Commonwealth of Australia
Radiocommunications Act 1992
Radiocommunications (Unacceptable Levels of Interference) Determination No.1 of 1996
I, CHRISTINE MARY GOODE, Spectrum Manager, on behalf of the Spectrum Management Agency, under section 145 of the Radiocommunications Act 1992
determine the following unacceptable levels of interference.
Dated 6 November 1996.
CHRISTINE M. GOODE
Spectrum Manager
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CONTENTS
Clause
1. Title
2. Commencement
3. Purpose
4. Interpretation
5. Group of transmitters
6. Unacceptable level of interference
7. Emission designator
Schedules
Schedule 1 Centre location and effective radius of a transmitter
Schedule 2 Device boundary of a transmitter and In-band compatibility
criterion (500 MHz)
Schedule 3 Effective antenna height
Schedule 4 Lb Lower Band
Schedule 5 Lb Upper Band
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Title
1. This determination is called the Radiocommunications (Unacceptable Levels of Interference) Determination No.1 of 1996.
Commencement
2. This determination commences on 6 November 1996.
Purpose
3. This determination sets out what is an unacceptable level of interference caused by a transmitter operating under a spectrum licence issued in the 500 MHz band.
[NOTES: 1. The SMA may refuse to register a transmitter if the operation of the transmitter could cause an unacceptable level of interference to the operation of other radiocommunications devices - see s.145 of the Act.
2. The SMA has issued written advisory guidelines under s.262 of the Act about co-ordination procedures in relation to receivers operated in Telstra’s Radio Concentrator System. The SMA does not intend to afford protection to receivers operated under spectrum licences from any interference they may incur from RCS transmitters operated in accordance with their apparatus licence. The SMA also intends to afford protection, in accordance with the guidelines, to RCS receivers from transmitters operated under a spectrum licence. Each case will be assessed on its merits. Copies of the guidelines, the Radiocommunications Advisory Guidelines (Co-ordinating the operation of transmitters in the 500 MHz Bands) 1996, are available from the SMA.]
Interpretation
4. (1) In this determination, unless the contrary intention appears:
Act means the Radiocommunications Act 1992.
Australian National Spheroid means the Australian National Spheroid as used with the Australian Geodetic Datum 1984 and published in the Gazette on 6 October 1966.
cell means a square with a side measured in degrees by reference to the Australian National Spheroid.
centre location, in relation to a transmitter, means the centre location of the transmitter calculated in accordance with Schedule 1.
device boundary, in relation to a transmitter or a group of transmitters operated under a spectrum licence, means the device boundary established in accordance with Part 1 of Schedule 2.
effective antenna height means the effective height of an antenna calculated in accordance with Schedule 3.
effective occupied bandwidth, in relation to a transmitter, means the minimum width of a frequency band having fixed upper and lower limits that is necessary to contain 99% of the true mean power of the transmitter’s emission at any time.
effective radius, in relation to a transmitter, means the value in kilometres of the effective radius for the transmitter, calculated in accordance with Schedule 1.
emission centre frequency, in relation to a transmitter, means the frequency midway between the lower and upper frequency limits of the transmitter’s effective occupied bandwidth.
emission designator has the meaning given by clause 7.
fixed receiver means a radiocommunications receiver located at a fixed point on land or sea and not established for use while in motion.
fixed transmitter means a radiocommunications transmitter located at a fixed point on land or sea and not established for use while in motion.
geographic area, in relation to a spectrum licence, means the area within which operation of a radiocommunications device is authorised under the licence.
group of transmitters has the meaning given by clause 5.
horizontally radiated power, in relation to a radiocommunications device, means the radiated maximum true mean power, within the frequency band of the licence authorising the operation of the device, summed over all polarisations and measured in units of dBm EIRP in a direction referenced from, and in the horizontal plane containing, the phase centre of the antenna used with the device.
in-band, in relation to a transmitter operated under a spectrum licence, means the frequencies within the frequency band of the spectrum to which the licence relates.
in-band compatibility criterion (500MHz) means the value of the mathematical expression calculated in accordance with Part 2 of Schedule 2.
maximum true mean power means the true mean power measured in a 12.5 kHz rectangular bandwidth that is located within a specified frequency band such that the true mean power is the maximum of true mean powers produced.
[NOTE: The power within a 12.5 kHz rectangular bandwidth is normally established by taking measurements using either an adjacent channel power meter incorporating, for example, a standard 8.5 kHz filter as specified in AS4295/95 or a spectrum analyser with, for example, a 300 Hz resolution bandwidth. The accuracy of measuring equipment, measurement procedure and any corrections to measurements necessary to take account of practical filter shape factors would normally be made in accordance with good engineering practice.]
mean power means the average power measured during an interval of time that is at least ten times the period of the lowest modulation frequency.
mobile transmitter means a radiocommunications transmitter established for use while in motion or during halts at unspecified points on land or sea.
publish includes publish electronically.
RadDEM means the digital elevation model, developed by the SMA for radiocommunication purposes, that contains modelled terrain height information for Australia in cells of a size of 9 seconds of arc, access to which is available through the SMA.
roads mobile list means the list giving the names of major roads, latitude and longitude of the centre location, the effective radius and 2 sets of co-ordinates from which sections of the roads may be identified, published by the SMA, copies of which are available from the SMA.
spectrum map grid means the map grid developed by the SMA for Australia, showing cells the sides of which measure 3 degrees of arc, 1 degree of arc or 5 minutes of arc, published by the SMA, copies of which are available from the SMA.
towns mobile list means the list giving the names of towns, latitude and longitude of the centre location and the effective radius for each town, published by the SMA, copies of which are available from the SMA.
true mean power means:
(a) if an unmodulated carrier is present - the mean power measured while the unmodulated carrier is present; and
(b) if an unmodulated carrier is not present - the mean power measured while transmitted information is present.
500 MHz band means the following frequency bands:
(a) 500.99375 MHz - 504.99375 MHz (the 500 MHz Lower band);
(b) 510.99375 MHz - 514.99375 MHz (the 500 MHz Upper band).
[NOTE: The following terms, used in this determination, are defined in the Radiocommunications Act 1992 and have the meanings given to them by that Act:
frequency band interference
SMA spectrum licence
transmitter.]
(2) In this determination, the range of numbers that identifies a frequency band includes the higher, but not the lower, number.
Group of transmitters
5.(1) For the purpose of this determination, two or more transmitters are a group of transmitters if:
(a) they have the same:
(i)intended polarisation for their antennas; and
(ii) for the intended polarisation of their antennas - the same forward gain, 3 dB beamwidth and front to back ratio; and
(iii) the same emission centre frequency; and
(iv) the same emission designator; and
(v) the same effective occupied bandwidth; and
(b) they are operated for the purpose of:
(i) if operated on land - communicating with the same receiver on land or at sea; or
(ii) if operated at sea - communicating with the same fixed receiver on land or at sea.
(2) A transmitter may belong to more than one group of transmitters.
Unacceptable level of interference
6. (1) This clause sets out what are unacceptable levels of interference for the purposes of section 145 of the Act.
[NOTE: Under s.145, the SMA may refuse to register a transmitter if the operation of the transmitter could cause an unacceptable level of interference to the operation of other radiocommunications devices.]
(2) A level of interference caused by a transmitter operated under a spectrum licence issued for the 500 MHz band is unacceptable if the operation results in a breach of a core condition of the licence relating to the maximum permitted level of radio emission from the transmitter:
(a) outside the parts of the spectrum the use of which is authorised by the licence; or
(b) outside the geographic area of the licence.
[Note: S.66(1) of the Act deals with core conditions relating to maximum permitted levels of radio emissions.]
(3) A level of interference caused by a transmitter operated under a spectrum licence issued for the 500 MHz band is unacceptable if any part of the device boundary of the transmitter lies outside the geographic area of the licence.
[Note: For information about the device boundary of a receiver, see the Note in Schedule 2.]
(4) If a device boundary of a transmitter cannot be calculated in accordance with Schedule 2, the transmitter is taken to cause unacceptable interference.
(5) In spite of subclause (3), a transmitter that operates in any of the following circumstances is taken not to cause unacceptable interference while it is operating in those circumstances:
(a) a mobile transmitter that operates:
(i) outside the limits of a town that is on the towns mobile list; or
(ii) on a road that is not on the roads mobile list;
(b) a mobile transmitter that operates, or a group of mobile transmitters all of which operate, in the 500 MHz Upper band with a horizontally radiated power always less than or equal to 30 dBm EIRP;
(c) a mobile transmitter that only transmits at sea and only communicates with a mobile receiver at sea.
Emission designator
7. (1) In this determination, a reference to an emission designator, in relation to a transmitter, is a reference to the designation of the transmitter’s emission worked out in accordance with Article 4 and Appendix 6 of the Radio Regulations published by the International Telecommunication Union as in force on the day on which this determination commences.
(2) For the purpose of working out the designation of the transmitter’s emission, the references in Article 4 and Appendix 6 to necessary bandwidth for a given class of emission are taken to be references to the effective occupied bandwidth of the transmitter.
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SCHEDULES
SCHEDULE 1
Clause 4(1)
Centre location and effective radius of a transmitter
[NOTE: 1. A model for the location of a transmitter (the effective location) is the circumference of the circle defined by the centre location and the effective radius.
2. A mobile transmitter operating outside the limits of a town that is on the towns mobile list or on a road that is not on the roads mobile list, or that only transmits at sea and only communicates with a mobile receiver at sea, does not need a centre location or effective radius because it is exempt from registration - see s.69(2) of the Act and the registration conditions of spectrum licences.]
1. The centre location of a transmitter is the centre of a circle lc with an effective radius re. This Schedule sets out the lc and re of particular transmitters.
For a fixed transmitter, lc is the location (by latitude and longitude) of the phase centre of the transmitter’s antenna and re is zero.
(a) Operating in a town. For a mobile transmitter operating within the limits of a town specified in the towns mobile list, lc and re are taken to be those specified in the towns mobile list for that town.
(b) Operating on a major road. For a mobile transmitter that is operating on a section of a major road, the centre location and effective radius of the mobile transmitter is the centre location and effective radius specified in the roads mobile list for that section of road. A section of road is that part of the road intersected by 2 lines drawn:
(i) starting from each of the 2 sets of coordinates in the roads mobile list from which sections of the road may be identified; and
(ii) along the shortest distance from each set of coordinates to the road; and
(iii) along the latitude or longitude of the coordinate.
A transmitter is taken to be on a road if it is within one kilometre of any part of the road.
4. Centre location and effective radius of a mobile transmitter operating at sea
For a mobile transmitter operating only at sea and communicating with a fixed receiver, lc is the location (by latitude and longitude) of the phase centre of the fixed receiver’s antenna and re is 28 km.
SCHEDULE 1 - continued
5. Centre location and effective radius of a group of fixed transmitters
The centre location and effective radius of a group of fixed transmitters is to be worked out as if the group were a single mobile transmitter.
6. Centre location and effective radius of a group of mobile transmitters operating on land
The centre location and effective radius of a group of mobile transmitters operating on land is to be worked out as if the group were a single mobile transmitter operating on land.
7. Centre location and effective radius of a group of mobile transmitters operating at sea
The centre location and effective radius of a group of mobile transmitters operating at sea and communicating with the same fixed receiver is to be worked out as if the group were a single mobile transmitter operating at sea and communicating only with a fixed receiver.
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SCHEDULE 2
Clause 4(1)
PART 1
Device boundary of a transmitter or a group of transmitters
[Note: it is not necessary to calculate a device boundary for mobile transmitters that operate outside the limits of a town on the towns mobile list, on a road that is not on the roads mobile list, or at sea, as these will not be registered - see the Radiocommunications (Register of Spectrum Licences) Determination 1996, copies of which are available from the SMA.]
1. The device boundary of a transmitter is established as follows:
Step 1: Calculate the in-band compatibility criterion (500 MHz) for each increment (m5) minutes in distance by reference to the Australian National Spheroid, where m is any integer beginning 1 to 30, along each of 36 radials. All increments m=1, begin at the common central point of the radials. The common central point is the centre location of the transmitter. The 36 radials have bearings taken clockwise and given by the sequence 0, 1, 2,... 33, 34, 35 (n) according to the sequence rule n = n10 degrees referenced to true north.
[NOTE: In the expression “m5”, and similar expressions, the symbol “ · ” represents the operation of multiplication.]
Step 2: Calculate an end point for each radial as the point corresponding to the sum of :
(a) the distance in kilometres along the radial equal to the length corresponding to the number of 5 minute increments from the centre location of the transmitter that corresponds to the calculated value of the in-band compatibility criterion (500 MHz) being zero or negative when either all the previous values calculated for that radial are positive, or the number of the increment is equal to 1; and
(b) the effective radius of the centre location.
[Notes: 1. The value of m for each increment is the same as the value of m for the segment referred to in paragraph 2(c) of Schedule 3.
2. The actual distance in kilometres for a 5 minute increment in distance varies according to the direction and location of the radial by reference to the Australian National Spheroid. Distances measured in minutes are accepted usage in mapping.]
Step 3: Identify the location of each end point by reference to the spectrum map grid.
Step 4: Connect the end point of each radial consecutively to draw a polygon in relation to the spectrum map grid cells.
SCHEDULE 2 - continued
Step 5: Aggregate the spectrum map grid cells that either fall within or are intersected by the polygon. The boundary of this aggregated area is the device boundary of the transmitter.
[Note: For information about the device boundary of a receiver, see the Note in Schedule 2.]
2. (1) The device boundary of a group of transmitters:
(a) is to be calculated as if for a single mobile transmitter; and
(b) when calculating the in-band compatibility criterion (500 MHz), for each transmitter in the group the radiated power is calculated in accordance with subclauses (2) and (3).
(2) If no two transmitters in the group transmit simultaneously for more than 5% of the time in any one hour period, the horizontally radiated power is taken:
(a) to be equal for each bearing n ; and
(b) to have a value that is greater than or equal to the horizontally radiated power, in any direction, of any transmitter in the group.
(3) If subclause (2) does not apply, the horizontally radiated power is taken:
(a) to be equal for each bearing n ; and
(b) to have a value of 49.2 dBm per 12.5 kHz.
3. If there is more than one centre location for a mobile transmitter, a device boundary is to be calculated for each centre location.
4. In the case of a group of transmitters some of which operate in a town that is on the towns mobile list and some of which operate on a section of major road that is on the roads mobile list, a device boundary is to be calculated for each number of transmitters that operates in the town or on the major road.
5. In the case of a transmitter that operates at sea and communicates with more than one fixed receiver, a device boundary is calculated for each fixed receiver.
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SCHEDULE 2 - continued
PART 2
In-band compatibility criterion (500 MHz)
The in-band compatibility criterion (500 MHz) is the value, rounded to one decimal place, of the mathematical expression:
RP - Lb - LOP.
where:
RP is the Radiated Power, that is, the horizontally radiated power
for each bearing n.
Lb is the Propagation Loss, being a function of hem(n ) and
dm(n),
where:
hem(n) is the effective antenna height of the transmitter measured in metres for segment m (m being any integer from 1 to 30) for each bearing n; and
dm(n) is the distance m5 minutes with reference to the Australian National Spheroid, calculated for segment m and measured in kilometres for each bearing n.
Lb(hem(n), dm(n)) measured in units of dB, for transmitters operating in the 500 MHz Lower band, is as described as ‘Lb Lower band’ in Schedule 4.
Lb(hem(n), dm(n)) measured in units of dB, for transmitters operating in the 500 MHz Upper band, is as described as ‘Lb Upper band’ in Schedule 5.
[NOTE: For segment m, see Schedule 3, clause 2(c).]
LOP is the Level of Protection.
The Level of Protection is equal to -134 dBm per 12.5 kHz when calculating the value of the in-band compatibility criterion (500 MHz) for a transmitter operating in the 500 MHz Lower band
The Level of Protection is equal to -139 dBm per 12.5 kHz when calculating the value of the in-band compatibility criterion (500 MHz) for a transmitter operating in the 500 MHz Upper band
SCHEDULE 2 - continued
[NOTE: CALCULATING A DEVICE BOUNDARY OF A RECEIVER
The procedure used for calculating the device boundary of a transmitter and determining that it can operate under a given spectrum licence without causing unacceptable interference has a consequence for receivers also operating under a spectrum licence. (The detailed procedure for calculating a device boundary of a receiver is contained in Schedule 2 of the Radiocommunications Marketing Plan (500 MHz Band) 1996, copies of which are available from the SMA.) As a consequence of the procedure, receivers are required to accept higher levels of interference as they move closer to the boundary of the geographic area of the spectrum licence under which they are operated. In addition, receivers in these situations are required to accept still higher levels of interference as their effective antenna height for segment “m”=1 increases.
The two values for the level of protection (LOP) used in calculating the in-band compatibility criterion are based on two radiocommunications receivers that have notional sensitivities, effective antenna heights and locations outside the geographic area of the licence. An actual receiver may also have an LOP based on both its effective antenna height and its location inside the geographic area of the licence. LOPs indicate the maximum level of in-band interference that a licensee may have to accept when operating a receiver.
A receiver may be operated without regard to its LOP because actual levels of interference depend upon the existence of any nearby interfering transmitters. For example, in remote areas, receivers operating within the 500 MHz Lower band at high sites and having poor LOPs may be operated successfully because the likelihood of interference in those locations is low. However, the licensee takes full risk and if the licensee makes an interference complaint to the SMA the calculated LOP will be taken into account by the SMA in interference settlement.
For a given LOP, any part of the device boundary of the receiver must not lie outside the geographic area of the spectrum licence under which it is operated. In addition, a device boundary may only be calculated for certain values of LOP and effective antenna height.
A device boundary exists for any receiver operating under a spectrum licence issued for the 500 MHz Lower band when its effective antenna height for segment “m”=1 is greater than or equal to 1.5 metres or equal to or less than 10 metres. In other cases the LOP is -77 dBm per 12.5 kHz.
A device boundary also exists for any receiver operating under a spectrum licence issued for the 500 MHz Upper band when its effective antenna height for segment “m”=1 is greater than or equal to 20 metres or equal to or less than 1600 metres. Where a device boundary does not exist then its LOP is
-77 dBm per 12.5 kHz.
LOPs cannot be less than -139 dBm per 12.5 kHz. This level of protection is called the benchmark level of protection.
The device boundary of a receiver is established in the same manner as the device boundary of a transmitter except that the LOP-Lower Criterion (500 MHz) and LOP-Upper Criterion (500 MHz), as described below, replace the In-band Compatibility Criterion (500 MHz) for receivers authorised under a spectrum licence for the 500 MHz Lower band and 500 MHz Upper band respectively. The centre location, effective radius, dm(n), hs, hg and hagm(n) (see diagram in Schedule 3) of the receiver are determined as if the receiver is a transmitter, except that the effective antenna height of a fixed receiver (hem(n)) is calculated as described below. The effective antenna height for a mobile, group of mobile or group of fixed receivers is determined as if the receiver is a transmitter.
SCHEDULE 2 - continued
LOP-Lower Criterion (500MHz)
For simplification let:
If LOPR is a level of protection desired for a receiver in units of dBm per 12.5 kHz and LOPR is greater than or equal to -139 dBm per 12.5 kHz:
(a) the LOP-Lower Criterion (500 MHz) for:
(i) 0.1 km d 10 km; and
(ii) 1.5 m he 10 m;
is the value, rounded to one decimal place, of the mathematical expression:
LOPR - 3.2(log10(11.8 he))2 + 30log10(d) + 93;
(b) the LOP-Lower Criterion (500 MHz) for:
(i) 10 km d; and
(ii) 1.5 m he 10 m;
is the value, rounded to one decimal place, of the mathematical expression:
LOPR - 3.2(log10(11.8he)) 2 + 60log10(d) + 59.
LOP-Upper Criterion (500MHz)
For simplification let:
If LOPR is a level of protection desired for a receiver in units of dBm per 12.5 kHz and LOPR is greater than or equal to -139 dBm per 12.5 kHz:
(a) the LOP-Upper Criterion (500 MHz) for:
(i) 0.1 km d 10 km; and
(ii) 20 m he 1600 m;
is the value, rounded to one decimal place, of the mathematical expression:
LOPR - (1.6 he)1/2 + 30log10(d) + 90; or
(b) the LOP-Upper Criterion (500 MHz) for:
(i) 10 km d; and
(ii) 20 m he 1600 m;
is the value, rounded to one decimal place, of the mathematical expression:
LOPR - (1.6 he) 1/2 + 60log10(d) + 55.
SCHEDULE 2 - continued
Effective Antenna Height (hem(n)) of a Fixed Receiver
For a fixed receiver operating at a specified centre location in the 500 MHz Lower Band the effective antenna height:
(a) for segment “m” = 1, he1(n), is hg for that centre location except when
(hs - hg - hag1(n)) is 48 in which case he1(n) is (hs - hag1(n)) for that centre location; and
(b) for segments “m” = 2 to 30, hem(n), is (hs - hagm(n)) for that centre location except when
(hs - hagm(n)) is 10 in which case hem(n) is 10 for that centre location.
For a fixed receiver operating at a specified centre location in the 500 MHz Upper Band the effective antenna height:
(a) for segment “m” =1, he1(n), is hg for that centre location except when
(hs - hg -hag1(n)) is 0 in which case he1(n) is (hs - hag1(n)) for that centre location; and
(b) for segments “m” = 2 to 30, hem(n), is (hs - hagm(n)) for that centre location except when (hs - hagm(n)) is 20 in which case hem(n) is 20 for that centre location.]
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SCHEDULE 3
Clause 4(1)
Effective Antenna Height
1. The effective height of an antenna is determined in accordance with its transmitter, as set out in this Schedule.
[Note: The SMA provides software facilities, for persons accredited under s.263 of the Act to issue interference impact certificates under s.145(3) of the Act, to calculate tables of effective antenna heights for any location in Australia.]
2. Effective antenna height of a fixed transmitter (see Diagram 1 below)
If:
(a) hg is the vertical height in metres of the phase centre of the fixed transmitter’s antenna measured relative to the point:
(i) located on the line of intersection between the external surface of the structure supporting the antenna and the surface of the ground or sea; and
(ii) having the lowest elevation on that line; and
(b) hs is the sum of:
(i) the elevation attribute of the RadDEM cell containing the location of the phase centre of a fixed transmitter’s antenna; and
(ii) hg; and
(c) hagm(n) is average ground height, as described below, for each of the segments ‘m’ of a sector of 10 degrees arc centred along each of the bearings n, calculated by taking the average of the elevation attributes for all of the cells that have either half or more than half their area within each segment ‘m’; and
(d) each sector is divided into 30 segments “m” (as illustrated in Diagram 2 below) with:
(i) any two consecutively numbered segments 1 to 30 being contiguous; and
(ii) each segment being a 5 minute increment in radial distance; and
(iii) segment 1 beginning at the centre location;
then:
(e) for fixed transmitters operating in the 500 MHz Lower band the effective antenna height:
(i) for segment 1, he1(n), is hg for that centre location except when
(hs - hg - hag1(n)) is 0 in which case he1(n) is (hs -hag1(n)) for that centre location; and
(ii) for segments 2 to 30, hem(n) where m is any integer in the range 2 to 30, is (hs -hagm(n)) for that centre location except when
(hs - hagm(n)) is 30, in which case hem(n) is 30 for that centre location; and
(f) for fixed transmitters operating in the 500 MHz Upper band the effective antenna height:
(i) for segment 1, he1(n), is hg for that centre location except when
(hs - hg - hag1(n)) is 48 in which case he1(n) is (hs - hag1(n)) for that centre location; and
SCHEDULE 3 - continued
(ii) for segments 2 to 30, hem(n) where m is any integer in the range 2 to 30, is (hs - hagm(n)) for that centre location except when
(hs - hagm(n)) is 5 in which case hem(n) is 5 for that centre location.
[Note: A RadDEM cell is represented as raster data such that the western and southerly boundary of the cell is part of the cell but the northerly and easterly boundary is part of the adjacent cells. This is an important consideration when a location falls on a cell boundary.]
Diagram 1
Calculating effective antenna height
hg
hem (n ) = hs - hagm
hs hs - hg - hag1 (n )
hagm (n )
sea level
hg : antenna height above ground
hs : antenna height above sea level
hagm (n ) : average ground height above sea level in segment ‘m’ of sector ‘n’
hem (n ) : effective antenna height for segment ‘m’ of sector ‘n’
(note: for this case hs - hg - hag1 (n ) > 0 )
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Diagram 2
Segments and sectors
segment
(not to scale) sector
sector/segment intersection area
for calculating hagm(n)
SCHEDULE 3 - continued
The effective antenna height of a mobile transmitter for any segment “m” =1 to 30 and any bearing (n), hem(n) is hg metres, where hg is greater than the height of the phase centre of the transmitter’s antenna above any three points of contact between the transmitter’s mobile support and:
(a) if the transmitter is operating in an enclosed space - any surface; or
(b) in any other case - the surface of the earth or sea.
4. Effective antenna height of a group of mobile transmitters
For a group of mobile transmitters:
(a) the group is to be treated as if the highest antenna in the group is part of a single mobile transmitter; and
(b) the effective antenna height of the group is the height of that highest antenna.
5. Effective antenna height of a group of fixed transmitters
For a group of fixed transmitters where the antenna height above ground of the highest transmitter (hgmax), calculated in accordance with clause 2(a), is equal to or less than 15 metres:
(a) the group of transmitters is to be treated as if it is a single mobile transmitter; and
(b) the effective antenna height of the group hem(n), is hgmax for any segment “m”=1 to 30, and any bearing (n).
However, if a fixed transmitter in the group transmits for more than 5% of the time in any 1 hour period, each transmitter in the group is to be treated as if it were a single fixed transmitter and the effective antenna height of each fixed transmitter is to be worked out as for a single fixed transmitter.
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SCHEDULE 4
Schedule 2
Lb Lower Band
For the purpose of calculating the in-band compatibility criterion in Schedule 1, the propagation loss for the 500 MHz Lower band (Lb Lower band) is calculated as set out below.
For simplification let:
If he 1.5, then he = 1.5; and
if he 1,600 then he = 1,600.
For 1.5 he 15,
Lb Lower band = 157
For 15 he 30 and 0 < d 25
Lb Lower band = (157 + 4.5 (he - 15) ( log10 (d + 25) - 1.31))
For 15 he 30 and 25 < d
Lb Lower band = (130.7 + 1.75 he)
For 30 he 1600 and 0 < d 232
Lb Lower band = (60 log10 (d + 22) + 89.5 - (1.6 he)1/2)
For 30 he 1600 and 232 < d
Lb Lower band = 183.2
SCHEDULE 5
Schedule 2
Lb Upper Band
For the purpose of calculating the in-band compatibility criterion in Schedule 1, the propagation loss for the 500 MHz Upper band (Lb Upper band) is calculated as set out below.
For simplification let:
If he 1.5, then he = 1.5; and
if he 1,600 then he = 1,600.
For 1.5 he 15 and 0 < d 89
Lb Upper band = (60 log10 (d + 50) + 76.5 - 3.2 (log10 (11.8 he))2
- 4.4 (he - 1.5) (log10 (d + 50) - 1.7))
For 1.5 he 5 and 89 < d
Lb Upper band = 188.2
For 5 he 15 and 89 < d
Lb Upper band = (188.2 - 2.62 ( he - 5))
For 15 he 30,
Lb Upper band = 162
For 30 he 1600,
Lb Upper band = 139
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