The signal generator is designed for testing of radio communications equipment. Supplied in large numbers to the military, and built with no consideration to cost!
It has single knob tuning which uses a precision PLL system to generate the output frequencies which are locked to highly accurate frequency standard.
A really handy feature of this instrument is a “channelised” control allowing easy, one-touch selection of the next higher or lower required frequency, with channels steps of 5, 10, 20, 6.25, 12.5, 25, 50, 15, 30, 60 kHz.
In common with most signal generators, the unit allows modulation of the RF output. A handy 1KHz audio output socket is also provided on the rear of the instrument.