GIR wavemeter - quartz calibrator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The diagram of this combined instrument is shown in the figure. The presence of a built-in quartz calibrator in it greatly expands the possibilities of application and improves the accuracy of measurements. It is also possible to apply a grid of calibrated frequencies to the wavemeter scale.
In the lower (according to the diagram) position of the switch V1, the RF oscillations are fed through the capacitor C6 to the wavemeter circuit and the moment it is tuned to the frequency of the quartz or its harmonic is fixed by the maximum deviation of the microammeter needle. Tuning the circuit to the first harmonic causes the maximum amplitude of the RF voltage to appear on the circuit, so the sensitivity of the indicator has to be reduced using resistor R3. With an increase in the number of the harmonic to which the circuit is tuned, the amplitude of the RF oscillations decreases.
The presence of a sensitive indicator allows you to use the device as an indicator of field strength when tuning antennas.
As a choke Dr1, a DV or MW coil of a broadcasting receiver can be used. Loop data L1C1 depends on the required frequency range of the device.
For the 4-30 MHz range, the L1 coil contains 20 turns with a tap from 5, counting from the lower (according to the diagram) output, PEL wire 0,29. It is wound coil to coil on a frame with a diameter of 5 mm. Trimmer core - from the core SB-12a. Capacitor C1 in this case can be used by Tesla by connecting both of its sections in parallel.
Author: I. Krylov (UA6AAG), Abinsk, Krasnodar Territory; Publication: N. Bolshakov, rf.atnn.ru
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