Jackson Bell Co., Ltd. 205 Schematic

Jackson Bell Co., Ltd. 205

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Manufacturer:Jackson Bell Co., Ltd.

Schematic Pages

PNG: Page 1 Rider Manual Volume 3

Schematics Content

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Hodel 205 Data

The tuning range of the receiver is 550 to 1,750 kc., and reception of the 2,480 - kc. police signals as an image frequency. The intermediate frequency used is 465 kc.
The most interesting feature of this receiver is the control unit which, instead of merely consisting of the usual remote tuning dial and volume control, actually contains the type'57 combination first detector and oscillator tube together with the associated units. This unit is then coupled to the intermediate-frequency amplifier by an i - f. transmission line contained in a shield along with the "A" and "B" feed ires, etc. The intermediate frequency and audio units are in a case with an eight-inch Laosing speaker, making the whole a two-unit job with re. mote control and no flexible shafts,
The i-f. feed line has at each end a coil composed of three turns of wire around a standard 1 - f. bobbin, and the line may be 15 feet long without causing appreciable loss the loss with a 15 - foot run being about 5 db. The two type 58 tubes in the intermediate frequency stages are used as standard rf pentodes. AVC is provided by the type's second detector cube which feeds the type 47 output pentode Tocal plate current is 18 ma at 180 volts Care should be taken with the B + terminal as it is inclined to short to the chassis, in which case the 900 - ohm bias resistor for the'47 tube will blow, as well as the electrolytic condenser shunting it The plate winding on the oscillator coil in the control unit suffers seriously from electrolysis