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Encyclopedia of radio electronics and electrical engineering / Civil radio communications
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This radio station, created several years ago by the famous amateur radio designer Vladimir Timofeevich Polyakov (RA3AAE), unfortunately has a typical fate for many good developments. When personal radio communication was allowed in our country, the filling of the radio station market was mainly due to imports. There are no words - modern multi-channel radio stations with a frequency synthesizer and various service amenities are simply good. But they are also priced very well. Many potential users cannot afford them today. And simple and, accordingly, cheap radio stations "in the west" are no longer produced today. Not happy with such radio stations and the domestic industry. What is produced is cumbersome and unreliable in operation and relatively expensive.
Starting work on this radio station, V. Polyakov set himself the task of developing an easy-to-replicate design. As a result, a small (dimension 170x66x32 mm) and light (weight 350 g) radio station was created, which allows communication with the same type at a distance of about 1,5 km when using the built-in telescopic antenna and up to 3 km with an external antenna 2,5 long .. .3 m. The schematic diagram of the radio station is shown in the figure.
(click to enlarge)
Attempts by V. Polyakov to release this radio station in the factory version were unsuccessful, despite the fact that, unlike many amateur developments, it was worked out to the design documentation. This story ended with the fact that the version of the radio station, designed to work on the "neighboring" amateur band of 10 meters, was described in the "KB magazine" (N 4-5 for 1993).
Here are the main technical characteristics of this radio station. The power given by the transmitter of this radio station to a matched load with a resistance of 50 ohms at a supply voltage of b, 7,5 and 9 V is 0,1, 0,2 and 0,3 W, respectively, the current consumption is 55, 70 and 90 mA. The frequency deviation at maximum modulation is about 2,5 kHz, the audio frequency range at the level of -3 dB is 300 ... 3 Hz To improve speech intelligibility, a blockage of the low-frequency components is possible ... 000 dB. The emission bandwidth at the level of 12 dB - no more than 30 kHz, the level of spurious emissions - no more than 11 dB. The output impedance of the transmitter is 40 ohms. The sensitivity of the receiver at a signal-to-noise ratio of 50 dB is no worse than 12 μV, the selectivity for adjacent and side reception channels is no worse than 1 dB. The range of reproducible frequencies according to the level of -40 dB is 3 ... 300 Hz. The output power at the above values of the supply voltage is 3 and 000 mW, respectively, the current consumption is 60, 100 and 150 mA. Volume control limits - not less than 12 dB. Permissible value of the input signal - from 14 μV to 16 mV.
The radio station is powered by a built-in battery, composed of six TsNK-0,45 batteries (initial voltage 7,5 V) or the same number of 316 cells (9 V). When discharging to 6 V, the rechargeable battery ensures the operation of the device for 5 hours for transmission and more than 30 hours for reception. With a fresh galvanic battery (supply voltage - 9 V), long-term (more than 0,5 min) continuous operation in the transmission mode is not recommended due to the rather significant heating of the transmitter output stage transistor. The radio remains operational when the battery is discharged to 5 V (i.e., to 0,83 V per cell).
Author: V.A.Polyakov, Moscow; Publication: N. Bolshakov, rf.atnn.ru
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