GKCH - 0,15 - 230 MHz. Scheme, description

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GKCH - 0,15 - 230 MHz. 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 swept frequency generator is designed to measure the frequency response of high-frequency paths in the range from 150 kHz to 230 MHz.

(click to enlarge)

A high-frequency signal (voltage 0-0,25V) is fed from the "output HF" socket to the input of the device under test. The variable resistor regulates the required RF output level. From the output of the device, the signal is fed to the detector head "Detection head", from the output of which the detected signal is fed to the Y input of the oscilloscope. The variable resistor "frequent" sets the center frequency, and the resistor "deviation" sets the sweep bandwidth (up to 20 MHz). At the entrance "i.o.x." negative pulses are applied at the moment of the beam reverse. A sawtooth voltage is applied to the sawtooth input. The output "met.out" is connected to the "in.met" of the measuring head.

The amplitude of the marks is also adjustable. Label generator internal - at 1MHz and 10MHz. If necessary, a different frequency can be applied to the input "met.external". Reverse pulses, switching the trigger, alternate the initial position of the beam and the frequency response through the line. This combination of characteristics allows you to see the frequency response relative to its zero. Shaper "i.o.h." and the sawtooth voltage from the output of the oscilloscope sweep is shown below.

GKCH - 0,15 - 230 MHz

Setting

By selecting a resistor in the trigger block, set the minimum amplitude modulation, with maximum deviation. The HPF contour tuning frequencies are shown in rectangles. The bandwidth of the HPF0 is 250 MHz, with a minimum non-linearity of its frequency response. The RF signal amplifier is tuned by elements with an asterisk for the highest frequency response uniformity in the range of 0-250 MHz. In the shaper, by selecting a resistor, the required swing of the "saw" is set.

All blocks and connections must be well shielded!

Author: Vladimir Sokolovsky; Publication: N. Bolshakov, rf.atnn.ru

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