R.A.F. Henlow Signals Museum Exhibits for disposal

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Missile part of Tomahawk	Model Rescue Launch	Monitor Crystal Type 4A (Tropical)	Monitor Performance	Morse Creed Keyboard Perforator 9

Monitor crystal type 4A.

This unit was used to provide a test signal on one of five preset frequencies for setting the tuneable R1132A receivers to
the required frequency. The frequency was controlled by quartz crystals and the crystal frequency was electronically
multiplied by 18 to get the output frequency in the air band between 100Mc/s and 130Mc/s.

Sec/Ref: 10T/573

Monitor Crystal Type 4A (Tropical) (Photograph Number 0390)

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