Converter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / radio reception
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I propose a converter circuit that works with any broadcast receiver that has medium and long wave ranges.
With the input circuit L1 indicated on the diagram, it is possible to receive radio stations in the 27 MHz band and amateur radio stations in the 28 MHz band.
(click to enlarge)
To increase selectivity, instead of the L1 coil, it is recommended to use a band-pass filter on the L4 coils, L5, L6, L7.
If there is no "Antenna" socket in the radio, it is recommended to turn on the L3 coil. It is wound on a ferrite rod 400 ... 600 NN from a transistor receiver with an MGTF wire with a diameter of 0,1 ... 0,25 mm and contains 70 turns.
The local oscillator on the VT3 transistor is tuned to a frequency of 28 MHz.
Coil L2 - frameless, wound with a wire with a diameter of 0,8 ... 1,2 mm and contains 12 turns, a branch from 1/3 of the turns from below. Winding diameter - 10 mm, winding length -17 mm. Coils L1, L4, L5, L6, L7 are wound on frames from HF circuits of broadcasting receivers with a diameter of 7 mm. Coils L1, L5, L6 contain 8 turns of PEV wire with a diameter of 0,3 mm. The coupling coils contain 3 turns.
The converter was mounted using the "surface" mounting method on a board made of double-sided foil fiberglass 1,5 mm thick. On the side where the installation is being carried out, contact pads are cut out with a cutter, the second side of the board is grounded.
The converter is located in the radio housing or in close proximity to it. When receiving SSB and CW radio stations in the 28 MHz band, it is necessary to make an additional "telegraph" local oscillator.
Author: A.Martynov, Arkhangelsk region, Severodvinsk; Publication: N. Bolshakov, rf.atnn.ru
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