GPA. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Generators, heterodynes
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The VFO circuit shown in Fig. 1 is designed for a transceiver with an IF of 500 kHz for the ranges of 160, 80 and 40 m.
A feature of the circuit is simplicity, the absence of scarce parts, convenient overlapping of ranges when using only one biscuit, slight frequency drift.
When using this circuit at higher frequencies (good work is noted up to a frequency of 30 MHz), KT2, VT363 - KT3, VT610 - KP1 should be used as a transistor VT307.
Instead of the resistor R3, when multiplying the frequency, you can put the circuit on the desired harmonic.
At the indicated ratings, the GPA covers frequencies of 7,500 ... 7,600 MHz; 4,00 ... 4,200 MHz and 2,330 ... 2,430 MHz, the tap from the L3 coil is made from the middle. C1 can be used from VHF broadcast receivers. MLT-1 resistors can be used as coil frames L2, L3, L2, having previously removed the conductive layer. In this case, it is convenient to adjust the inductance by turning on additional coils on the MLT 0.25, mounted on the range switch.
Temperature stability is selected by changing the TKE of capacitors C3, C4 (KSO, group G). On the bands 160 and 80 m, the level of harmonics can be large, if necessary, to reduce the level of harmonics, you can connect a shunt resistor to the right output of L2.
Author: V. Zhuravsky (ER4OT), Moldova, Soroki; Publication: N. Bolshakov, rf.atnn.ru
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