VHF Repeater Frequencies
In the UK, the 2 metre amateur band covers from 144 - 146
MHz. The frequencies allocated for repeater use range from
145.000 - 145.775 MHz and are listed in the following table.
All UK 2m repeaters have a -600 kHz offset between their
output and their input frequency. i.e. To use a 2m repeater,
you have to transmit a carrier 600 kHz LOWER than the repeater's
output frequency (assuming that any other access requirements
have been met. e.g. 1750Hz or CTCSS tones).
Chan
IARU
Input (MHz)
Output (MHz)
Repeaters
R0
RV48
145.000
145.600
GB3SS
R1
RV50
145.025
145.625
GB3NG, GB3PA
R2
RV52
145.050
145.650
GB3AY, GB3OC, GB3SB
R3
RV54
145.075
145.675
GB3LG, GB3LU, GB3PR
R4
RV56
145.100
145.700
GB3BT, GB3HI
R5
RV58
145.125
145.725
GB3AG, GB3BI
R6
RV60
145.150
145.750
GB3CS
R7
RV62
145.175
145.775
GB3DG, GB3GN, GB3IG
UHF Repeater Frequencies
The UK 70 centimetre amateur band covers from 430 - 440
MHz. The frequencies allocated for repeater use range from
433.000 - 434.975 MHz and are listed in the following table.
Most UK 70cm repeaters have a +1.6 MHz offset between their
output and their input frequency. i.e. To use a 70cm repeater,
you have to transmit a carrier 1.6 MHz HIGHER than the repeater's
output frequency (assuming that any other access requirements
have been met. e.g. 1750Hz or CTCSS tones).
Chan
IARU
Input (MHz)
Output (MHz)
Repeaters
RB0
RU240
434.600
433.000
GB3PU
RB1
RU242
434.625
433.025
GB3BA
RB2
RU244
434.650
433.050
GB3HK
RB3
RU246
434.675
433.075
GB3KA
RB4
RU248
434.700
433.100
GB3OH
RB5
RU250
434.725
433.125
None in Scotland
RB6
RU252
434.750
433.150
None in Scotland
RB7
RU254
434.775
433.175
None in Scotland
RB8
RU256
434.800
433.200
None in Scotland
RB9
RU258
434.825
433.225
GB3DM
RB10
RU260
434.850
433.250
GB3DD
RB11
RU262
434.875
433.275
None in Scotland
RB12
RU264
434.900
433.300
None in Scotland
RB13
RU266
434.925
433.325
None in Scotland
RB14
RU268
434.950
433.350
GB3AB, GB3ED, GB3GL,
RB15
RU270
434.975
433.375
None in Scotland
CTCSS Frequencies
Continuous Tone Controlled (or Coded) Squelch System (CTCSS)
is a method of transmitting a sub-audible frequency along
with your normal audio transmission. It is extensively used
in the commercial world and in recent years, more and more
amateur repeaters are being fitted with it.
The system allows the user to "activate" the
repeater simply by keying the microphone and automatically
sending a predetermined tone as opposed to the conventional
method of sending a 1750Hz (audible) tone of the correct
deviation and time duration on the initial access.
CTCSS also permits a number of stations to operate on the
same frequency without interference as each "Net"
will only respond to it's allocated tone.
The UK is split up into Frequency Zones and this map shows
the recommended frequency for a particular area of operation.
N.B. The use of CTCSS is not compulsory and although the
table below shows what frequencies are allocated to the
Scottish repeaters, not all repeaters may have the function
enabled.
Tone
Freq. (Hz)
Repeaters
A
67.0
GB3AB, GB3BA, GB3BI, GB3GN, GB3NG, GB3SS
B
71.9
None in Scotland
C
77.0
GB3IG, GB3LU, GB3OC
D
82.5
None in Scotland
E
88.5
GB3HI
F
94.8
GB3AG, GB3DD, GB3ED, GB3OH, GB3PR, GB3PU
G
103.5
GB3AY, GB3CS, GB3DG, GB3DM, GB3KA, GB3GL, GB3LG, GB3PA
H
110.9
None in Scotland
J
118.8 GB3BT, GB3HK, GB3SB
Yellow = VHF (2m) Green = UHF (70cm)
DTMF Frequencies
Dual Tone Multi Frequency (DTMF) is a method of remotely
controlling a system by sending two un-related tones by
pressing the buttons on a phone or handheld transceiver's
keypad.
The table below shows that if you press the button 5 for
example, both 1336 Hz and 770 Hz tones will be sent simultaneously.
This system has been around for many years and can be used
for all sorts of things from dialling up an Internet connected
Amateur Radio Station to sending a remote close down request
your local repeater.
Freq. (Hz)
1209
1336
1477 1633
697
1
2
3
A
770
4
5
6
B
852
7
8
9
C
941
*
0
#
D
