VHF converter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / radio reception
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The Dutch ham radio PA0GVK has designed a simple 144 MHz converter, the main feature of which is the use of a balanced Schottky diode mixer (see figure). One such diode is also used in the frequency multiplier. The intermediate frequency (variable) of the converter is selected in the range of 6-8 MHz, so the local oscillator frequency is 138 MHz. It is obtained by multiplying the frequency of the Pe1 quartz resonator operating at the fifth mechanical harmonic. Although the converter circuit is really simple, attention should be paid to the care in its manufacture and settings.
(click to enlarge)
The LIC1 circuit must be set to 23 MHz. Coils L2-L5 are wound on a frame with a diameter of 5 mm and contain: L2-8 turns (outlet from 1,5). winding length 20 mm: L3-5 turns (bends from 1,5 and 2,5), winding length 16 mm; L4 to L6 - 5 turns each (outlets from the middle), the winding length of each coil is 10 mm.
Coil L6 consists of 12 turns (outlet from the middle), L7 - of 6 turns. These coils are wound with three wires on a 6 mm diameter toroidal ferrite core.
Inductors Dr1 and Dr2 are ferrite rings put on mounting conductors.
The converter can use KD514A diodes and KT315 series transistors (with any letter index). For winding coils, a silver-plated wire with a diameter of 0,8-1 mm can be used.
Literature
- "Radio Communication" (England), 1975, No. 10
Publication: N. Bolshakov, rf.atnn.ru
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