"The Type 1021-AU Standard-Signal Generator consists of a Type 1021-P2 R-F Unit and a Type 1021-P1 Power Supply, combined in a single aluminium cabinet. Its frequency range of 250 to 920 Mc is covered in a single band.

The Type 1021-AV Standard-Signal Generator uses the same power supply and cabinet as the Type 1021-AU, but uses the Type 1021-P3B R-F Unit, which covers the frequency range of 40 to 250 Mc in two bands: 40 to 50 Mc and 50 to 250 Mc. Hence the total range of the Type 1021-A Standard-Signal Generator, with the two interchangeable r-f units, is from 40 to 920 Mc. If only one cabinet and power supply are available with the two r-f sections, one r-f section can be substituted for the other easily. The only connection between the power supply and r-f section is a multiconductor cable and plug attached permanently to the power suppply" (General Radio, Manual 1021-AU, 1957)

BRIEF SPECS

The housing of this G-R signal generator is still under restauration. The circuit is divided in a power supply / modulator chassis and the rf oscillator section. There was the choice of two interchangeable rf-plugins wich cover the 40 MHz...250 MHz (1921-P3B) and the 250 MHz ... 950 MHz (1021-P2) bands.