Smooth frequency control generator for P134. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Smooth frequency control generator for P134. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Generators, heterodynes

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Discrete frequency setting in 1 kHz steps in the R134 makes it difficult to use for amateur radio purposes. It is quite simple to get the possibility of smooth frequency tuning up to ± 4 kHz relative to the tuning frequency on the digital scale of the radio station. To do this, it is enough to replace the signal with a frequency of 10 MHz supplied from the frequency synthesizer of the radio station (block 2-1) through the multiplier of block 3-3 to the mixer of block 3-1 with a signal of a 500 MHz quartz oscillator tunable up to ± 10 Hz according to the circuit shown in Fig. .one.

Fine Frequency Generator for P134
Ris.1

Since the mixer of block 3-1 uses the eighth harmonic of the generator, the operating frequency of the radio station will vary within ± 4 kHz, which is quite enough. Resistor R7 in the circuit is selected within 0,5 ... 2 kOhm, depending on the activity of the applied quartz, until the nominal signal level at the radio station output is obtained with the key pressed in AT-T mode. Coil L is made on an annular magnetic circuit of the 50VCh2 brand, size K7x4x2, with a PELSHO wire of 0,1 mm and contains 15 turns. Using a well-calibrated receiver, it is desirable to select the number of turns of the coil with an accuracy of one to obtain the generator frequency of 10 MHz ± 50 Hz in the middle position of the R4 regulator, while the operating frequency of the radio station will correspond to the frequency on the digital scale. It is desirable to use a quartz resonator in a vacuum version. The +12,6 V generator can be powered from the decoupling filter capacitors C2 ... C6 in the power supply circuit of unit 2, which can be accessed by removing the top unit N9 of the radio station.

The printed circuit board of the device is shown in Fig. 2, the location of the parts on it - in Fig.3.

It is convenient to place the board in a shielded cassette block with dimensions of 140x70x30 mm, mounted on the radio station case to the left of the operator. On the front side of the unit, in addition to the radio frequency adjustment knob from the resistor R4, it is convenient to place a telephone jack, a toggle switch for turning on the tone generator and a toggle switch that duplicates the operation of the radio station's tangent in the "transmit" mode.

Author: B.Pavlov (EW1BB), Minsk; Publication: N. Bolshakov, rf.atnn.ru

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