<div>Re-sending...<br><br></div>
<div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">boeing377</b> <span dir="ltr"><<a href="mailto:BOEING377@gmail.com">BOEING377@gmail.com</a>></span><br>Date: 2009/8/20<br>
Subject: [AlincoDJ-G7] PARACHUTE MOBILE 1.2 GHz FM this Sunday 1280.225<br>To: <a href="mailto:AlincoDJ-G7@yahoogroups.com">AlincoDJ-G7@yahoogroups.com</a><br><br><br>
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<p>Mark AF6IM and Michael KF6WRW will be skydiving at Byron CA this Sunday and will do some HAHO (high altitude high opening) jumps to give us enough time to do ham radio comms. Jump altitudes will be approx 14,000 ft. We will not be using oxygen gear.<br>
<br>These are practice jumps for the big event planned for October, HF radio HAHO jumps at an altitude of 18,000 to 24,000 feet depending on FAA clearances and conflicting air traffic. We are using these practice jumps to work out kinks in mounting, mics, noise cancellation, headphones etc. and just getting used to flying our ram air ("square") chutes and communicating simultaneously.<br>
<br>I plan to operate on the 1282.225 MHz repeater for at least one jump. I will announce about a half hour pre jump as I can reach ths repeater from the ground in Byron. <br><br>Jon, K6OJ, our crew chief, will be on the ground at Byron and will coordinate some 2 meter simplex comms for me. Details to follow. I will call Michael KI6QNZ by phone from Byron to give him an ETA on jump times Sunday. He has volunteered to put out the info on the N6NFI repeater 145.230 which we cannot reach from the ground in Byron.<br>
<br>We would like to use APRS for more than just position reporting on our later jumps. Relatively cheap pulse oximeters now have USB output. We'd like to have APRS report our blood oxygen levels and pulse rates to our ground crew. <br>
<br>If we have oxygen system failures we may not be able to recognize them ourselves due to hypoxia. Ground controllers could detect it and try to inform us by radio. Even if we did not hear or understand the radio warnings, the ground crew could at least see our altitude, heading and speed and dead reckon where we might be landing in an impaired state. The ground crew could dispatch resources to our predicted landing area which could be miles away from the DZ. From 24,000 feet in calm air, we can glide about 15 miles horizontally, much more if we are running downwind. Garmin 350s (or the more expensive Kenwood APRS GPS plotters) interfaced to APRS could prove very useful. On these recent practice jumps we had winds up to 20 knots at the higher altitudes and had to fly into the wind to maintain position over the DZ while descending.<br>
<br>We'd also like the ground crew to help us calculate winds aloft (speed and direction) during our jumps. If we make a constant rate turn of 360 degrees, our ground track in calm air will be a perfect circle. If there are winds aloft, the circle will be distorted. We should show a peak in groundspeed when running directly downwind during the turns. It is too complicated to do the figuring under canopy, but pretty easy for a trained ground crew. We will need quite a few people because there are so many different tasks to do during the jump. Jon K6OJ will be determining resource needs and allocations. I am sure he will welcome volunteers.<br>
<br>The October jumps were originally scheduled for Monterey (Marina airport) but we are considering Byron too. In the event of an oxygen failure, an uncontrolled parachute could head FAR out to sea (over 15 miles) from our planned altitudes if we jumped at Marina. Byron has its own nearby hazards: windmill farms, high voltage towers and lines, canals and lakes, etc. We are balancing the risks and still deciding. Byron is a bit closer to our ham community. Monterey offers incredible aerial scenery. We will carry floatation gear no matter where we jump, but a far offshore ocean landing could prove fatal due to hypothermia even if afloat. if we choose Monterey we may wear anti exposure jumpsuits. I have some surplus ones used by flight crews. VERY uncomfortable (basically a drysuit) but better safe than sorry.<br>
<br>Anyone out there have the expertise to interface a pulse oximeter with APRS to report blood oxygen levels?<br><br>We'd also like to get ATV coverage of the October HF jumps and maybe even some of the practice jumps. I'd be willing to fly a video camera and ATV xmtr, but dont have any gear. Any ideas? My nmail address is below. <br>
<br>LOTS to do in advance of our October jumps. Any help or suggestions would be greatly appreciated. I will also have a portable ADF ready for October for the use of our ground crew. Additional DF resources will be welcomed. I will carry a VHF location beacon, probably on 121.7 MHZ AM and an emergency beacon on 121.5 MHz AM to be activated if in distress. <br>
<br>73,<br>Mark<br>AF6IM<br><a href="mailto:af6im%40arrl.net" target="_blank">af6im@arrl.net</a><br><br></p></div>
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