Galina Mihaylova & Anton Ivanov

DX Windows

The IARU Band Plan is a globally accepted gentlemen’s agreement that is followed by 99% of radio amateurs.

The band plan contains several official DX windows in which there is an agreement to give full priority to long distance work (DX links).

DX shortwave windows

There are currently three such windows in IARU Region 1 (Europe, Africa, Middle East and North Asia) and seven in IARU Region 2 (North and South America).

DX windows in IARU Region 1:

3.500 – 3.510 kHz CW
3.775 – 3.800 kHz SSB
14.190 – 14.200 kHz SSB

DX windows in IARU Region 2:

1.830 – 1.840 kHz CW
1.840 – 1.850 kHz SSB
3.500 – 3.510 kHz CW
3.775 – 3.800 kHz SSB
7.000 – 7.025 kHz CW
7.175 – 7.200 kHz SSB
14.000 – 14.025 CW

DX windows on 80m: During the day these frequencies can be used for local traffic as there is no long distance traffic at this time. But we must be aware that even in the early afternoon local contacts in the DX windows can cause problems for stations that are 1000 to 2000 km in the direction of the terminator (the line that separates the dark hemisphere from the light hemisphere).

Example: 13:00 in Belgium in the middle of winter. It’s three hours before sunset. At this time it is impossible to work DX’s from Belgium. But the signals can be heard with very good strength in Scandinavia, only 1000 – 2000 km away, where the sunset is several hours earlier. Although we do not hear DX stations at this time, we can quite successfully QRM other stations that are much closer to sunset. Bottom line: stay away from these windows at all times, unless you’re trying to DX yourself.

When there are active DX-peditions, they have full priority in the use of the above-mentioned DX windows on 20 pt. In these circumstances, other stations should not use these windows and do so in the true spirit of the IARU gentlemen’s agreement. This window for DX-peditions on 20m was agreed in 2005 as a result of continuous problems caused by station IT9.

In addition to these official windows, there are other de facto windows:

Unofficial HF DX Windows:

The first 5 kHz of each band CW
1.830 – 1.835 kHz CW
1.845 kHz SSB
7.045 kHz SSB
14.020 – 14.030 kHz CW
14.080 kHz RTTY
14.190 -14.200 kHz SSB
18.075 kHz CW
18.145 kHz SSB
21.020 – 21.025 kHz CW
21.080 kHz RTTY
21.290 – 21.300 kHz SSB
24.895 kHz CW
28.020 – 28.025 kHz CW
28.080 kHz RTTY
28.490 – 28.500 kHz SSB

Avoid making local connections in these windows. They are frequency bands in which you can search for interesting DX stations.

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