Caerhendy transmitting station

51°36′23″N 3°46′23″W / 51.606292°N 3.773067°W / 51.606292; -3.773067Grid referenceSS772912Built1980sDemolished2010Relay ofWenvoeBBC regionBBC WalesITV regionITV Cymru Wales

The Caerhendy television relay station was sited at Caerhendy in the Afan Valley, a few kilometres north of Junction 40 on the M4 motorway at Port Talbot. It was originally built in the 1980s as a fill-in relay for UHF analogue television. It was sited at the clubhouse of the soccer ground at Ynys Park and consisted of a mere 3 m aluminium mast carrying a vertically stacked yagi array. The transmitter served about 50 houses in Caerhendy, about 500 m across the valley to the east, which for reasons of geography couldn't get a signal from Mynydd Emroch transmitter just to the south.

Alltwen transmitter re-radiated a signal received off-air from Cwmafan about 2 km farther to the northeast, itself a relay of Wenvoe. It was possibly the lowest ERP officially provided TV relay in the UK, radiating just 0.5 W on each of its four UHF channels.

When it came, the digital switchover process rendered Caerhendy redundant. It is no longer in service.

Frequency	UHF	kW	Service
471.25 MHz	21	0.0005	BBC One Wales
495.25 MHz	24	0.0005	ITV1 Wales
519.25 MHz	27	0.0005	BBC Two Wales
551.25 MHz	31	0.0005	S4C

• The Transmission Gallery: Caerhendy
• UKFree: Caerhendy TV transmitter