About Radio Orienteering

Featured by ardfgoteborg, posted in Göteborgs RävJägare (GRJ), GRJ, Promotion
Quick Introduction to the ARDF sport – Radio Orienteering

What do you get if you combine a small hand-held radio equipment, running (or walking) in the beautiful Swedish nature, and solving a shortest-route problem? You get radio orienteering and in Gothenburg, the local name is Göteborgs Rävjägare (GRJ). Note that we do not hunt any fox (räv), it is just a name from the dinosaur era (1950s). We simply look for radio transmitters hidden in the landscape on a given map with the help of a compass and more importantly a radio receiver. The location of the transmitters are not provided on the radio-orienteering map, unlike regular-orienteering maps.

Your task is to find radio transmitters hidden in the forest. Usually there are five transmitters that takes turns transmitting a Morse signal with its identity while the other transmitters remain silent. See https://en.wikipedia.org/wiki/Radio_orienteering and https://pejla.se/ for further information.

All are welcome to contact us and try this sport. See About us / Contact us page for more details.

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Results from Härskogen, 80m Sprint, 21st April

by ardfgoteborg, posted in GRJ, Posts 2021, Results 2021

Thoughts and reflections from organizer Erik Sandwall:

Yesterday’s SPRINT hunt went partly OK, except for the fast number3 (fox number 8) which stopped transmitting. Or rather, it did probably send but nothing was coming out.  I suspect the cheap antenna banana plug. Let’s see if Robert can fix it.
I put out the two loops of transmitters (slow and fast) during the afternoon. First it was sunny and not so cold and then the temperature dropped and I had hail, rain and snow! Real April’s weather. At the time the hunters arrived, it was quite cold.
I separated the two loops of transmitters into two areas, with the start, finish and spectator beacon in the centre, around the parking at Härskogen. The event was following the international rules completely, which meant a starting sequence with 2 minute intervals. Most of the hunters kept warm by running around in the starting area (LSOK-stugan).
The slow foxes were located south of LSOK-stugan and the fast ones north of the parking. I had borrowed Roberts micro-fox and programmed it to send the letter S continously, as a spectator beacon. I made an extension to the antenna, and I think it was audiable over most of the area.At the start of the finish corridor I put the MO Hjälp-mig-hem beacon, and at the finish line I had the finish punching device.

It was great to see the hunters passing the S beacon, and all looked strong!

Radio orienteering April 7

by ardfgoteborg, posted in Events, Göteborgs RävJägare (GRJ), GRJ, Posts 2021

Welcome to the next radio orienteering event!

Time: Wednesday April 7, 2021, gathering 17:30, start 18:00, end 20:00

Start: Berghalla sporthall, Bergsjödalen 59, coordinates 57.7602 12.0777. Free parking on the roads Bergsjödalen and Ödegärdet. If you can, try to avoid public transportation, which may be full at this time.

Type: 3.579 MHz (80 m), 5 controls with flags, 2–3 km shortest route
Terrain: Mainly open forest with some footpaths, plenty of hills, and some marshes.

Practice: If there is interest, a basic introduction for newcomers will be given at 17:00. Please email if you wish to join this introduction. A transmitter mounted near the start will transmit continuously 17:00–17:58 for practice.

Organizer: Erik Agrell SM6-8406, phone 0761 191452

Resultat natt DM 2020

by ardfgoteborg, posted in DM, Göteborgs RävJägare (GRJ), GRJ, Posts 2020, Results 2020

Fantastic finish for the night radio orienteering. Thanks to banlaggare Erik Sandwall and the nice little cabin.

Probably a new record for the number of participants at 9 people. Thanks to Robert for bringing in folks. Perhaps, we should have additional bonus points for bringing a new person to this sport.

It was again a close finish with the map scale at 1:6000 and without the screens. Robert took the championship by 8 seconds. The second place was equally tight between Tilak and Albin, where Albin dived for the fox and Tilak dived for the plug a fraction later. Albin was a gentleman in saying that Tilak has the plug and let him punch the control. The difference in the recorded time between second  and third is 7 seconds.

Perhaps, the night hunts could be improved with the installation of orienteering screen so that the hunters don’t gather together at the same control,  waiting for the next  transmission. Perhaps some discussion points for the avslutningsfest.

It was good to see the old timers Ingvar and Lars R.