Band Change Switch of Models TBO and TBO-1 Portable Radio Equipment: General Electric Company - New Construction
Abstract
In accordance with par.7 of reference (a), a high frequency regenerative circuit was constructed (see schematic diagram). This circuit was tuned to approximately 18.2 megacycles, the regeneration being controlled by the potentiometer "R" which has a dial calibrate in units of two degrees. The subject switch was connected into the grid circuits as shown. The short test jumper was connected as shown by the dotted line and the dial setting at which the oscillation as shown by the dotted line and the dial setting at which the oscillation click occurred was noted. The circuit was always checked in this condition before making any tests wo assure a constant reference point. The jumper was then removed and the point at which oscillation started was noted for each of the several combinations. In order to facilitate the recoding of data, the switch sections were designated by A, B, C, D, the D section being closest to the mounting end and the A section being at the rear of the switch. The individual contacts were numbered in a clockwise direction, looking at the rear of the switch; i.e. 1,2,3. Therefore the complete roster of contacts is A1, A2, A3; B1, B2, B3; C1, C2, C3; D1, D2, D3. The circular contact rings on the movable shaft are designated by ring "A", ring "B", ring C" and ring "D"
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 17, 1937
- Accession Number
- AD1153551
Entities
People
- R. H. Worrall
Organizations
- United States Naval Research Laboratory