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R.A.F. Henlow Signals Museum Exhibits

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Transmitter_Type_T21C=0055.jpg Transmitter_Type_T5017=0039.jpg

Transmitter_Type_T77_(front)=0381.jpg Transmitter_Type_T77_(rear)=0382.jpg
Transmitter
Type T21C		Transmitter
Type T5017		Transmitter
Type T77		Transmitter
Type T77 (front)		Transmitter
Type T77 (rear)

Transmitter Type T77

The Type 77 transmitter, introduced in 1936, was used in combination with the R1084 receiver for
ground-to-point communication using W/T and R/T transmissions, both by Commands and the by Air Ministry.

The Transmitter used 4 Triode valves, as: Master Oscillator (MO) and Power Amplifier (PA), and Sub-Modulator and Modulator (for speech).

When the Transmitter was used for W/T (Morse), the Master Oscillator was operated continuously, to
maintain frequency stability, with only the PA valve being keyed.
Transmitter<br>Type T77

Transmitter Type T77 (Photograph Number 0212)

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