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I bumped into kk4vcz at Defcon in 2021. I was standing around, looking clueless, and playing with my Baofeng near the ham radio village. He approached me and asked if I could transmit on a particular frequency to help test his watch. I said something along the lines of "oh that's really cool, I've read that guy's blog and follow him on Twitter." He said something along the lines of "yeah, that's me."
He even gave me a couple GoodWatch boards. Nice guy!
He's also a hero of the MD380/390 mods and I believe also DMR access point boards and software. Great guy
This is delightful. I would love to start working on a project like this.
Side note, as someone who works adjacent to the RF and electronics industry, getting my Ham license was the best thing I could have done to help my CS brain understand the radio and electronics side of what we do. If you’ve ever been curious about getting your license, I highly recommend it!
Thanks for your enthusiasm. I'd been thinking about it and heard there's a group nearby, I've just reached out to them to begin the process and they have a training event in a few weeks' time. Looking forward to it!
Followed through and passed! Call-sign pending. Commencing splurge on radio gear...
What's Ham radio like these days? My grandfather was a ham and I have fond memories of him teaching me about radio waves (and early computer programming!) as a kid in his den.
I still remember that he was W4LMU, and searching on it finds this:
https://www.qsl.net/kq4pl/skeys.htm
His gear was huge, still used vacuum tubes (already retro in the 1980s but he was a Ham), and consumed enough power to run a small neighborhood. He'd be delighted with this.
Ham radio is a hugely diverse hobby these days.
Personally, I had been thinking about getting my license, but finally did it as a extra skill for my SAR team application. As the younger guy with the rope skills, I got into infrastructure work. Towers and antennas and remote cameras and microwave links, etc.
People are into everything from mesh networking to digitally encoded communication methods to hiking to remote mountaintops and seeing how many people you can contact to building prepper type SHTF communication systems to contesting and seeing how many/how far contacts you can make to setting up data collection systems for scientific research to supporting public safety, large events, and emergency communications. And a lot more I'm not coming up with off the top of my head.
My local radio club was in an area with a lot of retired defense and aerospace type engineers but it also had younger folks from tech, media and anything else type backgrounds.
You don't need a license to explore and have fun.
Cheap, firmware hackable HTs are hawt, in particular the Quansheng UV-K5,K6.
Tons of SDR receivers out there to explore, and many extremely exiting transceiver projects out there also. Just so much:
Listening is license free but transmitting in the US on any of the interesting bands (ie not just DMR or a walmart walkie where the device is licensed instead of the operator being licensed) requires a license.
General rule of thumb in the US is that either the device or the person has to have a license to transmit and most of the Chinese radios are not licensed. Another easy check is that most of the specs for radio based licenses require that the antenna be permanently attached at least for hand terminals.
One big thing recently is POTA and SOTA where people go to parks and mountain summits to make contacts. The latter requires small radio, putting up your own antennas, and using Morse code.
People talking on the radio is sort of dead. HF is still popular. There is FT8 digital mode that let's make contact with low signal. I've reached Australia, Chile, and Russia from west coast.
There is a lot of hacking, but it doesn't seem to get into mainstream. But there are lots of things to build; I have little radio waiting to be soldered.
Something wild that a local Bay Area group of hams do is Parachute Mobile. It's just what you may guess: they jump out of an airplane with ham rigs strapped to their chest and make contacts from under the canopy.
> People talking on the radio is sort of dead
In my area, we used to have quite a bit of traffic on one 2m repeater, mostly around morning and afternoon commute times. We had a retired police officer who seemed to spend most of the day chatting. He went away, and most of the chatter went away with him. I would guess all the guys who used to talk while in their cars are still out there, but no one is getting the conversation ball rolling like he used to.
> People talking on the radio is sort of dead.
That's a shame. I have vivid memories of one radio or another chattering away in my dad's study when I was a kid. Of course, to the point I guess, he's still around but doesn't really do any of that anymore himself. He now mostly plays with radio astronomy in his dotage.
POTA seems to be pretty active -- I managed to make a couple of voice contacts a few weeks ago on a 5W rig, so voice work isn't out of the question.
> People talking on the radio is sort of dead.
I don't have any reference to how it used to be, but there's a fair amount of voice activity on the 2m and 70cm repeaters near me.
Lots of folks remember the 2m/440 activity in the days before unlimited cell phone minutes. Nothing compares to that. I'll say that, in my major west coast metro, the repeaters are pretty dead outside of nets.
Somewhat disagree, it depends on the club. For example, I've experienced a lot more conversation on the W3OK repeater vs the W4MLB repeaters
It's good to go into radio with an idea of what you want to do with it, then find a community of hams who enjoy doing that. People chase distant contacts, they practice emergency communications, they run low-power stations from remote locations, and many more kinds of activities.
Mike - KE8ATC
if you get licensed you may be able to obtain his old callsign as your own
Something really cool I stumbled upon recently - someone near me hosts a trivia show via ham radio once a week, and other folks in the area will listen for their callsign and then answer his questions
Makes me really happy to run across random unexpected things like that
By the same author https://www.amazon.co.uk/PoC-GTFO-Manul-Laphroaig/dp/1593278...
The PoC||GTFO series, I only have vols 1 & 2, have to be some of the most fascinating books ever published. These and Stevens’ Advanced Programming in the Unix Environment are the most fun in my bookcase.
Are there limits on what can be done in a wristwatch? I mean in terms of RF reception? Like, is it possible in such small sizes to receive any frequency, or is there certain limits, say based on heat, or necessary component footprint or other constraints?
I think the primary constraint would be the antenna. Generally speaking, the longer the wavelength, the longer the antenna needs to be to efficiently receive it (or transmit it). You can still receive/transmit with a too-short antenna, but efficiency drops off very quickly.
Thanks! This makes me wonder if it might be possible to build a wristwatch SDR, essentially the same as this project but with a very wide band into the Ghz, as with some small USB SDR's. It'd be so cool to have something so versatile in Casio form-factor.
This watch uses a wire in the wristband. Can the antenna length be increased by simply using multiple coils?
Antenna design is wildly complicated, but once you start coiling you get more problems as it becomes more inductive and you get weird phasing. I think the short answer is no, but this is out of my element (unintentional antenna pun)
How does one create a circuit board tiny enough to fit inside an existing wristwatch? I didn't see any photos of the circuit board.
This seems to be the replacement board shown here: https://github.com/travisgoodspeed/goodwatch/wiki/GoodWatch3...
Check the GitHub link. Their PCB replaces the original in the watch.
That would be a heck of a fun thing to build. Seems to require a heat gun though, which puts it out of my reach for now.