Pushing These Secure High Frequency Radios To The Limit!
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- Опубліковано 18 жов 2022
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Love your creativity and research!
I think you invented the "ham radio tourism" industry. I'll check out some of those sights and towers next visit I have to the UK.
Thank you so so so much! You’re too kind. I really appreciate that!
I've pushed the DTR650's (900MHz @ 1W) out to just over 14km. But more important to my application through 18 stories of a concrete building, well into underground parking garage. That's with the add-on longer antennas, not the stubby antennas that they ship with. They've been a very good radio for our building emergency team.
Be interesting to see how these perform in a city or suburb. Fabulous audio quality 👌🏻
Surprising outcome, i would like to see these tested in a built up area, always looking for better performance on building sites.
They don't work at all well in a built up area. I have the same radios. At ground level I left one at home and walked 2 minutes up the road and it already stopped working. The higher the frequency the more it is blocked by obstructions. With mostly line of sight I got a decent range. I can't remember exactly what it was now but I posted a range test video.
@@radiosification It's then worse than 400-470MHz radios. What frequency is it using, 1-2.4GHz?
@@dare-er7sw yes, much worse than 400MHz band radios for getting through obstructions. They're using 2.4GHz.
@@radiosification HaHa, 2.4GHz is WiFi territory. Too bad. There are small VHF/UHF 1-2W analog transceiver modules available, one can easily build a homebrewed walkie talkie with privacy by adding a 40KHz subcarrier and modulating the subcarrier with FM voice.
Remember… the higher.. as in legitimately higher than were used to frequencies like above 5-6ghz are blocked more by buildings.
WHEN. Will people learn that lower frequencies go through buildings better lol if you want good range, get a good 900mhz model lol or a lesser used band. Those 2.4ghz antennas are near the Wi-Fi bands so you want to avoid. Same with 5 and 6. Look for odd frequency bands
I have been following Andy‘s channel for a while now and have also been watching quite a few of your videos I particularly enjoyed your recent video about all the different antennas aerials and dishes attached to the tall transmission tower I have often wondered what all those devices were about and I have also enjoyed all your videos about the early days of UK pirate radio, good stuff mate keep it up
I imagine these would work fairly well in a fixed installation LoS scenario with just a pair of cheap old 2nd hand Wi-Fi Yagi antennae. Or perhaps even better with parabolic grids or solid dishes.
I can't find this on Amazon. But it might be possible to buy them somewhere. The range at 2,4Ghz is quite large with the right hardware. I am often seeing under the right conditions WLAN points that are up to 5 km distance from me.
I love your test of these radios. Amazing test with such low power on a very high frequency. Great Job,l
Love to see tests of different radios and bands I some times do myself.
Thanks for the Video.
Very good results. Looking forward to an even greater distance test.
I've seen these Motorola Gigahertz radios several years ago. The only ones available in the U.S. are in the 902-928mhz ISM band, 1 watt. Several models ranging from 1 channel to 50 or more. I still have a pair of the old TriSquare 900 radios and got excellent range, better than GMRS at 4 watts
I also had 4 of the Trisquare radios. They were great but I had two problems with them. First, they went through batteries quickly. The second problem was if you had three or more on the same channel, they wouldn't stay synced.
By the way Lewis, we have a lot of movies over here about Sherwood Forest, if you’re going to do a test in a wooded area, most of us are familiar with this one. Thanks again for all you do.
Nice video Lewis good to see you operate on 2.4 ghz
This is the first time that I have heard these radios. Thanks for the video
My wife and I are using the Retevis RT10 900 MHz ISM here in the US. They are great radios for short range secure (as secure as you can be using radios). They don't do FHSS but they are DMR with encryption.
@blankreganon5395 do you need a license to use?
No license is required for ISM. They are limited to 1 watt. Amateur Radio shares these frequencies on a secondary basis. If you go over the 1 watt limit, you need to have a ham license.
Funny story about Motorola radios. I was assigned one with a bad battery which almost started a prison escape protocol with me being the escapee. As a loner type it was nice knowing I had a bunch of people rooting for me but I was short time, 16 months, and more importantly I was clean and never trusted a doctor again.
Another good video Lewis. They're very fun radios to play with those ones.
Great to hear from you Ben
Great video Lewis , very interesting what you can do with these on right conditions and set up . Regards mark
When you coming back on the radio ??
Ringway Manchester I love your video so much keep up the good work
❤ thank you. love your content.
Great Lewis, can’t wait to see these used in wooded areas.
I pedalled up that hill from Burnley last month Lewis, a lovely spot, although your video didn't capture the noise from the pipes!
Great video, thanks for putting it up. It has similar audio as DMR, so not bad on that point.
Can you use more than one HT at a time?
I am disappointed that you used 'high frequency' in the title, this made me (and many others I'm sure) think this was a solution on the actual HF band.
Amazing range for the frequency hopping in use etc,quality Lewis.
It's strange that the 900mhz varient available in North America is a full watt but these are only 100mw, it would be very interesting to see the range possible in 2.4 with more power
have you got an OFCOM simple business license?
you can use 5w and encrypted DMR, Anytone 878 offer AES256 but from 32 preelected keys from memory. I wonder if someone could edit the hex and select their own encryption key 🤔
The Anytone 578 mobile unit can track the handhelds bearing and distance from the APRS (also does crossband repeat and can cross channel repeat on DMR with a different talk group) so it would create an interesting extended encrypted network Expensive experiment but interesting!
Personally I have the Motorola DTR 650, 550, and 410 and they work great around the city! I can get about 1.5 - 2 miles around a dense suburban city here in California. I often hear a lot of businesses and warehouses use these radios. I haven't seen how far I can push my radios in my area but for sure it's way better than FRS radios in the U.S. compared to these license free digital radios
Oh it's ON!!!😜
It might be interesting to try a two way from Burnley to Wards Stone south of Lancaster - but Wards Stone is a heck of a climb!
Interesting test. Look forward to seeing more on these.
Amazing results 😲
Thanks . Watching with my UV5R in my hand
Another great vid and good luck to the winner haha... Andy's going up the Shard to get a little bit higher 😁
Good video Lewis Grid Antenna would be good 2.4GHZ I use for wifi
Nice job!!
I had a pair of these about 15 years ago. Great functionality. Unfortunately they only managed a few hundred metres in a built up area with the standard antenna, so I got rid.
The voice encoding has that distinctive LPC (Linear Predictive Coding) sound to it.
I've got line of sight to my parents' house which is about a kilometre or so away
If I ever get a hold of a pair of these, it would be a fun project to set something up
I wonder what type of repeater could be made, utilizing a pair of these with different talk groups, linking the audio or talk path between the two units, and utilizing ISM Antennas with some gain? Ideally, you'd need 4 radios, with two 'earmarked' for the repeater. Obviously, some type of controller board would be necessary, in order to provide the interconnect between the two units, but I could see this extending the units range considerably. Add a Telco connection, for remote access. These would make good, secure control links as well.
@@cappicturesinc.4597 I'm glad to see there is a commercial solution. Although, at that price, I'm almost thinking the interface & two radios would be cheaper.
@@oliverw.douglas285 For sure, it just seems like a lot of work.
@@cappicturesinc.4597 Since I have limited hands-on experience with these radios, I'm speaking from more of a conceptual perspective. Theoretically, they could probably be interfaced through a very basic bi-directional repeater controller, which cross-connects receive audio from one radio, to transmit audio of the other. Obviously, the audio levels would have to be set to proper levels, to avoid overdriving or clipping. Beyond that, some sort of carrier-on or active channel detection would need to be brought out of each radio, along with the PTT or Push-To-Talk, to activate the respective transmitter, at the appropriate time.
I apologize if I made it overly complicated. If the necessary connections from each radio, could be brought-out, & made accessible, I think a basic repeater could be made, utilizing two separate talk groups, with two 'donor' radios for the repeater. I think it would be an interesting experiment either way. :)
@@oliverw.douglas285 Ah I see, that could defiantly work. Don't worry about it, sometimes thinks need to be explained that way :)
when using the radio,do you use by the line of sight ,then how do you manage to overcome microwave and other equipment that use 2.4Ghz
It is security by obscurity and by using uncommon technology. There is no encryption.
As much as I understand - this makes your communication much private and much secure (but not fully), and still remain legal. Nice!
Motorola support AES encryption in DMR, in my opinion this only one fully secure, common solution (AFAIK - also Anytone DMR radios support AES), but in many country there is problem with using encryption fully legal, even with ham license.
I am wondering if there is something I can use as replacement for a DECT phone, if I have IP WiFi available? They are mostly used as family intercom. Some wifi SIP phone and make local Asterisk server? Is there something more simple? Like DECT but over IP or something?
Very interesting!
My daughter told me some years ago that she could sometimes keep hold of my home wifi signal on the bus to school, for up to about 3/4 of a mile.
Line of sight makes all the difference, and it's a dead straight road from here to her school.
Love this theme :)
Interesting demo
Great Video so an sdr of any kind with the right software can’t pick up the transmission from one of these radios ?
That’s correct
Great video Lewis and Andy kirby content..
Lock down your aerial , you're listening to the streets . Illegal pirate material lol
I wonder how long range you could do using for example a 1.2m sat dish and a helix on each end.
2.4 ghz will travel as far as the curve of the earth will allow, the issue you may hit is timing, they are TDMA and the increases RTT delay may cause them to stop working.
looks like a great place to test PMR.
Military aircraft have something similar they call it Have quick
1-9 for a rig check 👍
2.4 gig frequency hopping ( spread spectrum ) sounds like a more powerful version of the army personal roll radios .
Are you sure it's legal to use the antenna shown at 2:10 ?
Nice
Excellent
73 M7TUD
How would this radios work if you had 1W or 5W output? About a 70Mhz range? Love you and Andy's vid's!!!! The best from LB1NH in Oslo! 🙂
No way it would be comperable,2.4GHz is more or less los in any real distance.whereas 70MHz is "almost" like CB/28MHz,propagates really well even beyond los.
And we haven't mentioned Es yet.
@@joczo97 Yep, there's a reason these frequencies are used in microwave ovens, they tend to turn to thermal energy upon contact with 'stuff'. Up to 450Mhz works ok, penetrates objects and can propagate beyond raised terrain reasonably well. 🙂
@@joczo97 "E"s are good, "E"s are good...
TriSquare also had FHSS 2way radios on sale across the USA and were fairly cheap but the technology was secure. Sadly they went out of business in 2012. They were cheap, on the GMRS 900Mhz frequency so no licence needed. Downside they couldn't 'talk' to any other radios.
Those things were pretty cool for what they were. AFAIK they used plain analog modulation combined with relatively slow FHSS (both unlike these Motorolas), so listening in probably wouldn't be that hard if you know what you're doing. There's a video on YT of someone doing so using Optoelectronics gear. Still a lot harder than plain old FRS/PMR446, though.
The speaker mike audio is pretty tinny. Better from just the radio itself.
Hi I'm looking for some help, Can you go anytime you wanted to reach out to people or is it preferred to only do it at 8pm on a Sunday. Sorry if it sounds like a silly question I'm new to this. Also do I have to do anything specific or do I literally just go onto channel 8. I have the RB615 and RB617.
Whenever you want mate :)
@@RingwayManchester I'm from Oldham so I'll try up on werneth low you seem to reach a few people up that way.
Drop me an email, we can get on the air sometime for a test. Ringwaymanchester@mail.com
Does anybody know another handheld radio for 2.4 GHz? Couldn't find any.
Imagine what 0.5 Watts would do or even 4 Watts? You could be talking to someone across the channel.
👍
Oh No, Roydon must have had to changed his callsign from M0VHF as part of his on going rehabilitation and recovery from radio addiction !🤣At least he has progressed in his recovery.
👏👏👏👏👏
2.4ghz is like the worst band to be using portable radios on. I dont know what motorola were thinking. Anyhow if you use a pair of parabolic dishes you should be able to get 10kms easily. Remember to keep the antenna cable between the radio and the dish short as you loose a lot of signal over a few metres of coax cable at 2.4ghz.
Do you need a license to use in USA?
Does this radio interfere with home Wi-Fi? My Mum and Dad used to lose Wi-Fi every weekday at around 17:00. Turns out it was the chap next door getting home and putting his meal in the microwave!
No more than any other wireless router would
Hei, I wonder if Dji can make a communication radio one day. I fly drones and there wifi signal has a range of over 3 km with video, flight data, battery info and gps. And that's European mode. On American UA-cam videos, I see that they manage 10 km regularly. Imagine if they wanted to make radio?
That range is line of sight.
Any radio will do 100km or more with line of sight
@@jplacido9999 yes, just like in the video, 100mw 2km
@@darkokelava4754 if you test a regular pmr446 or FRS portable, they will do dozens and even hundreds of Km once their have perfect line of sight...
Only when propagation is particularly bad the range will be less.
👍👍❗❗
It's a shame england doesn't have the same radios the rest of the world has. I got 300+ miles between 2 Uniden Pro 520 CB radios. One, a land 1/4 wave homemade wire, and one, a marine whip on a sailboat. 1/4 watt FRS radios? 7 miles ground to mobile radio shack units.
Is that strictly line of sight, mountain to mountain top?
@@rawcado Almost, in the case of FRS radios. The higher the frequency, the less the wavelength will bend or penetrate foliage.
They are some cool little radios. I am not so sure I am a fan of the compression they are using though.
What about having 2 laptop and wlan routers and hosting a teamspeak server
What about it
If you can get a alfa on there my yagi should and I have multiple alfa networks that are not as good in comparison
2.4ghz, that's very short radio waves which are good for urban areas, a similar frequency to mobile phones I believe.
How about gmrs radios
Lewis knows! Separate mic so you ain't holding microwave oven frequencies next to your head
Any commercially available system isn't really secure ;)
Andy's a great guy but he's No Ringway Manchester :)
Just teasing Andy!
👀
What are the radios that dmo deejay uses? he said they can be used worldwide. or was he just chatting shit
uh-oh M3's cant use the 13cm band!!
Uh-oh these are licence exempt. Come on, do your homework before posting silly comments…
@@RingwayManchester is is what happens when my uncle uses my UA-cam lol, Apologies Lewis. I SHALL CORRECT HIM. Typical G stations 🙂
Ok 👍🏻 😂
Horrible audio
What's the point in these radios... Or am I missing something? 🤔
I guess it's for people to talk to each other?
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