Bristol

DAB ensemble · block 11B · 8 transmitters

Ensemble identifier: C18C
Block: 11B
Frequency: 218.640 MHz
Licence: DL000014
Area: Bristol
Services: 6 radio, 1 data

On the map

Where Bristol is radiated from — 8 transmitters [V], Ofcom's published positions. This says nothing about how far the signal reaches; it is not a coverage map.

What it carries

Heart BristolSmooth BristolCapital UKBBC BristolHITS RADIO WestGrt Hits Bristol

Data services

EPG Bristol

Transmitters

8 transmitters, strongest first. TII is the transmitter identifier a receiver can report, which is how you tell which one you are actually hearing in a single-frequency network.
Transmitter	Nation	Block	Frequency	ERP	Height	Area	TII
Dundry East	England	11B	218.640 MHz	4.0 kW	40 m	Bristol	23/0D
Hutton	England	11B	218.640 MHz	2.0 kW	22 m	Weston-Super-Mare	23/0C
Milbury Heath	England	11B	218.640 MHz	1.2 kW	20 m	North Bristol	23/07
Pur Down	England	11B	218.640 MHz	1.0 kW	56 m	Bristol	23/0F
Bath	England	11B	218.640 MHz	977 W	40 m	Bath	23/0E
Siston	England	11B	218.640 MHz	600 W	26 m	Bristol	23/10
Backwell	England	11B	218.640 MHz	300 W	32 m	West of Bristol	23/03
Bristol Kings Weston	England	11B	218.640 MHz	300 W	40 m	Bristol	23/0B

Radiation pattern

Its strongest transmitter with a published pattern, Dundry East. Other transmitters of this ensemble may shape their signal differently.

Radiates most strongly toward the north-east (30°), as published by Ofcom.

More detail

Each ring is 10 dB of attenuation below the pattern's own peak; the outer rim is the peak itself and anything 30 dB down or deeper is drawn at the centre rather than off the edge of the chart, so a very deep null reads as “weak” and not as a hole in the picture. The shape says which direction radiates harder relative to the mast's own peak, not the absolute field strength there or how far it reaches — that is what the coverage map and the postcode lookup are for.