 After experimentation on the Brighton experimental ensemble , Ofcom advertised for small scale DAB multiplexes to broadcast across the United Kingdom on ten localised multiplexes for a nine @-@ month trial period . The trials will test the viability of using free and open source software with low cost equipment to broadcast from a single transmitter , a single frequency network or channel repeaters to allow smaller radio stations to broadcast more cost effectively than is currently possible on local multiplexes . 
