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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Exploding pagers
Date: Mon, 23 Sep 2024 07:29:58 GMT
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On a sunny day (Sun, 22 Sep 2024 15:04:39 +0200) it happened "Carlos E.R."
<robin_listas@es.invalid> wrote in <78h5skxljq.ln2@Telcontar.valinor>:

>On 2024-09-21 18:55, Clive Arthur wrote:
>> On 21/09/2024 16:21, john larkin wrote:
>>> On Sat, 21 Sep 2024 10:21:11 +0100, Clive Arthur
>>> <clive@nowaytoday.co.uk> wrote:
>>>
>>>> On 20/09/2024 19:05, john larkin wrote:
>>>>
>>>> <snip>
>
>...
>
>>>> I do wonder how the walkie-talkies were set off.  Would they have to
>>>> include some GSM circuitry?
>>>
>>> Just a pager message, probably.
>>>
>> Do walkie-talkies generally have that facility?
>
>There is a kind of walkie talkie that works similarly to GSM. They need 
>repeaters, even a repeater network.
>
>That way a policeman can talk to any other policeman or fireworker or 
>ambulance driver in the city, or the entire region. In privacy if 
>desired. And without fees.
>
>I don't know the name of the system.

Being a radio-ham, I have a Baofeng 2 way radio.
At 70 cm wavelength there are several country wide networks.
Some need a special code to transmit to it.
Baofengs are cheap on ebay.
 https://www.ebay.com/b/Baofeng/bn_21820271
Not sure which ones have the explosives.. ;-)
Mine is still working after many years...
 https://www.rtlsdr.nl/uhf-repeaters-430-mhz/
you need a license to transmit..
Is also used by truckers like 27 MHz was long ago here...
The networks can be used as emergency service if needed.
 https://www.buytwowayradios.com/blog/2016/08/how_to_manually_program_the_baofeng_uv-5r_from_the_keypad.html

There is a lot more to it...