CTCSS stands for Continuous Tone Coded Squelch System, basically it is exactly the same tones that a telephone keypad has when operating menus in an automated system. In order to open a repeater you need the correct tone.
CTCSS tone letter codes. | ||
---|---|---|
Tone A = 67.0Hz | Tone B = 71.9Hz | Tone C = 77.0Hz |
Tone D = 82.5Hz | Tone E = 88.5Hz | Tone F = 94.8Hz |
Tone G = 103.5Hz | Tone H = 110.9Hz | Tone J = 118.8Hz |
(S) special case 100.0Hz GB3FM |
CTCSS by County allocation. | |||
---|---|---|---|
County | Tone | Frequency | |
A | Aberdeenshire | A | 67.0 Hz |
Angus | F | 94.8 Hz | |
Anglesey | H | 110.9 Hz | |
Antrim | H | 110.9 Hz | |
Argyll and Bute | G | 103.5 Hz | |
Avon | J | 118.8 Hz | |
Ayrshire | G | 103.5 Hz | |
B | Bedfordshire | C | 77.0 Hz |
Berkshire | J | 118.8 Hz | |
Border Counties | J | 118.8 Hz | |
Buckinghamshire | C | 77.0 Hz | |
C | Cambridgeshire | F | 94.8 Hz |
Caithness | C | 77.0 Hz | |
Channel Islands | B | 71.9 Hz | |
Cheshire | G | 103.5 Hz | |
Cleveland | J | 118.8 Hz | |
Clwyd | H | 110.9 Hz | |
Cornwall | C | 77.0 Hz | |
Cumbria | C | 77.0 Hz | |
D | Derbyshire | B | 71.9 Hz |
Devon | C | 77.0 Hz | |
Dorset | B | 71.9 Hz | |
Down | H | 110.9 Hz | |
Dumfries and Galloway | G | 103.5 Hz | |
Durham | J | 118.8 Hz | |
Dyfed | F | 94.8 Hz | |
E | Essex | H | 110.9 Hz |
F | Fermanagh | H | 110.9 Hz |
Fife | F | 94.8 Hz | |
G | Glamorgan | F | 94.8 Hz |
Gloucestershire | J | 118.8 Hz | |
Greater London | D | 82.5 Hz | |
Greater Manchester | D | 82.5 Hz | |
Gwent | F | 94.8 Hz | |
Gwynedd | H | 110.9 Hz | |
H | Hampshire | B | 71.9 Hz |
Hereford and Worcester | J | 118.8 Hz | |
Hertfordshire | D | 82.5 Hz | |
Highland (West Coast and Islands) | E | 88.5 Hz | |
Highland (East Coast) | A | 67.0 Hz | |
Humberside | E | 88.5 Hz | |
I | Isle of Man | H | 110.9 Hz |
Isle of Wight | B | 71.9 Hz | |
K | Kent | G | 103.5 Hz |
L | Lanarkshire | G | 103.5 Hz |
Lancashire | D | 82.5 Hz | |
Leicestershire | C | 77.0 Hz | |
Lincolnshire | B | 71.9 Hz | |
London | D | 82.5 Hz | |
Londonderry | H | 110.9 Hz | |
Lothians | F | 94.8 Hz | |
M | Merseyside | D | 82.5 Hz |
N | Norfolk | F | 94.8 Hz |
Northamptonshire | C | 77.0 Hz | |
Northern Isles | C | 77.0 Hz | |
Northumberland | J | 118.8 Hz | |
North Yorkshire | J | 118.8 Hz | |
Nottinghamshire | B | 71.9 Hz | |
O | Orkney | C | 77.0 Hz |
Oxfordshire | J | 118.8 Hz | |
P | Perthshire | F | 94.8 Hz |
Powys | G | 103.5 Hz | |
S | Shropshire | G | 103.5 Hz |
Somerset | C | 77.0 Hz | |
South Yorkshire | B | 71.9 Hz | |
Staffordshire North | G | 103.5 Hz | |
Staffordshire South | A | 67.0 Hz | |
Suffolk | H | 110.9 Hz | |
Surrey | D | 82.5 Hz | |
Sussex (East and West) | E | 88.5 Hz | |
T | Tyne and Wear | J | 118.8 Hz |
Tyrone | H | 110.9 Hz | |
W | Warwickshire | A | 67.0 Hz |
West Midlands | A | 67.0 Hz | |
West Yorkshire | D | 82.5 Hz | |
Wiltshire Northern | J | 118.8 Hz | |
Wiltshire Southern | B | 71.9 Hz | |
Worcestershire | J | 118.8 Hz |