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Sunday, October 15, 2023
Spy Rigs, Para Sets, Bugs, and Enigma Machines -- Dr. Tom Perera W1TP (video)
Wednesday, September 14, 2022
SolderSmoke Podcast #85 With Mike Herr WA6ARA June 8, 2008 WIZARD ISLAND!
When I was putting this podcast up on YouTube, I needed a picture of Mike Herr WA6ARA who was my guest on this episode. I found a picture of Mike activating a summit... THE SUMMIT OF WIZARD ISLAND! That is Wizard Island (above). Mike and his wife are shown at the summit (below).
Monday, May 24, 2021
Parasets, Parachutes, and Tubes in "A French Village" Season 3
https://en.wikipedia.org/wiki/Un_village_fran%C3%A7ais
In season 3, Episodes 7 and 8, resistance members parachute in from London. They are equipped with what looks a lot like a paraset. One of their tubes develops an open filament. The Germans engage in radio direction finding. The Morse code is fairly good (but not great). All in all, there is quite a bit of radio-related material.
"A French Village" is a very well-done series. But it is (of course) quite dark.
Saturday, January 9, 2021
A Parachute that Flies Home Autonomously
Too often ham radio bloggers and podcasters tend to focus their efforts on the projects of, well, older guys like us. I think it is a good idea to direct attention toward young innovators, the next generations of people who are working on interesting new projects using new technology.
Yohan Hadji is definitely one of these young innovators. He is 16 years-old and is working to develop a system that would guide the parachutes of descending balloon payloads to designated safe landing areas. Having spent a lot of time chasing the parachutes of Estes rockets, and after having to PERSONALLY guide my own parachute to a safe landing area (sometimes without success), Yohan's project caught my attention.
The videos above describe the project.
A Hack-A-Day article provides good background:
https://hackaday.com/2021/01/07/gps-guided-parachutes-for-high-altitude-balloons/#more-454705
And finally, if you want to support Yohan's work, he has a GoFundMe site:
Sunday, January 3, 2021
An End to the HDR - SDR Conflict? Kevin AA7YQ Combines the Best of Both Worlds
We've had some pretty amazing contact with Kevin AA7YQ over the years. Kevin and I originally bonded due to our common experience with parachutes (he was smoke-jumper, I jumped while in the army). Kevin once used a parachute to insulate a QRSS beacon. And one day, while thinking about SolderSmoke during a drive through Montana, Kevin turned on his rig only to hear... ME! He caught one of my infrequent CW contacts. TRGHS.
Now we hear that OM Kevin may be poised to end the HDR-SDR civil war that has for so long been dividing our great podcast. Can Kevin's new rig heal our wounds and allow us to enjoy the beauty of SDR waterfalls while not forsaking the joy of hardware defined rigs? Kevin will soon launch a blog describing his effort at rig-building. See below for a preview. Stay tuned.
Kevin wrote:
I am currently working on a new rig design. It is a hybrid HDR(Hardware defined)/SDR radio that incorporates some classic superhet design along with some of the more useful features of SDR. I have found that pure SDR is really not that enjoyable for me. I love using GNU radio to mock up and test design concepts, but SDR basically dilutes the “magic” of radio to nothing more than software and touchscreens, stuff we use every day all day. Its not the Ham Radio I grew up with as a kid and was fascinated by. On the other hand, I have always fought temperature drift, large variable capacitors minimal tuning range, and associated with classic VFO and VXO designs. In fact, in 1997, for my senior capstone design in EE at Montana State University, I designed a 20m superhet that used a DDS LO. At the time DDS was cutting edge technology I used an AD7008JP50. I had to beg and plead with ADI to get a couple samples for my design, since they exceeded my self-funded college student project budget. 😊 But that’s another story. SDR has made me grow extremely fond of the waterfall display. I love having the visual “situational awareness” of what is going on in a moderate bandwidth outside of the spot I am tuned to. I also am a big fan of digital filtering and modification-ability that comes with boot-loadable microcontroller designs. So this design includes most of the real highlights of SDR but does not take the fun out of designing, building, and operating a HDR.
Anyhow, this design is a big goal of mine to complete and build in 2021. I am not retired yet so I still have to balance, work, family, and tinkering time, but I am very excited about this project. I have “noodled” this design to the point of what I have achieved full-on “analysis paralysis”. That is, I keep designing and redesigning, optimizing, and figuring to the point where after months of thought, I have nothing to show for it 😊. So my New Years goal for 2021 is to make “good enough” rather than “perfect” design decisions and move forward. I will keep you posted on the design and possibly start a blog so I can get some peer review input from the greater RF Design/Homebrew community on my project. I’ll keep you informed on my progress.
Saturday, April 5, 2014
Parachutist's Helmet-Camera Images Falling Meteorite
Just because it is pretty cool. Also, we like parachutes, meteorites, and Norway.
Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20
Thursday, April 18, 2013
Yellowstone, Smoke-jumpers, and SolderSmoke on 20 CW
Anyhow I had finished programming and tuning a large batch of radios and today I was making my rounds to deliver them to the various offices. My route was from Bozeman (where my shop is) to West Yellowstone (where I used to jump out of) … through the North side of Yellowstone Park to Gardiner), then following the Yellowstone river north up the Paradise Valley (where I grew up as kid) to Livingston (where I live now). I must say it’s an absolutely beautiful drive that took me to 6 of my delivery points. This time of year Yellowstone Park is closed to normal traffic, but official Gov’t use is permitted, so you see very few other vehicles, it’s a pretty neat time of year to be in the Park.
Anyhow 73’s,
Friday, April 10, 2009
Parachutes and QRSS
Howdy Bill, It’s Kevin here in Montana, the ex-Smokejumper. I’ve been meaning to write again. Thanks for the nice comment on SS #100 I got a kick out of it. Anyhow, just thought I’d drop you a note to let you know I finally had a weekend to design and build up a QRSS beacon. I used a Cypress PSoC CY24123A uC to function as the Crystal Oscillator, and keyer. The final is two paralleled BS-170 MOSFETs running in Class-E mode to give me about 560mW out with a 7.5volt Lantern battery as my supply, total system power efficiency is about 63%(RFout over DC in), I’m sure this could be significantly improved, but good enough for now. After several hours of tweaking the capacitor values I finally got the oscillator to fall into the 100Hz window. That was MUCH harder than I had anticipated. With the original version I switched the PA on and off for true QRSS 3 CW, but found this made a significant frequency drift problem. So I added a couple parts and modified the PSoC code a bit, now its running CWFSK, switching about 1.1pF on and off one leg of the XTAL, shifting the frequency about 10Hz and much more stable.
My first tests were with the board sitting on the bench under the desk lamp. This caused all kinds of drift problems. I then put the beacon in a Tupperware container and placed it inside a soft case cooler. I was looking around the shack for a blanket or something to further improve the insulation, when low and behold sitting in a garbage sack… was a condemned FS-14 parachute (equivalent to the SF-10A) that I was planning using for something useful. So I wrapped the chute around the cooler and stuffed it all back in the garbage sack. Surprisingly, temperature stabilization was achieved, beyond my expectations.
The beacon is running good now, nice and stable. I’m fairly certain, that in the history of mankind, no one has ever used a parachute to improve the temperature drift characteristics of a QRSS beacon. Anyhow, I plan on having it fired up quite a bit, so that my antenna is actually put to some good use. It seems I rarely get a chance for one to one contacts anymore. Most of my free time is spent designing and building the radios I never use. Ha. I guess the design and building is the real fun for me.
Anyhow, I’ll talk to you later. 73s Kevin, AA7YQ
PS the Beacon is sending “AA7YQ” followed by a several second pause. It’s showing up on the K6HX grabber between 10.140050 and 10.140060.