Meter of impedances of broadcasting antennas of ranges LW and SV. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Measuring technology

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This device is designed to measure the total conductivities (active and reactive) of broadcasting antennas in the LW and MW ranges. The measurement range of active conductivity in mMo is from 0,1 to 111, and the reactive conductivity in pF is from 10 to 11100 in the frequency range from 0,15 to 2 MHz. An accuracy of 5% was obtained in the field, and 2% in the laboratory. The device is an asymmetric bridge to which the operating frequency of the antenna is supplied from the GSS G4-102 through a power amplifier. The balance of the bridge is controlled by a built-in receiver consisting of a local oscillator, a balanced mixer, and a selective telephone amplifier.

The bridge without an antenna is balanced by the minimum tone level of the GSS and local oscillator signal beats using elements C34 and R30, and with the connected antenna using sets of resistances R31, R32, R33 and capacitors C35, C36. Calibrated resistances and capacitors are soldered on 11-position biscuit switches. If the reactance of the antenna is inductive in nature, then a set of capacitances is connected to the antenna arm of the bridge using switch S2 and balancing continues.

(click to enlarge)

The use of the device allows you to tune the antenna-feeder path, and accurately calculate (using an RF kilovoltmeter) the power supplied to the antenna. Unlike instructions for radio amateurs, radio centers measure the input power to the antenna, and not to the transmitter.

Publication: shustikov.by.ru

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