4.5.3 Narrowband area service - VHF Mid Band (148 – 174 MHz) | ACMA

4.5.3 Narrowband area service - VHF Mid Band (148 – 174 MHz)

Licence type


Frequency band(s)

4.0 Broadcasting

4.5 Narrowband area service (NAS)

4.5.3 VHF High Band (148 - 174 MHz)


Band/Channel plan(s)

Narrowband area services may operate in segments F (151.39375 to 152.49375 MHz) and W (173.29375 to 174.00000 MHz) of the VHF High Band Frequency Band Plan (148 –174 MHz). Assignments are to be made within Segment F in the first instance, unless frequencies in this segment are unavailable.


Narrowband services are assigned channel bandwidths of 25 kHz.  Where possible, channel centre frequencies should be assigned in accordance with the following formula:

Segment F:        151.40000 + n x (0.02500) MHz, n=1 to 43;

Segment W:       173.32500 + n x (0.02500) MHz, n=1 to 26


Refer also to Attachment 1 of the Narrowband area service licensing information paper.

Information paper(s)

Narrowband area service licensing

Licence conditions determinations

Spectrum embargoes
(current as of last update of this page)

Embargoes 32 and 41 apply.


For a current list of applicable embargoes, refer to RALI MS03.

Coordination criteria
(RALIs, Advisory Guidelines etc)

Intra-service coordination

For the purpose of frequency coordination, a narrowband area service station should be treated as a single frequency land station in the land mobile service. Refer to Attachment 1 of the NAS information paper.

Coordination Criteria for the land mobile service are detailed in RALI LM08 - Frequency assignment requirements for the land mobile service.


Inter-service coordination

RALI LM05 – Frequency assignment procedure for land mobile services adjacent to TV channels 2, 3 and 6

RALI MS32 – Coordination of apparatus licensed services within the Mid West Radio Quiet Zone

AP alert

Frequency assignment practices

Business operating procedures

  1. ACMA contact details for accredited persons
  2. Procedure for submitting requests for exemptions from embargoes
  3. Radiocommunications site data requirements
  4. BOP Correcting information in the ACMA’s Register of Radiocommunications Licences

Spatial data

Download embargo areas, in Placemark (Google Earth) and Shapefile format, from the spectrum embargoes web page.

Other information


Last updated: 26 September 2017