TN21 Transmitter
Frequency range: Short wave, From 20 to 100 metres.
Modes: CW or ICW (MCW)
Power output:   250 watts on CW;  less on ICW
Frequency control: Assumed to be crystal.

If anyone can provide any further information, please contact:

Looking for a photo of the TN21.

Credits and Contributors:

1) Marconi Archive, Bodleian Library, Oxford

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Mar 3/18