Tuning antennas and circuits using a jammer. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Tuning antennas and circuits using a jammer. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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In [1], the noise generator circuit shown in fig. 1. To work in this circuit, you can use any type of relay with the appropriate supply voltage and with a normally closed contact. In this case, the higher the relay supply voltage, the higher the level of interference generated by the generator. To reduce the level of interference on the devices under test, it is necessary to carefully shield the generator, and supply power from a battery or accumulator to prevent interference from entering the network.

Tuning Antennas and Loops with a Jammer

In addition to the adjustment of noise-protected devices, with such an interference generator, it is possible to measure and adjust high-frequency equipment and its components.

1. Determination of the resonant frequency of the circuits

When using a survey receiver with a continuous range or a wave meter, it is possible to determine the resonant frequency of the circuit under test from the maximum noise level at the output of the receiver or wave meter (Fig. 2). To eliminate the influence of the generator and the receiver on the parameters of the measured circuit, their coupling coils must have the minimum possible connection with the circuit.

Tuning Antennas and Loops with a Jammer

2. Determination of the resonant frequency of the antenna

When connecting the jammer to the antenna under test WA1 in Fig. 3, it is possible to determine its resonant frequency or frequencies in the same way as measuring the circuit.

Tuning Antennas and Loops with a Jammer

Literature

L. Shubin. Interference generator. Radio, 1962.

Author: I.N. Grigorov, RK3ZK, Belgorod; Publication: N. Bolshakov, rf.atnn.ru

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