31.037 MHz - 31.212 MHz (CT1; CT1; CT2 and DECT)

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31.037 MHz - 31.212 MHz (CT1; CT1; CT2 and DECT)

Postby Davie Boy » Sun Nov 01, 2015 9:37 pm

Hey all... want to thank you for a very informative and useful scanning directory.

So... looking at the main file (MAIN UK SCAN DIRECTORY SEPT 2015) I see the following...

31.0375 39.9375 HOME CORDLESS ANALOGUE TELEPHONES CH.1 NATIONAL USAGE FM
31.0625 39.9625 HOME CORDLESS ANALOGUE TELEPHONES CH.2 NATIONAL USAGE FM
31.0875 39.9875 HOME CORDLESS ANALOGUE TELEPHONES CH.3 NATIONAL USAGE FM
31.1125 40.0125 HOME CORDLESS ANALOGUE TELEPHONES CH.4 NATIONAL USAGE FM
31.1375 40.0375 HOME CORDLESS ANALOGUE TELEPHONES CH.5 NATIONAL USAGE FM
31.1625 40.0625 HOME CORDLESS ANALOGUE TELEPHONES CH.6 NATIONAL USAGE FM
31.1875 40.0875 HOME CORDLESS ANALOGUE TELEPHONES CH.7 NATIONAL USAGE FM
31.2125 40.1125 HOME CORDLESS ANALOGUE TELEPHONES CH.8 NATIONAL USAGE FM
(from http://ukscanningdirectory.co.uk)

Now I have always got hits on these... always strongest on the 31MHz channels which I believe are the base. These hits are rare now as I know DECT has taken over and places such as Argos only now sell digital models... I did however notice some 31MHz sets are on sale at our local market he he.

So I understand why they are rarely used now compared to... say... 10 years back... but another problem I have is that many days I have to lock them out due to a strong noise on the channel.

Then I notice this in the file UK SPECTRUM BANDPLAN (1 kHz - 80 GHz)...

31.037 MHz - 31.212 MHz - Licence Exempt, Cordless Telephones (CT1; extended CT1; CT2 and DECT)

Cordless Telephones
31.0375 39.9375 CH.1
31.0625 39.9625 CH.2
31.0875 39.9875 CH.3
31.1125 40.0125 CH.4
31.1375 40.0375 CH.5
31.1625 40.0625 CH.6
31.1875 40.0875 CH.7
31.2125 40.1125 CH.8
(from http://ukscanningdirectory.co.uk)

What stood out to me was the DECT bit... I always thought they were 900MHz and above? Is that the noise I am hearing?
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Re: 31.037 MHz - 31.212 MHz (CT1; CT1; CT2 and DECT)

Postby SilverShadow » Mon Nov 02, 2015 12:17 am

Yep, Ofcom added DECT to the allowed modes of those and the even older Cordless telephone Frequencies at 47MHz.

In practice though I don't think any new DECT cordless telephones are actually made and released in the old analogue bands though, although legally I guess they can. Sadly below 50MHz gets a lot of interference which is most probably what you are hearing. If you can get an audio or video clip of it that would help ID it better.
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Re: 31.037 MHz - 31.212 MHz (CT1; CT1; CT2 and DECT)

Postby Davie Boy » Mon Nov 02, 2015 1:24 am

Tks for the quick reply... it does not sound like digital such as DMR or Paging... mostly choppy and sometimes a heavy buzz... will start on one channel and then most if not all of the others... when it does it I lock them all out for a while and then they are OK again... I think interference is right but noticing DECT there made me think.
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Re: 31.037 MHz - 31.212 MHz (CT1; CT1; CT2 and DECT)

Postby T2tim » Wed Dec 02, 2015 3:23 am

I havnt heard any phones on 31mhz for ages so they must have all switched to digital in my area. still quite a few analogue baby monitors here though if your into hearing babies crying their heads off lol. I heard one the other morning while scanning through 49/50mhz crying "mama mama I want my mamma" I thought his mum wont be too happy waking her up at 3am! she never came though and it made me feel a bit sorry for the poor little devil lol. that said, he may have found something nice in the Argos magazine he wanted for christmas lol
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Re: 31.037 MHz - 31.212 MHz (CT1; CT1; CT2 and DECT)

Postby Alfie » Wed Dec 02, 2015 10:16 pm

I still get the odd rare hit on the 31MHz ones every now and then but nothing on the 47MHz or 900MHz ones
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Re: 31.037 MHz - 31.212 MHz (CT1; CT1; CT2 and DECT)

Postby AndrewIrvine » Thu Jun 29, 2017 8:45 pm

900 mHz range will most likely be GSM now.
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