Editing Mendip transmitting station (section)

==Output==

===Radio===

====Analogue====
{| class="wikitable sortable"
!Frequency
!kW<ref name="auto">Radio Listeners Guide 2010</ref>
!Service
!Notes
|-
|95.5&nbsp;[[MHz]]
|5
|[[BBC Radio Somerset]]
|
|-
|101.0&nbsp;MHz
|40
|[[Hits Radio]]
|Directional antenna towards South Wales<ref>{{Cite web |title=Photo of effective power map |url=https://fmscan.org/power.png.php?i=2801161}}</ref>
|-
|102.6&nbsp;MHz
|4
|[[Heart West]]
|
|}

====Digital====
{| class="wikitable sortable"
!Frequency
!Block
!kW<ref name="auto"/>
!Operator
!Notes
|-
|211.648&nbsp;MHz
|10B
|1.2
|[[MuxCo Somerset]]
|
|-
|216.928&nbsp;MHz
|11A
|
|[[Sound_Digital|Sound Digital Limited]]
|
|-
|222.064&nbsp;MHz
|11D
|5
|[[Digital One]]
|
|-
|225.648&nbsp;MHz
|12B
|5
|[[BBC National DAB]]
|
|-
|227.360 MHz
|12C
|1.5<ref name="auto1"/>
|South East Wales
|For improved coverage on the Welsh coastline<ref>{{Cite web |title=mb21 - The Transmission Gallery |url=https://tx.mb21.co.uk/gallery/gallerypage.php?txid=620&pageid=2372 |access-date=2023-04-17 |website=tx.mb21.co.uk}}</ref>
|}

===Television===

====Analogue====

=====1 December 1969 – 11 May 1970=====
{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Service
|-
|{{UK System I|ch=64}}
|64
|500
|[[BBC Two|BBC2 West]]
|}

=====11 May 1970 – 30 May 1970=====
{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Service
|-
|{{UK System I|ch=58}}
|58
|500
|[[BBC One|BBC1 West]]
|-
|{{UK System I|ch=64}}
|64
|500
|[[BBC Two|BBC2 West]]
|}

=====30 May 1970 – 2 November 1982=====
{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Service
|-
|{{UK System I|ch=58}}
|58
|500
|[[BBC One|BBC1 West]]
|-
|{{UK System I|ch=61}}
|61
|500
|[[ITV Wales & West|HTV West]]
|-
|{{UK System I|ch=64}}
|64
|500
|[[BBC Two|BBC2 West]]
|}

=====2 November 1982 – 30 March 1997=====
{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Service
|-
|{{UK System I|ch=54}}
|54
|500
|[[Channel 4]]
|-
|{{UK System I|ch=58}}
|58
|500
|[[BBC One|BBC1 West]]
|-
|{{UK System I|ch=61}}
|61
|500
|[[ITV Wales & West|HTV West]]
|-
|{{UK System I|ch=64}}
|64
|500
|[[BBC Two|BBC2 West]]
|}

=====30 March 1997 – 15 November 1998=====
{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Service
|-
|{{UK System I|ch=37}}
|37
|126
|[[Channel 5 (British TV channel)|Channel 5]]
|-
|{{UK System I|ch=54}}
|54
|500
|[[Channel 4]]
|-
|{{UK System I|ch=58}}
|58
|500
|[[BBC One|BBC1 West]]
|-
|{{UK System I|ch=61}}
|61
|500
|[[ITV Wales & West|HTV West]]
|-
|{{UK System I|ch=64}}
|64
|500
|[[BBC Two|BBC2 West]]
|}

====Analogue and digital====

=====15 November 1998 – 24 March 2010=====
Digital terrestrial television was first transmitted from the Mendip mast from 15 November 1998 using the frequency gaps between the analogue TV broadcasts. To limit interference to the analogue transmissions, power output on the digital multiplexes was low.

{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Operator
!{{no2}}System
|-
|{{UK System I|ch=37}}
|37
|126
|[[Channel 5 (British TV channel)|Channel 5]]
|[[PAL]] System I
|-
|{{UK System I|ch=54}}
|54
|500
|[[Channel 4]]
|PAL System I
|-
|{{UK DVB-T|ch=55|off=pos}}
|55+
|10
|[[Digital 3&4]] (Mux 2)
|[[DVB-T]]
|-
|{{UK DVB-T|ch=56|off=pos}}
|56+
|10
|[[Arqiva]] (Mux C)
|DVB-T
|-
|{{UK System I|ch=58}}
|58
|500
|[[BBC One|BBC1 West]]
|PAL System I
|-
|{{UK DVB-T|ch=59|off=pos}}
|59+
|10
|[[BBC]] (Mux 1)
|DVB-T
|-
|{{UK System I|ch=61}}
|61
|500
|HTV West
|PAL System I
|-
|{{UK DVB-T|ch=62|off=pos}}
|62+
|10
|[[S4C Digital Networks|SDN]] (Mux A)
|DVB-T
|-
|{{UK System I|ch=64}}
|64
|500
|[[BBC Two|BBC2 West]]
|PAL System I
|-
|{{UK DVB-T|ch=65|off=pos}}
|65+
|10
|BBC (Mux B)
|DVB-T
|-
|{{UK DVB-T|ch=67}}
|67
|10
|Arqiva (Mux D)
|DVB-T
|}

=====24 March 2010 – 7 April 2010=====
On 24 March 2010 BBC2 was switched off on UHF 64 and HTV West was switched from UHF 61 for its final weeks of service. Multiplex 1 on UHF 59+ was closed and replaced by BBC A on UHF 61 (which had just been vacated by analogue HTV West). BBC A was transmitted at full power (100&nbsp;kW) and in 64QAM, 8k carriers mode from the start.

{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Operator
!{{no2}}System
|-
|{{UK System I|ch=37}}
|37
|126
|[[Channel 5 (British TV channel)|Channel 5]]
|[[PAL]] System I
|-
|{{UK System I|ch=54}}
|54
|500
|[[Channel 4]]
|PAL System I
|-
|{{UK DVB-T|ch=55|off=pos}}
|55+
|10
|[[Digital 3&4]] (Mux 2)
|[[DVB-T]]
|-
|{{UK DVB-T|ch=56|off=pos}}
|56+
|10
|[[Arqiva]] (Mux C)
|DVB-T
|-
|{{UK System I|ch=58}}
|58
|500
|[[BBC One|BBC1 West]]
|PAL System I
|-
|{{UK DVB-T|ch=61}}
|61
|100
|[[BBC]] A
|DVB-T
|-
|{{UK DVB-T|ch=62|off=pos}}
|62+
|10
|[[S4C Digital Networks|SDN]] (Mux A)
|DVB-T
|-
|{{UK System I|ch=64}}
|64
|500
|[[ITV Wales & West|HTV West]]
|PAL System I
|-
|{{UK DVB-T|ch=65|off=pos}}
|65+
|10
|BBC (Mux B)
|DVB-T
|-
|{{UK DVB-T|ch=67}}
|67
|10
|Arqiva (Mux D)
|DVB-T
|}

====Digital====

=====7 April 2010 – 28 September 2011=====
Following the completion of analogue TV shutdown on 7 April 2010, Mendip transmitted all of its higher powered multiplexes at 100&nbsp;kW. From this date until the second-stage switchover of 28 September 2011 the frequency allocation was:

{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Operator
!{{no2}}System
|-
|{{UK DVB-T|ch=54}}
|54
|100
|[[Digital 3&4]]
|[[DVB-T]]
|-
|{{UK DVB-T|ch=56|off=pos}}
|56+
|10
|[[Arqiva]] A
|DVB-T
|-
|{{UK DVB-T|ch=58}}
|58
|100
|[[BBC]] B
|[[DVB-T2]]
|-
|{{UK DVB-T|ch=61}}
|61
|100
|BBC A
|DVB-T
|-
|{{UK DVB-T|ch=62|off=pos}}
|62+
|10
|[[S4C Digital Networks|SDN]]
|DVB-T
|-
|{{UK DVB-T|ch=67}}
|67
|26
|Arqiva B
|DVB-T
|}

=====28 September 2011 – 28 March 2012=====
With the completion of digital switchover at Oxford, all multiplexes could be moved to their final channel allocations with the exception of Arqiva A. SDN increased to half its full power output (50&nbsp;kW).

{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Operator
!{{no2}}System
|-
|{{UK DVB-T|ch=48}}
|48
|50
|[[S4C Digital Networks|SDN]]
|[[DVB-T]]
|-
|{{UK DVB-T|ch=52}}
|52
|25.7
|[[Arqiva]] B
|DVB-T
|-
|{{UK DVB-T|ch=54}}
|54
|100
|[[Digital 3&4]]
|DVB-T
|-
|{{UK DVB-T|ch=58}}
|58
|100
|[[BBC]] B
|[[DVB-T2]]
|-
|{{UK DVB-T|ch=61}}
|61
|100
|BBC A
|DVB-T
|-
|{{UK DVB-T|ch=67}}
|67
|26
|Arqiva A
|DVB-T
|}

=====28 March 2012 – 26 March 2013=====
On 28 March 2012 Arqiva A moved to its final channel allocation at UHF 56, after the completion of digital switchover at Salisbury. Arqiva A and B and SDN also increased to full power (100&nbsp;kW) on this date.<ref>{{Cite web|url=http://www.digitaluk.co.uk/transmitternetwork/tools__and__resources/almanac/special_editions/Special_edition-installers_Mendip_retune_event_March2012_Final_rev23March.pdf|title = Corporate| date=7 February 2023 }}</ref>

{| class="wikitable sortable"
!Frequency
!UHF
!kW
!Operator
!System
|-
|{{UK DVB-T|ch=48}}
|48
|100
|[[S4C Digital Networks|SDN]]
|[[DVB-T]]
|-
|{{UK DVB-T|ch=52}}
|52
|100
|[[Arqiva]] B
|DVB-T
|-
|{{UK DVB-T|ch=54}}
|54
|100
|[[Digital 3&4]]
|DVB-T
|-
|{{UK DVB-T|ch=56}}
|56
|100
|Arqiva A
|DVB-T
|-
|{{UK DVB-T|ch=58}}
|58
|100
|[[BBC]] B
|[[DVB-T2]]
|-
|{{UK DVB-T|ch=61}}
|61
|100
|BBC A
|DVB-T
|}

=====27 March 2013 – 27 February 2018=====
BBC A moved from UHF 61 to UHF 49 to allow for the clearance of the 800&nbsp;MHz band for 4G LTE mobile services.<ref>{{cite web | url=https://ukfree.tv/article/1107051940/2013_postswitchover_changes_to_Freeview_transmissi | title=2013 - post-switchover changes to Freeview transmission frequencies | publisher=ukfree.tv | date=13 January 2012 | first=Brian | last=Butterworth | access-date=22 July 2019 }}</ref><ref>{{Cite web|url=http://www.digitaluk.co.uk/when_do_i_switch/west|title=Corporate|date=7 February 2023 }}</ref>

{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Operator
!{{no2}}System
|-
|{{UK DVB-T|ch=48}}
|48
|100
|[[S4C Digital Networks|SDN]]
|[[DVB-T]]
|-
|-
|{{UK DVB-T|ch=49}}
|49
|100
|BBC A
|DVB-T
|-
|{{UK DVB-T|ch=52}}
|52
|100
|[[Arqiva]] B
|DVB-T
|-
|{{UK DVB-T|ch=54}}
|54
|100
|[[Digital 3&4]]
|DVB-T
|-
|{{UK DVB-T|ch=56}}
|56
|100
|Arqiva A
|DVB-T
|-
|{{UK DVB-T|ch=58}}
|58
|100
|[[BBC]] B
|[[DVB-T2]]
|}

===== 27 February 2018 -  4 April 2019 =====
Arqiva A has moved from UHF 56 to UHF 33 for the start of the 700MHz clearance programme at Mendip. 

{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Operator
!{{no2}}System
|-
|{{UK DVB-T|ch=33}}
|33
|100
|Arqiva A
|[[DVB-T]]
|-
|{{UK DVB-T|ch=48}}
|48
|100
|[[S4C Digital Networks|SDN]]
|DVB-T
|-
|{{UK DVB-T|ch=49}}
|49
|100
|BBC A
|DVB-T
|-
|{{UK DVB-T|ch=52}}
|52
|100
|[[Arqiva]] B
|DVB-T
|-
|{{UK DVB-T|ch=54}}
|54
|100
|[[Digital 3&4]]
|DVB-T
|-
|{{UK DVB-T|ch=58}}
|58
|100
|[[BBC]] B
|[[DVB-T2]]
|}

===== 4 April 2019 – 5 June 2019 =====
BBC A has moved from UHF 49 to UHF 32 as part of the 700MHz clearance programme at Mendip. 

{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Operator
!{{no2}}System
|-
|{{UK DVB-T|ch=32}}
|32
|100
|BBC A
|[[DVB-T]]
|-
|{{UK DVB-T|ch=33}}
|33
|100
|Arqiva A
|DVB-T
|-
|{{UK DVB-T|ch=48}}
|48
|100
|[[S4C Digital Networks|SDN]]
|DVB-T
|-
|{{UK DVB-T|ch=52}}
|52
|100
|[[Arqiva]] B
|DVB-T
|-
|{{UK DVB-T|ch=54}}
|54
|100
|[[Digital 3&4]]
|DVB-T
|-
|{{UK DVB-T|ch=58}}
|58
|100
|[[BBC]] B
|[[DVB-T2]]
|}

===== 5 June 2019 - Present =====
Digital 3&4 has moved from UHF 54 to UHF 34, and BBC B have moved as well from UHF 58 to UHF 35 as part of the 700MHz clearance programme at Mendip. Many Welsh residents also prefer Mendip's service to the Wenvoe service as it provides a stronger signal to the coastline and areas in the shadow of the Wenvoe mast. 

{| class="wikitable sortable"
!{{no2}}Frequency
!{{no2}}UHF
!{{no2}}kW
!{{no2}}Operator
!{{no2}}System
|-
|{{UK DVB-T|ch=32}}
|32
|100
|BBC A
|[[DVB-T]]
|-
|{{UK DVB-T|ch=33}}
|33
|100
|Arqiva A
|DVB-T
|-
|{{UK DVB-T|ch=34}}
|34
|100
|[[Digital 3&4]]
|DVB-T
|-
|{{UK DVB-T|ch=35}}
|35
|100
|[[BBC]] B
|[[DVB-T2]]
|-
|{{UK DVB-T|ch=36}}
|36
|100
|[[Arqiva]] B
|DVB-T
|-
|{{UK DVB-T|ch=48}}
|48
|100
|[[S4C Digital Networks|SDN]]
|DVB-T
|}