Digital scanners

Talk about radio and non radio stuff in here, a place for Genral Chit Chat

Digital scanners

Postby pickuup333 » Mon May 13, 2019 6:10 pm

Forgive my lack of knollage , do digital scanners ie uniden 3600 xlt pick up mobiles and police
pickuup333
 
Posts: 1
Joined: Thu Mar 28, 2019 4:50 pm

Re: Digital scanners

Postby mhm » Mon May 13, 2019 6:14 pm

The police went to airwave years ago and they are encrypted so the answer is no.
The mobiles I have no idea what freqs they use today but my scanner has not picked up any

Going back in time this is the man who had the police move to an encrypted set up http://news.bbc.co.uk/1/hi/uk/2065342.stm
Whistler TRX1, Uniden 396T, Icom R5,TSC100RA, Yaesu FTA-310
mhm
 
Posts: 23
Joined: Sun Oct 14, 2018 9:01 am

Re: Digital scanners

Postby thelad » Tue May 14, 2019 6:38 am

Simple answer is No not in the UK, things like shopwatch that are linked to the police may be picked up but thats around it. The main system used in the UK is Tetra and not a mode of "Digital" that the 3600 can decode.
thelad
 
Posts: 1213
Joined: Thu Dec 06, 2012 9:30 pm
Location: Uk, Yorkshire.

Re: Digital scanners

Postby Minus1 » Tue May 14, 2019 7:32 am

You can't listen to most TETRA signals as they are encrypted.
You can detect them. Base 'TMO' transmissions are between 390.1625 and 394.7875.
Depending on your receiver, tuning slightly off the real frequency may help. (On Uniden analog receivers try 6.25kHz above the real freq)

Air to Ground (AGA) 394.8125 to 394.9875, channels are 25 kHz wide, offset by 12.5 kHz. Base stations can be some 40 miles apart.
(The lowest 33 TMO channels also seem to have some AGA functionality, but this is not well known. They possibly fill in gaps in the main AGA coverage.)

London also uses 420.0125 to 421.8625. Again mobiles are 10MHz lower.

There are some kind of data/telemetry signals at 421.8875 to 421.9875, which I have never managed to track down.

There are six 'DMO' point to point channels 390.015 to 390.1375, but it is so rare to pick these up that I never have. Probably depends where you live. Less likely to be used in urban areas with good coverage, more likely in hilly rural areas with poor base station TMO coverage.

Most sites have two frequencies, though can be up to 8 in busy urban areas. Mobiles are 10 MHz lower. More diffuclt to detect mobile as they only transmit for 1/4 of a timeslot, so most scanners miss them most of the time. You can see the transmission bursts on a SDR waterfall.

I've never got Close Call hit of a TETRA mobile signal (even when a police car stopped a car opposite my house!).
Occasionally get a Close Call hit on a TMO base station, but it's not always the right frequency, as the scanner is not designed to detect TETRA signals.
I reserve the right to ignore people who have made no attempt to the read the manual, and expect others to do it for them.
User avatar
Minus1
 
Posts: 940
Joined: Fri Jun 05, 2015 8:17 am
Location: West Midlands

Re: Digital scanners

Postby Minus1 » Tue May 14, 2019 7:36 am

mhm wrote:Going back in time this is the man who had the police move to an encrypted set up http://news.bbc.co.uk/1/hi/uk/2065342.stm


Not really, it was far more to do with hysteria incited by the "great British press"; coupled with a dictat from the EU (TETRA is now used by emergency services across the EU).
I reserve the right to ignore people who have made no attempt to the read the manual, and expect others to do it for them.
User avatar
Minus1
 
Posts: 940
Joined: Fri Jun 05, 2015 8:17 am
Location: West Midlands


Return to General Discussion

Who is online

Users browsing this forum: No registered users and 2 guests