DCC recognises that some systems are currently licenced on the basis that they do/will employ 50 kHz bandwidth. These systems may continue to operate, but no additional 50 kHz applications will be accepted or granted, effective immediately.
Such a decision has the advantage that a useful number of 25 kHz frequencies which had previously been "lost" are once again available, including some which fall within the current "block cleared" segments of the band.
Every effort will be made to protect the current 50 kHz users, but inevitably there may be some co-channel issues which arise in areas where linking frequencies are under pressure from vast data volumes. Groups who are employing 50 kHz bandwith schemes are urged to research alternatives which might provide a better "fit" into the band plan while maintaing high speed bit rate capabilities.
Unless otherwise noted, all are 25 kHz channels and channel spacing.
430.000 to 431.0000
430.0000...................Sub-Band Edge 430.0125 } 430.0250 } 430.0375 } 430.0500 } .............12.5 kHz Spacing 430.0625 } 430.0750 } 430.0875 } 430.1000 430.1250 430.1500 430.1750 430.2000 430.2250 430.2500 430.2750 430.3000 430.3500 430.3750 430.4000 430.4250 RX}..............Used by 50 kHz regenerative nodes 430.4750 TX} 430.5125 RX}..............Used by 25 kHz regenerative nodes 430.5375 TX} 430.5625 } 430.5750 }................12.5 kHz Spacing 430.5875 } 430.6000 430.6250 430.6500 430.6750 430.7000 430.7250 430.7500 430.7750 430.8000 430.8250 }................Emergency communications priority 430.8500 430.8750 430.9000 430.9250 430.9500 430.9750 431.0000.....................Sub-band Edge
431.000 to 431.9900 This band is not available within a 100 km radius of Charing Cross, London 431.0000.....................Sub-band Edge } }.........................Consult with DCC before considering use of this band } 431.9900.....................Sub-band Edge
432.600 to 432.700 432.600.....................Sub-band Edge. 432.625...................High Speed AX25 & TCP/IP User Access ONLY 432.650...................AX25 User Access ONLY 432.675...................AX25 User Access ONLY 432.700......................Sub-band Edge
433.600 to 433.800 433.600......................Sub-band Edge 433.625...................TCP/IP User Access ONLY 433.650...................AX25 User Access ONLY 433.675...................DX Cluster User Access ONLY 433.700...................Emergency communications priority, 12.5 kHz
Please note that of the 433.800 to 434.250 MHz assignments below are NOT covered by the existing Agency Mailbox Agreement, and therefore may NOT be issued on a Mailbox NoV without recourse to the RA's Frequency Clearance Process.
433.800 to 434.000 433.8000...................Recommended for Unconnected Net traffic 433.825...................TCP/IP User Access, 4800 bps or faster 433.850...................AX.25 User Access, 4800 bps or faster 433.875...................DX Cluster User Access, 4800 bps or faster 433.900...................DX Cluster User Access, 1200 bps 433.925...................1200 bps traffic, subject to local coordination 433.950...................Experimental digital modes 433.975...................Experimental digital modes
434.000 to 434.250 434.000 MHz Linking only. Subject to local coordination. to Speeds of 4800 bps or faster. Vertical polarisation to minimize impact to ATV users. 434.250 MHz Two frequency (full- or half-duplex) with 430 / 431 MHz to be encouraged.
439.600 to 440.000 439.6000.......................Sub-band Edge. 439.6250 TX}................Used by 50 kHz regenerative nodes 439.6750 RX} 439.7125 TX}................Used by 25 kHz regenerative nodes 439.7375 RX} 439.7625 } }..................12.5 kHz spacing 439.7875 } 439.8000 439.8250 439.8500 439.8750 439.9000 439.9250 439.9500 439.9750 440.0000........................Band Edge.
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This page was last updated 4 December 1999