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Definitions and Technical Requirements

Technical and Operational Rules for Radio Communication Equipment using the Licence-Exempt Bands... (con't)

4. Definitions

For the purposes of this document,

  • Urban refers to the Kingston Metropolitan Region, inclusive of the parishes of Kingston, St. Andrew and St. Catherine.
  • Rural refers to all areas outside of that defined as urban.
  • Public Radio System – A public radio system is one where the beneficiary of the system might not be the licensee or anyone concerned with the business of the licensee. The licensee may receive a payment, consideration or other benefit, wither directly through a contractually managed fee or indirectly through standing charges levied at a point of sale of any equipment to be connected to the system or by any other means, in payment for the service of providing and maintaining the radio facility for use by third parties.
  • Private Radio System -A private radio system is one where the purpose and exclusive benefit of use of the radio system is solely in the interest of the licensee’s business. This may include use by third parties such as contractors where the work/radio use of that third party is on behalf of the licensee and does not include any traffic that is not connected with the business of the licensee. Communication should be solely concerned with the business of the licensee, who will receive no payment, consideration or other benefit from any third party in respect of the provision of radio communication facilities.
  • Short Range Devices (SRD’s) - This covers a variety of radio devices providing either unidirectional or omni-directional communication (point to point or point to multipoint) and which, due to their low transmitter power, have a low risk of interference to other devices.

5. Technical Requirements

The licence-exempt bands are,

902 – 928 MHz

2.400 – 2.4835 GHz and

5.725 – 5.850 GHz.

The modulation methods of the equipment that will be allowed in these bands are those methods that minimize the mutual interference caused by multiple devices operating in the same band with geographic overlap. In this regard the two (2) most common forms of spread spectrum techniques are:

(i)
Frequency Hopping Spread Spectrum , FHSS, and
(ii)
Direct Sequence Spread Spectrum, DSSS.

902 – 928 MHz Band

For systems operating with FHSS technique, if the minimum bandwidth of the hopping channel is 250 kHz, then the minimum number of hopping channels shall be 50, the average time in each hopping channel shall be 0.4 second within a 20 second period, and the maximum peak output power shall be 1Watt. For FHSS systems with hopping channel of minimum bandwidth of 500 kHz, the minimum number of hopping channel shall be 25, with the average time in each hopping channel being 0.4 seconds within a 10 second period, and the maximum peak output power shall be 0.25 Watt.

2.4 – 2.4835 GHz Band.

The hopping channels shall have a minimum bandwidth of 1 MHz. If the minimum number of hopping channel is 15, then the average time within the hopping channel shall be 0.4 sec. times 15 (hopping channels), and the power shall be 0.125 Watt. If the minimum number of hopping channel is 75, then the average time within the hopping channel shall be 0.4 sec. times 75.

5.725 – 5.850 GHz Band

The hopping channels shall have a minimum bandwidth of 1 MHz. The minimum number of hopping channels shall be 75, the average time within each hopping channel shall be 0.4 sec. in a 30 sec. period. The maximum output power level shall be 0.75 Watts.

DSSS systems operating in all three bands shall occupy at least 500 kHz at the 6 dB point, with the maximum peak output power being 0.5 Watt in urban and 1 Watt in rural areas.

Out of Band Emissions

In any 100 kHz bandwidth outside the frequency band in which the spread spectrum system is operating, the radio frequency power that is produced by the system shall be at least 30 dB below that in the 100 kHz bandwidth within the band that contains the highest level of the desired power.

FREQUENCY BAND SPREAD SPECTRUM MODULATION ECHNIQUE MINIMUM BANDWIDTH OF HOPPING CHANNEL AVERAGE TIME IN EACH HOPPING CHANNEL MINIMUM NUMBER OF HOPPING CHANNELS MAXIMUM POWER LEVEL
902 -928MHz Frequency Hopping 250KHz 0.4 sec within 20 sec period 50 1 Watts
500KHz 0.4 sec within 10 sec period 25 0.25 Watts
2.4 - 2.4835GHz Frequency Hopping 1MHz 0.4 sec within 0.4 (15) (no. of Hopping Channel/sec) 15 0.125 Watts
0.4 sec within 0.4 x 75 sec 75 0.5 Watts
FREQUENCY BAND SPREAD SPECTRUM MODULATION ECHNIQUE MINIMUM BANDWIDTH OF HOPPING CHANNEL AVERAGE TIME IN EACH HOPPING CHANNEL MINIMUM NUMBER OF HOPPING CHANNELS MAXIMUM POWER LEVEL
5.725 - 5.850 GHz Frequency Hopping 1MHz 0.4 sec in 30 sec period 75 0.75 Watts
All 3 Direct Sequence Spread Spectrum 500KHz for 6db N/A N/A 0.75 Watts

 

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