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).

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).

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.

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.