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OH7M is anew2x1call issued to:
Radioteam Soisalo ry


OH7M history in brief:
OH7M has been taking a part to major (minor too) HF-contests in past ten years, previously with calls OH7NTM, OH7AAC,OH7W, OH7X, OH7M AND OI7T. Some members of OH7AAC founded a contest team in 1993 and started to build a contest QTH about 25 km east from city Varkaus,which is located about 300 km north-east from city Helsinki, Capital of Finland. Contest QTH is located at Timo's OH7MS farm so we have had plenty of space to put up some rather big antenna constructions. At  summer 1993 we started with putting up our  42 meter high full rotating tower and took a part to SAC with calls OH7MS (MS-cathegory) and OH7WV (15 meter single by Esa). During 1993 SAC the constructions were not ready and we did not have our 40 meter yagi up yet. Before CQWW we put up one more rotating tower, a 36 meter high tower  made by Markku, OH7MCA with help of Ari, OH6LNI. First CQWW SSB from this new location with quite good antenna setup was enjoyable even it was just a start..

At summer -94 ( it was  the hot one..) we spend building a 48 meter  tower  300 m away from shack. We put up 160 meter five element sloper group and some multiplier antennas to 160-10 meters. 1995 summer we enlarged  hamshack and did  not do any big antenna installations. -96 we had very severe winter and it broke down our 40 yagi,fix that one in May. 1997 we stacked our 40 m 3-el yagi with 2 el cushcraft copy and build also a vertical beam for 80 meters. 1998 fall(september/november) we put up a new full rotating tower for 40meters with two 3 element full size stacked yagis.1999 fall we have fixed 15 meter top antenna as well as old 40 meter yagi. So mostly we have been repairing antennas..Old truth: If the beam ain't broken, it has too short boom...

All the antennas are homebrew (except two TH6), designed and assembled by Ari, OH6LNI. Besides of antenna / tower hardware we made many of electronics by ourselves, like : Power spiltter, beverage control, 80 meter array control, several remote switches etc. Most of the are made by Ari OH7MHL who has been our electronics guru. OH7WV has also made some great homebrew linear amps (Esukka 1000 and 2000 hi hi..)

                                     So if you are intrested  in to know more carry on..


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