Preseli transmitting station

Columns: Frequency | UHF | kW | Service | System
599.25 MHz | 37 | 100 | Channel 5 | PAL System I | 618.000 MHz | 39 | 1 | SDN ( Mux A ) | DVB-T | 623.25 MHz | 40 | 100 | ITV1 Wales | PAL System I | 641.833 MHz | 42- | 2 | BBC ( Mux B ) | DVB-T | 650.166 MHz | 43+ | 20 | BBC A | DVB-T | 665.833 MHz | 45- | 1 | Arqiva ( Mux C ) | DVB-T | 671.25 MHz | 46 | 100 | BBC One Wales | PAL System I | 697.833 MHz | 49- | 1 | Arqiva ( Mux D ) | DVB-T | 703.25 MHz | 50 | 100 | S4C | PAL System I | 714.166 MHz | 51+ | 2 | Digital 3 & 4 ( Mux 2 ) | DVB-T

Example questions:
Which parameter does this Preseli transmitting television station unit describe in computers , which the facilities headquartered at Crawley Court use for broadcasting signals ? | Which mathematical equation in terms of energy involves this Preseli transmitting television station unit , which the world 's oldest national broadcaster uses to specify its channel ? | In which country was this Preseli transmitting television station broadcasting standard , currently used by the company owned by ITV plc , first introduced ? | What type of Preseli transmitting television station unit system is this unit that the free-to-air television channel launched in 1997 uses to distinguish itself ?

Answers:
clock speeds | photon energy equation | Singapore | International System of Units