[Test-Equipment] SG-823/URM-144

[RICHARD GEORGE]

I have just purchased a piece of surplus test equipment. It is an SG-823/urm-144 signal generator. It is in very nice condition and seems to have some output. It contains 2 audio oscillators that can be mixed. It does not have RF output unless these are turned on. It is fixed frequency covering most ham bands. What is this thing and what was it used for? Manuals, schematics?

Thanks K6KWQ