SCHEDULE 2

CALCULATION OF TERRAIN LOSS BETWEEN A SPECTRUM LICENSED TRANSMITTER AND RCS BASE/REPEATER/CUSTOMER RECEIVERS

The terrain loss (Lt) may be calculated by using Method A or Method B below. Method A is only to be used where there are no terrain obstructions between the sites. Otherwise Method B should be used.

Method A: Diffraction over a spherical Earth ( or smooth earth diffraction loss)

Terrain loss due to diffraction over a spherical Earth is calculated using the formula below.

Lt = -(F(X) + G(Y1) + G(Y2)) (dB)

where:

Lt = smooth earth diffraction loss (dB)

X = the normalised length of the path between the antennas at normalised heights Y1 and Y2

= 2.2 f1/3 ae -2/3 d

Yn = 0.0096 f2/3ae -1/3 Hn

where:

ae = k r

r = 6370 km (earth radius)

k = equivalent earth radius factor (k=3 which represents

> 20% of time)

Hn = antenna height above spherical earth (m)

n = 1 for site 1 and

2 for site 2

d = path length (km)

f = frequency (MHz)

The distance term F(X) is given by

F(X) = 11 + 10 log (X) - 17.6 X (dB)

The height gain terms G(Y1) and G(Y2) are given by:

G(Yn) = 17.6 (Yn - 1.1)1/2 - 5 log (Yn - 1.1) - 8 for Yn > 2

G(Yn) = 20 log(Yn + 0.1 Yn3) for Yn < 2

Method B: Diffraction over obstacles and irregular terrain (single and multiple knife edge)