About Radio Orienteering

What do you get if you combine handling radio equipment, running (or walking) in the beautiful Swedish nature, and solving a shortest-route problem? It is radio orienteering and in Gothenburg, the local name is Göteborgs Rävjägare (GRJ). All you have is a radio receiver, a map and a compass. Your task is to find radio transmitters hidden in the forest. See https://en.m.wikipedia.org/wiki/Radio_orienteering and https://pejla.se/ for further information.

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

Hisingsparken 2019

Ingvar waiting for Aurel, meanwhile can you spot the antenna?
Bearings from Erik S
Results of the hunt

It was a fantastic day with good weather and a very pleasing landscape of hisingsparken. It was great to see five participants and luckily I had maps for eight people 🙂

As an organizer of the event, I added a few new rules:

  • Wait for 1:30 hours before taking out the foxes after all hunters have been there: Erik S pointed out that this could be useful for those who experience frequency drift or moved their frequency knob involuntarily.
  • Subtract 1 minute from the final time for finding at least one plastic bag or object from the forest.

I am very happy that all the hunters found all the foxes. I heard they were well hidden in the natural formations provided by nature. Something very special about Göteborg RävJägare (GRJ) is that we do not put out the screens where the foxes are located. Unlike in the official events where an orienteering sign is put up.

It was fun to listen to the Morse coded hunter count while trying to guess who could be where during the hunt. Thinking about what strategies they could have used. The fun part for me is the above picture where the antenna that I put out for fox 4 came down when Ingvar took it down by mistake. There was still Aurel who had to take fox 4 so if you look closely at the above photo. The antenna is couple of meters above ground and laying horizontal going via another tree. Above Ingvar’s head (2m) is the top hook of the antenna as it horizontally travels left to the neighboring tree and finally reaches the left most bent tree where fox 4 was hidden between two small boulders. Aurel had two or so transmissions left before he could find the fox. He managed to find the antenna and trace it to find the fox 🙂

Ending ceremony: An eventful scoring as Robert’s puncher #4 did not record anything. I wonder if there was any chip inside it. Finally for the results, this Aurel’s first hunt to take all the foxes with his home made receiver. He was well applauded for his achievement 🙂 Erik S came in first. While the second place with plastics and a glass bottle was Erik A. The difference between them was more than 2 minutes. Luckily the plastics did not tip the final results as one minute was reduced from Erik A’s score but it nevertheless was a huge bonus for the environment with one plastic and a glass bottle less 🙂

The fastest route according to Erik S calculator is 4-3-1-5-2 with a distance of 2.6 kms. The calculator did not account for elevation or difficult path from fox 1 to fox 5 due to steep cliffs. Perhaps taking the tracks was more useful than fighting through the forest which probably was a deciding factor in the final outcome. But then you miss out on the beautiful secrets of the forest and kantareller 🙂

Next hunt, 22nd August, Änggårdsbergen organized by Aurel.

Cykeljakt resultat 20190613


View in OpenStreetMap via umap

It was a wonderful warm day. A colleague of mine dropped me off near the starting point along with my bicycle. To my surprise other orienteers had biked to the start. The map from the event organizer, David, was heart shaped and it did not fit on a A4 size. Probably more of a double A4 and an A5. Erik and Robert had the map fixed on the handle bar. While Ingvar and Tilak had it in their hand. As for the receiver, for Erik it hanging on his neck, while for Tilak it was hanging from the wrist. Others had their receivers on hand. The hunters were expected to finish at Fox#3. All the foxes were well highlighted with screens and well placed within biking paths.

With two minutes to start, Erik had gone invisible. It was later discovered that he started with Fox#2. While, Robert, Tilak and Ingvar started with Fox#4. From the final results, it looks like Robert went for the loudest reception. While others went for the convex-hull. It is interesting that the folks who took all the five foxes, went anti-clockwise. Going from fox#1 near Sankt Sigfridsplan to Östra sjukhus. This bicycle hunt was one of a kind.
Finally, Fox#3 was a delight as there was BBQ setup by David =) Bliss! A fantastic way to finish before summer =)



Påminnelse, radiopejlorientering på Flaskkullen i Västra Bodarna på torsdag 23 maj.

Hej, ni är välkomna på jakten torsdag 23 maj.

Jag kommer att sätta upp antenner för både 80m och 2m.
Plats: Flaskkullen, Västra Bodarna Koordinater: 57.86966, 12.46985

Samling: 18.00, Start: 18.28

Banläggare: Robert Petersson, SM6GHS, 0704 342740

Invitation for National Radio Orienteering (N1) in Göteborg 27-28 April 2019

GRJ har den stora glädjen att få inbjuda till N1 i Göteborg! Arrangemangetbestår av två tävlingar, på 144 resp. 3,5 MHz. De ger kvalificeringspoäng till det svenska laget vid EM i Slovenienoch tävlingsformatet liknar det som används vid internationella tävlingar. Tävlingsområdena ligger i centrala/södra Göteborg.

Invitation: https://pejla.se/results/res2019/n1/n1_inbjudan.pdf
PM: https://pejla.se/results/res2019/n1/n1_pm.pdf

Resultat Rävjakten 16/4 2019

Hej, har läst ut tider från rävarna:

Fick ute de tider för Frank på räv 1 och 2 som inte gick att få ur
puncher 12.  Ingvars sluttid var felskriven. Tabellen blir då med
uppdelning mellan 80m och 2m:

1. Ingvar  1:11:08   5 rävar
2. Erik A.  1:23:45   5 rävar
3. Frank    1:13:07  4 rävar
4. Aurel     1:21:10  3 rävar
5. Henrik   0:48:04  2 rävar

1. Tilak      0:56:51 5 rävar
2. Robert  1:04:13 5 rävar
3. Lars R.   1:11:19 5 rävar

Tack Bengt för en trevlig bana. Kul att vi blev 8 jägare i terrängen.