History
Tor Sliag may correspond to the site mentioned in BBC Research paper 1963/57: "The television and VHF sound transmissions from Meldrum [Core Hill] are received at Fochabers and fed by GPO microwave link to Rosemarkie". BT Archives has references to images (not currently available) of twin 70 ft towers at Tor Sliasg in 1966 but a 1964 photo shows a horn antenna already installed. This is assumed to have served BBC and ITA (Grampian Television) requirements, replacing the interim arrangements. Specification W 6888 (1968) relates to the new link required in 1970 for BBC2 colour service from Rosemarkie and confirms Tor Sliasg was an intermediate site for the link providing television programme feeds to Rosemarkie.
The site is located within forest and the relatively short towers appear to have been designed for two horns each - as at Arncliffe Wood it seems the height of structures was kept as low as possible and more than one structure was therefore required. The orientation of the towers was optimised for the "line of shoot" to the adjacent sites. Only three towers of this style seem to have been made, the third is at Rosemarkie.
Tor Sliasg appears to have started off independent from the nearby Braewynner site with its early telephony link to Thrumster, however subsequent re-organisation during the 1970s led to a general-purpose route being provided via Tor Sliasg and Portmahomack with the Braewynner link eventually closed in the late 1970s. It seems the television route serving Rosemarkie continued as a direct link from Tor Sliasg.
Due to the location there are few recent photos of Tor Sliasg however it appears the towers were retained and the horns replaced with dishes.
