Seriously mate your content has been getting better and better with each episode!

Brilliant info as I use radio on my boat so very handy info, also love the music at the end, nice one. My Family used to run and repair radios and receivers, my dad who is now 86 still messes about in his workshop making / adapting old stuff into newer stuff and is a legend.

Don't know how I ended up watching a video on radios but I did, and I did watch it all the way through. Then I noticed the closing music wasn't stopping, then I remembered the synths in the background, great job, really liked it! You should have kept that going instead of the fade.

Like the Spectrum analyser you got there might think about getting one myself. Great streams you do Andy keep them coming

Good info Andy, thank you for the demos. Cheers from Utah

One person's difficult to detect is anothers ability to not only find the signal regardless of hopping, but also recognise the RF signature of the particular radio!

Fantastic video thanks Andy i did have a pair of them radios frequency hopping spread spectrum fantastic radios till i sold to Lewis in Manchester he had a pair of me about 2 yesrs ago i used for bike rides with the kids so no-one could hear them on the radio as was just playing safe back then 😀

Andy, I'm a ham myself but also dabble a bit in music production and I'm interested in hearing about your music background. Maybe a tour of your studio and what tools you use like the DAW etc. Cheers for the effort you put into your vids.

Started using the DTR650 and DTR700 last year Apparently, it's up in the ISM Band. Same frequencies that some medical devices use. Most businesses around here are using the default profile and channel so they can be pretty easy to find. If you looking to listen to some or your local businesses, these radios are great a cheap little scanner

Awesome video!

I like what I hear on RTL SDR. I have version 3, and version 4 is on the way. I listen to 10 meters amateur now being good a lot, Amateur Repeaters, and broadcast FM too. I just saw on Tech Minds KZfaq about RTL-SDR 1090, for aircraft tracking. 😊

Same with US versions DTR 410, 550 and 650. These are less than $100 used. The newer 600 and 700 versions cost more but just have more channels. Frequency hopping spread spectrum 90ms hops in 50 channels with private text and digital voice.

Here in Australia, my cordless house phone (3 cordless 1 base) works exactly like that, on the wifi frequency, frequency hoping, and all that. Purchased in 04. They first showed up in late 90's. Luvin that beat man👍

I use the Bowman Marconi PRR radios which operate in a small segment of the 2.4 GHz band as well. Have assembled adapters that allow the use of other types of headsets. They seem to be immune to interference from other equipment utilizing adjacent spectrum in the 2.4 band but these can shut down Bluetooth and WiFi signals within several hundred meters. Quite efficient as squad comms for us in Uncle Sam’s Misguided Children’s 12:34 units. Looking forward to the new units that are encrypted and frequency hopping as well. There were plenty on the market about a decade ago so I invested in these as spares for my unit out of pocket, been a lifesaver. Sealed units, rugged, not that small but one can effectively hide the transceiver in one’s pack while routing the antenna on an extension onto the top of the pack or higher topped with a high gain 2.4 GHz antenna. The common router antennas require an adapter that goes from a reverse sma to sma in order to work with these antennas but there are commercial suppliers in the States that will do a custom order for government work supplying +6db gain antennas if bought in bulk with the proper connector installed for these radios.

Hello from Cape Town!

I absolutely love the description of the Chinese radios on ebay and Amazon. It cracks me up seeing the creative and totally stupid things the sellers claim. Stealth comms.... Untraceable... Encrypted... Invisible... And so many more descriptive things lol

Andy, I would be curious to see how the frequency hopping radios range would increase or compare with using the stock antenna vs. an after market antenna with some gain. Art. K2ADC. Thank you for the great videos.

Such a good video ...... So I bought two units! Thanks 😀

really enjoyed the video

Is good information about this radio.. thank you very much..i hope you can share more information for the future 73..

There are also Motorola DLR radios which operate spread spectrum on 900 MHz and would also be undetectable. I believe they are not discontinued and still available for purchase. 900 MHz would also propagate better than 2.4 GHz

I equipped a high-rise building emergency response team with DTR-650's (900MHz ISM here in Canada), and they worked spectacularly through over 20 floors and down into the parking garage. We upgraded to the slightly longer whip antennas. In free space, from the 20th floor, we easily reached out 13km (and could have went farther). Highly recommended piece of tech.

Tune at the end Andy lad🤜👍

amazing video and radio, sad it's not around anymore. thank you

Have a sub. Just getting into all this and I like your style.

I can certainly see potential in these.

Wow, neat content. I had one of your videos pop up on my YT feed the other day. It was good. Now, many of your videos are in my feed, as to be expected. But that's ok. Subbed, and looking forward to new videos. I'm a retired auto mechanic in Alaska, USA. Looking for a new hobby to keep me busy. The content on your channel is intriguing.

I use a couple of Motorola DTR 650 hand sets..A bit naughty here in the UK but they work extremely well..

They are very simar to our DTR radios in the US, though ours are on 900MHz ISM band. Question: Are they capable of DMR and encryption? The beauty of US regulations on 2 way in the ISM band is not only the FHSS, but you can use DMR. Output is limited to 1W but that's fine for close range groups. But encryption is also allowed on these radios. Encryption is something of a hot button issue in the US as NO amateur or license free band is lowed to use it, except ISM. Only commercial/public safety can use encryption other than on the ISM band. Just curious if it's the same over there.

The dtr in the US used a lot of 902-928 ism band in the US which was assigned to cordless phones and baby monitors etc. we have some data radios aka 900 MHz wifi, but it is mostly amateur radio use now

Good vid. Like # 556. As an American I like 5.56 ;) Wonder if other radios still in production frequency hop. (for civilian use.)

I grew up near Motorola ... On a Different Note--- I remember when they created the 1st Vibra-sender System and The Elgin Police Department was one of the 1st to try it

FHSS is one of the first ways people have devised how to avoid signal jamming. It's just that there aren't many civilian applications. If everyone used frequency hopping, they would accidentally overlap frequencies sometimes, also there are laws against doing these things depending on the country.

Tested those Motorolas in hydro tunnels in Scotland about 10 years ago. UK version is 100mW, US version is 500mW, but Moto UK wouldn't agree to import them. They propagate all the way to the noise floor in tunnels - waveguide effect. We got a couple of km out of them underground. The 4m and UHF radios we were testing in parallel went nowhere. Nice radios. Pity they don't make them any more.

Years ago I bought (in Canada) a pair of SS radios from Trisquare. I believe the hopping sequence was not changeable, so you had to buy a pair. I don't remember the frequency band and I always wondered f they were even legal in N, America. 73

Hi and Thanks for the video. But what is the make a model number of your little power metre. I hope you can share this with us and do a review. Geff

I'll sit there with an SDR and then tune into their PMR channels, say hi to local business lol

We used Motorola PMR 446 radios at work and my boss was always swearing and a school teacher at a local school who also used PMR 446 somehow managed to get her radio on the scanning function and she was picking him up and the kids were hearing the swearing . she then got on the radio to tell him to stop swearing. I did tell my boss other people could here them but he did not listen to me.

are there any multiband receivers which give good results in a low to ground location without the possibility of an external antenna?

Meshtastic uses LORA which is a lower frequency than WiFi and also uses a hopping technique. I use on 915 Mhz with a 160mW output in Australia. Encrpyted channels can be setup and every Meshtastic unit is a repeater. Text based only comms. I'd like to see you do a review.

You say about the PMR radios and how people use them giving no thought that people can hear them, I had to point this out to a local school a while back. They were discussing all sorts of private things over the air and they had this idea that nobody else could hear them, I scanned for the CT they were using so I could transmit to them and pointed out that every man and his dog could hear what they are saying. I got a response that they had set a privacy code so how could I hear them or transmit on 'Their' channel (lol) so I had to explain that manufacturers of PMR 446 radios should not be calling CTCSS privacy codes as its nothing of the sort and had to explain that all it does is make their own radios ignore other radios on the same channel which dont have the same CT code set but that a radio with no CT code set can hear all other radios even if those radios have a CT code set and only need to know it to transmit to those radios and even that is trivial to scan for. Funny how the nature of how they talk on their radios has been very different since I explained this to them ha ha.

So I'm new into radio/comms...but I see everybody with the TinySA Ultra, is it really worth the $150? Or are there more budget ones in with similar features? Justing trying to gauge how essential it is

Are there any walkie talkie systems using Code Division Spread Spectrum?

Hey if I buy one of them tinySA spectrum analyzers do they come already programmed / set up to read all Those frequencies? I’m trying to find out frequencies of some different rfid locks I have . Maybe you can help me with that answer

I have some discontinued uniden scramble 22 ch gmrs radios.

Hey just a suggestion for future vids. If possible, could you please put the names or details of all the hardware you use during each vid in the description? Not like a whole spec sheet or anything but maybe just the names or an Amazon link? Trying to look at that Alfa antenna but the ones I keep finding are the RP-SMA and I thought the TinySA’s were regular SMA. Is the antenna actually an RP-SMA and you’re just using an adapter? Any info would be appreciated. Thanks.

Cool radios but even your frequency hopping radio is detectable and trackable with the right equipment.. and it is easily available at a cost of ~£1000 on the open market. There is no such thing as completely secure radio but just radio that needs more expensive to equip for.

interesting video! but prefer to talk about CB and Pirates for example where they sit, countries, frequencies etc... it should not be a combination of digital computer internet connection, None of that counts because you might as well call with your cell phone... Healthy and Friendly Greetings from the Netherlands! Rob (RadioRob)

Bluetooth RF looks similar (hopping around).. try an SA with max hold.. I have a pair of kids digital 2.4GHz walkie-talkies (Dickie) Interesting vid Andy, thanks!

If it produces RF it's detectable the more covert your comms the more of interest to Intel agencies

so despite how hard it is to intercept the signal the 2nd radio does it flawlessly so can others. safe? I don't think so .

Nice apocalyptic prepper radio. thanks

Any other sites for radio frequencies all that come up are radio frequencies Uk. struggling to find much i north east England thanks all

I haven't, but now I want to.

the state can listen to the mobile phone with special radios

What’s the model number of the moto DMR radio you used?

are these frequencies license free ? or do i need a business band or ham license ?

Perhaps the hobbyist equipment can't readily detect/decode some of these devices, but the professional/government spectrum analyzers and other equipment certainly can...

Meshtastic is the same thing hide in the noise of wifi

Name of outro song please?

And wgat about TETRA system that use Motorola , 80% of the police law enforcement and military uses them - they have sim card,can be used as mobile phone,terrestrial trunked radio,radio to radio-direct,and mutch more,it is ILLEGAL to bye one as a civilian

50 - 100milliwatts? What is the range on that? 1/4 of a KM ( 1/10th of a mile?) In NYC that is 2 block? That is pretty usless. Especially with the radio noice NYC has in that area. That is no better than shouting across the distance. It maybe great if one lives in a 1000acre farm but who lives in a 1000acre farm? Wifi is about that that much power, how far can you take your laptop away from your wifi? Other end of your house before it disconnects? Back in the 70s we used to have these kid walkie talkies that were on various frequencies including CB, but at 250milliwatts. The range on those things were about 3 NYC blocks, I would guess 2/5ths of a km or a 1/6th of a mile. I think those radios were a failed experiment and that is why Motorola dropped them because they could not justify their cost to their short range.

Nothing is 100% secure.

umm that DTR2450 is 900 MHZ spread spectrum NOT 2.4 gigs bud!

This guy will kill the scanning hobby altogether.

Need a litte more Hardware (FPGA Accalator) & Software for mobile Signals Sim Card And keys images So can make a Clone sim card The FPGA RHS Research Xilinx Artix-7 FPGA M.2 Development Board (A200T FPGA/1GB DDR)

No but i had heard of it. Those are pretty pricey units.