Chesham

England · TV and DAB

Position: 51.697905, -0.618141
Grid reference: SP95600081
Nation: England
Ground height: 127 m
Antenna height: 48 m
Aerial group: Group B — C35–53, the middle
Polarisation: Vertical
BBC region: London
ITV region: London
ITV news region: London
Parent transmitter: Crystal Palace
Ofcom site number: 10112

The position is our conversion of Ofcom's grid reference SP95600081 from OSGB36 to WGS84 [V]. Ofcom publish no latitude and longitude for television sites. The transform is verified rather than assumed: on the 3,403 radio records that carry both, it reproduces Ofcom's own coordinates to within 0.1 m.

How far it reaches

The share of the UK's 238,895 Census Output Areas where this mast is the strongest signal of its kind. Not the share it reaches at all — most places can receive several transmitters, and only one of them can be the best.

Band	Best signal in
Television	0.02% of UK Output Areas	a relay, serving a local area
DAB radio	0.03% of UK Output Areas	a relay, serving a local area

On the map

Where Chesham is the strongest signal for television and DAB radio.

Television

Multiplexes transmitted from this site, as published by Ofcom.
Mux	Freeview name	Channel	Frequency	ERP	System	Operator
PSB1	BBC A	C43	650 MHz	20 W	DVB-T	BBC
PSB2	D3&4	C40	626 MHz	20 W	DVB-T	Digital 3&4 (ITV/Channel 4)
PSB3	BBC B	C46	674 MHz	20 W	DVB-T2	BBC

DAB radio

DAB ensembles carried here.
Ensemble	Block	Frequency	ERP	Height	Area	EId	Services
D1 National	11D	222.064 MHz	100 W	52 m	Chesham	C181	30
BBC National DAB	12B	225.648 MHz	100 W	52 m	Chesham	CE15	16

D1 National — block 11D

BBC National DAB — block 12B

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