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Roger Barker <[email protected]
The following is a copy of a packet message sent to DCCINF@GBR by G1DVU on
behalf of the DCC. Apart from the use of 144.800, please note the comment about whether "unconnected nets" users have a requirement for a 70cm frequency. ** From :G1DVU @GB7SXE.#38.GBR.EU To :DCCINF@GBR Date/time :18-Jun 21:36 Title :DATA BANDPLAN CHANGES Subsequent to the extensive consulation exercise, and after careful consideration of all input received, the Data Communications Commitee has agreed with the VHF Committee the following changes within the 4M, 2M and 70 CM bands: 4M ===== 70.3625, 70.3875, 70.4125 and 70.4375 MHz will be marked as 'Digital Modes'. 2M ====== From input received regarding the use of both 144.500 and 144.700 MHz, it became apparent that a different solution needed to be sought to find an accomodation for the 'unconnected net' traffic (APRS, UIView, et al) within the current spectrum allocated to digital communications. As a result, DCC proposed that one of the 9600 bps channels (144.825 MHz) may be redesignated as 3 x 12.5 kHz channels, and that 144.8125 MHz would then be recommended for such use. Again, from input received, it is apparent that the UK users of amateur digital communications believe that the loss of this particular channel would have far reaching implications upon the growth potential for high speed network access facilities. With this in mind, and considering input received from Holland (who also sent comments regarding Germany and Belgium), the VHF Committee has recommended that 144.800 MHz now be marked as 'unconnected nets'. DCC is pleased to report that, given all available information, it is entirely in agreement with VHF Committee's recommendations. Users of 144.800 MHz for digital communications are reminded that their FM deviation should be adjusted to a MAXIMUM of +/- 2.3 kHz in order to prevent interference to users of 144.7875 MHz (within the 'all modes section) and 144.825 MHz. However, the pressure upon user access frequencies within the 2M band remains high, and in order to provide further scope, it is now envisaged that - subject to local agreement - 144.825 MHz may need to be shared by both 1200 bps and 9600 bps stations. Additionally, it is forseeable that Mailbox NoV's might now be issued to include 144.9125 MHz. 70CMS ===== After further detailed consultation with various interested organizations (including BATC), the RSGB's VHF Committee has agreed an additional allocation for digital modes at 433.800 - 434.250 MHz. In order to reduce the potential for interference to ATV users, only vertical polarisation should be employed in this sub-band. DCC welcomes this additional allocation, and has nominally agreed that 433.800 - 434.000 MHz will be allocated as "user" frequencies, while 434.000 - 434.250 MHz will be allocated as "linking" frequencies. To enable detailed planning to take place, it would be helpful for DCC to know whether the "unconnected nets" users have a perceived requirement for an allocation within the 433.800 - 434.000 MHz segment. No further changes are proposed to any of the above bands without further detailed consultation. Should you require more information, or wish to comment further, please address your messages to either the DCC Chairman: G0RDI@GB7SXE.#38.GBR.EU or by EMail to: bandplan@... Martin Green G1DVU DCC UK Mailbox Coordinator --------------------------------------------------------------------------- Martin Green G1DVU/M0BMD @ GB7SXE - Internet, marting@... Telephone 01424-755192 (Not after 10-00pm!) Fax 01424-755916, Mobile 0850-072652 --------------------------------------------------------------------------- ** -- Roger Barker, G4IDE roger@... Boston, UK |
