“Hannington transmitting station”的意思、由来-开放百科全书

词条

Hannington transmitting station

释义

Broadcast interruption
Services available
Analogue radio Digital radio Digital television Before switchover Analogue television
External links
References

{{Infobox UK transmitter
|name = Hannington
|image =
|caption = Transmission Mast, Cottington Hill
|map_name = Hampshire
|coordinates = {{coord|51.3080|-1.2447|type:landmark_region:GB|display=inline,title}}
|location =
|height = {{convert|151.9|m|ft|0}}
|gridref =
|built = 1970
|demolished =
|collapsed =
|relay =
|BBC = BBC South
|ITV = ITV Meridian
|localtv = That's Thames Valley
}}

Hannington transmitting station is a television and radio transmitting station located on Cottington Hill near the village of Hannington. The transmitter is actually in the parish of Kingsclere. The station provides broadcast services to Berkshire and north Hampshire, and includes a {{convert|131.4|m|ft|0}} guyed steel lattice mast. Surmounting the mast is a GRP aerial cylinder, which contains the UHF television transmitting antennas, which brings the overall height of the mast to {{convert|151.9|m|ft|0}}.

Hannington's digital broadcasts were severely attenuated to the East before DSO (Digital Switch-Over) so as not to cause co-channel interference with Guildford transmitter. Those restrictions were removed soon after DSO in 2012. see picture.

Broadcast interruption

On Saturday 26 November 1977 at around 5.10 pm, the Southern ITV broadcast from this transmitter had its UHF sound transmission hi-jacked by unknown agents. At that time Hannington re-broadcast off-air UHF transmissions from Rowridge on the Isle of Wight. The UHF audio signal from Rowridge was swamped by a signal presumably from a location much closer to the Hannington transmitter, overriding the sound of the local ITV station Southern Television and broadcast their own audio message purporting to be from Vrillon, an alien from an institution calling itself the Ashtar Galactic Command. The message, transmitted over an ITN News bulletin and a subsequent Merrie Melodies cartoon, lasted six minutes.

Despite extensive investigations by Hampshire Police, the Independent Broadcasting Authority and Southern Television, those responsible have never been identified, and the potential culprits have ranged from students to university professors to disgruntled television technicians.

Services available

Analogue radio

Frequency	kW^[1]	Service
102.9 MHz	4	Heart Thames Valley
104.1 MHz	3	BBC Radio Berkshire

Digital radio

Frequency	Block	kW	Operator
222.064 MHz	11D	4.8	Digital One
225.648 MHz	12B	5	BBC National DAB
229.072 MHz	12D	1	NOW Berkshire & North Hampshire

Digital television

Frequency	UHF	kW	Operator	System
ch=39}}	39	50	BBC B	DVB-T2
ch=40}}	40	25	SDN	DVB-T
ch=42}}	42	50	Digital 3&4	DVB-T
ch=43}}	43	25	Arqiva A	DVB-T
ch=45}}	45	50	BBC A	DVB-T
ch=46}}	46	25	Arqiva B	DVB-T

Before switchover

{{no2Frequency	{{no2UHF	{{no2kW	{{no2Operator
ch=40\|off=pos}}	40+	20	SDN (Mux A)
ch=41\|off=pos}}	41+	10	Arqiva (Mux D)
ch=43\|off=pos}}	43+	20	Digital 3&4 (Mux 2)
ch=44\|off=pos}}	44+	10	Arqiva (Mux C)
ch=46\|off=pos}}	46+	20	BBC (Mux B)
ch=50}}	50	20	BBC (Mux 1)

Analogue television

Analogue television transmissions ceased from Hannington during February 2012; BBC Two analogue closed on UHF 45 on 8 February 2012 and all other analogue services closed on 22 February 2012.

{{no2Frequency	{{no2UHF	{{no2kW	{{no2Service
ch=35}}	35	60	Channel 5
ch=39}}	39	250	BBC One
ch=42}}	42	250	ITV1
ch=45}}	45	250	BBC Two
ch=66}}	66	250	Channel 4

Aerial group: E
Polarisation: horizontal

External links

Hannington Transmitter at thebigtower.com

References

1. ^Radio Listeners Guide 2010

1 : Transmitter sites in England

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