What he said.Please do. We love this stuff.
Hi folks,
Nothing cool to share, mediawise. We made it to Lyttleton. Everything is good. I understand once we got into warmer water the leak stopped. Most of the science party has left for home but we are staying until the next expedition starts. Details keep changing but currently it appears we will stay at berth until March 8th. On that day the other crew arrives, I have a couple days of crossover to do with my relief and then I take a long flight home on the 10th. Come back to Auckland May 1st and do it all over again. I'll continue to post pics and other stuff here if I find something interesting, at least until the end of exp.
I didn't think radio signals could travel underwater?Well we are back at the other site, the one the ice field chased us away from. I just found out that when we left that site we were not able to retrieve our beacon.
A little background on that. The JR, like many drillships, is equipped with an Automatic Station Keeping system (a.k.a. Dynamic Positioning). This ASK system keeps us in position over a drill site by controlling 12 individual thrusters and the two main shafts. The main method of station keeping is by way of GPS but for redundancy we always drop a radio beacon to the ocean floor. Before GPS, this was the main method to keep the ship on station. They are not cheap, about 10 grand per.
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So the beacon is about 4 foot long. It is attached to steel weights and is then dropped overboard. It sits on the ocean floor until we are finished and then we send a signal to it that trips a release mechanism and the beacon releases from the weights and floats to the surface where we retrieve it. At least that is how it is supposed to work.
For some reason, this beacon didn't release and we were forced to leave it. Once we got back on site, we went on a fishing trip. Check it out.
I didn't think radio signals could travel underwater?
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Apparently via VLF and ULF; also acoustically. When surfaced, with a regular radio.Well. How do submarines communicate while below the surface?
Yes, they also have a bouy cable that they can run to the surface.Apparently via VLF and ULF; also acoustically. When surfaced, with a regular radio.
I know nothing about this but this page is interesting.
Yes. But if you are listening to sounds under water it is sonar.So,
Radio?
I'm only familiar with ULF. It can transmit radio waves through the water, but it is really, really low bandwidth. Usually subs on any kind of mission pretty much keep transmissions to a minimum.So,
Radio?