RSS-210 – Licence-exempt Radio Apparatus (All Frequency Bands): Category I Equipment

Annex 2 – Devices Operating in Frequency Bands for Any Application

A2.1 Band 160–190 kHz

Devices using this band shall limit the total input power to the final radio frequency stage to 1.0 watt maximum, and the total length of transmission line, antenna and ground lead (if used) to 15 metres maximum. Example: A coaxial or twin-wire transmission line of L metres long has a wire length of 2L. If a loop antenna of N turns is used with this transmission line, compute the length of wire used by the N turns, and add the result to 2L. The total shall not exceed 30 metres.

Emissions outside of this band shall be attenuated by at least 20 dB below the mean transmitter output power or to the general field strength limits listed in RSS-Gen, whichever is less stringent.

A2.2 Band 510–1705 kHz

Devices using this band shall comply with one of the following limits:

  1. The total input power to the final radio frequency stage shall not exceed 100 milliwatts, and the total length of transmission line, antenna and ground lead (if used) shall not exceed 3 metres; or
  2. The field strength of radiated emissions shall not exceed 250 microvolts/m measured at 30 metres.
  3. Transmitters that employ a leaky coaxial cable as a radiating antenna may meet the field strength limit of 15 microvolts/m, as measured at a distance of 47715/(frequency in kHz) metres (equivalent to wavelength / ( 2 π ) ) from the coaxial cable.
  4. Emissions outside of this band shall be attenuated by at least 20 dB below the mean transmitter output power, or to the general field strength limits listed in RSS-Gen, whichever is less stringent.

A2.3 Band 1.705–10 MHz

The field strength shall not exceed 100 microvolts/m measured at 30 metres with an average meter. However, if the -6 dB bandwidth of the emission is less than 10% of the centre frequency, the field strength shall not exceed 15 microvolts/m at 30 m or (the bandwidth of the device in kHz) divided by (the centre frequency of the device in MHz) microvolts/m at 30 m, whichever is the higher level.

Outside of this band, general field strength limits listed in RSS-Gen shall apply.

A2.4 Band 1.705–37 MHz Swept Frequency

Notwithstanding that this band encompasses some restricted bands listed in RSS-Gen, swept frequency devices are permitted when all the following conditions are met:

  1. The sweep is never stopped with the fundamental emission within any restricted band listed in RSS-Gen;
  2. The field strength does not exceed the limits in sections A2.3, A2.5, A2.6, or the general field strength limits listed in RSS-Gen, whichever is less stringent, when measured with the sweeping stopped in those bands.
  3. The fundamental emission dwelling on any restricted band listed in RSS-Gen shall not exceed 1.0% of the time that the device is actively transmitting, without compensation for duty cycle.
  4. Outside of the swept frequency band, the out-of-band emission limits in sections A2.5 and A2.6, or the general field strength limits listed in RSS-Gen apply, whichever are less stringent. This test is to be carried out with the frequency sweep in operation.

A2.5 Band 6.765–6.795 MHz

The field strength of any emission shall not exceed the following limits:

  1. 15.5 microvolts/m (84 dBμV/m) at 30 m, inside the allocated band.
  2. 334 microvolts/m (50.5 dBμV/m) at 30 m, outside the allocated band up to Fc ±150kHz.
  3. 106 microvolts/m (40.5 dBμV/m) at 30 m, between Fc ±150 kHz and Fc ±450 kHz.
  4. RSS-Gen general field strength limits for frequencies outside Fc ±450 kHz, except for harmonics, which shall not exceed 316 microvolts/m at 30 m

where Fc = 6.78 MHz.

Carrier frequency stability shall be maintained to ±0.01% (±100 ppm).

A2.6 Band 13.110–14.010 MHz

The field strength of any emission shall not exceed the following limits:

  1. 15.848 microvolts/m (84 dBμV/m) at 30 m, within the band 13.553–13.567 MHz.
  2. 334 microvolts/m (50.5 dBμV/m) at 30 m, within the bands 13.410–13.553 MHz and 13.567–13.710 MHz.
  3. 106 microvolts/m (40.5 dBμV/m) at 30 m, within the bands 13.110–13.410 MHz and 13.710–14.010 MHz.
  4. 30 microvolts/m (29.5 dBμV/m) at 30 m, outside the band 13.110–14.010 MHz.

Carrier frequency stability shall be maintained to ±0.01% (±100 ppm).

A2.7 Band 40.66–40.70 MHz

The field strength shall not exceed 10 microvolts/m (80 dBμV/m) measured at 3 metres with an average meter. Alternatively, it shall not exceed 233 mV/m measured with a quasi-peak meter. (Note: Do not use the above to convert average meter readings to quasi-peak values.)

The -6 dB bandwidth of the emission shall be confined within the 40.66–40.70 MHz band edges.

Outside the 40.65–40.71 MHz band, the general field strength limits listed in RSS-Gen shall apply, except for harmonics, which shall not exceed 225 microvolts/m at 3 metres.

Carrier frequency stability shall be maintained to ±0.01% (±100 ppm).

A2.8 Band 88–108 MHz

The field strength shall not exceed 250 microvolts/m measured at 3 metres with an average meter. Any type of modulation (and carrier frequencies within the band 88–108 MHz) may be used for this category.

The occupied bandwidth shall not exceed 200 kHz.

Outside the 200 kHz band (as well as outside the 88–108 MHz band), the general field strength limits listed in RSS-Gen apply.

If the audio input signal is audio and the transmitter is frequency modulated, compliance with the above requirements shall be demonstrated by modulating the transmitter with a 2.5 kHz tone at a level 16 dB higher than that required to produce a frequency deviation of 75 kHz, or 50 % of the manufacturer's rated deviation, whichever is less.

A2.9 Bands 902–928, 2400–2483.5 and 5725–5875 MHz

This section provides standards for devices that can be used for any application provided that the following conditions are met:

  1. The field strength measured at 3 metres shall not exceed the limits in the following table:
    Bands 902–928, 2400–2483.5 and 5725–5875 MHz – The field strength measured at 3 metres shall not exceed the limits in the following table
    Fundamental
    Frequencies
    (MHz)
    Field Strength
    (millivolts/m)
    Fundamental Harmonics

    Note: The limits shown in the above table are based on measurements using an average detector, except for the fundamental emission in the frequency band 902–928 MHz, which is based on measurements using a CISPR quasi-peak detector.

    902–928 50 0.5
    2400–2483.5 50 0.5
    5725–5875 50 0.5
  2. Emissions radiated outside of the specified frequency bands, except for harmonics, shall be attenuated by at least 50 dB below the level of the fundamental or to the general field strength limits listed in RSS-Gen, whichever is less stringent.

The provisions of RSS-Gen regarding pulsed operation do not apply to CISPR measurement for the band 902–928 MHz.

A2.10 Bands 17.15 GHz and 94 GHz

The following carrier frequencies are available for use by radar and other mobile devices. Their parameters, such as occupied bandwidth and permissible out-of-band emissions, will be evaluated on a case-by-case basis.

  1. 17.15 GHz: 0.3 W e.i.r.p.
  2. 94 GHz: 0.4 W e.i.r.p.