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London Bus change over to DMR

Posted: 04 Nov 2018, 14:02
by Metradio
Testing of the London Bus DMR Network has started. From where I live I am receiving DMR in the clear from them on 139.66875MHz, this has been receivable for the last 3 weeks or so. Eventualy the system will be encrypted.
Their current MPT1327 and the new DMR Tier III system use the frequencies between 139.500 and 140.500MHz..

Mike

http://www.landmobile.co.uk/news/tait-t ... act-award/

Re: London Bus change over to DMR

Posted: 07 Nov 2018, 15:32
by Wiggler
Does this testing and upcoming change explain why I can now hear drivers on the 1to1 calls? In the past I could only hear the controller during 1to1 calls but on on group calls I could hear all drivers on the route. Now I can hear both sides all the time.

Re: London Bus change over to DMR

Posted: 07 Nov 2018, 16:37
by Metradio
Yes I think it does...

Mike

Re: London Bus change over to DMR

Posted: 07 Nov 2018, 22:11
by radiosification
I'm rather disappointed, I can't hear the new DMR system still

Re: London Bus change over to DMR

Posted: 08 Nov 2018, 10:01
by Metradio
From Slough I can only pick up the one frequency, but a listener East of London has reported three live DMR frequencies from his location..
Might be worth a search of their band looking for the DMR beacon..

Mike

Re: London Bus change over to DMR

Posted: 21 Nov 2018, 12:44
by trainspotter375
radiosification wrote:
07 Nov 2018, 22:11
I'm rather disappointed, I can't hear the new DMR system still
indeed picking up two very active freqs from the old 2217 (8A9) site. have started to compile a list of the talkgroups but will be a waste of time once it goes encripted, radiosification if you pm me i can supply you the actual freqs and colourcodes/timeslots

Re: London Bus change over to DMR

Posted: 21 Nov 2018, 14:40
by Metradio
Rereading the original TFL tendering requirements, was to have the "ability for encryption" and am not 100% they will implement the facility - only time will tell..

If you have a DMR receiver, the active frequencies can be found by searching between 139.500 and 140.500MHz, the active frequencies send out a constant beacon so are easily found..

Mike

Re: London Bus change over to DMR

Posted: 30 Nov 2018, 18:35
by Metradio
Looks like they are in the midst of changing over today, many channels now DMR..

Mike

Re: London Bus change over to DMR

Posted: 01 Dec 2018, 15:24
by radtech
Lots of bad feedback on my company intranet forum about the new system.

Problems reported from controllers that radios are picking up too much background noise and not enough voice. There's also comments about bad coverage in some areas (Orpington) and alert tones being far too loud.

It seems they've switched users over before testing thoroughly!

Re: London Bus change over to DMR

Posted: 01 Dec 2018, 18:55
by Metradio
radtech wrote:
01 Dec 2018, 15:24
....It seems they've switched users over before testing thoroughly!
Sounds about right...

Mike