6470 Kc/s R/T Lerwick/Graven/Unst for Plotting (including contact with patrols and to Naval Walrus aircraft stationed at Baltasound in emergency.
3085 Kc/s W/T - Graven/Unst for Admin or code traffic (Graven was where the Admin & Domestic Sites for RAF Sullom Voe were located)
The Keen of Hamar in 1940: Unst’s First Radar Station by David Waters
Scatsa Airfield (Revisited), Shetland by Terry Mayes
AVIA 7/439 - RDF Chain Operational Reports
AVIA 7 - 709 GM E69 stamped AMRE 2 July 1940 - Report on Unst station No 3 TRU
The Unst Heritage Centre