SRSP-306.4 — Technical Requirements for Fixed Line-of-Sight Radio Systems Operating in the Band 6425-6930 MHz

Issue 6
December 2006

Spectrum Management and Telecommunications
Standard Radio System Plan

Preface

Issue 6 of SRSP-306.4 has been released to incorporate refinements to the minimum antenna characteristics and the emission limits. This SRSP replaces SRSP-306.4, Issue 5.

Issued under the authority of the Minister of Industry

space to insert signature
R.W. McCaughern
Director General
Spectrum Engineering Branch

Contents

  1. Intent
  2. General
  3. Related Documents
  4. Radio Frequency Channel Arrangement Description
  5. Transmitter Characteristics
  6. Antenna Characteristics
  7. Maximum Equivalent Isotropically Radiated Power
  8. Avoidance of the Geostationary-satellite Orbit

1. Intent

1.1 This Standard Radio System Plan (SRSP) states the minimum technical requirements for the efficient use of the band 6425-6930 MHz by point-to-point radio systems in the fixed service. These systems are:

  • Low, medium and high-capacity (LC, MC and HC) radio systems using digital modulation; and
  • Radio systems using analogue modulation and used for television studio transmitter link (STL) services.

1.2 This SRSP is intended to be employed in the design and specification of radio systems and equipment and in the evaluation of technical applications for new radio facilities or modification to radio systems submitted in accordance with the current issue of Radio Standards Procedure 113, Application Procedures for Planned Radio Stations above 960 MHz in the Fixed Service (RSP-113).

1.3 This SRSP specifies equipment characteristics relating to efficient spectrum usage only and is not to be regarded as a comprehensive specification for equipment design and/or selection.

2. General

2.1 This Standard replaces SRSP-306.4, Issue 5. Further revision of this SRSP will be made as required.

2.2 Radio systems conforming to these technical requirements will be given priority in licensing over non-standard radio systems operating in this band.

2.3 The arrangements for non-standard systems are outlined in Spectrum Utilization Policy Gen, General Information Related to Spectrum Utilization and Radio Systems Policies (SP Gen).

2.4 The Geographical Differences Policy (GDP) guideline applies in this frequency band. More information on the GDP can be found in SP 1-20 GHz.Footnote 1

2.5 Although a radio system may conform to the requirements of this SRSP, modifications may be required to that system whenever harmful interferenceFootnote 2 is caused.

2.6 When potential interference between radio systems cannot be resolved by the parties concerned, Industry Canada should be advised. After consultation with these parties, the Department will determine the necessary modifications and schedule of modifications to resolve the conflict.

2.7 The Department may require licensees and/or applicants to use receiver selectivity characteristics that provide rejection of harmful interference.

2.8 The use of a two-frequency plan is required. Where reasonable economic or technical justification is provided (e.g. where siting prevents adequate antenna discrimination), extra frequencies may be used to resolve the problem, subject to the provisions of Section 2.4.

2.9 It should be noted that the fixed service shares this band with other services in accordance with the Canadian Table of Frequency AllocationskHz to 275 GHz.

2.10 It should be noted that the radio astronomy service operates in the band 6650-6675.2 MHz solely under the provision of International Telecommunication Union Radio Regulation No. 5.149. Applicants for channels which overlap this band, proposing to operate within the vicinity of the Dominion Radio Astrophysical Observatory (DRAO) near Penticton, B.C. (49 deg. 19' 18" N and 119 deg. 37' 08" W), are encouraged to take steps, where practicable, to avoid causing harmful interference to the DRAO.

3. Related Documents

The current issues of the following documents are applicable and available on the Spectrum Management and Telecommunications website at: http://www.ic.gc.ca/spectrum .

SP 3-30 GHz
Revisions to Spectrum Utilization Policies in the 3-30 GHz Frequency Range and Further Consultation

SP Gen
General Information Related to Spectrum Utilization and Radio Systems Policies

SP 1-20 GHz
Revisions to Microwave Spectrum Utilization Policies in the Range of 1-20 GHz

RSP-113
Application Procedures for Planned Radio Stations Above 960 MHz in the Fixed Service

TRC-43
Notes Regarding Designation of Emission (Including Necessary Bandwidth and Classification), Class of Station and Nature of Service

Canadian Table of Frequency Allocations 9 kHz to 275 GHz


CPC-2-0-03
Environmental Process, Radiofrequency Fields and Land-Use Consultation

dividing line
CPC – Client Procedures Circular
RSP – Radio Standards Procedure
SP – Spectrum Utilization Policy
TRC – Telecommunications Regulation Circular

4. Radio Frequency Channel Arrangement Description

The radio frequency channel arrangements defined in this Standard provide for six different RF channel bandwidths. Channel pairs are provided with transmit/receive separations of 90, 100, 250, or 340 MHz. Unidirectional radio systems using analogue modulation and used for television STL services are specifically addressed under Section 4.1.2 c. See Table 3 for RF channel frequencies.

4.1 High-capacity (HC) Radio Frequency Channel Arrangements

4.1.1 30 MHz

a. The centre frequencies of the 5 paired channels which allow RF channel bandwidths of 30 MHz and a transmit/receive separation of 340 MHz are expressed by the following relationships:

Lower half of the band An = 6415 + 30n for n = 1 to 5
Upper half of the band A'n = 6755 + 30n for n = 1 to 5

where n is the channel number and An and A'n are the centre frequencies in MHz of the paired channels.

b. The centre frequencies of the 3 paired channels which allow RF channel bandwidths of 30 MHz and a transmit/receive separation of 100 MHz are expressed by the following relationships:

Lower half of the band An = 6415 + 30n for n = 6 to 8
Upper half of the band A'n = 6515 + 30n for n = 6 to 8

where n is the channel number and An and A'n are the centre frequencies in MHz of the paired channels.

4.1.2 20 MHz

a. The centre frequencies of the 8 paired channels which allow RF channel bandwidths of 20 MHz and a transmit/receive separation of 340 MHz are expressed by the following relationships:

Lower half of the band Bn = 6420 + 20n for n = 1 to 8
Upper half of the band B'n = 6760 + 20n for n = 1 to 8

where n is the channel number and Bn and B'n are the centre frequencies in MHz of the paired channels.

b. The centre frequencies of the 4 paired channels which allow RF channel bandwidths of 20 MHz and a transmit/receive separation of 100 MHz are expressed by the following relationships:

Lower half of the band Bn = 6420 + 20n for n = 9 to 12
Upper half of the band B'n = 6520 + 20n for n = 9 to 12

where n is the channel number and Bn and B'n are the centre frequencies in MHz of the paired channels.

c. Existing unidirectional radio systems using analogue modulation and used for television STL services must use channels B9 to B12 and channels B'9 to B'12 and may also use channel B13, centred at 6680 MHz. New radio systems using analogue modulation and used for television STL services may also use these same channels provided their operation conforms with the requirements established for digital radio systems in this SRSP.

4.2 Medium-capacity (MC) Radio Frequency Channel Arrangements

4.2.1 10 MHz

a. The centre frequencies of the 16 paired channels which allow RF channel bandwidths of 10 MHz and a transmit/receive separation of 340 MHz are expressed by the following relationships:

Lower half of the band Cn = 6425 + 10n for n = 1 to 16
Upper half of the band C'n = 6765 + 10n for n = 1 to 16

where n is the channel number and Cn and C'n are the centre frequencies in MHz of the paired channels.

b. The centre frequencies of the 9 paired channels which allow RF channel bandwidths of 10 MHz and a transmit/receive separation of 90 MHz are expressed by the following relationships:

Lower half of the band Cn = 6425 + 10n for n = 17 to 25
Upper half of the band C'n = 6515 + 10n for n = 17 to 25

where n is the channel number and Cn and C'n are the centre frequencies in MHz of the paired channels.

4.3 Low-capacity (LC) Radio Frequency Channel Arrangements

4.3.1 5.0 MHz

The centre frequencies of the 20 paired channels which allow RF channel bandwidths of 5 MHz and a transmit/receive separation of 250 MHz are expressed by the following relationships:

Lower half of the band Dn = 6521.25 + 5n for n = 1 to 20
Upper half of the band D'n = 6771.25 + 5n for n = 1 to 20

where n is the channel number and Dn and D'n are the centre frequencies in MHz of the paired channels.

4.3.2 2.5 MHz

The centre frequencies of the 41 paired channels which allow RF channel bandwidths of 2.5 MHz and a transmit/receive separation of 250 MHz are expressed by the following relationships:

Lower half of the band En = 6522.5 + 2.5n for n = 1 to 41
Upper half of the band E'n = 6772.5 + 2.5n for n = 1 to 41

where n is the channel number and En and E'n are the centre frequencies in MHz of the paired channels.

4.3.3 1.25 MHz

The centre frequencies of the 81 paired channels which allow RF channel bandwidths of 1.25 MHz and a transmit/receive separation of 250 MHz are expressed by the following relationships:

Lower half of the band Fn = 6523.75 + 1.25n for n = 1 to 81
Upper half of the band F'n = 6773.75 + 1.25n for n = 1 to 81

where n is the channel number and Fn and F'n are the centre frequencies in MHz of the paired channels.

4.4 Branching or Spur Route Channels

The frequencies assigned to a main route system should be re-used where possible on the branching or spur routes. The siting of repeater stations should be planned with this requirement in view, in order that sufficient antenna discrimination is obtained at the branch-off angle.

4.5 Closed Loop

Systems must be designed so that any closed loop will consist of an even number of hops.

4.6 Assignment of Frequencies

4.6.1 New bi-directional systems using 10 MHz or smaller channel plans should use the lowest available frequency pair that can be successfully coordinated, starting with channel 1. New systems using the 20 or 30 MHz channel plans should use the highest available frequency pair that can be successfully coordinated, starting at channel 9 or 6, respectively.

4.6.2 New unidirectional systems using the 10 MHz channel plan should use the highest available frequency pair that can be successfully coordinated, starting with channel 25. Such systems using the 20 MHz plan should use channel  13 or highest available frequency pair starting with channel 12. Systems using the 30 MHz plan should use the highest available frequency pair starting with channel 8.

4.6.3 For multi-channel systems, channels should be chosen to minimize the number of wider bandwidth channels that may be blocked.

4.7 Spectral Efficiency

4.7.1 High and medium-capacity digital systems submitted for licensing shall have a minimum spectral efficiency of 4.4 bit/s/Hz of the RF channel bandwidth on a single polarization.

4.7.2 Low-capacity digital systems submitted for licensing shall have a minimum spectral efficiency of 2.4 bits/s/Hz of the RF channel bandwidth on a single polarization.

4.8 Protection Channels

4.8.1 Protection channels are not permitted in this band.

4.8.2 Quad-path diversity applications will be considered on a hop-by-hop basis to solve special propagation problems.

5. Transmitter Characteristics

5.1 The transmitter power delivered to the antenna input shall not exceed the limits per RF channel shown in Table 1 below.

Table 1
Bandwidth
(MHz)
Power Limit
(watts) (dBW)
30 10 10
20 10 10
10 7.5 8.8
5 5 7
2.5 2 3
1.25 1 0

5.2 An increase in transmitter power over the above specified limit may be permitted if technical justification is provided. In no event will the power delivered to the antenna input be permitted to exceed 20 watts (+13 dBW) per channel.

5.3 The centre frequency of the emission shall be maintained within ±0.005% of the assigned frequency.

5.4 Emission Limits

5.4.1 In any 4 kHz band, the centre frequency of which is removed from the assigned frequency by more than 50% up to and including 250% of the authorized bandwidth, the mean power of the emission shall be attenuated below the mean output power of the transmitter in accordance with the following equation:

A = 35 + 0.8 (P - 50) + 10 log10 B (dB)

Where:
A = attenuation (dB) below the mean output power level
P = percent removed from the carrier frequency
B = authorized bandwidth (MHz)

Note:
1. In no case shall the attenuation be less than 50 dB.
2. Attenuation greater than 80 dB or to an absolute power of less than -13 dBm/MHz is not necessary.

5.4.2 In any 1 MHz band, the centre frequency of which is removed from the assigned frequency by more than 250% of the authorized bandwidth, the mean power of the emission shall be attenuated by 43 + 10 log10 (mean power in watts) dB, or 80 dB, whichever is the lesser attenuation.

6. Antenna Characteristics

6.1 The co-polarized radiation pattern envelope in the horizontal plane of the antenna must remain within Envelope A defined in Table 2 and shown in Figure 1, for both vertical and horizontal polarizations.

6.2 In uncongested areas, the co-polarized radiation pattern envelope in the horizontal plane of the antenna must remain within Envelope B defined in Table 2 and shown in Figure 1, for both vertical and horizontal polarizations.

6.3 The use of passive repeaters is permitted where a suitable alternative is not practical.

Table 2: Antenna Standards
Envelope Minimum Radiation Suppression to Angle in Degrees from Centreline of Main Beam (dB)
  0° to 1.1° 1.1° to 5° 5° to 10° 10° to 15° 15° to 20° 20° to 30° 30° to 100° 100° to 140° 140° to 180°
A 0 3 25 29 33 36 42 55 55
B 0 3 21 25 29 32 35 39 45

7. Maximum Equivalent Isotropically Radiated Power

The maximum equivalent isotropically radiated power (e.i.r.p.) from the antenna must not, in any case, exceed +55 dBW per RF channel.

8. Avoidance of the Geostationary-satellite Orbit

Where practicable, sites for transmitting terrestrial stations operating in the fixed service, and employing maximum values of e.i.r.p. exceeding +35 dBW in the frequency band 6425-6930 MHz should be selected so that the direction of maximum radiation of the antenna will be pointed at least 2° away from the geostationary-satellite orbit, taking into account the effect of atmospheric refraction.

Where compliance with the above paragraph is impracticable, the maximum e.i.r.p. of the station in the fixed service shall not exceed:

  • +47 dBW in any direction within 0.5° of the geostationary-satellite orbit; or
  • +47 dBW to +55 dBW, on a linear decibel scale (8 dB per degree), in any direction between 0.5° and 1.5° of the geostationary-satellite orbit taking into account the effect of atmospheric refraction.

Line graph illustrating the antenna radiation pattern limits from Table 2

 

Table 3: Channel Identification and Carrier Frequencies for High, Medium and Low-capacity Radio Systems in the Band 6425-6930 MHz Associated with the Equations from Sections 4.1, 4.2 and 4.3
Channel Frequency GO (RETURN) Channels Channel Frequency RETURN (GO) Channels
30 
MHz
20
MHz
10
MHz
5
MHz
2.5
MHz
1.25
MHz
30
MHz
20
MHz
10
MHz
5
MHz
2.5
MHz
1.25
MHz
6430.00             6680.00            
6431.25             6681.25            
6432.50             6682.50            
6433.75             6683.75            
6435.00     C1       6685.00     C'17      
6436.25             6686.25            
6437.50             6687.50            
6438.75             6688.75            
6440.00   B1         6690.00            
6441.25             6691.25            
6442.50             6692.50            
6443.75             6693.75            
6445.00 A1   C2       6695.00 A'6   C'18      
6446.25             6696.25            
6447.50             6697.50            
6448.75             6698.75            
6450.00             6700.00   B'9        
6451.25             6701.25            
6452.50             6702.50            
6453.75             6703.75            
6455.00     C3       6705.00     C'19      
6456.25             6706.25            
6457.50             6707.50            
6458.75             6708.75            
6460.00   B2         6710.00            
6461.25             6711.25            
6462.50             6712.50            
6463.75             6713.75            
6465.00     C4       6715.00     C'20      
6466.25             6716.25            
6467.50             6717.50            
6468.75             6718.75            
6470.00             6720.00   B'10        
6471.25             6721.25            
6472.50             6722.50            
6473.75             6723.75            
6475.00 A2   C5       6725.00 A'7   C'21      
6476.25             6726.25            
6477.50             6727.50            
6478.75             6728.75            
6480.00   B3         6730.00            
6481.25             6731.25            
6482.50             6732.50            
6483.75             6733.75            
6485.00     C6       6735.00     C'22      
6486.25             6736.25            
6487.50             6737.50            
6488.75             6738.75            
6490.00             6740.00   B'11        
6491.25             6741.25            
6492.50             6742.50            
6493.75             6743.75            
6495.00     C7       6745.00     C'23      
6496.25             6746.25            
6497.50             6747.50            
6498.75             6748.75            
6500.00   B4         6750.00            
6501.25             6751.25            
6502.50             6752.50            
6503.75             6753.75            
6505.00 A3   C8       6755.00 A'8   C'24      
6506.25             6756.25            
6507.50             6757.50            
6508.75             6758.75            
6510.00             6760.00   B'12        
6511.25             6761.25            
6512.50             6762.50            
6513.75             6763.75            
6515.00     C9       6765.00     C'25      
6516.25             6766.25            
6517.50             6767.50            
6518.75             6768.75            
6520.00   B5         6770.00            
6521.25             6771.25            
6522.50             6772.50            
6523.75             6773.75            
6525.00     C10   E1 F1 6775.00     C'1   E'1 F'1
6526.25       D1   F2 6776.25       D'1   F'2
6527.50         E2 F3 6777.50         E'2 F'3
6528.75           F4 6778.75           F'4
6530.00         E3 F5 6780.00   B'1     E'3 F'5
6531.25       D2   F6 6781.25       D'2   F'6
6532.50         E4 F7 6782.50         E'4 F'7
6533.75           F8 6783.75           F'8
6535.00 A4   C11   E5 F9 6785.00 A'1   C'2   E'5 F'9
6536.25       D3   F10 6786.25       D'3   F'10
6537.50         E6 F11 6787.50         E'6 F'11
6538.75           F12 6788.75           F'12
6540.00   B6     E7 F13 6790.00         E'7 F'13
6541.25       D4   F14 6791.25       D'4   F'14
6542.50         E8 F15 6792.50         E'8 F'15
6543.75           F16 6793.75           F'16
6545.00     C12   E9 F17 6795.00     C'3   E'9 F'17
6546.25       D5   F18 6796.25       D'5   F'18
6547.50         E10 F19 6797.50         E’10 F'19
6548.75           F20 6798.75           F'20
6550.00         E11 F21 6800.00   B'2     E’11 F'21
6551.25       D6   F22 6801.25       D'6   F'22
6552.50         E12 F23 6802.50         E'12 F'23
6553.75           F24 6803.75           F'24
6555.00     C13   E13 F25 6805.00     C'4   E'13 F'25
6556.25       D7   F26 6806.25       D'7   F'26
6557.50         E14 F27 6807.50         E'14 F'27
6558.75           F28 6808.75           F'28
6560.00   B7     E15 F29 6810.00         E'15 F'29
6561.25       D8   F30 6811.25       D'8   F'30
6562.50         E16 F31 6812.50         E'16 F'31
6563.75           F32 6813.75           F'32
6565.00 A5   C14   E17 F33 6815.00 A'2   C'5   E'17 F'33
6566.25       D9   F34 6816.25       D'9   F'34
6567.50         E18 F35 6817.50         E'18 F'35
6568.75           F36 6818.75           F'36
6570.00         E19 F37 6820.00   B'3     E'19 F'37
6571.25       D10   F38 6821.25       D'10   F'38
6572.50         E20 F39 6822.50         E'20 F'39
6573.75           F40 6823.75           F'40
6575.00     C15   E21 F41 6825.00     C'6   E'21 F'41
6576.25       D11   F42 6826.25       D'11   F'42
6577.50         E22 F43 6827.50         E'22 F'43
6578.75           F44 6828.75           F'44
6580.00   B8     E23 F45 6830.00         E'23 F'45
6581.25       D12   F46 6831.25       D'12   F'46
6582.50         E24 F47 6832.50         E'24 F'47
6583.75           F48 6833.75           F'48
6585.00     C16   E25 F49 6835.00     C'7   E'25 F'49
6586.25       D13   F50 6836.25       D'13   F'50
6587.50         E26 F51 6837.50         E'26 F'51
6588.75           F52 6838.75           F'52
6590.00         E27 F53 6840.00   B'4     E'27 F'53
6591.25       D14   F54 6841.25       D'14   F'54
6592.50         E28 F55 6842.50         E'28 F'55
6593.75           F56 6843.75           F'56
6595.00 A6   C17   E29 F57 6845.00 A'3   C'8   E'29 F'57
6596.25       D15   F58 6846.25       D'15   F'58
6597.50         E30 F59 6847.50         E'30 F'59
6598.75           F60 6848.75           F'60
6600.00   B9     E31 F61 6850.00         E'31 F'61
6601.25       D16   F62 6851.25       D'16   F'62
6602.50         E32 F63 6852.50         E'32 F'63
6603.75           F64 6853.75           F'64
6605.00     C18   E33 F65 6855.00     C'9   E'33 F'65
6606.25       D17   F66 6856.25       D'17   F'66
6607.50         E34 F67 6857.50         E'34 F'67
6608.75           F68 6858.75           F'68
6610.00         E35 F69 6860.00   B'5     E'35 F'69
6611.25       D18   F70 6861.25       D'18   F'70
6612.50         E36 F71 6862.50         E'36 F'71
6613.75           F72 6863.75           F'72
6615.00     C19   E37 F73 6865.00     C'10   E'37 F'73
6616.25       D19   F74 6866.25       D'19   F'74
6617.50         E38 F75 6867.50         E'38 F'75
6618.75           F76 6868.75           F'76
6620.00   B10     E39 F77 6870.00         E'39 F'77
6621.25       D20   F78 6871.25       D'20   F'78
6622.50         E40 F79 6872.50         E'40 F'79
6623.75           F80 6873.75           F'80
6625.00 A7   C20   E41 F81 6875.00 A'4   C'11   E'41 F'81
6626.25             6876.25            
6627.50             6877.50            
6628.75             6878.75            
6630.00             6880.00   B'6        
6631.25             6881.25            
6632.50             6882.50            
6633.75             6883.75            
6635.00     C21       6885.00     C'12      
6636.25             6886.25            
6637.50             6887.50            
6638.75             6888.75            
6640.00   B11         6890.00            
6641.25             6891.25            
6642.50             6892.50            
6643.75             6893.75            
6645.00     C22       6895.00     C'13      
6646.25             6896.25            
6647.50             6897.50            
6648.75             6898.75            
6650.00             6900.00   B'7        
6651.25             6901.25            
6652.50             6902.50            
6653.75             6903.75            
6655.00 A8   C23       6905.00 A'5   C'14      
6656.25             6906.25            
6657.50             6907.50            
6658.75             6908.75            
6660.00   B12         6910.00            
6661.25             6911.25            
6662.50             6912.50            
6663.75             6913.75            
6665.00     C24       6915.00     C'15      
6666.25             6916.25            
6667.50             6917.50            
6668.75             6918.75            
6670.00             6920.00   B'8        
6671.25             6921.25            
6672.50             6922.50            
6673.75             6923.75            
6675.00     C25       6925.00     C'16      
6676.25             6926.25            
6677.50             6927.50            
6678.75             6928.75            
6680.00   B13         6930.00            

Footnotes

Return to footnote 1 Spectrum Utilization Policy 1-20 GHz, Revisions to Microwave Spectrum Utilization Policies in the Range of 1-20 GHz (SP 1-20 GHz), January 1995, contains spectrum utilization principles including the Geographical Differences Policy guideline. This information will be incorporated into a revision of SP Gen.

Return to footnote 2 For the purpose of this SRSP, "harmful interference" means interference that endangers the functioning of a radionavigation service or other safety services or seriously degrades, obstructs, or repeatedly interrupts a radiocommunication service operating in accordance with regulations and technical requirements laid down by Industry Canada under the Radiocommunication Act.

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