Correction: HF/DF wasn't a navigation aid.The two concentric circles are marked:
91 D.F - HOMER
112 HF/DF STATION
What do they mean. I guess HF is high frequency but don’t get the rest. And why are they marked at 109 and 209 yards?
DF(Direction Finding) was an aid to navigation in that it could be used to home an aircraft to overhead an airfield. Once the aircraft was confirmed overhead on the CR tube it was a simple process of using a clock and compass headings to allow the aircraft to descend into a safe area to let down through clouds to enable it to land in poor weather.Correction: HF/DF wasn't a navigation aid.
HF/DF was used for tracking friendly fighters in order to facilitate ground-controlled interception. Bradwell Bay would have been one of three stations in the sector with HF/DF receivers, and collectively they allowed Sector Control to triangulate the location of own forces and vector them onto the enemy.
As to the distances? Couldn't tell you. I'm not sure anyone was seriously worried about RF hazards back then.
The full story, did he survive, did he make it home?HF/DF was a crucial element of the Fighter Command C2 network. Each squadron's aircraft radios transmitted automatically at a pre-set but different number of minutes from the top of the hour. The HF/DF network could therefore triangulate on them and track the blue force precisely even where radar coverage wasn't available (in the BoB, almost everywhere over land). Sector controllers got information on the enemy from a mixture of radar and observer reports, on friendly aircraft from HF/DF, their job was to bring the two together at a tactically sensible moment.
HF/DF was a technology challenge - DF was well understood but doing it on high frequency radio, quickly, was new. The RN took the system to sea and found they could sometimes track in on U-boat position reports, although these were fleeting burst transmissions. This was especially useful when the Enigma was proving difficult to crack - you don't need to read the message to benefit from knowing where a U-boat is.
This went badly wrong for my granddad the communist sailor, whose ship (possibly him - he was a telegraphist) got a HF/DF fix on a U-boat, raced off to attack, and got torpedoed.
I'll have a look at the earlier pages and pass it on. The bombsite project is interesting, but as you say, limited to the London Blitz and I feel a bit limited detail-wise as most incidents when clicked just show very basic info.Your friend might want to have a butchers round about pages 9/10ish in this thread.
And maybe check out bombsight.org for scalable interactive maps of bomb distribution.
The site is limited to the London Blitz though.
From google: Tarrant is a topographical name for someone or thing by the side of the river Tarrant in Dorset.And coincidentally a friend who is on hols in Devon sent me this picture (although I don’t think she took it) and asked “WTF is this. Tarrant is north, east and west. How does that work FFS” (foul-mouthed Northern trollop).
View attachment 345048
Well I couldn’t find a Tarrant in the U.K. but moseying around Wimborne Minster on Google Maps I realised that the signs actually point to Tarrant Keynston, Tarrant Rushton etc.
There are loads of places in that part of Devon called Tarrant Something.
Which will probably not be news to any Scaleys.