few exceptions.

    - Assigned frequencies are at intervals of 30 kHz

    - However, to minimise cross-channel interference, stations operating from the same or geographically close transmitters tend to keep to at least a 0.5 MHz frequency separation even when closer spacing is technically permitted, with closer tunings reserved for more distantly spaced transmitters as potentially interfering signals are already more attenuated and so have less effect on neighbouring frequencies.

    Throwing this in excel quickly:
    87.5, 87.8, 88.1, 88.4, 88.7, 89, 89.3, 89.6, 89.9, 90.2, 90.5, 90.8, 91.1, 91.4, 91.7, 92, 92.3, 92.6, 92.9, 93.2, 93.5, 93.8, 94.1, 94.4, 94.7, 95, 95.3, 95.6, 95.9, 96.2, 96.5, 96.8, 97.1, 97.4, 97.7, 98, 98.3, 98.6, 98.9, 99.2, 9.5, 99.8, 100.1, 100.4, 100.7, 101, 101.3, 101.6, 101.9, 102.2, 102.5, 102.8, 103.1, 103.4, 103.7, 104, 104.3, 104.6, 104.9, 105.2, 105.5, 105.8, 106.1, 106.4, 106.7, 107, 107.3, 107.6, 107.9, 108.2

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  • Para045
    replied
    So how frequently do you check these frequencies to notice they are frequently the same

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  • ripper1199
    started a topic Radio frequencies

    Radio frequencies

    I have encountered the same frequencies for radio stations around the world. 92.9 Mhz seems to be used often and so is 96.7. Some I don´t think I have ever seen.
    Coincidence, me just remembering them and forgetting about the others or is there a technical reason that these frequencies are more often used then others?
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