The 24/7 hydrophone station at Qaqqaliaq have now had its second month birthday and is still running. A very big Thank you goes to electronic wizard and opera lover Niels Christiansen Aarhus university-electronically workshop. Niels patiently helped and instructed and finally produced the first set of hydrophones that later were lost in the winter 2007-08 . He also soldered – printed diagrams- and so forth to repeat the whole procedure once more for the set of hydrophones we are now using. We now have a set of continuos recordings for more than 1500 hours except for a few fall outs when cables have been cut by ice. Specially the small red ground cable is vulnerable.
To verify the recordings we did set out on the evening of the 5 june to make bearing experiment and a intensity level calibration . Maja S was placed in a fixed and known position and the crew were told to make underwater sounds from the boat. A commercial calibrated hydrophone was then placed beside one of the fixed hydrophones and afterwards sensitivity can be compared. During the session Maja S was moved to different positions to verify the resolution on the bearings from the fixed array.
The whole evening ice was troubling us as small icebergs obstructed the line towards the ship or banged at the bottom to make a infernal noise. When we were ready to leave high tide had left us onshore unable to reach the dinghy and we had to wade in seawater to the belly button to get on board. Murphys law was working! But the sun was shining all night and the crew were incredible patient. Well onboard and treated with hot tea and honey mood was again high as we entered the harbour at 01 in the night.