Contour coils of imported radio receivers. Reference data

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Contour coils of imported radio receivers. Reference data

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Encyclopedia of radio electronics and electrical engineering / Reference materials

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Currently, radio amateurs are increasingly faced with the need to repair imported radios. One of the reasons for their frequent failure is the malfunction of the loop coils. As statistics show, it takes second place after the breakdown of all kinds of switches. Although the marking of modern imported contour coils seems to be unified, it is very difficult to find information about it in the popular literature. It seems that the material I offer, obtained on the basis of the repair of inexpensive radio receivers and radio tape recorders from Aiwa, Panasonic, Sharp, as well as some unmarked Chinese-made models, will be useful to radio amateurs.

Most often, contour coils with dimensions of 10x10x14 mm and 8x8x11 mm are used in radio receivers (Fig. 1). All windings are usually wound in bulk with enameled wire with a diameter of 0,05 ... 0,12 mm on a ferrite magnetic core glued to a plastic base. The contour coils are wound over the coupling coils and filled with paraffin. The trimmer is a ferrite pot, which has a thread on the outer surface and a slot for a screwdriver. The entire circuit is enclosed in a brass screen. The circuits used in the IF paths have built-in capacitors.

Contour coils of imported radio receivers. Reference data
Fig. 1

The color marking of the coils is spots or stripes of paint applied respectively to the bottom of the magnetic core or to the screen. Schemes of loop coils are shown in fig. 2.

Contour coils of imported radio receivers. Reference data
Fig. 2

The table shows the winding data, purpose, capacity of the built-in capacitor and color coding of coils with dimensions of 10x10x14 mm. Loop coils with dimensions of 8x8x11 mm have the same purpose and capacity of the built-in capacitor, but their windings can be wound with thinner wire and contain a larger number of turns. These coils are less maintainable than 10x10x14 mm coils.

Color markings	appointment contour coils	scheme inclusion windings according to fig. 2	Rooms conclusions windings	Number turns	Емкость built condenser, pF
Yellow	IF-AM filter 455...460 kHz	а	1-2-3 4-6	100 + 50 9	190
White	IF-AM detector 455...460 kHz	б	1-2-3	50 + 50	410
Orange	IF-FM filter 10,7MHz¹⁾	в	1-3 4-6	12 2	75
Lilac	IF-FM filter 10,7 MHz	в	1-3 4-6	11 2	90
Pink	IF-FM discriminator 10,7 MHz²⁾	г	1-3	7	190
Green or blue	IF-FM discriminator 10,7 MHz²⁾	г	1-3	11	90
Red	LO circuit AM SV-DV	e, f, w	1-3 4 - 6, 2 - 3	80 100 ...³⁾ 8 12 ...
Without markings	Input MW circuit in car radios Input and heterodyne KB contours	e, f, w	Turn ratios loop coils and coupling coils are different for different models

¹⁾Can be used instead of blue and green. In this case, the 4-6 coupling coil is not connected to the board.

²⁾Used with various microcircuits.

³⁾The number of turns depends on the capacity of the KPI. The ratio of the number of turns of the windings of the contour coil and the coupling coil is selected within 10:1-8:1.

Publication: cxem.net

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Comments on the article:

a guest
according to reference data on ka22427. tda1083, uln2204a no containers = 190 r 410 r-cost 180 and 390. correct this inaccuracy ..

a guest
455 kHz-4 var with C=180 K=5.9. 455 k with C=220 r and 455 C =280 K=6.7..W=K*(L μG) to the power of 1/2 at 10.7 MHz-6 variants with C=47.75.82.150.180.390 r.K avg=6.6

a guest
According to tda1083, the data on the circuit-190 r is not 180, there is no capacity 410 r-there is 390 r.

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