Manufacturing of transformers. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Nodes of amateur radio equipment
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In the manufacture of broadband HF transformers (for example, "Radio" No. 12/1988), a set of rings is put on copper tubes. When making my amplifier, I ran into the difficulty of selecting tubes of the required diameter. I propose a simpler way to manufacture such RF transformers.
From ferrite rings, two tubes of the required size are glued together. The insulation is removed from the coaxial cable, a piece of the required size is cut off from the exposed screen, so that two ferrite tubes fit on it and rings for the leads remain. After that, both ferrite tubes are put on the screen, and two turns of MGTF wire are threaded inside the screen (Fig. 1). Gradually, by pulling the ends of the wire, the tubes are brought together, after which the tubes are glued together with epoxy glue (Fig. 2).
Author: A.Zaitsev (RA4HJX); Publication: N. Bolshakov, rf.atnn.ru
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