Microwave Sweep Generator 694A

The Hewlett Packard 694A sweep generator has a range from 8 to 12.4 GHz and feature three modes of sweep operation. In the first "Normal" mode, the output frequency is swept in either directions between two continuously adjustable limits. In the "F" mode, frequency is swept about an adjustable center frequency. As a third mode these same frequency markers may be used to establish a sweep mode similar to "normal" called "marker sweep" in wich the markers determine the sweep range.

This instrument uses 37 Transistors, 17 Tubes, 105 Diodes and 4 Voltage Regulators. Transistors, Tubes and Voltage regulators listed one per type. The list includes 18 Transistors unknown, listed without names, 3 Tubes unknown CK647 and all Diodes unknown to RMORG: 1 1N277, 59 1N458 and 44 not named.

All characteristics and the construction are the same of 691A, 692A and 693A, except the range, that for 691 is 1 to 2 GHz, 692 is 2 to 4 GHz and 693 is 4 to 8 GHz. 

A complete and detailed description of these devices in: "Models 691A, 692A, 693A, 694A Sweep Oscillators, Operating and Service Manual 02280-1", 1965, 161 pages, from Internet, courtesy of Mr. Jerry Elarton (RMORG).

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