THE TRANSMISSION GALLERY
|Photos by TCPD, Andy Hayward and Jordy Lyons||Page last updated: 2013-02-05|
|The Londonderry site is on Sherriff's Mountain which overlooks the town of Derry/Londonderry. It provides this part of Ulster with radio and TV services on UHF, VHF and MF.|
Classic FM's transmissions on 100.5 are directional as the RTE relay at Malin Head is just 200 kHz away.
RTE's tv transmitter at Holywell Hill is less than 2 miles south of this site and many houses in Co. Derry and Co. Donegal have 2 UHF aerials receiving all 10 tv services available in the area.
Below: A photograph (provided by TCPD) taken before the VHF re-engineering to mixed polarisation.
TCPD writes: The top span carries an 8 tier HP antenna for VHF/FM (13kW erp)and a 4 tier HP antenna for Band I television (channel 2, 1.5kW).
Below the stays can be seen the "loop and dipole" mixed polarisation FM antenna used by the IBA as a cheap antenna for the first independent local radio stations. Not many of these have survived because they were fairly narrow band and not generally suitable for sharing.
The cantilever UHF antenna is a 16 wavelength cardioid inside a 3ft. diameter cylinder - the only time the BBC used this size for a cardioid, though the IBA used 3ft. cylinders at all their sites. I believe there were no changes for DSO and the cardioid is probably one of the oldest still in service
|Above: The MF aerial radiating BBC R Ulster, R Five Live and talkSPORT|
Below is a view looking to the west of the site showing another short tower, apparently with UHF panel aerials which probably radiate the local tv service Channel 9. Beyond that is the RTE tower Holywell Hill.
|RTE's Holywell Hill|
18-Dec-1957 BBC TV in service on VHF ch 2.
23-Oct-1961 BBC FM radio in service on 88.3 / 90.55 / 92.7.
January 1971 BBC-2 added on ch 44.
1-Dec-1975 BBC-1 & ITV added on ch's 51 & 41.
23-Nov-1978 BBC medium wave radio services moved to this site. Radio 1, 1053 kHz; Radio 2, 909 kHz; Radio 3, 1215 kHz; Radio 4, 720 kHz; Radio Ulster 1341 kHz. This replaced the Londonderry MF site at, or near to, Strand Road Police Station.
1981/2 Radio Ulster frequency changed to 792 kHz (Radio Foyle).
11-Mar-1983 FM Radio 2 and Radio Ulster converted to stereo.
25-Apr-1983 FM Radio 3 converted to stereo.
July 1984 Channel 4 added on ch 47.
July 1985 BBC FM radio frequencies changed to 88.7 / 90.9 / 93.1.
1-Oct-1986 ILR (Downtown Radio) added on 102.4 MHz.
April 1987 BBC FM radio re-engineered for mixed polarisation. ILR also transferred to this new Tx aerial.
6-Jan-1989 Radio 4 added on 94.9 MHz.
4-Jun-1990 Radio 1 added on 98.3 MHz.
27-Aug-1990 909 kHz re-assigned to Radio 5.
28-Feb-1990 Radio 3, 1215 kHz closed.
13-Aug-1993 Classic FM added on 100.5 MHz.
30-Jun-1994 Radio 1, 1053 kHz closed.
14-Feb-1995 Talk Radio launches on 1053 kHz. Closed February 2020.
30-Mar-1997 Channel 5 launches on ch 31.
17-Oct-1999 Local TV (C9TV) launches on ch 21. Closed 2009.
5-Sep-2001 N. Ireland DAB added
29-Jun-2005 BBC National DAB added
October 2012 Digital Switchover
26-Jul-2013 Digital One DAB added.
BBC RD: SIte tests in Londonderry (1956)
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