Pocket radio Moscow. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / radio reception

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At the numerous requests of readers, the editorial board re-publishes brief design data and a diagram of the amateur pocket radio "Moscow" designed by V. Plotnikov ("Radio", No. 11, 1959).

(click to enlarge)

The radio receiver operates in the range of 300-1800 m. For the magnetic antenna, a F-600 ferrite rod 80 mm long and 8 mm in diameter is used, on which a frame made of thin paper is put on. Coils L1 and L2 are wound on the frame, each containing 130 turns of PELSHO-0,12 wire. The total length of the coil winding is 25 mm. Coupling coil L3 has 3-5 turns of the same wire wound over coils L1 and L2. The Tp1 transformer and the RF inductor are wound on NTs-2000 ferrite rings with an outer diameter of 7 mm. Windings L4, L5 and L6 contain 100, 10 and 200 turns of PELSHO-0,12 wire, respectively.

The receiver uses a self-made loudspeaker made on the basis of a DEMSh-1 type capsule. The receiver is powered by three elements of the FBS-0,25 type and consumes 8-10 mA. It is recommended to use transistors with the following gain in the receiver: T1-40-80 (collector current 0,8-1,5 mA); T2-30-80 (collector current 0,3-0,5 mA); T3-20-30 (collector current 0,3-0,5 mA); T4 - 40-80 (collector current 4-6 mA).

The receiver is placed in a plastic case with dimensions of 96x74x27 mm. Receiver weight 180 g.

Author: V.Plotnikov; Publication: N. Bolshakov, rf.atnn.ru

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