Electronic And Postal Communications (Digital and other Broadcasting Networks) G.N. No. 418 (contd) The e.r.p. is given for 200 MHz in Band III and 650 MHz in Bands IV/V; for other frequencies (f in MHz) the frequency correction factor to be added is: 20 log10 (f/200 or f/650) for RPC 1 and 30 log10 (f/200 or f/650) for RPC 2 and RPC 3. * The e.r.p. values indicated in this table incorporate an additional power margin of 3 dB. For the guard interval length, the maximum value 1/4 Tu of the 8k FFT mode is used. The Licensed Multiplex Operator shall ensure that the distance between transmitters in an SFN does not exceed the distance equivalent to the guard interval duration. II: Small service area SFN, dense SFN (Table 3) (a) The network consists of three transmitters situated at the vertices of an equilateral triangle. (b) The transmitters have non-directional antenna patterns. (c) The reference service area is hexagonal. (d) This network applies to: fixed, outdoor/mobile and indoor reception, for both Band III and Bands IV/V. (e) The network is intended for small service area SFN coverage. (f) Transmitter sites with appropriate effective antenna heights are required to be available for this type of network and self-interference restrictions are small. (g) Typical service area diameters should be from 30 to 50 km. TABLE 3: PARAMETERS OF SMALL SERVICE AREA SFN RPC and reception type Type of network Geometry of service area Number of transmitters Geometry of transmitter lattice RPC 1 Fixed antenna RPC 2 Portable outdoor and mobile RPC 3 Portable indoor Open Open Open Hexagon Hexagon Hexagon 3 3 3 Triangle Triangle Triangle Distance between transmitters d (km) 40 25 25 Service area diameter D (km) 53 33 33 Tx effective antenna height (m) 150 150 150 Non-directional Non-directional Non-directional Band III 24.1 26.6 34.1 Bands IV/V 31.8 39.0 46.3 Tx antenna pattern e.r.p.* (dBW) The e.r.p. is given for 200 MHz in Band III and 650 MHz in Bands IV/V; for other frequencies (f in MHz) the frequency correction factor to be added is: 20 log10 (f/200 or f/650) for RPC 1 and 30 log10 (f/200 or f/650) for RPC 2 and RPC 3. * The e.r.p. values indicated in this table incorporate an additional power margin of 3 dB. 52