Clarkstown radio transmitter
The Clarkstown radio transmitter is a longwave radio transmitter in County Meath, Ireland. It is located some 3.5 km east of the village of Summerhill, in a field south of the R156 regional road at Clarkstown.
Constructed in 1988 for the transmission of Atlantic 252 on 252 kHz, it uses one 248-metre-high guyed steel framework mast with triangular cross section, insulated against ground. The original transmitters were two 300 kilowatt Continental Solid State transmitters built by Varian Associates of Dallas. These were replaced in 2007 by a single 300 kilowatt Transradio TRAM 300L transmitter. The ground around the mast and the entire transmission site bed are lined with copper for conductivity. The site has an ITU-cleared transmission power of 500 kW by day and 100 kW at night but is now only capable of operating at 300 kW by day.
Atlantic 252 ceased operations on 20 December 2001 and the transmitter was later taken over by RTÉ Network Limited (now 2RN). It is now used for the AM version of RTÉ Radio 1 on 252 kHz, and has been the sole source of RTÉ Radio 1 on AM since 24 March 2008, when the medium wave Tullamore transmitter on 567 kHz was taken off air.
In 2007, the transmitter was carrying a Digital Radio Mondiale multiplex overnight, featuring Radio 1, RTÉ Digital Radio Sport, RTÉ Digital Radio News and the World Radio Network, before reverting to AM transmission for the daytime. DRM tests have since ceased, and AM transmissions now operate full-time once again.
On September 24th 2014, RTÉ announced that broadcasting of RTÉ Radio 1 on 252 kHz will cease on October 27th 2014.  (That date is has now been postponed until Jan 2015)
- http://tx.mb21.co.uk/features/252/summerhill.shtml – pictures from mb21
- Summerhill Transmitter at Structurae
- IAA information on the mast here (page 20).
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