Electronic And Postal Communications (Digital and other Broadcasting Networks) G.N. No. 418 (contd) – for fixed reception, Corr = 20 log10 (f/fr), where f is the actual frequency and fr the reference frequency of the relevant band quoted in Table 1; – for portable reception and mobile reception, Corr = 30 log10 (f/fr) where f is the actual frequency and fr the reference frequency of the relevant band quoted in Table 1. The standard deviation used for the calculation of the location correction factor of each RPC shall be as follows: – for RPC 1 and RPC 2: 5.5 dB in VHF and UHF, – for RPC 3: 6.3 dB in VHF and 7.8 dB in UHF. (c) A Multiplex Operator shall use four Reference Networks (RNs) in order to cover the different implementation requirements for DVB-T networks as follows: large service-area SFN, small service area SFN & dense SFN, small service area SFN for urban environment and semi-closed small service area SFN. (a) (b) (c) (d) (e) I: Large service-area SFN (Table 2) This network consists of seven transmitters situated at the centre and at the vertices of a hexagonal lattice. The transmitters have non-directional antenna patterns; The service area is assumed to exceed the transmitter hexagon by about 15%. This network applies to: fixed, outdoor/mobile, and indoor reception, for both Band III and Bands IV/V. For portable and mobile reception, the size of the real service areas for this type of SFN coverage is restricted to 150 to 200 km in diameter Table 2: Parameters of Large Service Area SFN RPC and reception type RPC 1 Fixed antenna RPC 2 Portable outdoor and mobile RPC 3 Portable indoor Open Open Open Hexagon Hexagon Hexagon 7 7 7 Geometry of transmitter lattice Hexagon Hexagon Hexagon Distance between transmitters d (km) 70 50 40 Service area diameter D (km) 161 115 92 Tx effective antenna height (m) 150 150 150 Non-directional Non-directional Non-directional Band III 34.1 36.2 40.0 Bands IV/V 42.8 49.7 52.4 Type of network Geometry of service area Number of transmitters Tx antenna pattern e.r.p.* (dBW) 51