462 Mhz default baofeng

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dc260
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462 Mhz default baofeng

Post by dc260 »

Sometimes I come across business and leisure activity in the 462 MHZ area such as on 462.125 MHZ.

I notice that on the WTR there exists no allocations in my area on these particular channels. Often times it mirrors that to PMR446-like activity (Shops, children playing, warehouses, businesses, walkers).

So where does this activity come from?

I believe I’ve discovered the source of this activity. It’s the default frequencies programmed into the Baofeng BF-888s radios. These are radios that come preprogrammed on test channels and since these radios do not have a keypad, they must be reprogrammed with a cable

What is occuring is that people are purchasing baofeng radios from Amazon, Ebay and other online stores. They don’t bother to reprogram them unaware they are not allowed to use these channels.

So it’s worth having these 16-channels present in your scanner to listen out for. So far I have heard some children on the channel as well as what appeared to be walkers.

462.125000
462.225000
462.325000
462.425000
462.525000
462.625000
462.725000
462.825000
462.925000
463.025000
463.125000
463.225000
463.525000
450.225000
460.325000
469.950000

I also posted about it on my blog here.
https://decoderstar.co.uk/index.php/202 ... -activity/
My website for radio and programming related topics https://decoderstar.co.uk/
My PMR446 information website https://pmr446.net/
26mb04
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Re: 462 Mhz default baofeng

Post by 26mb04 »

That's useful, thanks for the info. These 888's are used by some of my clients, I've often wondered where they are as they're not on 446. You can narrow down these Baofengs because of the very low CTCSS tone on de-key which (IIRC) can't be disabled. The tone actually disables the rx circuit in the radio, so you could, in theory, perform a DoS attack on Baofengs by using a suitably low (custom) CTCSS tone which Inhibits All The Baofengs.

It'd be interesting to see what Ofcom think of these, and whether they plan to take any action on them. As you say though, Most People assume they're legal, and probably like the fact there's almost no interference! My local storenet uses them, albeit on their licensed system.
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paulears
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Re: 462 Mhz default baofeng

Post by paulears »

They don’t disturb essential services and as you say, they’re usually used like pmr446. My feeling is ofcom don’t see them as a problem. You found this by luck, not interference. The police know the exact time your car passes the number plate cameras. A bit of maths would enable every speeder to get a fine in the post, but they don’t do it. Baofeng 888s come out of the factory in huge piles and get shipped everywhere. Customs in each country could open the packages and test them, but they don’t. The cost would be frankly, pointless. Ofcom s network of receiver DF stations no doubt reveals users close to the sites, but it’s a paperwork problem, not a real one, so is very, very low priority.
dc260
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Re: 462 Mhz default baofeng

Post by dc260 »

26mb04 wrote: 08 Oct 2021, 17:21 That's useful, thanks for the info. These 888's are used by some of my clients, I've often wondered where they are as they're not on 446. You can narrow down these Baofengs because of the very low CTCSS tone on de-key which (IIRC) can't be disabled. The tone actually disables the rx circuit in the radio, so you could, in theory, perform a DoS attack on Baofengs by using a suitably low (custom) CTCSS tone which Inhibits All The Baofengs.

It'd be interesting to see what Ofcom think of these, and whether they plan to take any action on them. As you say though, Most People assume they're legal, and probably like the fact there's almost no interference! My local storenet uses them, albeit on their licensed system.
I never knew that about the CTCSS tone on dekey that is quite fascinating, I will have to do testing to see if a DOS attack would be possible on the Baofengs...

I very much doubt they will take action as ofcom acts on a complaints basis, since there exists no active allocation near that area at least in my area no complaints would be received and ofcom would not act. However I still would not use these channels myself..
My website for radio and programming related topics https://decoderstar.co.uk/
My PMR446 information website https://pmr446.net/
dc260
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Re: 462 Mhz default baofeng

Post by dc260 »

paulears wrote: 09 Oct 2021, 07:23 They don’t disturb essential services and as you say, they’re usually used like pmr446. My feeling is ofcom don’t see them as a problem. You found this by luck, not interference. The police know the exact time your car passes the number plate cameras. A bit of maths would enable every speeder to get a fine in the post, but they don’t do it. Baofeng 888s come out of the factory in huge piles and get shipped everywhere. Customs in each country could open the packages and test them, but they don’t. The cost would be frankly, pointless. Ofcom s network of receiver DF stations no doubt reveals users close to the sites, but it’s a paperwork problem, not a real one, so is very, very low priority.

You are right, they do not cause interference so they have no reason to go after these people.

Oddly enough I am starting to doubt their remote DF systems efficency, this is because of the case a few months ago when a lunatic was interfering on the marine band making hoax calls. It took them three weeks to track said abuser and they even mention in their own report on the case that they deployed localised DF equipment to help locate said abuser If the remote DF system was as effective as was described on this forum before, they could have easily located them within a few transmissions.. Although I could be wrong on all this, its just my view.
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My PMR446 information website https://pmr446.net/
paulears
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Re: 462 Mhz default baofeng

Post by paulears »

I don't think they're in the right places for marine band are they? They seem to be localised in the cities and urban areas with high radio traffic. I live on the east coast and marine coastline from the wash down to Essex doesn't have any monitoring I'm aware of - However, channel 16 is covered well by the DF outstations that give Humber Radio the location of ch 16 transmission, so inland transmissions can be determined quickly. In the case of the hoax above, the Coastguard system would localise it to what, within a mile or so, because it doesn't need that kind of accuracy at sea, so OFCOM would have to get a couple of people in to drive around, and presumably that, with few staff, is a difficult logistical problem
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bigpimp347
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Re: 462 Mhz default baofeng

Post by bigpimp347 »

Locally several frequencies are owned by people, but many are pirates using cheap Baofeng radios..

they also hate you giving them abuse and claim to phone the police and all sorts..

until you ask if they have a licence to be using the frequencies they're on then they soon shut up..
Ofcom will only take action if a legitimate user complains, as they who hold a licence can pay thousands a year for a frequency, so they will work for their moeny.

but generally, no one cares..

i've even heard local Amateurs on 146Mhz which is legal if you hold a proper licence and an NoV but majority don't have NoV's and just go there out the way.
but again, no one cares..
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troffasky
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Re: 462 Mhz default baofeng

Post by troffasky »

Does anyone know if the Bumfeng Band is actually "license free" anywhere in the world? A couple of them coincide with FRS channels.
Googling them comes up with discussions about them being the defaults, but that's about it.
They seem quite generously spaced apart to be a "real" band plan.
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