1. An amateur radio repeater is an electronic device that receives a weak or low-level amateur radio signal and retransmits it at a higher level or higher power, so that the signal can cover longer distances without degradation. Many repeaters are located on hilltops or on tall buildings as the higher location increases their coverage area, sometimes referred to as the radio horizon, or "footprint.“ From Wikipedia

2. Voice repeater bands include 10m (29mhz), 2m (145 mhz ) and 70cm (430cms) Repeaters increase the distance of any transmitted signal -acts as a booster. Some repeaters are linked to the internet

4. Same colours show how frequencies are re-used

5. Repeaters have a frequency difference between Input and output so they can transmit at the same time as receiving. For example: 2m Repeaters transmit 600kHz above their input frequency 2m repeaters either need a 1750 tone or a CTCSS tone to gain access (CTCSS tones may apply to other repeaters) Repeaters will periodically identify themselves via the use of morse. Full details of the UK repeaters can be found on the RSGB web site.

6. To access a repeaters your transmitter will require to be able to transmit on a different frequency to the receiving. In the case of 2m (145.xxxmhz) it would need to have a 600KHZ split. On 10M (29.XXX it would need a 100KHz split). I have always found it best to give both the station you are working and your call sign as often as is practicable. Remember some repeaters have timeouts so don’t make the overs (transmissions) too long. If /mobile remember if you go up a hill your signal will travel much further than normal.

7. Tones need to be checked on the RSGB web site