A small number of beacons located on the Atlantic coast have been allocated frequencies within the beacon band. Strictly speaking the beacon band encompasses 144.400-144.490MHz with a 10 kHz guard band up to 144.500MHz. Such transmissions cause severe interference to weak-signal users listening for far away beacons. Please do not transmit in this segment especially if you are using FM equipment. This area of the band is specifically allocated for propagation beacons only. Meteorscatter (MS) modes such as FSK441 around 144.370 is another example of DX activity that can be found in this segment. Stations using SSB call CQ on or around 144.300MHz a key ‘Centre of Activity’. This is the main area where all the DXers (and casual) operators make long-distance contacts. This is where you will find Morse (CW), telephony (SSB) and machine generated mode (MGM) activity such as JT65 and FSK441. Narrow-band modes with a maximum bandwidth of 2.7 kHz are always found at the low frequency end of any VHF or UHF allocation. The top 50 kHz of this range is shared with narrow MGM and Earth-Moon-Earth (EME) activity (typically using JTxx modes). Morse operation is centred on 144.050MHz. This 125kHz wide range is allocated to modes with a maximum transmission bandwidth of 500Hz shared between CW and narrow bandwidth MGM. The bottom 75 kHz is allocated exclusively to CW operation. Users of satellites need to account for Doppler shift to ensure they stay inside the bottom band edge. The maximum transmission bandwidth is of 2.7 kHz. This 25kHz wide sub-band has been made all-modes so it can be shared with the downlinks from new amateur satellite linear transponders. A machine generated mode (MGM) indicates those transmissions relying fully on computer processing, for example FT8, FSK441, JT65B, WSPR or PSK31. CW telegraphy, SSB/FM/DV telephony, or machine generated mode) allowed in a segment. The mode indicates the modulation methods (e.g. The ncessary transmission bandwidth determines the maximum spectral width of emissions recommended in a sub-band. These frequencies are not part of the adopted 144MHz IARU Region 1 Band Plan and although in the normal amateur spirit other operators should take notice of these agreements, no right on reserved frequencies can be derived from a mention in the usage column. operators practising specific modes of communication.
It contains meeting/calling frequencies agreed upon for the convenience of the VHF. The ‘Usage’ column indicates the main usage of a sub-band or segment. Users must therefore take into account the bandwidth of their sidebands when selecting an operating frequency. The allocation of sub-bands enables the indicated category of users to employ any frequency within that sub-band provided that no appreciable energy falls outside that sub-band.
The plan shows the frequency limits of individual ‘sub-bands’ or segments. The 144MHz UK band plan is based on the International Amateur Radio Union (IARU) Region-1 band plan. The philosophy behind band planning is that it assigns frequencies for certain activities in such a way that all current users can practice the various modes of amateur radio with a minimum of mutual interference. Schedule-2 of the Ofcom licence conditions includes a restriction on unattended use near Scarborough.
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The power limit for Full Licensees is 400W (26dBW), Intermediate Licensees power limit is 50W (17dBW) and Foundation Licensees power limit is 10W (10dBW). In the UK the 144MHz band between 144.0-146.0MHz is allocated to the Amateur Service and Amateur Satellite Service with Primary status. 144MHz Band: 144.0 – 146.0MHz 144MHz Band Licence Conditions
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