Coils on carbonyl rings. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Coils on carbonyl rings. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Reference materials

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Recently, radio amateurs have often begun to use contour coils wound on ferrite rings. Such coils are very convenient, since they are small and in some cases make it possible to do without screens due to the insignificant stray field.

But rings made of ferrite, which has a high permeability, are unsuitable for winding coils of circuits with a high resonant frequency (above 1 MHz). For such coils, it is best to use carbonyl iron rings, which can be made from SB-2 or SB-3 potted cores. The process of making rings is shown in the photo.

Coils on carbonyl rings

The photo shows that the core cup breaks off (a). Rings (c) are sawn off from the remaining part (b) with a slotted saw. On the right in the photo (d) shows a finished IF transformer wound on a sawn-off ring.

The table shows the data of the coils of IF transformers for various frequencies, wound on carbonyl iron rings with dimensions of 11X7X4 mm, made from SB-3 cores.

Frequency, MHz	Number of turns	Wire brand and diameter, mm	Inductance, uH	Capacitance of a parallel connected capacitor, pF	Quality factor, Q	Winding method
1,6	75	LESHO 7X0,07	17	470-510	160-170	in bulk
6,5	32	PEV-1 0,21	4,5	100-130	170-180	ordinary
10,7	22	PEV-1 0,44	2,3	82 10-0 XNUMX	170-180	ordinary

Tuning the described coils into resonance is done by trimmer capacitors.

Author: A.Akimov (UA3AG), Moscow; Publication: N. Bolshakov, rf.atnn.ru

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