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The VHF radio signal is basically a line-of-sight transmission. If you can’t see the receiving antenna from your location, you may not be able to communicate. The repeater receives your weak signal and rebroadcasts it at a higher power to the distant receiver. We place the equipment so that both the sender and receiver can see it even though they can’t see each other. This means selecting a location, usually on top of a mountain, that is visible to both parties. With this strategy a person with a low-power hand-held radio can be working in the Dry Valleys, some 70 miles from McMurdo, and talk through their repeater to MacOps. This electronic equipment had to be self-contained, able to withstand temperatures as low as –100 degrees Fahrenheit, and wind speeds up to 100 MPH. Back in Charleston, South Carolina, Bill Robertson a communications engineer with Naval Electronics Engineering Laboratory, designed an equipment package meeting these specifications. The module could be flown into remote locations. It consisted of a two-channel Motorola VHF radio, 6 car batteries, solar panels to charge the batteries, and had the ability to monitor and record wind-speed and air temperature. All of this was assembled onto an aluminum frame making the completed package look a lot like NASA’s Lunar Lander. The repeater weighed nearly 1200 pounds and we transported it by helicopter to selected sites. When I arrived at the helo hanger I found Steve already there. He said that we would get our flight briefing in a few minutes and we discussed the work we would perform on the repeater. It was a simple job, just checking the alignment of the transmitter and condition of the batteries. It should take us no more than an hour, but we had asked for two. We always tried to budget more time than necessary with the hope that we’d have some time left over to take photographs and enjoy the view. The weather had been fairly calm, but high clouds frequently dropped down to obscure the top two thirds of Mt. Erebus. This was right where our equipment was located and we’d been trying for nearly a week to get to the site only to find our flight canceled each day. Today was looking better though and we were excited to make the trip. When we got the go ahead for the flight we grabbed our gear and ran out to the helo that was warming up on the pad. Our aircraft was a UH-1N (Huey), twin-engine helicopter, flown by a Navy crew from Antarctic Development Squadron Six (VXE-6). The crew consisted of a pilot, copilot and crew chief. Steve and I were the only passengers on this trip, which was great, because we both got window seats for the 30-minute flight up the mountain. We put on our flight helmets, plugged into the comm system and settled back into the seats listening to the pilots get cleared for take off. The temperature outside was in the high 20s F. It wasn’t much warmer inside either. With a rumble, the engines ran up to speed and we lifted off the ground turning to the south and flew out over McMurdo Sound. Below us was open water. The U.S. Coast Guard Cutter, Polar Star, had cut a channel in the ice to provide a path for the fuel and supply ships into McMurdo. Several Killer Whales swam along the edge of the ice searching for penguins, one of their favorite meals. The aircraft banked to the north, passing around Hut Point and followed the edge of the peninsula toward our destination. On the ridge below us, a group of hikers were making their way along a trail to an ancient volcanic lava plug named Castle Rock. The rock sticks up about 300 feet above the ice and is a popular destination for folks who want to get out of McMurdo for a few hours. Ahead of us
is the Erebus Glacier Tongue. Ice from the glacier flows off the mountain
and out over the ocean. Around its base were a number of Weddell Seals.
In early October, this glacier is riddled with ice caves that are filled
with millions of beautiful ice-crystals hanging like stalagmites from the
ceiling. Each year the search and rescue team surveys a safe passage into
the caves for us to visit. By the end of November the caves begin to melt
and become too hazardous to enter. This landmark quickly passed below us
and soon we were climbing up the side of Erebus.
Steve popped the covers off the repeater and we began our work. The mountain was incredibly quiet. There were no sounds other than our breathing and a squeaking, crunching, sound from our boots as we walked on the snow. The view from this site was breathtaking. With an annual average of less than 2 inches of precipitation, this is a polar desert. The lack of humidity makes for some of the clearest air on the planet. You can routinely see more than 100 miles with crystal sharpness on those distant features. In just over an hour we had completed our alignments and closed the repeater doors. When I looked up I paused, not believing my eyes. We had been so intent on our work that neither of us noticed the clouds had descended. We could see about 200 feet and everything was white. It was impossible to distinguish the sky from the ground. Both blended together and it looked as if we were on the inside of a Ping-Pong ball. This wasn’t a good sign. With trepidation, I picked up the radio and called MacOps. I told them we were done with our work and ready to leave. There was a long pause and then they came back to tell us that, because of the weather, the helo would not be able to pick us up. We were told to make plans to stay on the mountain until conditions were better. This was not what I wanted to hear. We could be stuck up here for a week. This was supposed to be a quick in-and-out trip. I had even forgotten to bring the case for my contact lenses and had no desire to spend the night on this mountain. Steve felt the same way and the two of us simply sat on the rocks and looked at each other. You couldn’t walk anywhere. The only safe ground was the immediate area around the repeater. Crevasses were clearly visible where the glacier passed on either side of our site. After about an hour Steve suggested that we open the survival bag and set up the tent. By this time I was pretty sure we were going to be up here for awhile, so we might as well get comfortable. All field crews are issued a survival bag that contains a tent, sleeping bags, camp stove, and enough food for about a week. The thought of spending that much time trapped on a 100x100 square foot area was not too appealing. I didn’t even bring a book on this trip and there wasn’t much we could do to relieve the boredom. I found myself thinking that if I drank two of the juice drinks that come in those waxed cardboard boxes, I could light the stove, melt some snow, and rinse out the boxes to make a container for my contact lenses. Of course, I hadn’t brought my glasses either, so I was pretty annoyed with myself for this bit of poor planning. The survival
bag is quite an interesting tool. I applaud those folks who pack the gear
into it. When you open the bag, it’s similar to a child’s jack-in-the-box
toy. The gear practically jumps out and there is no way that you’re going
to put it all back into the container. Setting up the tent was a quick
task, but two hours later we were both still sitting on the rocks looking
into the distance willing the weather to clear.
It descended and then stopped to hover a few feet off the ice. The crew chief called to us and said we’d have to jump up onto the landing skid. The pilot was having trouble distinguishing the ground from the sky and was concerned that the rotor might hit the snow on the up-slope side. If you’ve never stood beneath a hovering helicopter, it’s hard to imagine the feeling. The main rotor generates a downdraft approaching 80 miles per hour. We had to hang on to everything to prevent it being blown off the mountain and the increased air speed creates a significant wind chill making it even more difficult to work. Steve managed to wrestle the survival bag into the cargo bay, but I was having trouble with the tent. It was wadded into a big ball and as I tried to pass it to the crew chief, he got ahold of one end and the whole mess unrolled and flapped crazily out the door. I thought he was going to loose the tent and I remember thinking that if the choice is either the tent or me, the tent is history. I reached out and managed to grab some of the material. Tugging mightily, the two of us got it into the cabin. With nothing left to stow, I grabbed the outstretched hand of the crewman and was pulled inside. Thirty minutes later we were dropped off in McMurdo and soon I was back in my quarters with a warm drink and feeling very thankful that we were home. As it turned out, the clouds dropped lower right after our rescue and it was three days before we could see the mountain again. Thank you to our Kiwi friends! If you’re interested
in going to Antarctica, there are many such adventures to be found. Raytheon
Polar Services is the current employer for the U.S. program. Their offices
are located in Centennial, Colorado and they hire hundreds of people each
season to staff the three main facilities of McMurdo Station, South Pole
Station, and Palmer Station. A job fair is held each year in April to provide
staff for the next summer season in Antarctica, which begins in late September
and continues into February. Their employment web page is: http://www.polar.org/hr/employ/index.asp
Of course, they have many more applicants than available positions, so
good luck!
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