FIELD: physics.
SUBSTANCE: invention refers to tuneable pass-band filters (PBF) of receivers and transmitters. In input and output PBF contains, two serial communications, i.e. inductive (1) and transformer (4), and between PBF resonant circuits transformer coupling communications (10) designed as structural component with windings on one frame. Note that communication windings of non-adjacent resonant circuits are located on both sides relative to winding of centre resonant circuit.
EFFECT: maintenance of constant relative pass-band within whole operating frequency range.
2 dwg
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