R.A.F. Henlow Signals Museum Exhibits

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Transmitter Type T1509	Transmitter Type T1540	Transmitter Type T21C	Transmitter Type T21C	Transmitter Type T5017

Transmitter Type 21C.

This transmitter (and its receiver Type TF) was introduced into service in 1918 for use in aircraft to provide two-way communications.
In some respect these were not very practical as they worked on Medium and Long wave and required a long aerial.
They were in use throughout the 1920s and even had uses in WWII, mostly as pack sets.

Transmitter Type T21C (Photograph Number 0054)

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