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Spectrum band plan 007 - EE band 25 kHz Fixed Service (FS) channels
EE band 25 kHz Fixed Service (FS) channels
1. Purpose
Developments in technology have resulted in a requirement to make spectrum available in this frequency range for high efficiency digital services using advanced modulation methods, such as 16-QAM. Such applications require a 25 kHz channel to allow the transmission of a 64 kb/s data stream, or a voice circuit in conjunction with a multiplicity of lower data rate channels.
2. Policy
From the date of issue of this POLDOC applications to use 25 kHz channels in the frequency ranges 162.20625 to 162.45625 MHz, paired with 166.80625 to 167.05625 MHz, and 165.45625 to 165.70625 MHz, paired with 170.05625 to 170.30625 MHz, will be accepted. Applications for 12.5 kHz channels in the same spectrum will continue to be accepted.
3. Specific criteria
Channel frequencies will be selected from the tables in annexes 1 or 2.
Apparatus that has been approved to the standard RFS36 or AS/NZ 4768 must be used.
The 25 kHz channels will only be made available for use by high efficiency digital services using at least a 16-state modulation scheme, such as 16-QAM or equivalent.
Single-channel voice or single-low-rate digital transmissions must continue to use the 12.5 kHz EE band channels.
4. General technical consideration
There is only a small amount of spectrum that can be made available for fixed services in this frequency range, so it needs to be reserved for applications involving high data rate digital services over relatively obstructed paths, or other situations that require a similarly high level of link availability. High gain antennas should be used, to help maximize re-use of the channels.
5. General
The spectrum being made available is that already used by fixed services for single channel purposes over difficult paths (EE band channels EE1 to EE20, and EE 261 to EE280). A 25 kHz overlay has been implemented for the new EEW (EE wide) channels whereby each EEW channel fully overlaps two 12.5 kHz EE channels. See the overlay diagram in annex 2. While this is not in accordance with some spectrum planning principles, it reduces the work required to coordinate new EEW channels in an area where narrow band EE channels are also used.
Interleaving channels so that the centre frequency of an EEW channel aligns with the centre frequency of an EE channel requires additional work in licensing, as three overlapping EE channels have to be taken into consideration. There is no intention to impinge upon the Mobile Service (MS) 12.5 kHz channels in implementing this 25 kHz fixed service plan, and the 12.5 kHz FS channels will continue to be available.
Verified By:
Manager
Spectrum Planning
Approved By:
Manager
Operational Policy
