RSS-138 — Commercial Shipborne Radar in the 2900–3100 MHz, 5470–5650 MHz and 9225–9500 MHz Bands

5. General Standard Specifications

5.1 Quality Control

Periodic testing shall be carried out by the manufacturer or importer to ensure continuing compliance (with the standards) of the newly manufactured/imported equipment intended for sale in Canada. The manufacturer or importer shall correct non-compliance problems. Industry Canada will conduct audit checks, from time to time, to ensure compliance.

5.2 Equipment Labels

Equipment that is certified under this Specification shall be permanently labelled on each item or as an inseparable combination. The label shall contain the following information:

1. the certification number, prefixed by the term "IC:";
2. the manufacturer's name, trade name or brand name; and
3. a model name or number.

Equipment for which a certificate has been issued is not considered certified if it is not properly labelled.

Note: The information on the Canadian label can be combined with the manufacturer’s other labelling requirements.

5.3 External Controls

The device shall not have any external controls accessible to the user that enables the device to be adjusted, selected or programmed to operate in violation of the limits prescribed in this Standard.  Furthermore, information on internal adjustments, reconfiguration or programmability of the device shall only be made available to service depots and agents of the equipment supplier and NOT to the public.

5.4 Exposure of Humans to Radio Frequency Fields

Before equipment certification is granted, the requirements of RSS-102 shall be met, as applicable.

6. Transmitter and Receiver Standard Specifications

6.1 Pulse Length and Pulse Repetition Rate

The transmitter pulse length and pulse repetition rate must meet the limits given in Table 1 (Section 6.5).

6.2 Frequency Stability

The carrier frequency shall not depart from the reference frequency in excess of the value given in Table 1 (Section 6.5).

6.3 Transmitter Output Power

The output power shall not be below the minimum or exceed the maximum limits given in Table 1 (Section 6.5).

6.4 Transmitter Unwanted Emissions

The boundary between the out-of-band and spurious domains in the case of primary radars in the radiodetermination service and other relevant services can be defined as separated from the assigned frequency by 5 times the -40 dB bandwidth (5xB-40).

6.4.1 Out-of-Band Emissions

Figure 3 shows the radar emission bandwidth and emission levels for the radar covered in this specification.

Figure 3 - Radar Emission Bandwidth and Emission Levels

The Relative Suppression values are specified in terms of dB with respect to Power Spectral Density (psd) or dB sp.

Note:  In Figure 3, the roll-off slope, S, from the -40 dB to -X dB points is at 20 dB per decade for maritime radionavigation radar. The maximum emission spectrum level between the -40 dB and -X dB points for S dB per decade slope is described by the formula:

$$Suppression (db) = -S*log \hspace {1mm} \Bigg| \frac {F - F_0} {\frac{1}{2} B (-40 dB)} \Bigg| -40$$

Where: $$\frac{1}{2}(-40 db) \le | F - F_{0} | \le \frac{1}{2} B (- XdB)$$

and: F is the frequency at which Supression is calculated

and: $$B(-XdB) = (10^{a})B(-40 db)$$

$$a = \frac {X-40}{S}$$

Any emission outside the -40 dB bandwidth which occurs in the frequency range separated from the assigned frequency of the emission by less than 5B-40 of the emission will be considered an emission in the out-of-band domain.

The measured power spectral density of the radar out-of-band emission level at the antenna must be attenuated below the maximum spectral power density by at least (see Figure 3):

1. 20 dB per decade (S=20) between the ±B(-40dB)/2 and ±B(-XdB)/2 frequencies from Fo, and
2. 60 dB at and beyond the frequencies ±B(-XdB)/2 from Fo

Figure 4 shows the out-of-band mask for radars related to percentage of frequency separation from the assigned frequency Fo.

6.4.2 Spurious Emissions

For the purpose of this RSS all emissions, including intermodulation products, conversion products and parasitic emissions, which fall at frequencies separated from the centre frequency of the emission by 5B-40 or more, will generally be considered as emissions in the spurious domain. However, this frequency separation may be dependent on the type of modulation, the type of transmitter, and frequency coordination factors.

The maximum permitted spectral density for spurious emissions must be attenuated below the maximum power spectral density by 60 dB.

6.5 Operating Characteristics and Standard Specifications

Commercial shipborne radars’ operating parameters must comply with the limits given in Table 1.

Table 1 - Operating Characteristics for Commercial Shipborne Radar

Transmitter Characteristic 2900-3100 MHz 5470-5650 MHz 9225-9500 MHz
Maximum Minimum Maximum Minimum Maximum Minimum
Antenna Gain (dB) 35 20 35 20 35 20
Tx Peak power (kW) 100 1 100 1 100 1
Frequency (MHz) 3100 2900 5650 5470 9500 9225
Pulse length (µs) 1.5 0.03 1.7 0.05 1.5 0.02
Pulse repetition rate (Hz) 4000 300 4000 300 4000 300
Frequency Tolerance (ppm) 800   1250   1250