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    Conditions for the spread of sq according to the season

    om0aaaFrom November 5, 2020 Updated: 23 September 2025 Uncommented 5 minutes of reading
    Headphones at radio stations
    Headphones at radio stations

    I have a chance to DX now QSO ? Oplatí sa mi volať na pásme „CQ DX'? And on which band? If you want to have some idea of ​​your options on radio amateur bands, or you are just planning tactics for an upcoming race, it pays to know what is happening in the ionosphere right now. The range table by season and frequency can also help.

    Typical spread during the spring and summer months
    Frequency kHz 4000 4000 8000 8000 12000 12000 15000 15000
    Hours after sunset Min Max Min Max Min Max Min Max
    1 80 400 300 1500 800 5500 1200 10000
    2 160 1000 400 2500 800 5500 1200 10000
    3 160 1000 400 3000 800 5500
    4 160 1280 400 4000
    5 160 1500 400 4000
    6 160 2500 650 5000
    7 160 2500 800 5500
    8 400 3000 1200 6500
    9 400 4000 1200 6500
    10 400 4000 1200 6500
    11 400 1500 800 4000
    Hours after sunrise Min Max Min Max Min Max Min Max
    1 160 800 650 3000
    2 0 160 650 3000
    3 0 160 400 2500
    4 0 160 400 2500 800 1500
    5 0 160 400 2500 800 2500
    6 0 160 400 2500 800 4000 1200 6500
    7 0 160 400 2500 800 5500 1200 6500
    8 0 160 400 2500 800 5500 1200 6500
    9 0 160 400 2500 800 5500 1200 6500
    10 0 160 400 2500 800 5500 1200 6500
    11 0 160 800 800 800 5500 1200 10000
    12 0 300 800 800 800 5500 1200 10000
    13 80 400 1200 1200 800 5500 1200 10000
    Directional antenna for 10m
    Directional antenna for 10m

    Typical spread during autumn and winter months
    Frequency kHz 4000 4000 8000 8000 12000 12000 15000 15000
    Hours after sunset Min Max Min Max Min Max Min Max
    1 160 1000 650 3000 800 5500 1200 10000
    2 160 1280 650 3000 800 6500 1200 10000
    3 160 1500 650 3000 800 6500
    4 160 1500 650 4000 800 6500
    5 160 1500 650 5000 800 6500
    6 160 2500 650 5500
    7 400 3000 650 6500
    8 400 4000 800 6500
    9 800 5000 800 6500
    10 800 6500 800 6500
    11 800 5000 1200 8000
    12 400 4000 1200 8000
    13 400 2500 800 4000
    Hours after sunrise Min Max Min Max Min Max Min Max
    1 160 1500 650 3000
    2 160 800 650 3000
    3 0 160 650 3000 5500 1200 6500
    4 0 160 650 3000 800 5500 1200 6500
    5 0 160 400 2500 800 5500 1200 6500
    6 0 160 400 2500 800 5500 1200 6500
    7 0 160 400 2500 800 6500 1200 8000
    8 0 160 400 2500 800 6500 1200 8000
    9 0 160 400 2500 800 6500 1200 10000
    10 0 160 400 1500 800 5500 1200 10000
    11 0 400 400 2500 800 5500 1200 10000

    You can read about the spread on sq, for example, in Milan OK1IF's article Chcete vyhrávat v contestech? Máte jen „pádlovku“? Jak si vybírat závodní kategorie? , OM4Q Monitoring of propagation conditions whether SW for propagation conditions on sq , How to measure antenna quality? a Disappointing forecast of propagation conditions

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