Commonwealth Numbered Regulations

1995 No. 74 RADIOCOMMUNICATIONS (MULTIPOINT DISTRIBUTION STATION LICENCES - REGIONAL LICENCES) GUIDELINES No. 1 of 1995 - SCHEDULE 3

                          SCHEDULE 3              Subclause 3(1)

CALCULATION OF "R" For EIRP <- 63 dBm

(EIRP - 26.03)
    R = 10       20
For EIRP > 63 dBm and Ht <- 300 m

R = 71 + (EIRP-63)/1.2271 For EIRP > 63 dBm and Ht > 300 m
(EIRP - 26.03)
    R = 10       20              for EIRP <- 26.03 - 20log(x)
or,
    R = x + (EIRP-Pi)/1.2271      for EIRP > Pi

Pi = 26.03 - 20log(x) where: EIRP : EIRP of the adjacent channel transmitter
(dBm)
Ht :   height of the transmitting antenna over the average level of

the ground between distances of 3 and 15 km from the
transmitter in the direction of the receiver (m)
x :    distance to the horizon (km)

where:
x = x' + 8.1493log(x'/71)
    x' =   G/1.2271 + 71

G = 17.6y0.5 - 5log(y) - 78.446
y = 24.589Ht/300 - 1.1 The table below provides values for R based on specific
values of Ht and EIRP. It can be used to verify values of R calculated in
accordance with the above method.
       Ht*             EIRP**

    (metres)          (Watts)

              100     200    1000    2000    10000

     37.5      16      22     27      29      34

      75       16      23     37      39      44

     150       16      23     50      52      57

     300       16      23     50      71      77

     600       16      23     50      71     104

    1200       16      23     50      71     144

Values for R (km)

* Ht: MDS transmitting antenna height above the average level of the ground
between distances of 3 and 15 km from the transmitter in the direction of the
receiver (see CCIR Rec 370-5)

**EIRP: the EIRP of the proposed MDS transmitter
(NOTE. CCIR Recommendations are available from the Standards Australia
International Sales Group, Strathfield NSW.)