Electronic And Postal Communications (Digital and other Broadcasting
Networks)
G.N. No. 418 (contd)
(b) The geometry for this network is identical to Small Service Area SFN, dense, except for
the antenna patterns of the transmitters, which have a reduction of the outgoing field
strength of 6 dB over 240 degrees (i.e. it is a semi-closed RN).
(c) This network applies to: fixed, outdoor/mobile and indoor reception, for both Band III
and Bands IV/V.
TABLE 5:PARAMETERS OF SEMI-CLOSED SMALL SERVICE AREA SFN
RPC
RPC 1
RPC 2
RPC 3
Semi-closed
Fixed antenna
Semi-closed
Portable outdoor
and mobile
Semi-closed
Portable indoor
Hexagon
Hexagon
Hexagon
3
3
3
Triangle
Triangle
Triangle
40
25
25
Service area diameter D (km)
46
29
29
Tx effective antenna
height (m)
150
150
150
Directional
6 dB reduction over
240°
Directional
6 dB reduction over
240°
Directional
6 dB reduction over
240°
Band III
22.0
24.0
32.5
Bands IV/V
29.4
37.2
44.8
Type of network
and reception type
Geometry of service area
Number of transmitters
Geometry of transmitter
lattice
Distance between
transmitters d (km)
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.
Dar es Salaam
29th November, 2011
MAKAME M. MBARAWA
Minister for Communications,
Science and Technology
54