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Re: Transmitter Reciever TR9D
Overseas is another matter, because it also relies upon the transmitting network being equipped to the same standard. All this takes time. Spitfire Mk.Vs were built with UK aircraft having the TR1133, but the TR9D was part of the tropicalisation mods. This certainly requires TR1133 as the UK standard by the time of the Mk.V - or at least the tropicalised versions, but I don't have a list of the Amendments to see what was initial equipment for the standard aircraft.
I don't see any particular reason to doubt that the re-equipment with TR1133 could have started in August 1940, or even earlier, but that's not the same thing as complete re-equipment of even Fighter Command.
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