Lots of dismissive comments in here, which I don't understand. KV4P did an awesome project that he spent a lot of time and effort on, and then shares it with the community. I think he did a great job, and I am very tempted to build one myself. I've been doing HF only, but this makes me want to start exploring VHF.
how the turntables. Back in the 80s my grandfather (N4MDB RIP) had a ham radio in his car and used something called an "autopatch" which could dial phone numbers. He'd call my grandma and say we were going shopping or whatever. Everybody from the shack could listen in with their radios.
He tried to get me interested in ham radio but at the time I was exploring the internet and ham seemed... boring? Overly fussy with its technical license and morse code? He did give me a shortwave radio and explain how radio waves could bounce off the atmosphere (which seemed like science fiction honestly) and I got to listen to numbers stations.
>He tried to get me interested in ham radio but at the time I was exploring the internet and ham seemed... boring?
Might wanna be careful, you might get your turns tabled and become that grandfather one day. :V
No more morse code on the exam. Hamstudy.org is a great study aid.
For any one interested in doing this, getting your Technician (lowest level) is pretty easy. If you're already familiar with very basic circuits and electronics you could probably go in blind and have a >50% chance of passing (there are questions you'll need to memorize). Go through the practice exams, you'll see.
But here's the thing, you don't need any time to wait to take the General test (mid level), and there are a lot of benefits to General. (Here's the chart for frequency allocation[0]) You can take the test the same day and won't have to pay an extra fee. (I've seen a few do all 3 in the same session, but time is probably an issue) So even if you don't get the General, it is worth the shot. You'll definitely need to study for the General though.
Your license stays with you for 10 years, so it can just be nice to have in your back pocket (and with this kit, quite literally)
[0] https://www.arrl.org/files/file/Regulatory/Band%20Chart/Hamb...
True. Honestly, if I was going to do this (I won't) I would probably just set aside a couple weeks to train a deep net to parse and generate morse code (a near-perfect example already exists: https://github.com/f4exb/morseangel) and in the process of debugging the model, will end up dealing with so many audiovisual examples I'll end up knowing morse without actually studying.
Danke! I will be checking this out tonight.
My dad (W6FP RIP) did the same. I thought that was pretty neat but not enough that I ever got into ham radio.
It makes me wonder if anyone has archived the number stations broadcasts
Yeah those "autopatch" devices were illegal - Ma Bell had rules against connecting any radio to the telephone system. Probably worried about long distance revenue.
The portable radios/cord free telephones back then were a bit of a legal gray-zone.
>> Back in the 80s [...].
> Yeah those "autopatch" devices were illegal[.]
Hadn’t the Carterfone decision[1] made them legal already in 1968?
This is a wacky idea, but the "modern" thing to do would be to repurpose seldom used 2-meter repeaters and make them 5G gNBs in the 3300 to 3450 MHz ham band (which overlaps NR band 78). Then you could directly use your cell phone (with a different SIM card) as your ham radio.
Network gaming servers to the gNBs and every kid in the US will want a ham license.
I went down this rabbit hole for a while a few years ago. I think it's doable, but I don't have good answers to a few questions:
1. How do you get cell phones to automatically identify in a way that satisfies the part 97 rules?
2. How compatible are modern smartphones with the null encryption cypher?
3. With fewer and fewer physical sim slots, is it possible for an amateur to produce valid eSIMs? (And is it possible without internet access, such that you could onboard new users during an internet outage?)
1.- You get a "nice PLMN" for the network and assign phone numbers (and manage key material) only after Ham Identification. DMR Style (at least here in Spain)
2.- Most of them will refuse to join any Private SA network that does not use SUCI and encryption (in my experience). If you have a "nice" PLMN, they will connect. What a "nice" PLMN is varies between modems, the testing PLMN is a safe bet :)
3.- Also gone down this rabbit hole. eSIMs must be signed by a GSMA authorized key, and they are picky. Osmocom people have relationship with someone that signs profiles for them (for pay). The crypto is quite straight forward to do offline, eSIM profile distribution not so much. Key propagation from generator to core network and final client (ue) would also be a challenge. Another option is using the testing certificate, it should remain active in most modems for certain PLMNs. I have yet to test this, but work gets in the way
There is a variety of open software and COTS hardware that could fully power this network. The client side is the hardest part, especially if you want a phone.
PC modems on a Linux machine are more manageable (But expensive, let's wait a few iterations on RedCap maybe). And SIMs with ADM keys can be purchased from different sources
I would love to set up a real managed digital network for hams, with stuff like roaming and the like.
But I'd be more interested in technologies that are one to many rather than the one to one calls on mobile phones. Open public channels keeps the ham community connected.
Something like DMR Tier 3 or Tetra would be great.
How do you "repurpose" a 2m repeater for that?
Swap out all the RF hardware. It's the high level site that matters.
You also need a 5G core to make that work. Also probably an IMS to actually provide some services on top of that. You also need to rip out all the encryption for the ham bands.
I'm 99% confident that wouldn't fly and the definition of encryption is broad enough to cover even a "loophole" like this. I believe you'd have to demonstrate that you're actually "controlling" the phone rather than just performing communication and I'm not sure the communication with a vehicle actually is covered by the encryption cutout. My understanding is that it is so others cannot take control of the vehicle you're operating (which may leave you liable for whatever damage they cause with it, or at least makes that more ambiguous)
The real core is giant mess of servers but it's all software, no ternary vacuum tube device is involved. There are few OSS implementations and some even commercial ones that runs on single PC.
But why swap it out then? Just install the new hardware alongside.
I think you misunderstand my point. My point was: If you have to replace everything why not leave the existing repeater up and add all the new hardware as well :) There is no need to take down the 2m unless the location is severely power or space constrained, which is not really the case for most of the high sites I've seen.
Replacing it only makes sense if you could reuse some hardware so you have to choose one or the other (or to invest in buying new). But in this case it will be 100% new so that discussion doesn't come up.
if it requires swapping out "all the RF hardware", why not keep the 2M repeater at this high level site and add your new repeater adjacent to it?
This is something I've thought about quite a few times, and I think it is a crazy idea but worth exploring. I'm way too naive here and have had almost no time to experiment due to other priorities.
But I think you could set up a global mesh network. I think what sucks is the encryption rules, but if there could be a big enough force that demonstrates it and its usage, those rules could get changed (there is already pressure to do so).
Now one thing though is there's some fuzziness about the definition of encryption with the FCC's definition[0]. Would this include routing protocols and/or compression? If they're open source protocols? If call sign is sent uncompressed and clear? This seems to be kosher considering other projects I've seen. So the messages might be able to be snooped on by anyone, but this would mostly be for fun and demonstration, like Ham is. But also, I think it would be pretty cool to have an open global communications platform. It would definitely also serve as a useful thing for natural disasters. (But we're not in the cold war anymore... we have encryption over the internet and that's even much more obscured. It would be nice to see encryption and a community driven global communication network)
The other thing I've been wondering is if anyone has tried satellite bouncing with the starlink sats? I'm sure they wouldn't be too happy about that, but hey, it is at least interesting to understand conceptually since you could really get a much larger view area and you don't need to travel all the way to the moon. But doing this you could potentially open up the network for coverage over oceans (at least more easily)
[0] https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D...
Long time ham. Never been that interested in 2 meters but I am ready to buy it! Such a clever idea, wonder why no one has ever thought of it before.
http://www.mobilinkd.com/ is probably the closest pre-existing thing that is similar. I don't think this was lack of imagination, modules like the DRA818V make building a fully integrated unit a lot easier these days
I had so much fun operating APRS through the space station with a car 2 meter radio and a moderate mast antenna in a terribly hilly spot but be able to see stations in the South Atlantic and Midwest states. Also the time I was on a 2 meter HT walking in the woods and heard the astronauts talking to hams. And the time the computer told me it was just about to be visible and went outdoors and the ISS was huge and bright, more an airliner than an asterism.
https://www.hytera.com/en/product-new/lte-broadband/lte-radi...
https://www.wouxun.com/radios/two_way_radio_kg-v98.aspx
There are combination PoC (push-to-talk over cellular) + WiFi + VHF/UHF radios.
I think the problem as it relates to HAM radio as a hobby, is that if you have cell signal and cell phone, usually any other radio is less effective.
So while it is nice to use the interface/battery/CPU of a cell phone to drive a radio, it's superfluous if you have a cell signal. If you don't have a cell signal, usually having 5W for analog voice in an HT is much more important than having a special interface or digital modes.
I always ask myself why no any cellphone producer is making a phone with 2m/70cm capabilities.
I used to ask the same thing back when car stereos were all the rage --- I wondered why I couldn't get shortwave or SSB or Air/VHF reception and the answer lies in use-case. Yeah, you and I might eat up this super niche product, but the market on the whole would not. Just look at what electric car makers are doing with AM radio. They're saying "screw RFI problems, we'll not filter those and just remove AM reception from the car radio because who needs that?" The answer is a larger slice of the population than would want other radio services. Even Apple never enabled the FM receiver feature on their chips from Qualcomm. It's all about the time spend designing it, ensuring it doesn't cause issues with must-have features, is intuitive to access/use, _and_ aligns with buyer demands.
With ham radio making up less than 1% of most countries' populations, the need just isn't there. (Most folks you talk to are doing good just to even be aware of ham radio, let alone actually be a ham.)
Sim card radios exist.
Yes, but think about having a mobile that has native integration with APRS or can make voice/packet radio or even DMR. It would be perfect for hiking or adventures. Even better with LORA.
Probably the main issue is RF compatibility.
They do exist, I've seen several but as an example a DMR UHF Android phone: https://www.unihertz.com/products/atom-xl and the older https://www.anyradios.com/product/runbo-e81-dual-band-4g-dmr...
forgive my ignorance here please, but I've read about APRS on and off for a few years and always wondered what I'd need to just transmit some data that would eventually make it's way to the internet. I recently suggested it to a Ornithologist friend doing back country research in South Afrika too.
But why are there no regularly recommended cheap hardware solutions that can do this (and or just hobbyist builds using an RPI). Seems like the demand would be there but perhaps I'm just not understand all thats involved.
Any insight you could provide would be appreciated.
It's even simpler if you have an HT with a Bluetooth KISS TNC. You just pair the radio to an Android device, and run APRSDroid and off you go. No cables or configuration of a PC needed.
The B-tech UV-PRO and VGC VR-N76 just got firmware updates that allow that. So now you can do it with a $180 radio instead of needing to buy a $900 Kenwood.
thanks for the detailed answer, so following your explanation if I wanted to transmit scientific data at regular intervals (for my friends field work) what sort of licensing / permission would I need?
Funnily enough someone posted down a few comments here almost exactly what I had complained about not existing ( http://www.mobilinkd.com/ ) at least if I understand that page correctly.
LTE over satellite is going to be the solution, as all existing 4g phones can do it.
I wish they would get LTE/5G peer to peer working. It is defined in spec but barely anything supports it. Then could do any networking instead of limited to ham radio.
CBRS frequencies might work for that.
Do they need a simcard with an active plan or aNy simcard just works !!??
Don't believe it needs a simcard for UHF/VHF.
Even without a simcard, emergency numbers should still work if in range of a cell tower. IIRC that's a requirement of all 4g devices.
What's even more amazing, the local search and rescue helicopters have been outfitted with special 4G/5G base stations. So if they are flying a rescue mission in the mountain or other remote areas, and they come in range of your phone, not only does your phone suddenly have coverage, but they can see you connect, triangulate your position, and call/text you directly.
That is kind of cool. I did not know such a thing existed.
They exist but they are no-name brands. The phone is crappy, the radio is crappy, and the combo is a big brick. It would be awkward phone with antenna sticking out.
The question is why don't handheld radios have Bluetooth and USB-C data (some have USB-C power).
The common workaround for FM radio was to use the wired earphones plugged into the phone as an antenna. But FM radio is usually extremely, unbelievably strong (a lot of hams know that), so YMMV for other bands with much lower power signals.
That and an average headphone wire being somewhere around 3ish feet is pretty close to a quarter wave for commercial FM frequencies.
This!
Only recently are some of the cheap radio brands coming with USB c charging. I'd love built in Bluetooth pairing.
The Ulefone Armor 26 is available with a built-in UHF/VHF transceiver, but the software isn't great.
The opposite trend is radically changing business radio - a lot of devices that look like VHF/UHF transceivers are just cellphones. There just aren't a lot of environments where VHF repeaters provide more reliable coverage than LTE & WiFi.
I recently dug up my old iPod Nano 5th gen (small square one) from 2010 and charged it up, and still works fine.
What I forgot, and it totally surprised me, is that it has FM radio! I selected some stations and it worked great. And that Nano was tiny, would be cool to have this feature back in current iPhones / Apple Watches. I know it’s not the same as having full tx/rx on the 2m/70cm bands, but still, even just just listening to normal radio on iPhone would be cool.
> And that Nano was tiny, would be cool to have this feature back in current iPhones / Apple Watches.
That iPod used its headphone cables as the radio antenna. There's no easy way around that for a SmartWatch, and most people wouldn't be happy to carry a USB-C antenna dongle around with them for their iPhone.
You can of course start doing black RF magic with more compact antenna designs, but that's much more complex and still has a much larger footprint on the board than the FM receiver in that iPod nano has.
Ohh right yeah, I remember once reading about the headphone-cable-is-antenna, clever! I guess that’s why we don’t see it anymore in devices, as everyone is using more wireless headphones.
I remember that my HTC Desire Z Android phone, and possible also the iteration of a Nexus Android phone that I later owned, had FM Radio. It was relatively common back then, and I made use of it almost every day on my bike commute and such.
They used the (wired) earphones plugged into them as an FM antenna, worked well enough.
I miss those days :’
How's the battery life after so many years?
I recently found my old e-reader (Kindle Keyboard) from 2011 and the first thing I had to do was swap a new battery in, the old one would not hold a charge for too long.
I haven’t played with it long enough, need to check again.
I’m also happy and surprised that all my music files are there and that everything works. I haven’t touched it in probably 4+ years, and was under the impression that flash memory, especially older generation like 2010, can degrade / bitrot if it’s not powered every so often.
I know very little about antenna technology, but physics might play a role. 2m/70cm is pretty far away from the few-cm-wavelengths of somewhat modern cellphones (70cm a bit less so). For FM radio, the common workaround was to use the cable of plugged in wired earphones as antenna, but I don't know how well that would work for bands where the transmitters aren't as unbelievably strong as they are for FM radio.
And then there's of course the fact that almost nobody is asking for that, so the engineering and maintenance effort behind it would be insane in comparison.
If you can parlay it into an 1/8 wavelength, 25cm is probably not impossible to fit into some monstrously meandered beast that could fit in a phone's footprint. We've come a long way in terms of miniaturizing antennas, though I'm no expert.
But I think your second point hits the nail on the head - cell phones have enough antennas in them, and asking to add another one at such a low frequency is a great way to get your antenna and QA teams to look for a more sane employer, and to put your EMC compliance partner's kids through college :)
Flipper Zero capability in an iPhone + legacy auto app to move my keyless fob onto phone would be a killer.
Imagine all the data they could collect. I would probably even buy a subscription!
There's a small company called rfinded that's doing exactly that, but they're expensive and bulky.
Anyone that has a real need for something like that is either using either very specialized (and expensive) hardware, or some peripheral solution like TFA. We already have general purpose, mass produced devices that benefit from huge scale, and there's no such scale in amateur radio.
I wish this was for sale assembled. I know probably about 50% about printing PCBs compared to what I’d need to know, don’t have a 3D printer, and I expect that the firmware and apps probably have at least one or two quirks to take into account. All together, this makes it a big difference in accessibility between being able to buy an assembled item and tinkering oneself. I know tinkering is fun for many people, but having a mobile ham is fun for many more.
P.S. Upon second glance, it looks like I’d need soldering skills, too. These things really add to the price. The price of components may be $35, but the cost of learning all these things (time) and mistakes along the way may be in the thousands if we take the hourly rate of a tech worker. Flawed comparison, I know, but you get the point.
> soldering skills
It's...not that hard. Unless we're dealing with SMDs, soldering takes about a weekend to learn correctly. Most DIY kits involve through-hole components that you can master after you take a cheap iron to a couple dozen header pins or something equally banal. SMDs, on the other hand, take a bit more finesse, but can be achieved with a wee bit of time and patience.
I work in industrial controls and it blows my mind how many people in the field are terrified of soldering, even something as simple as tinning wires so the crimps fit a bit better, let alone the amount of "DIYers" I meet that don't even own an iron. Y'all are holding yourself back by not learning this easy-to-grasp skill.
It’s not necessarily about how hard it is, but what’s the ROI on learning a skill. If soldering was something I did at work or if I often repaired my own electronics, then it could even be worth learning it if it took a month of evenings. But as I’d not have many of the tools and schematics to do component level repair on today’s electronics and I almost never need to solder anything at my software engineering job, so this skill would be used maybe once or twice in a decade on a hobby project, it is mostly not worth investing even one weekend.
We can learn a lot of skills that are useless. Coming from a conservative family, I learned to play the violin and piano at a very young age instead of spending time with friends. These are skills I never have any use for and I’d rather just have some better memories from my childhood. Even if learning to play piano was relatively easy — with one weekly lesson over about 6 months it is extremely doable.
Those are sort of the real costs and benefits of learning skills. Easy or hard doesn’t mean necessarily that it’s worth or not worth learning.
Respectfully, you're over thinking it. In the time you took to write this post (what was the ROI on that?), you could have soldered your first thing. Unless you're really not interested, you should just do it.
Touché
Learning how to solder (and to solder very well) is much easier than learning to play the piano or the violin.
It's also tool-using skill that changes the way one thinks about stuff; it opens doors.
These days I'm fairly comfortable and confident with ordering custom PCBs to support various hardware and software projects. This lets me build stuff that I would not have imagined without the ability to solder.
I don't do component level repair at work or at home if it goes beyond changing out an obviously-bad electrolytic capacitor or something, but I have rescued many things quickly and inexpensively by swapping things like obviously-bad electrolytic caps. That saves me money, and by extension it also saves me time.
I wouldn't have ever considered any of that if I didn't know how to solder.
Bonuses: Unlike learning piano, it doesn't take six months to learn soldering. And unlike the piano itself, the soldering kit is inexpensive, portable, and low-maintenance.
Honestly, learning things and doing projects together brings memories too. If that wasn't the case, your family was doing it wrong.
Plenty of kids jam together in a garage, have awesome memories from the school band, or otherwise. Great memories are formed. Or sitting around a camp fire playing a harmonica or a guitar.
If you're learning "instead of" rather than "as a means to," well, there's your problem.
I think a relevant gap you may be underestimating is "if you finish your solder job and it just doesn't work, what now"?
Just getting some melted metal onto a thing is really ~none of the skill cap that makes it "scary", when it inevitably doesn't work, the skill involved in debugging it, fixing the issue (desoldering), identifying if you fried other small cheap components that may need to be replaced, that's really the part that makes soldering a scary skill.
FWIW I think this is an example of a broader class of "being a beginner is much harder than knowledgeable people think"; if you're skilled then you also actually don't make nearly as many basic mistakes to begin including the connection being bad, accidentally shorting, wrong polarity, wrong sized component, and you'll recognize something might be problematic right when it happens. That means you don't even need to do noideadog debugging when a beginner must.
You can probably imagine doing "carefully solder and just fail the project if it still doesn't work at the end" being a strategy that would have a pretty good success rate, when it would actually have a dismal project success rate for an actual beginner.
All of those knowledgeable people were beginners once, made those mistakes, and came out the other side as knowledgeable people. You'll never do anything if you don't start somewhere. This is a fairly simple electronics project, with relatively easy soldering.
I am not sure what gap you mean, since troubleshooting is part of the learning process. If someone expects to always get it right the first time, they are a bad student. Problem solving is relevant to all learning.
What I meant is that the comment said that you can learn soldering in a weekend and described only the physical aspect of getting solder onto some components.
I spent a number of weekends trying to get any intuition over basic circuitry components and how you might debug things and got basically nowhere. I can put some hot metal on stuff but it's not useful if you can't debug and the knowledge needed to debug isn't remotely obtainable in a weekend.
SMDs are not that bad, I always design my boards with SMD components, though I never put smaller than 0805. The chips are even easier to solder once they are fixed at two or three points. I totally abandoned THT elements once I felt confident with surface mounts. I'm doing this with an iron tip, so no BGAs for now (until I turn old toaster oven into a PCB oven).
> may be in the thousands if we take the hourly rate of a tech worker. Flawed comparison, I know, but you get the point.
I get what you're trying to say, but if "tech worker hourly rate" is your metric and "putz around with ham radio" is your goal, honestly, the answer is go buy an off-the-shelf radio for 1-3 TechWorkerHourlyBuckaroos [1]
If the goal however is "tinker with electronics", the relevant metrics are precisely "counting up the mistakes" and "tallying up the opportunity cost wasted at the workbench".
"Why buy this for x when I can build it for x^n" is the motto of any sufficiently-respectful building-shit hobby in the era of global drop-shipping.
[1]: +/- the "ham spectrum requires a test and a license before you can touch it" legaleese
Don’t get discouraged. This is a good opportunity to dabble in each of these areas and this is a project that the author shows will work, so you can follow the recipe. There’s some up-front investment for tools, but you may find it fun and challenging.
You have to get a ham radio license and a callsign to lawfully make bodily contact with a ham radio device. Reading through textbooks and taking tests on a sunday and shaking hands with cellular clones of Gabe Newell and all that.
Allegedly that's easier for some or unbearably gross for some in comparison with soldering.
You only need a ham license for transmitting, not for working on radios or listening
You can learn all these things at your local makerspace, and teach whatever your skills are to give back to the community.
If learning some DIY skills isn't your jam, then maybe a DIY ham project isn't for you.
Nice idea. It would be good to find an AliExpress supplier to ship the whole kit.
I like speech recognition as a feature. Do any other handheld transceivers have this yet?
Very neat project. How are you dealing with FCC certification?
As long as the end user assembles 51% of it, you don't need it. You self-attest that the device is in compliance. You also have to perform an "RF study" but there is no requirement for documentation on that.
Even in Germany, hams are allowed to build their own transceivers. I can't imagine the FCC being more strict than that.
Yes, the whole point of having a ham license is the permission to build and use your own equipment.
The compromise vs "buy some spectrum for 8 trillion dollars" is that you can't use ham radio for commercial (or musical) purposes.
Heh, ask 10 hams what the whole point of a ham license is and you'll get 10 different answers. I've heard "permission to build" before, but rarely.
Heh, I'm not that interested in talking, but I am interested in typing. Especially with the advantage of advanced math/error correction, store and forward, relaying, and related. This adds up to a few watts in a $100 radio getting across a country.
Not sure if you mean building or designing and building. But QRP labs has some nice kits.
I'm an aspiring ham myself :D For me, I'm interested in emergency communications, others in the club are DXers... truly fascinating.
It's a ham project, you self-certify. Part 97 allows you to build your own equipment.
Now, in doing so, you're also taking responsibility for your emissions, and you're expected to be diligent about making sure everything is within the rules. But there's no paperwork or anything unless you want there to be. (Taking notes about your spectral purity testing is probably a good idea, you'll probably never need them, but if someone complains it'll be nice to have.)
The nice part of DIY ham stuff is that you don't, you can sell a kit without any issue.
If it supported aviation bands, I would get it to use as a backup radio while flying. Not sure how far it would transmit though.
Anything aviation-related normally has 5 to 10x cost of mass-market products.
Plus you probably need a licence to transmit in those bands.
If it were an emergency backup you have basically free reign, afaik all the FCC rule parts have an exception for emergency use. The tough part is you'd ideally want to test your backup before the emergency too.
The key selling point is the single power source. Most average consumers carry charging tools for their phone, and don't want to manage another device like a radio.
I personally prefer standalone handy-talkies, but powering them is still a pain. I wish a company would redesign the baofeng to run off of 18650 cells
The UV-9R Pro takes batteries that have a USB-C charging port on the back. I have a couple I setup as my disaster radios because of that and them being water proof(ish, better than other models at least). Programmed them with the local repeaters, weather channel, and the 2m and 70cm simplex calling frequencies plus whatever the default channel setup was.
i have a couple usb-c and though they are better than the previous baofeng, they still don't scale very well, and the battery cells now cost more and are less reliable.
I just want something that takes battery cells.
This would be amazing for backcountry communication - e.g when backpacking with a large group.
Is there any way to enable this for iOS?
I'd recommend something like a couple $25 Quansheng radios instead. More reliability, more range, less finicky, more durable and about the same size as this add-on.
(For some reason the radios are showing as $30 right now)
https://www.amazon.com/QUANSHENG-200Three-Frequency-Receivin...
I own one of these, easily the worst radio I have. Fine for receive but please don't hit that transmit button.
Only N=2 but mine have worked great for the 2 meter and FRS/GMRS bands, which is what one is probably going to use while in the back country.
Definitely don't try 27 MHZ, or perhaps outside of the above bands at all.
Are these Yaesu, Motorola, or Icom quality? No, but they're $25.
Yeah I have 4 that are great 2m/70cm, which is what the included antennas are optimized for. Even better with a cheap Nagoya antenna and non-stock firmware.
Unfortunately people don’t realize that even if you install a firmware that allows down to 11m, even connected to a $1200 base antenna the power output will be in the milliwatt range while throwing off on harmonics.
There’s also the case of hardware inconsistency and fakes. When I hook up 4 of the included antennas to my VNA there’s pretty big variance, and I recently tested a fake Nagoya that was clearly tuned for air band and not 70cm/2m as advertised.
Why? What happens?
Sure, of course, that's to be expected.
Did you actually see the spurious emissions on a spectrum analyser?
The old Baofengs had that problem, not Quansheng which are actually clean and the harmonics are within FCC specs.
Ah, ouch. I have two Baofengs as well, I think they're a bit better, but probably not too much better.
I think it's poor practice for the seller to advertise those simply as a "Walkie Talkie," as that Amazon link does, without making it clear that it is an amateur radio transceiver that requires a license with an FCC-issued call sign to operate. I wonder how many people buy a pair of those and then just start transmitting without quite knowing what they are doing.
Using GMRS requires a $15 license that has no test and is good for 10 years. But nobody ever gets the license. GMRS is constantly full of chatter everywhere you go. Nobody ever mentions needing to get a license. You see YouTubers constantly using and promoting "Rugged Radios" which are just rebadged Baofengs. They are sold by the thousands.
Might want to consider the meshtastic, something like a lilygo t-echo. A few advantages over the standard ham radio:
* Nodes automatically forms a mesh
* works with any android/IOS widget, simple text message like interface
* store and forward means all nodes don't have to be online at the same time.
* Cheap, no soldering, and no ham license required.
* Can use phones GPS, makes it easy to track other nodes
* Don't have to program in repeaters, every node can repeat.Meshtastic(Lora) also doesn't require a license since it's in the ISM bands.
Lora also has really good FEC and other things that make it work incredibly well(at the cost of throughput). Honestly I wish we saw more things like that in the ham bands(other than FT8).
There's a couple Lora radios out there that are USB serial based and can be controlled with AT commands that would let you so something similar if you want to build up from scratch.
This isn't true, it is not exclusive to the ISM bands. You can run it on any band you choose so long as you have a license to do so. Case in point: the ham bands
Sure, that's "technically" correct but most usage of Lora is going to be in ISM since that's where they are traditionally deployed. That doesn't require a license which can be a hurdle if you don't already have one.
I've got a ham license so not a big deal for me but for those wanting to try radios without a huge investment a pair of $20 Lora AT serial radios are a great way to dip into digital radio.
Also, the ham bands as a whole cannot be used for profit-motives or any financial gain. People often forget this rule. Not to mention the (kind of absurd, IMO) rule against any form of encryption.
JS8call is pretty similar to FT8, but can do keyboard to keyboard chat. Not quite auto-mesh, but can store/forward through multiple other nodes.
Decent walkie-talkies are cheap. Cheap enough that I bought some for my kids to play with instead of a single channel garbage radio like I had as a kid. If you really want a cheap programmable radio Yaesu and BaoFeng are the brands most people go with.
Could you point me at such decent walkie-talkie?
I bought these[1] for my daughter. We use them while camping. Range is around 1-1.5 miles in hilly, wooded terrain.
Midland Xtra Talk are the ones I got my kids.
Decent Walkies are FRS blister pack radios now.
> This would be amazing for backcountry communication
At 1W, you'd be better served with little FRS/GMRS radios. Better still, for less than the cost of building this yourself, you can buy ready-made a Baofeng UV-5R for under $20. The antenna is a little crummy, but you can buy that and _still_ be under the $30 build price. Further, the Baofeng isn't supporting a whole operating system so the battery will last much longer. I wouldn't want my "always-on" phone draining its battery until I need to transmit to someone. 1W is only going to be useful to hit repeaters in an urban environment - but because it's 2m (and not 70cm), it's even less likely to be all that useful beyond a neat/fun build.
I wonder how good the range would be. I was thinking that even if I didn't have the appropriate license, having something like this in a pocket on my backpack would at least give me one more signaling option in an emergency. I could deal with the fines later.
Generally speaking, line of sight. Assuming you're in the US, the FCC wouldn't come after you for using this in an emergency situation unless you were being absolutely egregious about stomping on other emergency comms, even then I seriously doubt you'd see a fine.
Having said that you're basically going to need enough knowledge to pass the test to make use of this anyway. Why not just take the test and be legal?
Don't you have to register with your personal address in a public database?
Yes. You can use a PO box, but since all past addresses and changes are visible in the database, you have to get the PO box _before_ you get your very first license, in order for it to be meaningful.
Well, for white pages, it used to be name to phone number lookup, not, you know, physical address, in almost all cases. Yellow pages were different ofc. And the tide against that turned 20 years ago, which congress banned that for cellphones.
In any case, sounds like "yes".
Not a deal breaker, but concerning. I know folks in my home would be opposed to my doing it.
See https://www.n1fd.org/2019/03/23/tape-measure-yagi/ for a upgrade to a 2 meter HT that will make it into a repeater 100 miles away under ordinary conditions and could go 300 miles under extraordinary conditions.
You need to know the squelch keys for repeaters and get some practice, it never hurts to get to know the people who run the repeaters, check in on the nightly net, know who is listening. So it is worth getting the technician license, there is no Morse code, just a multiple choice test run by friendly hams.
One rainy night I was talking to an amateur storm chaser who was reporting on conditions close to the inlet and asking why the repeater wasn’t so busy during storms like back in the day there were lots of storm chasers and I told him that NOAA advises people not to drive into flooding prone regions so most of us don’t do that because we don’t want to become part of the emergency.
Other times in the rain the air is silent but you know there is at least one ham monitoring who will call 911.
That range depends on the height of the antennaes(sender and receiver). I have been able to hear repeaters 150km away because it is on a hill.
VHF / 2m is basically line of sight. But it will go for long distances. I've worked the repeater on the ISS with a 5W handheld radio and a 1/4 wave antenna.
VHF is actually pretty good for non line of sight (at least, better than everything higher frequency).
Its not great for over the horizon communication, but its pretty good at getting through trees and other obstacles.
just get something that transmit on one of the emergency frequencies: https://en.wikipedia.org/wiki/Aircraft_emergency_frequency
so long as you use it for an actual emergency, there are no issues
What other things can I turn my android device into? I've considered using it as a node on my network for certain tasks, and maybe even as a router.
I love it! I have had my technician license awhile and wanted to play with AX.25 networks and this seems like a fun use case.
Or you can just use something like https://shop.sharkrf.com/shop/srf-ose-pro-openspot4-pro-digi... with any mobile phone (Android or iOS) to do talk with any ham operator over the internet (I know, different use case)
Coolest thing I've seen for a smartphone in a while, and definitely the coolest for Android
Afaik illegal in UK without first getting an amateur licence from Ofcom
It mentions needing a licence on the page.
You are correct. You also need to have an Intermediate license as the first level (Foundation) doesn't allow you to build your own transceiver.
> modern ham radio transceiver
Well, let's just leave it at ham radio transceiver
> The radio simply plugs into the USB C port on your Android smartphone and transforms it into a fully-fledged handheld radio transceiver.
When I saw the headline I was hoping someone had hacked the qualcomm modem and turned it into a software defined radio.
yep... in short: it uses an ESP32 with a radio module. The Android app communicates over usb serial with a firmware which is Arduino based.
More accurate: “use your phone as a user interface for a radio module”
but then it's not a click bait
I'm not in the market and clicked the link out of curiosity, but yes, I can turn my android phone into a hair dryer if it takes $35 of auxilary equipement.
I'd love to see that actually... Most hair driers are very power hungry. 2kW is not uncommon (at least here where standard voltage is 240V). Achieving substantial amount of drying from a mobile phone battery would be quite a feat of engineering.
If battery powered, it would be a very expensive device and require a big heavy battery.
Power tool batteries, eg a dewalt 18v drill, allow a max discharge current of around 10 amps. So for a 600 watt hair dryer, you're going to need 3 power tool batteries! Imagine the cost/weight of that!
To make it work without the high cost/weight, you're going to have to blow mostly cold air and hope the user is okay with that.
You could run your hairdryer off an internal combustion engine, probably, I guess? And use the Android phone only for some control functions.
Depends on how re-usable you want it to be....screwdriver and a hammer anyone?
Control via USB/Bluetooth (obviously cloud-based), external power source.
I doesnt seem to be click bait to me... A battery free ham radio I can keep in my glove box seems really useful
I agree that it is an interesting configuration, but I also agree that it is click bait.
The clickbait part is the "Turn your Android phone" bit. Of course you can turn your Android phone into <x>, where <x> is a USB-powered device, for approximately the price of <X>.
The build cost of this (about $35) is very cheap for a ham radio with the features that it has, so "approximately the price of <X>" is what i'm taking issue with here
How is this battery free?
Maybe it is too early in the morning or I am just an idiot but how do battery powered cars avoid the "spicy pillow" problem where batteries swell up?
So just assume your Baofeng battery is also managed. Tada! Two battery free solutions.
Would be interesting to see a USB-C dongle + software version of the Flipper.
> When I saw the headline I was hoping someone had hacked the qualcomm modem and turned it into a software defined radio.
If anybody could do that, that would be a nightmare I suppose.
Such a thing is clearly possible - various debug and calibration modes for these modems make them output the raw I/Q values needed for a software defined radio.
Unfortunately, in a locked down production phone, those modes are unavailable.
I mean, if they could be hacked easily and used by malware then it would quickly become a national security risk.
Turn your Android phone into a garage door opener (with a USB attachment)
Turn your Android phone into a laser pointer (with a USB attachment)
Turn your Android phone into a bowling ball (by submerging it in resin that is then shaped into a bowling ball)
Can't wait to turn my Android phone into an iPhone using this method /s
Nice, but it would be a lot nicer if it could do digital modes like DMR, Fusion etc.
Clickbait:
Turn your phone into X: 1) Start with a phone and X-module-w/o-UI. 2) Make an app with the UI 3) put them together
Can you explain what in this particular explanation is clickbait?
The phone doesn't become a transceiver, it becomes a(n) HMI to the transceiver.
In remote areas with group of people, I have an idea where all phones could linkup like those tesla cars in a mesh-network fashion and then all of them become a loudspeaker.
My only complaint is the framing of it with that title. Otherwise it is pretty cool, for sure!