Stockholm Radio HF coverage

General rules

  • The higher the sun, the higher the frequency.
  • The lower the sun, the lower the frequency.
  • The longer the distance, the higher the frequency.
  • The shorter the distance, the lower the frequency.

HF radio conditions

Stockholmradio Service Area1/Green - Normally very good. 2/Yellow - Normally good. 3/Red - Occasional.

This chart displays Stockholmradio’s Approximate Service Area that can be expected under fairly normal conditions (see the green and yellow coloured eclipsed areas on the map above). Of course it is possible to establish contact outside this area but this is very much dependent on: the changing conditions in the ionosphere, the current radio conditions and also the pilot’s experience with using HF-radio. We can therefore not guarantee that communications will be viable with 100% readability at all times and we will not accept any liability for any inconvenience or cost caused thereby.

  • During night time the frequencies 3494 / 5541 / 8930 mainly cover areas 1, 2 and 3.
  • During day time the pilot must use the higher frequencies: 8930 / 11345 / 13342 / 17916 / 23210 in order to cover the same distance.

Propagation Forecast

Using the most appropriate HF radio frequency is crucial when establishing contact with Stockholmradio. The HF Propagation Forecast will help you choose the appropriate HF frequency given: the time of day/night, the atmospheric conditions and geographic location, by showing the most suitable HF frequency for communication with Stockholmradio.

You are free to reproduce Propagation Forecasts in full or in part to suit your own requirements. Propagation Forecasts are updated every three months and are available for download as PDF from this website. They may also be available from your navigation chart provider.

Hourly updated radio propagation forecasts for Stockholm Radio are also under available – see External Link Hourly radio propagation map these forecasts are produced by IPS Radio and Space Services in Australia, and they are based on real time ionosphere conditions.

Technical Hardware


  • 4 x 10 kW Collins channel transmitters with omni-directional antennas
  • 5 x 3 kW Collins fully synthesized Solid State transmitters

Transmitter antennas:

  • Seven fixed directional antennas plus one rotatable log-periodic


  • 6 x channel receivers
  • 6 x all-frequency receivers

Receiving antennas:

  • 9 x directional antennas.

  • In-house developed computer support using up-to-date Microsoft / Jboss Java solutions to cater for all operational requirements.
  • Quick and reliable connections to SITA, ARINC and AFTN networks as well as Email.
  • Quick access to MET data bases (Actuals and Forecasts).

Stockholmradio Antenna

Read more


STORadio Pilot Training

STORadio Guide

General terms and Conditions

External links


Hourly radio propagation map

Daily radio propagation map

Propagation forecasts

AUG – OCT 2018 PDF

NOV 2018 - JAN 2019PDF

Monitored Frequencies

3494/23210, 5541, 8930, 11345, 13342 and 17916 kHz
USB - Upper Side Band

Contact STO Radio



+46 (0)8 601 79 10

Other Products

AVIOLINX · P.O Box 1242 · 131 28 Nacka Strand, Sweden · +46 (0)8 601 79 00 ·