616 results found
- Stay safe - missing you all
Hey All I hope you all had a fun and fabulous winter field day! Im missing everyone and wish I could have been there. Also, good luck with coming nor'easter! Although I am enjoying being in warmer climes I do love a good winter and wish I could be there for the snow, skiing and winter camping! Kate
- This ain't yo mamma's AcuRite
During my 15 years of work at SUNY Albany, among all the other projects I got to play with, my favorite was working with ASRC (Atmospheric Science Research Center). I made them a 24 foot Mini Maritime Mobil Weather Station. They would take it around the state measuring and recording dozens of air and water parameters adding a time and GPS stamp to every data frame. This is the heart of the system. All custom design and fabrication by me. The top section is the Campbell Scientific Data Acquisition Computer. The middle unit is the Gas Analyzer unit. This bottom unit is custom to route and regulate the gasses to be analyzed. About the only similarity with our AcuRites is the bubble level on top. The whirly gig and tail feathers we use to measure wind direction and velocity just wouldn't cut it. Here they use 3 ultrasonic transmitters and 3 receivers in a pitch - catch configuration. The electronics measures and analyzes the Doppler Shift of the 3 signals and generates 3 signals of data. An Orthogonal output, wind speed in the X, Y and Z axis! Now, we tie that in with a filtered air sample inlet, a thermometer probe, and a flight path turbidity unit. This is my design for an Equillibrator. Water is feed into the pipe on top. It comes out the nozzles as an atomized spray. The water accumulates in the cylinder. At a certain level, the blue float rises, opening up drain ports to keep a constant water level. The grey fittings on the top are for tubes to circulate gasses escaping from the water to the gas analyzer. On to bigger and better... We mount our equipment to the tower on the bow of an ocean going research vessel. After numerous trips around the state in the pontoon boat, they now set off for campaigns to the Caribbean, The North Sea, and the Southern tip of Chile to Seattle. With a TON of data, there is just one final destination. Antarctica!!!! So, here is the plan: Antarctica, even in the summer, is a very hostile environment! So, the closest we can get to these conditions for testing is SUNY's weather station on top of Whiteface, mid winter! This is nothing compared to the Rhime Ice buildups we expect on the cruise. We are going to test various heat tapes, including special insulated and heated tubings. The Weather station's outer wrap around balcony. Control central! (The roof leak can't be addressed until late spring!) Snowmobiles are the only way to get to some of the equipment. If your drive belt starts slipping, STOP! If you don't stop, IT WILL STOP EVENTUALLY!!! This is what is left of their sled when a contractor borrowed it and didn't stop. It took hours to cool off from the fire, in spite of the cold! No slipping drive belts here! Somebody caught the photographer. The guys for the Whiteface trip. The person in the center is a researcher visiting from Ireland, Dr. Brian Ward. The person in the dark jacket is Dr. Scott Miller. He is project leader, all around good guy, and a friend! A lot more info on Scott's project can be found here. Lots of pictures, charts and technical data. http://bloomcruise.blogspot.com/ Enjoy, Jim K2BHM
- Blow hard?!?
The Beaufort Wind Force Scale is an extremely easy to use tool to assess weather conditions especially under field conditions. It is a well researched, scientifically based system that is endorsed by the National Weather Service for use by its Weather Spotters due to its extreme versatility under almost any conditions. Likewise many other agencies use it as well. I was trained in this by State of Maine for my Guide training, in multiple Search and Rescue classes, as well as in my US Forest Service Forest Fire Fighter training. US military uses it extensively. Likewise it is still used routinely in international shipping and aviation. It is extremely useful due to its ease of operations even when your batteries died, your wifi is down &/or your anemometer is frozen up. So useful that U.S. Air Force Combat Air Controllers (CAC), still use it to call in Air Traffic Control for complex air support operations for multiple planes and multiple drops of paratroopers and cargo from behind enemy lines. (Sorry guys, but Marine motto of "First In" usually isn't true. CAC's jump solo behind enemy lines up to two weeks before a large operation to call in weather. They make the Go/No Go decision based off field observations from the ground) Granted the Beaufort Scale is not as specific as what new fangled fancy tech can give you, but it is quite versatile and adaptable, and with field ops such as Search and Rescue (SAR) or Forest Fire Fighting rarely does a 2-3 MPH difference matter. Overall patterns and trends make a difference not an individual reading. In field conditions you can get constant "read outs" of conditions as the operation is ongoing just by maintain your normal situational awareness. However as with ANY device it should be calibrated before use. You want to make sure the numbers you are calling in are accurate. In this case calibration means training your eyes to see and your brain to recall what those movements mean. You need to learn how to make the observations accurately. Then you can do wind speed any time anywhere under almost any conditions, even at night! The best way to do this is pick some regular views with a variety of trees and start observing their movements. Yes tress actually move. A LOT! You just probably never had reason to take notice of it before. There are set and predicable ways the tress move depending on the wind speed (i.e. pressure) that is applied to them. Of note different trees will give different readings. Soft woods vs Hard woods obviously have different flexibility and foliage so will respond to wind slightly differently. Thus you need to observe a variety of trees and get used to their responses. It is quite easy, just takes a little time and focused effort. So, first things first, forget the scale and just look at the trees. Look at the smallest branches and twigs, can you see that they are actually swaying back and forth? If not keep watching the same spot for a few minutes, you'll be surprised at the choreography been shown to you! Once you see the very tips move, move up the branch a bit and watch how that moves. It's actually quite different than how the tips do. This is due to a complex combination of biology and physics that we need not go into, just have fun and watch the dance. Next move back farther towards the trunk and see how the bigger branches move in a waltz compared to the line-dance of the branch versus the break-dancing of the twigs. Once you see that trees move in predictable ways, then you can look at the chart below and start to correlate each dance step of the tree to the tempo of the music the wind is playing. Last step of the calibration process is once you can consistently correlate your observations to the Beauford Scale then compare your Beauford Scale readings to your own high tech wind speed gauge and tweak your assessments to make sure they line up. Again tress dance differently. Hardwood trees are usually best to observe, but when you can correlate an evergreen's dance against a hardwood's dance now you are adding a layer of sophistication to can rival the high tech gadgets! And no internet required! Download your own PDF version below
- Home | Mid-Hudson Mornings
Click here to find an FCC Amateur Radio License Exam Near You 835 on the 805 Mid-Hudson Mornings Our DMR 'Home' Talk Group 31368 Use 'Search Results' for specific topics, keywords, ideas and phrases. Download our 6 Meter Simplex Results June 2021 Download our Tannersville to Tuxedo Simplex Test 2-Meter Results Matrix February 2021 50 Mid-Hudson Repeaters Download .XLS File Download our Tannersville to Tuxedo Single Side Band 2-Meter Test April 2021 Download our RF Contact Matrix 10, 6 and 2-Meter June 2020 Visit our map of Mid-Hudson Hams A Community of Amateur Radio Enthusiasts At 8:35 am each morning we gather together on the Overlook Mountain Amateur Radio Club repeater (the '805') to 'keep together while staying apart'. Amateur radio is the original social media with no internet required.
- Antennas / Propagation / Local Tests | Mid-Hudson Mornings
Antennas Info Archive End-Fed 80-10MHz Half-Wave Antenna RF Contact Matrix 10, 6 and 2 Meter Tests June 2020 Tannersville to Tuxedo Simplex 2-Meter Test Results Matrix February 2021 Tannersville to Tuxedo Single Side Band 2-Meter Test April 2021 Nano VNA Antenna Tester / Analyzer 6 Meter FM Simplex Test June 2021
- Digital Modes | Mid-Hudson Mornings
Digital Modes Archive AC2KV's Digital Mode Musings The DMR 'Dope' [links to DMR info] DMR Worldwide Net on TG-91 High Quality MMDVM Modems DMR...Is it for you? DMR Q&A Video 7/24/20 DMR Glossary 2020 DMR Talkgroups Abound! Nice Beginners Guide For Setting Up A Pi-Star Hotspot! My Pi-Star Hot Spot construction project. Choosing a DMR Hot Spot Simplex Frequency Pi-Star MMDVM Modem Calibration Pi-Star Setup for MAC OS X Users from Bob K2LD DMR without RF, tests Great explanation of BrandMeister dynamic, static, and auto‑static talkgroups
- Will A 74' End Fed Antenna Work On All The Bands?
What happens if you live in an area where a full sized dipole antenna is an impossibility and you want to at least TRY to get all the bands? DX Engineering came up with a solution .. a 74' End Fed (Vibrolux) antenna .... Paul Brown ordered it, Joe Gera Designed it .... Fooch (Guy), Kenny,Chris and Me (KD2UUI) were on hand for the install ... teamwork .... The Overlook Mountain Radio Club probably has the best friends you will make in this lifetime.
- Transparent Carburetor
I came across a very interesting you tube video. This guy built a simple carburetor out of clear plastic, describes it's operation, and took high speed videos of it in action. It's a bit long, but very interesting. Enjoy, Jim