grouping, but with the advent of Digital broadcasting one of the six muxes could not be fitted into the original B group due to co-channel considerations. Thus mux 6 was transmitted slightly out of band on UHF Channel 55, though this would still be receivable on most B group aerials as this graph makes clear. In July 2007 it was confirmed by Ofcom that Sutton Coldfield would return to an undisputed B group transmitter post-Digital Switchover, a process that was completed on 21 September 2011. An MF transmitter for Radio Birmingham (now BBC WM) used to be installed at this site, but could only be operated at 5 kW instead of the planned 10 kW because of interference to video equipment on the site. It was eventually replaced with a transmitter at the nearby Langley Mill MF site owned by Arqiva. This transmitter is currently used for the BBC Asian Network. The station is now owned by Arqiva. Radio Analogue (FM) Digital (DAB) Television Digital Before switchover Analogue Analogue television signals are no longer broadcast from Sutton Coldfield as of 21 September 2011. Relays The transmitter is served by a set of 35 local relays, delivering signals to areas shaded from it by hills and the curve of the Earth. These are: Digital switchover Digital switchover took place at Sutton Coldfield in September 2011. In preparation for this, major engineering works took place at the station. The mast height was increased from to and the UHF television antennas were replaced. This was accomplished through the use of a temporary mast constructed to broadcast all the area's services so that the main mast could be worked on 'cold'. As at other stations, the digital switchover took place in two stages: In the first stage (7 September 2011): BBC Two analogue (Channel 40) closed down Low-power BBC multiplex (Mux 1) on channel 41 closed down Low-power SDN multiplex (Mux A) moved from channel 47 to channel 41 (until stage 2) ITV analogue moved from channel 43 to channel 40 (until stage 2) High-power multiplex BBC A started on channel 43 In the second stage (21 September 2011): BBC One analogue (Channel 46) closed down ITV analogue (Channel 40) closed down Channel 4 analogue (Channel 50) closed down Mux 1 (C41), Mux 2 (C44), Mux A (C47), Mux B (C51), Mux C (C52) and Mux D (C55) closed down All multiplexes increased in