KBV meter with auto-calibration. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The presented circuit of a two-channel CBV meter serves for direct reading of the CBV values, in a symmetrical transmitter feeder, on the scale of a pointer indicator without preliminary calibration by the incident wave signal. The circuit provides high measurement accuracy when the transmitter power changes over a wide range (more than 100 times) without additional adjustments.
(click to enlarge)
The pointer indicator is graduated in KBV (SWR) values. To calibrate the device, it is enough to simultaneously apply the same voltage to the inputs Upad and Urep (for example, -1 V) and set the instrument pointer to the maximum deviation. All. Now apply voltage from the detectors of the incident and reflected wave sensors and take measurements. For coaxial feeders, one channel is sufficient. Because levels are stabilized by pulse-width switching (due to the presence of an inertial link R2C1 in the feedback), then the selection of pairs of keys VT1, VT2 is not required.
Publication: shustikov.by.ru
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