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At the request of the Data Communications Committee, during 1998 the VHF Committee began a review of
the utilisation of the 4M (70.0 - 70.5 MHz) and 70CM (430 - 440 MHz) bands in an attempt to balance
the needs of the current users against the published plans for those bands. Additionally, some proposals
for some changes to the 2M (144 - 146 MHz) band were to be considered, and in particular clarification
regarding the use of 144.800 MHz, which has been assigned as "digital modes" since the the 1996 Tel Aviv
Region 1 Conference.
Towards the end of 1998 it became apparent that a number of key digital node sites would be lost due to increases in site rental costs. Both VHFC and DCC sought solutions which would provide additional spectrum allocations for digital communications which would ease the provision of replacement (and additional) facilities for those which are under threat. The new band plans achieve this objective while providing allocations which are proportionate to the current and projected use of the bands. Additionally, work with the Repeater Management Committee has enabled certain frequencies within the repeater sub bands to be prioritised for Emergency Communications use. Effective 1st March 1999, the affected portions of those band plans will be:- |
| 50 MHz | |
| 50.7500 | Emergency Communications Priority [*] |
| 51.2100 | Prority for Emergency Communications DELETED |
| 51.2500 | Emergency Communications Priority [*] |
| [*] This channel pair is allocated for emergency communications talkthrough operations, subject to RMC approval. | |
| 70 MHz | |
| 70.3000 | RTTY Calling / Working |
| 70.3125 | Digital Modes |
| 70.3250 | AX.25 DX Cluster User Access / Linking |
| 70.3375 | Digital Modes |
| 70.3500 | Digital Modes. Emergency communications priority. |
| 70.3625 | Digital Modes [*] |
| 70.3750 | Digital Modes [*] |
| 70.3875 | Emergency communications priority |
| 70.4000 | Emergency communications priority |
| 70.4125 | Emergency communications priority |
| 70.4250 | FM simplex |
| 70.4375 | FM simplex |
| 70.4500 | FM calling |
| 70.4625 | Digital Modes [*] |
| 70.4750 | Digital Modes [*] |
| 70.4875 | Digital Modes |
| [*] DCC will recommend utilisation of these frequencies at a later date. | |
| 144 MHz | |
| 144.6750 | Emergency communications priority. |
| 144.8000 | Digital Modes. Emergency communications priority. |
| 145.7900 | Point-to-point links. 16 kHz *maximum* bandwidth. Subject to VHFC/RMC approval on a case-by-case basis |
| 430 MHz | |
| 430.0000 | |
| to | Digital Communications [*] |
| 431.9900 | |
| 430.8250 | Emergency Communications Priority [+] |
| 432.6000 | |
| to | Digital Communications |
| 432.7000 | |
| 432.7250 | Emergency Communications Priority |
| 432.7500 | Emergency Communications Priority |
| 432.7750 | Emergency Communications Priority |
| 433.6000 | |
| to | Digital Communications [*] |
| 433.8000 | |
| 438.0250 | |
| to | Digital Communications [*] |
| 438.5250 | |
| 438.4250 | Emergency Communications Priority [+] |
| 439.6000 | |
| to | Digital Communications |
| 439.9990 | |
| [*] DCC will recommend utilisation of these frequencies at a later date. | |
| [+] This channel pair is allocated for emergency communications duplex digital operations, subject to DCC approval. | |
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Site created and maintained by Steve Morton.
The information contained within is deemed to be accurate at the time of writing.
©1998-2001 Steve Morton |