Racal RA1792 Continuously tunable synthesizer in 10 Hz steps over frequency range. Frequency setting either by numerical keypad or by single tuning knob with continuously variable tuning rate from 1 Khz per turn to approximately 20 Khz per turn, depending on the speed of rotation. Memory unit programmed with up to 100 frequencies and recalled by keypad or tuning control. Automatic ChannelScanning of up to ten channels in any decade of the 100 stored channels. Emergency memory delete of freqs. using quadrant keys.

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