New Draft Australian 40M Band Plan
The WIA has developed a new draft band plan for the 40m (7 MHz) amateur band.
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The new plan is designed to
encourage activity above 7100 kHz;
stimulate experimentation in wideband digital modes; and
integrate, as far as is possible, with the IARU region 3 plan, and the plans of other countries.
No existing nets will be affected by the plan.
The underpinning philosophy of the plan is to define band usage in terms of necessary bandwidth, rather than by mode. However, it is recognised that some modes are incompatible, such as analogue voice and data. Accordingly, these modes are each assigned their own sections in the plan.
Features of the new plan include:
A new broadcast segment from 7130-7150 kHz. This will provide a defined area for weekly broadcasts.
A new wideband data modes segment from 7180-7250 kHz, which is further sub divided into unattended/automated and attended segments. The subdivision serves to prevent interference between automated and non-automated stations.
Redefinition of the CW segment (7-7030 kHz) to a narrow band modes segment with a maximum necessary bandwidth of 200 Hz. This means, in effect, that the previously exclusive CW segment will be shared with PSK31 and other very narrow band data modes.
The change to the previously exclusive CW segment is in accordance with evolving international practice. It is worth noting that the ZL 40m band plan has had a CW/PSK sharing arrangement in place for some time. Moreover, CW/PSK sharing is proposed under the new US 40m band plan.
The new draft 40m band plan is detailed as follows:
7000-7030 -> Very narrow band modes (maximum necessary b/w 200 Hz)
7030-7040 -> Narrow band digital (maximum necessary b/w 2 kHz)
7040-7180 -> Analogue telephony (maximum necessary b/w 8 kHz as per the LCD)
7130-7150 -> Broadcast sub-segment
7180-7190 -> Wideband digital, unattended (maximum necessary b/w 8 kHz as per the LCD)
7190-7250 -> Wideband digital (maximum necessary b/w 8 kHz as per the LCD)
7250-7300 -> Analogue telephony (maximum necessary b/w 8 kHz as per the LCD)
Obviously, the current levels of broadcast station interference above 7100 kHz will mean that some degree of flexibility is required in use of the new band plan.
The plan is designed to be fully implemented once 7100-7200 kHz reverts to amateur primary use in 2009.
The plan is open for comment for the next four months. The comment period closes on April 30, 2006.
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