SRSP-307.7 — Technical Requirements for Fixed Line–of–Sight Radio Systems Operating in the Band 7725–8275 MHz
Spectrum Management and Telecommunications
Standard Radio System Plan
Issue 6 of SRSP–307.7 has been released to incorporate refinements to the minimum antenna characteristics and emission limits. This SRSP replaces SRSP–307.7, Issue 5.
Issued under the authority of the Minister of Industry
Spectrum Engineering Branch
- Related Documents
- Radio Frequency Channel Arrangement Description
- Transmitter Characteristics
- Antenna Characteristics
- Maximum Equivalent Isotropically Radiated Power
- Avoidance of the Geostationary–satellite Orbit
1.1 This Standard Radio System Plan (SRSP) states the minimum technical requirements for the efficient use of the band 7725–8275 MHz by low, medium and high–capacity (LC, MC and HC) point–to–point radio systems in the fixed service using digital modulation.
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.
2.1 This Standard replaces SRSP–307.7, Issue 5. 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, 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 Allocations 9 kHz to 275 GHz.
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 .
Canadian Table of Frequency Allocations 9 kHz to 275 GHz
CPC - Client Procedures Circular
RSP - Radio Standards Procedure
SP - Spectrum Utilization Policy
TRC -Telecommunications Regulation Circular
The radio frequency channel arrangements defined in this Standard provide for six different RF channel bandwidths. Channel pairs are provided with a common transmit/receive separation of 300 MHz. See Table 3 for RF channel frequencies.
4.1 High–capacity (HC) Radio Frequency Channel Arrangements
4.1.1 30 MHz
The centre frequencies of the 8 paired channels which allow RF channel bandwidths of 30 MHz are expressed by the following relationships:
Lower half of the band An = 7710 + 30n for n = 1 to 8
Upper half of the band A'n = 8010 + 30n for n = 1 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
The centre frequencies of the 12 paired channels which allow RF channel bandwidths of 20 MHz are expressed by the following relationships:
Lower half of the band Bn = 7715 + 20n for n = 1 to 12
Upper half of the band B'n = 8015 + 20n for n = 1 to 12
where n is the channel number and Bn and B'n are the centre frequencies in MHz of the paired channels.
4.2 Medium–capacity (MC) Radio Frequency Channel Arrangements
4.2.1 10 MHz
The centre frequencies of the 25 paired channels which allow RF channel bandwidths of 10 MHz are expressed by the following relationships:
Lower half of the band Cn = 7720 + 10n for n = 1 to 25
Upper half of the band C'n = 8020 + 10n for n = 1 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 50 paired channels which allow RF channel bandwidths of 5 MHz are expressed by the following relationships:
Lower half of the band Dn = 7722.50 + 5.0 n for n = 1 to 50
Upper half of the band D'n = 8022.50 + 5.0 n for n = 1 to 50
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 100 paired channels which allow RF channel bandwidths of 2.5 MHz are expressed by the following relationships:
Lower half of the band En = 7723.75 + 2.5 n for n = 1 to 100
Upper half of the band E'n = 8023.75 + 2.5 n for n = 1 to 100
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 200 paired channels which allow RF channel bandwidths of 1.25 MHz are expressed by the following relationships:
Lower half of the band Fn = 7725.0 + 1.25 n for n = 1 to 200
Upper half of the band F'n = 8025.0 + 1.25 n for n = 1 to 200
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 Loops
Systems must be designed so that any closed loop will consist of an even number of hops.
4.6 Assignment of Frequencies
New systems using 10 MHz or smaller channel plans should use the lowest available frequency pair that can be successfully coordinated. New systems using the 20 MHz or 30 MHz channel plans should use the highest available frequency pair that can be successfully coordinated.
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 bits/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 One protection channel will normally be permitted for systems with more than one working channel.
4.8.2 Quad–path diversity applications will be considered on a hop–by–hop basis to solve special propagation problems.
5.1 The transmitter power delivered to the antenna input should not exceed the limits per RF channel shown in Table 1 below.
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 ±0.002% 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 emission shall be attenuated below the mean output power of the transmitter in accordance with the following equation:
A = 35 + 0.8 (P B 50) + 10 log10 B (dB)
A = attenuation (dB) below the mean output power level
P = percent removed from the carrier frequency
B = authorized bandwidth (MHz)
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 emission shall be attenuated by 43 + 10 log10 (mean output power in watts) dB, or 80 dB, whichever is the lesser attenuation.
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.
|Envelope||Minimum Radiation Suppression to Angle in Degrees from Centreline of Main Beam (dB)|
The maximum equivalent isotropically radiated power (e.i.r.p.) from the antenna must not in any case exceed +55 dBW per RF channel.
Where practicable, sites for transmitting terrestrial stations in the fixed service, and employing maximum values of e.i.r.p. exceeding +35 dBW in the frequency band 7725–8275 MHz, should be selected so that the direction of maximum radiation of an antenna will be at least 2° away from the geostationary–satellite orbit, taking into account the effect of atmospheric refraction.
|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|
- 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.
- 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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