Weather radars in Finland

Don’t use the same WiFi channel as the closest weather radar!

European weather radars use frequencies between 5,60 and 5,65 GHz. In WiFi parlance it means channels 120, 124 and 128. If a WiFi device detects a radar signal it will either change channel or go silent for a half an hour. Either way the connection will be dropped. Your safest bet is to avoid these channels. On the other hand, there are just ten weather radars in Finland and they are pretty far apart. Do you need to avoid a channel in use in Utajärvi if you are in Helsinki? No. Usually it suffices to avoid the frequency used by the nearest radar.

Don’t be surprised when the WiFi doesn’t appear immediately. New and recently upgraded access points will listen for ten minutes for radar signals on these channels. This doesn’t sound good, but on the other hand these channels have least traffic for the very same reason.

Here is the current (3/2017) list of frequencies:

Name

Established

Position
(WGS84)

Height
(AMSL)

Frequency
(MHz)

WiFi Channel

Anjalankoski

1994

60.9039N
27.1081E

139 m

5638

128

Ikaalinen

1994

61.7673 N
23.0764E

153 m

5644

128

Kesälahti

2014

61.9070N
29.7977E

174 m

5610

124

Korppoo

1997

60.1285N
21.6434E

61 m

5620

124

Kuopio

1995

62.8626N
27.3815E

268 m

5615

124

Luosto

2000

67.1391N
26.8969E

533 m

5618

124

Petäjävesi

2015

62.3045N
25.4401E

271 m

5628

124

Utajärvi

1997

64.7749N
26.3189E

118 m

5608

120

Vantaa

1994

60.2706N
24.8690E

82 m

5649

128

Vimpeli

2005

63.1048N
23.8209E

200 m

5639

128

This is an example of radar interference. The narrow, straight patch of ”rain” between Helsinki and Tallinn is a caused by a transmitter on channel 128. The transmitter is either in Tallinn or on the sea, because the the beam is so narrow. A transmitter closer by would cause a wider sector of interference.

Weather radar

2 thoughts on “Weather radars in Finland”

    1. I’d be glad to! Just drop me an email before you arrive: petri.riihikallio@metis.fi

      I haven’t applied yet. I’d need some endorsers but I don’t know any CWNEs. They are quite hard to find here in Finland…

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