Radiocommunications Advisory Guidelines (Managing Interference from Spectrum Licensed Transmitters – 2.3 GHz Band) 2024

The instrument deploys a small set of interlocking concepts and reference points that together shape how interference in and around the 2.3 GHz band is to be managed. The main concepts are definition and scope, reference to technical standards and other instruments, Register‑based protection, the device boundary / subsection 145(4) determination, advisory versus mandatory content, and coordination procedures.

• Definitions and scope: The instrument defines the 2.3 GHz band (2300-2400 MHz) and the key object , a “2.3 GHz spectrum licence” , that authorises operation of radiocommunications devices in that band (s 5). It also brings within scope particular receiver types and services (e.g. AMT, TOB, earth receive station, space research services, AU S87 radio astronomy receivers). The instrument states explicitly the set of circumstances and receiver classes to which its guidance applies (s 7(2)-(3)). The text also directs readers to other determinations and the spectrum plan for additional defined terms (s 5(2)-(5)).
• Reference standards and RALI instruments: Rather than setting novel numeric interference limits within the body of the instrument, it points to existing RALI instruments (FX 3, FX 21, MS 31/32/37), the subsection 145(4) determination, and ITU‑R Recommendations (e.g. P.1144, SF.1006, P.526 and an array of SA.* and SA.* recommendations) as the sources of detailed protection criteria, coordination procedures and propagation models (ss 5, 8-11, 21). The instrument also notes that RALI instruments are subject to continuing review and should be consulted in their current version (s 8(2); s 6).
• Register‑based protection and site specificity: For certain services , notably television outside broadcast services , protection applies only to those receivers whose site details are included in the Register (s 15(1)). The instrument repeatedly signals that inclusion in the Register and the timing of registration relative to other licences matters to who gets protection and when (s 15(1)).
• Device boundary and subsection 145(4) determination: For interference between geographically adjacent 2.3 GHz spectrum licences, the instrument identifies the device boundary criterion in the subsection 145(4) determination as the primary method for managing interference (s 20(1)). The subsection 145(4) determination is also integrated into the recommended coordination procedures (s 21(2)(b)).
• Advisory nature and practical effect: Much of the instrument uses language such as “should” or “are to provide” for licensees and encourages direct liaison between licensees and affected operators during planning (e.g. s 7(6); s 11(4); s 7(5) which allows ACMA to take the instrument into account). The instrument therefore functions as guidance that ACMA may treat as relevant in its determinations. At the same time, it acknowledges that binding obligations may be imposed elsewhere, for example by licence conditions that require compliance with ITU‑R SF.1006 or RALI MS 37 (s 11(2)-(3) notes).
• Coordination and modelling: The instrument instructs that coordination should use Register details, the subsection 145(4) protection level, and suitable propagation models that reflect terrain and other factors, mentioning ITU‑R Recommendation P.526 as an example (s 21(2)(a)-(c) and note).

Together, these concepts structure a regime where detailed technical thresholds and processes are primarily sourced to other technical instruments, and where this guideline advises licence holders to follow those instruments and to document coordination activity; the instrument gives ACMA the discretion to treat adherence to the guidance as relevant when deciding whether a transmitter is causing interference (s 7(5)).

The instrument affects a set of identifiable parties, and it allocates different practical expectations and protections across them. The principal affected actors in the text are:

• 2.3 GHz spectrum licence holders: The instrument is primarily directed at those operating transmitters authorised by spectrum licences in the 2.3 GHz band (s 5). These licensees are repeatedly addressed as the actors who must plan, coordinate, model, register and, where necessary, negotiate or replan to avoid causing harmful or unacceptable interference (see, for example, ss 9, 11, 13, 15, 17, 19, 20-21). The instrument prescribes that, when planning, spectrum licensees “are to provide” a level of in-band and out-of-band protection equivalent to apparatus-licensed fixed services assigned per RALI FX 3 (s 9).
• Apparatus licence holders operating receivers in adjacent bands: Operators of apparatus-licensed fixed services below the 2.3 GHz band, television outside broadcast (TOB) apparatus licence holders, and fixed receive stations used for aeronautical mobile telemetry (AMT) are directly implicated because their receivers may be affected by 2.3 GHz transmitters (ss 7(2)(a), 7(2)(d), 12-13, 14-15). The instrument specifies differing expectations of protection for these groups (see below).
• Operators of earth receive stations and space research/space operations/earth exploration-satellite services: Receivers operating in the 2200-2290 MHz and 2290-2300 MHz bands are expressly called out (s 10). The instrument directs spectrum licensees to consider RALI MS 37 and ITU‑R Recommendations and encourages direct liaison during system planning (ss 10-11).
• Radio astronomy operators, including those using AUS87-designated receivers and operators in and near the Australian Radio Quiet Zone Western Australia (ARQZWA): The instrument references the ARQZWA protection for the Boolardy site and asks licensees to have regard to AUS87 receivers and to coordinate using RALI MS 31 and MS 32 as appropriate (ss 18-19).
• Class‑licence operators, particularly LIPD class licence users in 2400-2483.5 MHz: The instrument recognises that class‑licence operation is generally “no‑interference”/“no‑protection,” and accordingly says that 2.3 GHz spectrum transmitters operated in accordance with licence conditions are generally taken not to cause unacceptable interference to LIPD-class receivers (ss 16-17).
• ACMA: The regulator is both a beneficiary and an active decision‑maker. ACMA may take these guidelines into account when determining whether a 2.3 GHz transmitter is causing interference (s 7(5)), and the instrument makes repeated references to ACMA’s RALI instruments and the Register.
• Other spectrum licence holders in adjacent geographic areas: The instrument anticipates negotiation and coordination between geographically adjacent 2.3 GHz spectrum licence holders to manage interference where the device boundary criterion is not sufficient or where agreement is needed (ss 20-21).

Who pays and who decides, in practical terms drawn from the instrument: Spectrum licensees are the ones expected to bear the costs of planning, modelling, coordination and any replanning or negotiation required to avoid interference (see ss 9, 11, 21). ACMA decides whether a transmitter is causing interference and may treat compliance with this guidance as relevant when exercising that discretion (s 7(5)). Apparatus licence holders and other affected parties may need to register site details in the Register (TOB site details, s 15(1)) to obtain the stated protections.

The instrument also differentiates protection regimes. TOB receivers only obtain protection where site details are included in the Register and where the 2.3 GHz spectrum licence entry postdates the apparatus licence registration (s 15(1)). AMT fixed receive stations in 2200-2290 MHz are treated as not suffering unacceptable interference where the spectrum transmitter operates in accordance with licence conditions (s 13). LIPD class‑licence receivers are generally on a no‑protection basis (s 16), although 2.3 GHz spectrum transmitters operated in accordance with conditions are generally taken not to cause unacceptable interference to them (s 17). For space research services and deep‑space receivers, additional protections may apply via RALI MS 37 and ITU‑R SF.1006 and may be imposed as licence conditions (s 11).

Finally, the instrument does not itself create new classes of regulated parties beyond those above; rather, it organises the interactions between existing licence and service classes under the Act, the spectrum plan and the various RALI and ITU materials cited.

The instrument sets out a combination of advisory duties, practical expectations that carry administrative consequences, and rights of protection that are conditional on registration, planning timing and compliance with licence conditions. The key duties and rights in the instrument are as follows, cited to the relevant provisions.

Duties and expectations for 2.3 GHz spectrum licensees

• Provide RALI-FX3-equivalent protection for fixed services: When planning operation of radiocommunications transmitters under a 2.3 GHz spectrum licence, licensees “are to provide a level of in-band and out-of-band protection from those transmitters as would be provided for apparatus licensed radiocommunications transmitters used for fixed services, the frequencies of which are assigned in accordance with RALI FX 3” (s 9). That language places an expectation on spectrum licensees to meet the protection levels and coordination practices in RALI FX 3 when their transmitters might affect fixed services below 2.3 GHz.
• Consider and follow RALI MS 37 and ITU-R SF.1006 for earth receive stations and space research receivers: The instrument states that protection requirements for earth receive stations are set out in Annex 7 to Appendix 7 of the Radio Regulations and that additional in-band protections are in ITU‑R SF.1006 (s 11(1)-(2)). It also directs licensees to consider RALI MS 37 for space research receivers in 2290-2300 MHz and lists further ITU‑R Recommendations to consult (ss 11(3)-(5)). Some spectrum licences may include licence conditions requiring compliance with these documents (s 11(2) and note).
• Coordinate with TOB operators per RALI FX 21: For TOB services operating in 2170-2300 MHz, the protection requirements are set out in RALI FX 21 and apply to 2.3 GHz transmitters that are included in the Register after the TOB apparatus licence was first issued; only TOB receivers with site details in the Register are afforded protection (s 15(1)-(2)).
• Coordinate with fixed receivers in the Register and use subsection 145(4) protection levels and suitable propagation models: The recommended preliminary coordination procedures require licensees to have regard to Register entries, use the protection level in the subsection 145(4) determination, model path loss with a suitable propagation model (taking account of terrain), and where harmful interference is indicated to replan or negotiate (s 21(1)-(3)). The instrument gives an example of a suitable model (ITU‑R P.526) (s 21 note).
• Liaise with space and earth station operators and AUS87 radio astronomy operators during planning: The instrument “encourages direct liaison” with space and earth station operators during system planning where proximity may cause interference (s 10(4); s 11(4); s 19(2)).

Rights or protections for others, and conditions on them

• TOB apparatus licence holders: Protection applies to TOB receivers in the 2170-2300 MHz band but only if the TOB receiver site details are included in the Register and the TOB apparatus licence pre-dates the spectrum licence entry (s 15(1)).
• AMT fixed receive stations in 2200-2290 MHz: If a 2.3 GHz radiocommunications transmitter is operated under its spectrum licence “in accordance with the conditions of the licence,” then the transmitter “is not taken to cause unacceptable interference” to an apparatus-licensed fixed receive station used for AMT in 2200-2290 MHz, and the 2.3 GHz licensee “does not need to afford additional protection” (s 13). That is an allocation of expectation: compliant operation under licence conditions shields the spectrum licensee from an expectation to provide extra protection to such fixed receive AMT stations.
• LIPD class‑licence receivers: The instrument records that class-licence operators generally operate on a “no‑interference, no‑protection” basis (s 16). It further states that, generally, transmitters under a 2.3 GHz spectrum licence operated in accordance with licence conditions are taken not to cause unacceptable interference to LIPD-class receivers in 2400-2483.5 MHz (s 17). These statements set expectations rather than create new rights enforceable under the instrument itself.
• Radio astronomy (AUS87) and ARQZWA protection: The instrument records the existence of ARQZWA protection and the exclusion of an area within 70 km of the Boolardy site from the geographic area of 2.3 GHz spectrum licences (s 18(2)). It asks licensees to have regard to AUS87 receivers and to follow the notification and coordination arrangements set out in RALI MS 31 and MS 32 as relevant (s 19(1)-(3)).

Administrative effect: ACMA may take the instrument into account when determining whether a transmitter is causing interference (s 7(5)). That gives the instrument practical import: adherence to the guidance, use of the referenced RLIs and ITU standards, and documented coordination efforts will be material to ACMA’s discretionary assessments. Conversely, the instrument expressly does not prevent private parties from negotiating other protection requirements (s 7(6)).

Limitations on duties: Much of the instrument uses advisory language , “should,” “are to,” “encourages” , rather than mandatory enactments. The instrument notes that some obligations arise from licence conditions (e.g. compliance with SF.1006 or RALI MS 37 may be required by specific licence conditions, s 11 notes), meaning that duties can be imposed by reference elsewhere. Practitioners should therefore distinguish between what this instrument advises, and what an individual spectrum licence condition or a separate legislative instrument requires.

The 2024 Radiocommunications Advisory Guidelines themselves do not create express criminal or civil penalties within their text. The instrument is presented as guidance that ACMA may take into account in its regulatory determinations; it is not drafted as an amending instrument for licence conditions or as a sanctions schedule. The enforcement and penalty consequences therefore arise indirectly via the Act, the spectrum licences, and other binding instruments that the guidelines reference. The key enforcement‑related points in the instrument are:

• ACMA’s discretionary use of the guidelines: The instrument states that ACMA “may take this instrument into account in determining whether a radiocommunications transmitter operated under a 2.3 GHz spectrum licence is causing interference to an apparatus licensed or class licensed radiocommunications receiver” (s 7(5)). That provides ACMA with an administrative hook: adherence to the guidelines (and to the RALI and ITU materials the instrument references) is a factor ACMA can consider when exercising powers under the Act to determine interference and, by extension, when deciding on remedies available under the Act or licence conditions.
• Licence conditions and binding obligations: The instrument notes that “some 2.3 GHz spectrum licences may have a licence condition requiring compliance with provisions of ITU‑R Recommendation SF.1006” (s 11(2) note) and that “some 2.3 GHz spectrum licences may have a licence condition requiring compliance with provisions of RALI MS 37 in certain circumstances” (s 11(3) note). Enforcement of those licence conditions would run through the Act’s enforcement machinery and any sanctions attached to breaches of those licence conditions, not through this guideline itself.
• Register and timing effects: For TOB protection, the instrument makes protection contingent on site registration and on the order of Register entries (s 15(1)). That has an administrative effect: a spectrum licence holder may be found to be causing interference to a TOB receiver only to the extent the TOB receiver is registered and accordingly protected; conversely, failure to register site details may affect enforcement expectations.
• Device boundary criterion and subsection 145(4) determination: The instrument identifies the device boundary criterion in the subsection 145(4) determination as the primary method for managing interference between geographically adjacent 2.3 GHz licences (s 20(1)). The subsection 145(4) determination itself (the Radiocommunications (Unacceptable Levels of Interference - 2.3 GHz Band) Determination 2024) will contain formally binding rules under the Act about unacceptable levels of interference and how they are measured; the guideline’s reliance on it means that enforcement in cross‑licence disputes will depend heavily on that separate determination.
• No express penalty clauses in the guideline: The instrument contains no penalty provisions, no infringement fines, and no direct directions to ACMA to impose penalties. Penalties for causing interference, failing to comply with licence conditions, or other contraventions will be those set out in the Act, spectrum licences and other binding instruments.
• Practical enforcement implication: Because ACMA may take the instrument into account (s 7(5)), non‑compliance with the guideline’s coordination and modelling expectations (for example, failing to coordinate with registered fixed receivers, not using the subsection 145(4) protection level, failing to use suitable propagation modelling, or failing to liaise with space/earth station operators) can be expected to weaken a licensee’s position in any ACMA determination about interference even if the guideline itself does not directly create a sanction.

For practitioners advising clients, the key enforcement takeaway grounded in the instrument is that the guideline is administratively consequential: compliance with the guidance and with the RALI/ITU materials it points to is relevant to ACMA’s determinations and to the practical enforcement outcomes that flow from those determinations under the Act or via licence conditions.

The instrument intentionally cross‑references a network of legislative instruments, licence regimes, technical standards, and the Register. Its practical operation is therefore inseparable from the Act, the spectrum plan and the suite of RALI and ITU‑R instruments that supply technical criteria. The instrument itself governs only inasmuch as ACMA chooses to take it into account under the Act (s 7(5)). The statutory and instrument interactions are as follows.

Interaction with the Act and other determinations

• Authority under the Act: The instrument is made under s 262 of the Act (s 3). That situates it within the Act’s instrument‑making powers and subjects it to the Act’s administrative framework, including the Register and ACMA’s powers to determine interference under the Act and related determinations.
• Incorporation of defined terms and other instruments: The instrument imports definitions from the Radiocommunications (Interpretation) Determination 2015 (or its replacement instruments) and from the spectrum plan for certain terms (s 5(2)-(5)). It also states that references to other legislative instruments are references to those instruments as in force from time to time (s 6(a)). Practically, that means the guideline must be read with evolving definitions and may change in practical effect as those other instruments are updated.
• Subsection 145(4) determination tie‑in: The instrument repeatedly references the Radiocommunications (Unacceptable Levels of Interference - 2.3 GHz Band) Determination 2024 (the subsection 145(4) determination) as a central technical determinant (s 5, s 20(1), s 21(2)(b)). That determination will establish the formal criteria for what is an “unacceptable level of interference” in the context of the Act. The guideline therefore defers the legal boundary between acceptable and unacceptable interference to that separate determination.

Relationship with RALI instruments and ITU recommendations

• RALI instruments as the technical backbone: The guideline directs licensees to RALI FX 3 for fixed services protection criteria (ss 8-9), RALI FX 21 for TOB coordination and protection (ss 14-15), and RALI MS 31/32/37 for radio astronomy, ARQZWA and SRS earth station coordination (s 5 definitions and ss 11, 19). RALI instruments are ACMA technical instructions that contain the detailed procedures and protection ratios used in assignments and coordination; the guideline makes those documents the operative technical references for licence planning.
• ITU‑R Recommendations and international law: The guideline lists and directs licensees to ITU‑R Recommendations (e.g. P.1144, P.526, SF.1006, SA.* family) for propagation modelling and protection criteria (ss 7(4), 11(2), 11(5), 21 note). These ITU recommendations are not domestic law by themselves but are cited as internationally recognised technical methods that ACMA expects licensees to consider. The guideline also references Annex 7 to Appendix 7 of the Radio Regulations for earth receive station protection (s 11(1)), which is a direct citation to an ITU instrument.

Interaction with licence conditions and the Register

• Licence conditions may create binding obligations: The guideline explicitly notes that some 2.3 GHz spectrum licences may have licence conditions requiring compliance with particular ITU‑R or RALI documents (s 11 notes). Where a licence condition requires compliance, the obligation is legally binding under the Act; the guideline serves as an interpretative and practical companion.
• Register entries and protection rights: The guideline ties protection for certain services (notably TOB) to site details included in the Register and to the sequence of registration relative to spectrum licence entries (s 15(1)). This embeds administrative sequencing and registration practice as determinants of protection rights.

Interaction with ARQZWA and exclusion zones

• The guideline records the exclusion from the geographic area of 2.3 GHz spectrum licences of an area within 70 km of the Boolardy radio astronomy site inside ARQZWA (s 18(2)). That exclusion directly interacts with spectrum licensing geography under the spectrum plan and the Radiocommunications (Australian Radio Quiet Zone Western Australia) Frequency Band Plan 2023.

Practical implication of cross‑references

• Because the guideline refers to many external instruments and to evolving RALI and ITU‑R documents, its practical legal effect is to function as an integrative pointer that channels licence planning and dispute resolution towards those other instruments. Section 6 reinforces that references to other legislative instruments are to be read as in force from time to time (s 6). In practice, then, compliance requires tracking not just this guideline but the current versions of RALIs, ITU‑R recommendations and the Register content.

For practitioners, the important reading is that the guideline does not operate in isolation. Where it refers to binding licence conditions, or where ACMA relies on it in a determination under the Act, the outcomes will be driven by the Act and by the specific RALI/ITU instruments cited. The guideline’s role is advisory and integrative, but materially consequential because ACMA may treat it as a relevant factor in formal decisions (s 7(5)).

The instrument records a simple and recent amendment history within its text. The key points are:

• New instrument and commencement: The Radiocommunications Advisory Guidelines (Managing Interference from Spectrum Licensed Transmitters - 2.3 GHz Band) 2024 are established by this instrument and commence on 31 March 2024 (s 2). The instrument is explicitly named in s 1.
• Repeal of predecessor: The instrument expressly repeals the Radiocommunications Advisory Guidelines (Managing Interference from Spectrum Licensed Transmitters - 2.3 GHz Band) 2013 [F2013L02143] (s 4). That is the only repeal or express amendment stated in the text.
• Continuity and references to updated instruments: Section 6 provides that references to other legislative instruments in this instrument are to those instruments as in force from time to time (s 6(a)). This procedural provision ensures that the instrument remains connected to updated RALI and ITU documents, but it is not itself an amendment of those instruments. The instrument also states that references to other kinds of instruments or writings are to the versions current from time to time (s 6(b)). Practically, that means the guidance will operate in tandem with future RALI updates without needing this guideline to be amended each time a RALI is revised.
• Relationship to other determinations: The instrument relies on the Radiocommunications (Unacceptable Levels of Interference - 2.3 GHz Band) Determination 2024 (the subsection 145(4) determination) for the device boundary criterion and protection levels (see ss 5, 20-21). The instrument notes that the subsection 145(4) determination is available on the Federal Register of Legislation (s 5). That indicates a contemporaneous pair of instruments in 2024 that together replace or update older arrangements from the 2013 guideline era.
• No internal amendment clauses: The supplied text contains no internal amendment clauses or schedules amending other instruments. It functions as a stand‑alone guideline and as a point of integration with other primary and technical instruments.

Because the instrument repeals the 2013 guidelines and ties its operation to RALI and ITU‑R materials (and to the subsection 145(4) determination), the practical amendment history to monitor for compliance is not only changes to this guideline itself but also to RALI FX 3, FX 21, MS 31/32/37, the subsection 145(4) determination and the ITU‑R recommendations cited. Section 6 makes clear that references follow the versions “from time to time,” so updates to those instruments will alter how this guideline is to be applied without requiring an immediate amendment to this guideline text.

The supplied instrument text contains no references to case law, litigation, tribunal determinations, or any judicial interpretation either before or after its making. The instrument names no cases and records no prior disputes decided under it. It is a guidance instrument dated 2024 that repeals the 2013 guideline; any litigation history relevant to the matters covered would therefore be external to the text provided.

What the instrument does tell the reader about dispute resolution and the context in which litigation could arise is limited to administrative processes and reference instruments:

• ACMA’s role in determinations: The instrument expressly permits ACMA to take it into account when determining whether a transmitter is causing interference (s 7(5)). That signals that disputes about unacceptable interference will be addressed initially through ACMA’s administrative processes under the Act and the subsection 145(4) determination; such determinations could subsequently be subject to merits or judicial review in the courts or tribunals under the Act’s review mechanisms, though the instrument does not spell out those procedures.
• Reliance on other binding instruments: Because licence conditions may require compliance with ITU‑R SF.1006 or RALI MS 37 (s 11 notes), any dispute about whether a licensee complied with such a licence condition could be litigated on the basis of those conditions and the technical instruments they incorporate.
• Register and sequencing disputes: The guideline identifies that protection for TOB receivers depends on registration and the timing of entries (s 15(1)). Disputes about registration priority, the content of Register entries, or whether a particular receiver is afforded protection are the types of factual and administrative questions that could lead to formal dispute processes.

Because the instrument itself is an ACMA guideline and the text contains no litigation history, practitioners must look to ACMA decisions, the Act’s enforcement and review provisions, the subsection 145(4) determination, and case law external to this text for precedent on how these issues have been adjudicated in practice. The instrument’s citation of other instruments and the Register means that any litigation would be likely to turn on application of those documents as much as on this guideline itself.

The instrument contains several practical traps for licensees, apparatus holders and advisers. These are not legal “surprises” in the sense of hidden clauses, because they are spelled out in the text, but they are points where a mistaken operational assumption could create regulatory exposure or planning failure. The principal “gotchas” to watch for, with the textual grounding, are:

1. Advisory language versus binding obligations

   • The guideline often uses non‑mandatory language , “should,” “are to provide,” and “encourages direct liaison” , which can lead operators to assume there is no practical consequence to non‑adherence. However, ACMA may take the instrument into account when determining whether a transmitter is causing interference (s 7(5)). That means failure to follow the guideline’s recommended steps (modelling, coordination, use of RALI/ITU materials) can be prejudicial to a licensee in an ACMA interference determination even if the guideline itself lacks penalty provisions.

2. Confusion about what is binding: licence conditions and RALI instruments

   • The guideline directs licensees to RALI and ITU‑R documents but also notes that some spectrum licences may have licence conditions requiring compliance with specific documents (s 11 notes). Practitioners must check the text of individual licences: the guideline’s recommendations are not necessarily equivalent to the licence holder’s binding legal obligations, which might be stricter or different.

3. Register dependence for protection rights (TOB protection and timing)

   • TOB receivers are protected only if their site details are included in the Register and the apparatus licence predated the 2.3 GHz spectrum licence entry (s 15(1)). If a TOB operator fails to register, it may lose protection. Conversely, spectrum licensees must check Register contents and timing to know which TOB receivers are afforded protection. Misreading or ignoring Register sequencing can lead to disputes where a licensee assumed it had no protection obligations but ACMA finds otherwise on the basis of Register entries.

4. Device boundary versus negotiation

   • The subsection 145(4) determination’s device boundary criterion is the primary method for managing interference between geographically adjacent 2.3 GHz licences (s 20(1)). But the guideline also states that negotiation between licensees may be necessary (s 20(2) and s 7(6)), so licensees cannot rely exclusively on the device boundary rule in all circumstances. They must be prepared to negotiate or adapt where the criterion does not resolve potential harmful interference.

5. ARQZWA exclusion and geographic planning

   • The Boolardy site protection, and the exclusion of an area within 70 km from the geographic area of 2.3 GHz spectrum licences, is a hard geometric consequence that affects spectrum availability and planning in that region (s 18(2)). Licensees planning in WA must map and understand that exclusion to avoid allocation errors.

6. The “no‑protection/no‑interference” class licence reality

   • The LIPD class‑licence regime is generally run on a “no‑interference, no‑protection” basis (s 16). The guideline states that 2.3 GHz transmitters operated in accordance with licence conditions are generally taken not to cause unacceptable interference to LIPD receivers (s 17). Licensees may misinterpret this as a blanket right not to be required to mitigate interference; in reality, operational circumstances, Register entries and licence conditions may create exceptions.

7. Reliance on up‑to‑date RALI and ITU‑R documents

   • The guideline points practitioners to RALI FX 3, RALI FX 21, RALI MS 31/32/37 and a suite of ITU‑R Recommendations, and it notes that RALI instruments are subject to continuing review (s 8(2); s 6). Failure to use the current version of these referenced documents can lead to a mismatch with ACMA expectations. Section 6 makes clear references to other legislative instruments are references to them “as in force from time to time” (s 6(a)).

8. Potential mismatch between modelling assumptions and ACMA expectations

   • The guideline instructs the use of a suitable propagation model and cites ITU‑R P.526 as an example (s 21 note). If licensees use less conservative models, ignore terrain, or fail to document modelling inputs, ACMA may judge those modelling choices as inadequate in an interference determination (s 7(5) and s 21(2)(c)-(d)).

9. Expectation management for AMT receivers

   • The instrument states that if a 2.3 GHz transmitter is operated in accordance with licence conditions, it is not taken to cause unacceptable interference to apparatus‑licensed fixed receive stations used for AMT in 2200-2290 MHz (s 13). That protects compliant spectrum operation but may leave AMT operators expecting higher levels of protection than are practically required by the guideline absent licence conditions imposing them.

10. Fragmentation of technical requirements across instruments

• Technical protection criteria are spread across RALI instruments, the subsection 145(4) determination, ITU‑R Recommendations and the spectrum plan (multiple sections throughout). This fragmentation means compliance requires a coordinated read of many documents; relying on only this guideline is insufficient.

In short, the primary gotchas are failure to appreciate the guideline’s advisory but administratively consequential role, the Register and timing dependencies for protection, the interaction with licence conditions and RALI/ITU documents, and the need to use up‑to‑date technical models and well‑documented coordination processes. Each of those risks is identifiable directly in the provisions cited above.

The instrument prescribes recommended procedures and reference documents that, if followed and documented, will position a 2.3 GHz spectrum licensee to demonstrate to ACMA that it has “had regard to” the guidance and the referenced technical instruments. The steps below are practical, grounded in the instrument text, and designed to be defensible in an ACMA interference determination (s 7(5)).

1. Confirm the exact regulatory framework that applies to your licence

   • Check the spectrum licence text for any specific licence conditions requiring compliance with ITU‑R SF.1006, RALI MS 37 or other named documents (s 11 notes). If such a licence condition exists, compliance is mandatory; this guideline provides complementary guidance.
   • Identify whether your licence is a 2.3 GHz spectrum licence as defined (s 5).

2. Use the Register as the authoritative list for site protection and coordination

   • Before registering any transmitter, consult the Register for the presence of fixed receivers or TOB site entries that may be affected. The guideline instructs licensees to have regard to radiocommunications receivers included in the Register for other 2.3 GHz spectrum licences (s 21(1)).
   • For TOB sites, ensure that if you are a TOB operator you include site details in the Register to be afforded protection; conversely, spectrum licensees must consult the Register because only registered TOB receivers are protected and timing of registration matters (s 15(1)).

3. Follow the RALI instruments relevant to your planned operations

   • For fixed services below 2.3 GHz, plan to meet the protection criteria of RALI FX 3 (s 9). RALI FX 3 contains assignment criteria, channel plans and protection ratios used for microwave planning (ss 8-9).
   • For TOB services in the 2170-2300 MHz band, consult and follow RALI FX 21 for coordination and frequency assignment procedures (s 15(1)).
   • For radio astronomy notification and ARQZWA coordination, follow RALI MS 31 and MS 32 where applicable (s 19(2)-(3)).
   • For space research and SRS earth station blocking protection in 2290-2300 MHz, consult RALI MS 37 and any licence conditions that import it (s 11(3)).

4. Use the subsection 145(4) determination’s protection levels and device boundary criterion

   • Where planning could cause interference to fixed receivers included in the Register, use the protection level set out in the subsection 145(4) determination as the primary criterion for device boundary and interference assessment (s 21(2)(b); s 20(1)). Obtain and apply the Radiocommunications (Unacceptable Levels of Interference - 2.3 GHz Band) Determination 2024 for the precise protection threshold.

5. Model propagation carefully and document inputs

   • Use a suitable propagation model to model path loss between a planned fixed transmitter and each fixed receiver (s 21(2)(c)). The guideline gives ITU‑R P.526 “Propagation by diffraction” as an example of a suitable model (s 21 note). Ensure the model choice, input parameters (frequency, antenna patterns, heights, locations), terrain data, and any atmospheric assumptions are recorded.
   • Take account of terrain and other relevant factors as expressly required by the guideline (s 21(2)(d)).

6. Coordinate directly with affected operators in planning phases

   • The instrument encourages direct liaison between spectrum licensees and space/earth station operators and AUS87 radio astronomy operators during system planning (ss 10(4), 11(4), 19(2)). For fixed transmitters, coordinate with fixed receivers included in the Register before inclusion of the transmitter entry (s 21(1)-(2)).
   • If coordination indicates harmful interference may result, consider replanning (change site, power, antenna tilt, emissions mask) or negotiate mitigations with the affected licensee (s 21(3)(a)-(b)).

7. Be aware of service‑specific expectations

   • For AMT fixed receive stations in 2200-2290 MHz, if your transmitter is operated in accordance with its licence conditions you are “not taken to cause unacceptable interference” and need not afford additional protection to such a fixed receive station (s 13). Nonetheless, it is prudent to document licence compliance and any liaison.
   • For LIPD class‑licence receivers in 2400-2483.5 MHz, understand that operation is generally on a no‑interference/no‑protection basis; however, document any analysis showing your transmitter does not cause harmful interference (ss 16-17).
   • For radio astronomy receivers operating fortuitously under AUS87, follow RALI MS 31 notification and coordinate per RALI MS 32 if operating adjacent to the ARQZWA (s 19(2)-(3)). Map any exclusion areas (e.g. the 70 km exclusion around Boolardy) into your geographic planning (s 18(2)).

8. Maintain records to show you “had regard to” the guideline and referenced instruments

   • Because ACMA may take the instrument into account (s 7(5)), keeping contemporaneous records of Register checks, RALI/ITU sources consulted (including versions), propagation model inputs and outputs, correspondence with affected licensees, and any replanning decisions will materially strengthen your position in any later ACMA determination or administrative review.

9. Monitor updates to RALI and ITU‑R material and to the subsection 145(4) determination

   • Section 6 states that references to other legislative instruments are references to the instruments “as in force from time to time” (s 6(a)). Therefore, maintain a compliance process to detect updates to RALI FX 3/FX 21/MS 31/32/37, ITU‑R recommendations, the spectrum plan and the subsection 145(4) determination.

10. Where unable to avoid harmful interference, prepare to negotiate and escalate prudently

• If modelling and coordination indicate likely harmful interference that cannot be mitigated by replanning, the guideline recommends negotiation with the affected 2.3 GHz spectrum licensee (s 21(3)(b)). Document proposals, technical mitigations and offers. If negotiation fails, be prepared to bring the matter to ACMA’s attention, noting that ACMA will consider the guideline and its recommended procedures in any interference determination (s 7(5)).

Following these steps and documenting them creates a defensible compliance trail that aligns with the guideline’s structure: use the Register, follow the RALI and ITU standards cited, apply the subsection 145(4) determination where relevant, model propagation carefully and include terrain, and coordinate/liaise before registering transmitters. The instrument emphasises coordination and use of established technical instruments, and ACMA’s stated willingness to take the guideline into account makes this approach administratively prudent.