Universal matching device. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Universal matching device. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / HF antennas

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For everyday work on the air on KB bands and various experiments with receiving and transmitting antennas on an amateur radio station, it is advisable to have an antenna matching device. The use of such devices allows you to create a normal operating mode for the output stage of the transmitter (if the input impedance of the antenna is noticeably different from the output impedance of the transmitter) and thereby increase the overall efficiency of the radio station. In addition, in some cases, the antenna matching device can provide additional suppression of the harmonic components of the transmitter output signal, thereby reducing the risk of television interference.

Universal matching device

A diagram of an antenna matching device with wide capabilities is shown in Figure A. The desired configuration for connecting matching elements L1, C1 and C2 is created by connecting jumpers to the contact field formed by sockets X2-X19. A possible variant of placing these sockets on the front panel of the device is shown in Figure B. The distances between adjacent sockets horizontally and vertically (except for the distances between X2 and X7, X4 and X9) must be the same. This will make it possible to use only five identical jumpers to create any configuration of matching elements.

In addition to the P-loop (it is obtained by installing jumpers between sockets X11-X12, X3-X5, X8-X7, X13-X14, X17-X18), six more options for switching on elements can be implemented in this device. They are shown in Figures C - H and are obtained when installing jumpers: B - X3-X5, X7-X8, X11-X12; G - X3-X5, X10-X11, X8-X9; D - X3-X4, X6-X8, X10-X11; E - X2-X3, X6-X8, X11-X12; F - X3-X5; X10-X11, X14-X15, X16-X17; Z - X3-X5, X11-X12, X14-X15, X16-X17.

Each of these options for switching on elements provides coordination with the transmitter (output impedance 50 ... 76 Ohm) of loads with well-defined active (R) and reactive (X) components:

B - R < 50 Ohm, X < 0; G - R> 50 Ohm, X> 25 Ohm; D - R > 50 Ohm, X < 25 Ohm; E - R> 50 Ohm, X> 0; W - R < 50 Ohm, X > 25 Ohm; Z - R < 50 Ohm, X < 50 Ohm. These parameters are provided if the maximum capacitance of the capacitors C1 and C2 is 200 pF, and the maximum inductance of the coil L2 is 20 μH.

Literature

Frantz C. A. New More Versatile Transmatch.- QSt, 1982, July, p. 31.
Radio No. 10 1983

Publication: cxem.net

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