Fox hunting transmitter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Civil radio communications
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This transmitter can operate in two bands 3.5 (with A1 modulation) and 144 MHz (with A2 modulation). It contains separate radio frequency paths for each of the ranges and a common automatic manipulator, which consists of an electronic clock with a "fox" code generator that provides code transmission for a minute and a four-minute pause. The manipulator also generates a modulating signal with a frequency of about 1 kHz. Transmitter power on both bands 2...3 W, modulation factor 60...75%.
The transmitter is made on transistors and integrated circuits of the K134 series. The supply voltage of the entire device is 10 ... 12 V. Four rechargeable batteries 2KN20. connected in series, provide continuous operation of the transmitter for 48 hours without recharging, and a battery of ten KNG3,5D cells - at least 15 hours.
Radio frequency paths (Fig. 1). The 3.5 MHz radio path contains a master oscillator based on a 1V4 transistor and a power amplifier based on 1V5 and 1V6 transistors. In the feedback circuit of the master oscillator - between the collector and the base of the transistor IV4 - a 1V1 quartz resonator is included at a frequency of 3,50 ... 3,65 MHz, operating at the first harmonic.
(click to enlarge)
From the P-circuit 1C9,1L5,1C10, included in the collector circuit of transistors 1V5 and 1V6. through the contacts of the range switch S1.2 and terminal X1, the signal enters the antenna, which is used as a wire 10 m long.
The 144 MHz master oscillator is made on a 1V7 transistor; a 1V2 quartz resonator at a frequency of 48 ... 48.6 MHz is included in its base circuit. The amplifier of this radio path is two-stage, on transistors 1V8 and 1V9. The interstage and output resonant circuits are tuned to the third harmonic of the quartz resonator. Through the coaxial socket X2, the output signal is fed to a half-wave dipole.
144 MHz range signal modulator three-stage, on transistors 1V1-1V3. A modulating signal with a frequency of about 1 kHz comes from the manipulator through circuit a. Transistor 1V3 of the final stage of the modulator is connected to the collector circuit of the transistor 1V9 through the contacts S1.3 of the range switch, and its contacts S1.1 switch the power supplied from the manipulator via circuit b to the operating radio path of the transmitter.
Authors: V. Kleimenov, S. Chikutov (UA3AGS); Publication: N. Bolshakov, rf.atnn.ru
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