Note, due to the new phenomenon of MUXICAL chairs you may experience problems with certain MUXES disappearing. First try rescanning your TV / set top box, do it manually if possible. If this fails to sort it check on transmitter work or call the reception advice phone numbers.
Also see basic digital fault finding.
700MHz clearance occurred at Craigkelly in Oct 2018 when it reverted to its original A group (excluding the "temporary" MUXES 7 & 8), though most K group or wideband aerials will continue to work OK. Even more positively, those in poor signal areas will find swapping to an A group aerial will pay dividends, see Craigkelly graph.
Craigkelly transmitter was built in 1971, or rather more accurately it was rebuilt on its present site. The tower was originally in use at Emley Moor in 1956 by the IBA, as the first of the three transmitters to have been in existence there. The tower is situated about 8 miles North of Edinburgh, overlooking the Firth of Forth and the most famous bridge in the world. Its population coverage is about 1 million and it uses nine smaller repeater transmitters to improve its coverage in fringe areas.
The site altitude is 182m and the structure height is 125m with the transmitting arrays possibly another 10m or so above that, see How High Is High ?
Being a "main transmitter" it is horizontally polarised. Craigkelly was originally an A group it then became a K group (or wideband) at digital switchover, but it’s now reverted to an A group (excl MUXES 7 and 8 which are due to be switched off between 2020 and 2022 anyway).
The transmission power for MUXES 1 to 3 is 20kW, and for MUXES 4 to 6 it’s 10kW (before the 2011 digital switchover it was only 4kW and 2kW respectively).
There is one "Local" channel allocated to Craigkelly, CH32, which is used mainly for a local Edinburgh TV station.
Because of wideband antennas poor response at the bottom of the band, anyone who really requires a "high gain" aerial on a A group transmitter, e.g. Craigkelly, should actually fit a A group ! See Craigkelly’s Graph
(Not that many people actually need a high gain aerial anyway........)
For Craigkelly the DM log for strong signal areas, the Log36 or Yagi 18K for medium signal areas, the Yagi18A* for outside installs in poor signal areas, the XB10A* for loft installations in poor signal areas, and the XB16A* for those with the most marginal signals. Unless you have a massive loft we’d normally recommend the XB10A over the XB16A for a loft install due the smaller size of the former aerial. The dimensions and test performance of the aerials can be found on the relevant buy pages.
* The A group aerials will not pick up the "temporary" MUXES 7 & 8, if you particularly want to receive those MUXES we still recommend the DM log for strong signal areas and the Log36 or Yagi18K for medium signal areas, but for weak areas we’d recommend the DY14WB, though you will lose gain on the 6 main MUXES compared to an A group aerial. Alternatively, diplex a Yagi 18E with your existing A group aerial (using a CH38 diplexer) to get high gain across the whole band.
Craigkelly TV transmitter (Photo : David Foord at The Big Tower)
Craigkelly TV transmitter from the Royal Yacht Britannia. (Picture Mike Smith)
Craigkelly transmitter : graph of its transmissions against the gain curves of the aerials we recommend for it
The dotted lines are the "temporary" MUXES 7 & 8.
Note how after the 700MHz clearance in Oct 18 only MUXES 7 & 8 (both due to be turned off between 2020 and 2022) are out of the A group, so those in poor signal areas could swap to an A group and get significantly more signal.
Craigkelly transmitter’s channel guide.
The frequencies given are for (most) digital MUXES, for analogue channels deduct 3MHz.
This table also includes the same information for some of the other transmitters receivable in the area, namely Angus, Black Hill, Darvel, Penicuik, Selkirk and Chatton. This data can be of great use in determining possible causes of co-channel interference and / or alternative transmitters to try if Craigkelly fails to give an adequate signal, see the importance of "Line Of Sight". Note how the transmissions "dovetail" together in an attempt to minimise co-channel interference. The Channel Allocation Guides can also be very useful in the diagnosis of co-channel interference problems and can also be invaluable if you are trying to find a spare channel for a modulated output (e.g. for a Sky box or CCTV system) to be added to your TV setup/distribution system without suffering from co-channel.