SWR meter direct reading. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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SWR meter direct reading. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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The small size SWR meter proposed by KA2WFJ is based on a stripline directional coupler. To indicate the currents of the direct and reflected waves in the line, a linear indicator based on the LM3914 chip and a line of ten LEDs, which can be made on the basis of a special assembly or simply consist of discrete diodes, is used.

Direct reading SWR meter
Ris.1

Diodes D1 and D2 must be germanium. Resistor R1 must be set on pin 6 of the U1 microcircuit to half the direct wave voltage, and resistors R3, R4 - about 90 mV at pin 4 U1, then the last LED of the matrix will respond to SWR = 3. The directional coupler is configured with resistors R5, R6 in the usual way.

The design of the coupler is shown in Fig.2.

Direct reading SWR meter
Ris.2

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