One should always avoid frequencies ending in a multiple of 10 for the
America's and 9 khz multiples for the rest of the world.
On Thu, Nov 20, 2025 at 9:25 PM Karel Matousek <ok1cf@atlas.cz> wrote:
> Hi,
>
> I would like to make a small suggestion regarding CQ calling practices on
> 160 meters. Many stations tend to call CQ exactly on whole-number
> frequencies, such as 1812.0 kHz, 1822.0 kHz, and similar. Unfortunately,
> these exact integer frequencies are often affected by various industrial
> noise products and spurious tones, which makes it very difficult to copy
> weak signals.
>
> A simple solution would be to move just a little off these whole-number
> frequencies—even 100 Hz up or down is usually enough to avoid the
> interference. This small shift can significantly improve the ability to
> hear weak stations.
>
> 73, DX Karel OK1CF
>
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