Small radio station. Scheme, description

Small radio station. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Civil radio communications

The radio station operates in transceiver mode with AM at a frequency of 28, 200 kHz (resonators from the "Quartz" sets) and can be used to service "pale day" competitions, tune HF and VHF antennas. Power supply: Krona battery, current consumption in receive mode - 8 mA in transmit mode - 20 mA. Dimensions with folded antenna -130 x 65 x 22 mm.

The maximum communication range with the same type of radio station in open areas is up to 1 km. Confident communication - 300-500 meters. When communicating with a stationary TRCVR (UW3DI in AM mode, GP antenna) in a city - up to 5 km.

(click to enlarge)

Details and design: telescopic antenna from the VEF receiver; an electromagnetic microphone from a hearing aid was used as a microphone and telephone; switch - 4 buttons MP-12, soldered into a clip and united by one button; transistor BF115 can be replaced by KT608. The antenna insulator is made of PTFE, it has a current collector.

Switch - a pair of contacts, located on the antenna insulator, when the antenna is fully extended, the radio station turns on.

Transformer - permalloy ShZ x 6, windings: I - 650-700 vit., II - 900 turns PEV-1 0,1 coils: frames with a diameter of 5 mm, wire with a diameter of 0,5 mm.
LI -11 turns with a tap from the 3rd turn from the "cold" end.
L2 - 3 turns on the same frame with L1. L3 - 16 turns with a ferrite core.

Hinged mounting on a base made of brass foil 0,3 - 0,4 mm thick, PTFE insulators are fixed on it with the help of pieces of wire and soldering.

The base is fixed in a case milled from duralumin.

Establishment

Resistor R9 to set a stable mode of operation of the ULF. Depending on the instance of the IC, select from 0 to 10 kOhm and install a constant resistor. R3 - current in transmission mode; R4 and C7 - set the bandwidth and tuning frequency of the receiver; C5 - transmitter setting; L3 is tuned with the antenna fully extended in TX mode to the maximum reading on the S-meter or field strength indicator.

You can use a transformerless ULF and apply a modulating signal to the VT1 emitter. Microphone-phone apply DEMSh-1. This is exactly what UA3LCM did.

Literature:

1. Radio No. 6, 1982, p.52.

Author: V.Romanenkov (UA3LCI), Safonovo; Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Civil radio communications.

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