Band Plan Update
80 Metre Digimode Segments
For many years our 80 metre band plan has included a digital segment at 3620 - 3640 kHz. The original reason for adopting this segment was the licensing restrictions that applied at the time to Novice operators.
These restrictions no longer apply, so the band plan should be updated to bring it into line with accepted operating practices. In particular, we should if possible align our digimode segment with the IARU band plans.
At its last conference in October 2015, IARU Region III adopted 3580 - 3600 kHz as the recommended segment for digital modes. But this is not quite adequate for our needs, and there is already significant digital activity below 3580 kHz. In Regions I and II, and in New Zealand, the digimode segment is a more practical 3570 - 3600 kHz. It would be logical for us to adopt the same segment.
So, the proposal is to align our digimode segment with the rest of the world by moving it to 3570 - 3600 kHz. The existing digital segment at 3620 - 3640 kHz could then revert to SSB use. Existing SSB activity between 3535 and 3570 kHz would be unaffected. There would however be a need for existing SSB activity between 3570 and 3600 kHz to move further up the band.
Any comments on the above proposal will be gratefully received.
tac (at) wia.org.au
Digimode Segments on other HF Bands
There are several other HF bands where the digital segments in the Australian band plans are not fully aligned with the IARU plans applying in other countries. It is in our interests to harmonise these band plans.
A paper has been added to the web site giving details of the digital segments in the three IARU regional plans, alongside the current Australian plan. This paper also includes several recommendations for updating the digital segments of our plans.
Full details - see TAC Band Plans - HF Digimodes.pdf, in the "Files for Download" section below.
In brief, the recommended changes are:
80 Metres: Relocate digimode segment to 3570 - 3600 kHz.
30 metres: Extend the digimode segment to 20 kHz (10.130 - 10.150 MHz).
17 metres: Extend the digimode segment (currently only 10 kHz) to 18.095 - 18.120 MHz.
15 metres: Extend the digimode segment to 21.070 - 21.150 MHz.
12 metres: Extend the digimode segment (currently only 10 kHz) to 24.915 - 24.940 MHz.
10 metres: Realign the digimode segment to 28.070 - 28.190 MHz.
Comments on these proposals please to tac (at) wia.org.au.
30 Metre SSB Operation
There has been some discussion of interference problems that can occur on narrow bands such as 30 metres. This band is only 50 kHz wide and in most countries, the authorities have restricted the available operating modes to CW and narrow band digital modes.
Australia is a little different because ACMA appears to have the policy that if a mode can be used within the available spectrum of a particular band, it should be permitted. Thus we have, for example, SSB activity permitted in the 630 metre band, even though the whole band is only 7 kHz wide.
The resolution of any interference issues is largely a matter for amateurs to settle amongst themselves, and the best way of doing that is if we can develop band plans that give a fair share of band access to the various users of each band.
The 30 metre band is only 50 kHz wide, and in most countries the only permitted modes are CW and narrow band digital modes. However in Australia we are permitted to use SSB on this band. The inevitable result is interference problems.
Interference problems could be reduced by adopting some voluntary restrictions in the band plan. This has been done successfully on other bands. For example, on 630 metres the band plan recommends that SSB should be used only during daylight hours. This kind of provision could be adopted on 30 metres as well. Another option would be to recommend that SSB only be used within a restricted range of frequencies, for example 10120 - 10130 kHz.
Comments on this issue would be appreciated.
IARU Region III Band Plans Review
Further rationalisation of all HF band plans - not just 80 metres - is also on the agenda. Further details will be available on the Band Plans Data page of the WIA web site. IARU Region III is conducting a review of band plans with a view to harmonisation between Region III and the other two IARU regions. An interim report will be released for discussion by member societies in early 2017, then a final version will be presented to the next Region III conference in Seoul (2018).
Band plan changes in the past year
CHANGES TO THE 2 METRE BAND PLAN
Changes have been adopted for frequencies between 144.700 and 145.800 MHz. These changes include rearrangement of simplex channels and the provision of extra repeater allocations for use in cases where none of the regular channels is available.
Existing legacy repeater, IRLP and AX25 licences allocated prior to September 2015 may remain on their existing frequencies until the licensees choose to initiate a frequency change. Some long established special purpose simplex frequencies (e.g. ARDF) may also need to remain for some time.
Full details of the band plan changes are available in the "Files for Download" section.
CHANGES TO THE 70 cm BAND PLAN
Please note the band plan changes which have been adopted for the purpose of overcoming interference problems caused by LIPD ("Low Interference Potential" devices) in the band 433.050 - 434.790 MHz. These changes include rearrangement of simplex channels and the creation of a new repeater input segment.
Existing legacy repeater, IRLP and AX25 licences allocated prior to September 2015, and some long established special purpose simplex channels may remain on their existing frequencies until the licensees choose to initiate a frequency change.
Full details of the band plan changes are available in the "Files for Download" section.
RESTRICTIONS ON 3.4 GHz OPERATION
From July 2015, operation on frequencies between 3400 and 3575 MHz is prohibited in many parts of Australia (basically all major population centres). However operation is still permitted in country and remote areas. For full details, please refer to the latest ACMA Amateur Licence Conditions Determination.
The main impact is on the Narrow Band Modes segment. To avoid any confusion about where operation should take place, it is recommended that all weak signal activity should move to 3398 MHz.
Recent band plan issues
Over the past couple of years, in order of frequency
Please refer to the band plans for an interim plan for the 2200 metre (135.7 - 137.8 kHz) band.
The band plan has been updated with additional detail added. Full details are in the "Files For Download" section.
The following frequencies are based on current CW and digital activity in IARU Region I, and are recommended for DX activity.
CW 472.500 kHz - recommended centre frequency for international DX
WSPR 474.2 kHz USB dial frequency (occupied bandwidth 475.6 - 475.8 kHz)
ROS 476.0 kHz USB dial frequency (occupied bandwidth 477.4 - 477.6 kHz)
QRSS 476.175 kHz USB dial frequency (occupied bandwidth 477.175 - 477.185 kHz).
(Some activity also on 478.9 kHz)
WSJTX 477.0 kHz USB dial frequency (occupied bandwidth 478.0 - 478.5 kHz)
Opera 477.0 kHz USB dial frequency (occupied bandwidth 478.5 - 478.8 kHz)
SSB operation is also permitted, with a maximum occupied bandwidth of 2.1 kHz. However it is not possible to run SSB without overlapping frequencies that are used for CW or digital modes. Users of this band will need to exercise tolerance and restraint. One suggested approach is that SSB operators voluntarily restrict their activities to daylight hours.
The two SSB frequencies listed below are possible options that have been suggested. The frequencies given assume the use of LSB mode and an audio bandwidth of 300 - 2400 Hz.
479.3 kHz LSB dial frequency (occupied bandwidth 476.9 - 479.0 kHz).
476.0 kHz LSB dial frequency (occupied bandwidth 473.6 - 475.7 kHz).
HF Bands - Recommended IARU Region III centre frequencies for emergency operation
IARU Region III has adopted the following frequencies as recommended emergency centre of activity frequencies: 3.600, 7.110, 14.300, 18.160 and 21.360 MHz. As an IARU member society, the WIA has adopted these recommended frequencies.
"Centre of Activity" frequencies are not spot frequencies or net frequencies. They are recommended as starting points for emergency traffic which may extend 5 kHz above or below the designated centre frequency.
The 6 metre band plan has had some additions:
50.000 - 50.030 MHz - Reserved for future international Synchronised Beacon Project
50.240 - 50.280 MHz - Recommended for Chirp beacons with bandwidths 2 - 20 kHz.
50.320 - 50.400 MHz - Reserved for upward expansion of the beacon segment.
50.400 - 50.500 MHz - Reserved for propagation studies:
Guard band for proposed new Region I beacon segment.
Recommended for Chirp beacons with 20 - 100 kHz bandwidth.
50.500 -52.000 MHz - Still tagged "All Modes" for maximum future flexibility. Possible use of all or part when the availability of the full 50 - 54 MHz band is confirmed.
Any comments on future uses of the band are most welcome.
Revised CTCSS Standards
Changes were made to the standard CTCSS tones to be used for repeater access and linking.
Our licence conditions require tone access for repeaters that are linked to repeaters in certain other bands, to prevent transmissions from being relayed on frequencies that the operators are not entitled to use. CTCSS is also used to activate selective linking or for interference protection.
The following CTCSS tones have been adopted for repeater access:
91.5 Hz: For use with repeaters fitted with CTCSS for interference protection.
141.3 or 146.2 Hz: To activate links to repeaters on other VHF/UHF bands.
85.4 Hz: To activate links to other bands that some operators are not permitted to use.
The previously recommended 123 Hz tone is no longer recommended for future repeaters due to problems with false detecting.
The band plans were updated to include revised standards for DVB tranmssion.
Overseas band plan information
IARU Region I: click this Link to the IARU Region I web site.
IARU Region II: click this Link for details of the Region II MF and HF band plans.
IARU Region III: click this Link for Region III band plan information.
New Zealand: click this Link for band plan information from the NZART.
Japan: click this Link for information on band plans in Japan.
You can provide your feedback via the following Link
Files For Download
Page Last Updated: Monday 16 January 2017 at 22:39 hours