RU5261U1 - RADIO MICROPHONE DETECTION DEVICE - Google Patents

Abstract

A device for detecting a radio microphone containing a series-connected antenna, a high-frequency amplifier, a detector, as well as a series-connected low-frequency amplifier, a loudspeaker, characterized in that a band-pass filter is connected between the detector and the low-frequency amplifier.

Description

DEVICE FOR DETECTING RMIOMIKROPHON

The device © ТН9SITES to the field of radio technology, in particular, to the settings for detecting radio microfot.

A device is known for indicating microwave frequencies of radiation containing n «sldv1at @ lnv connected antenna, m д fool« p, receiver and first in Ж К Ё § § м, modulating gene @ р р п, first р р в 1 б элемент элемент сев сев сев сев сев сев сев сев и и и и и и регист регист регист регист регист register element. The device also contains a third-party integrator, first and second charging keys, first and third analog inverters, analog totalizer, differentiator, second superheat element, element or, discharge key and counting trigger. Patent P $ No. 20A0005, G-OI5 13/00, B.I. No. 20D995g, pL99.

Ustreiotve is known for detecting a microfenneg amplifier, a ketfreve will contain a radio-frequency transmitter emitting a signal into the studied area of the country, a generator of shadow signals that emits signals to the same area of the country, and a radio frequency receiver that receives signals from the studied region that has a microphone complete c © resistance @ varying in time. US patent No. 5023616, G-OIS 13/74, Inventions of the countries of the world J 3, no. 85, 1993. pg. 31.

As a prototype, a direct amplification radio device consisting of a selective element, a high-frequency amplifier, a detector, a low-frequency amplifier, and a loudspeaker was selected. This circuit is most suitable for simple handheld receivers. Functional schemes of transistor receivers, Handbook of small-sized radio receivers, 1. I. Svetlakov, Dosaaf Publishing House, Moscow, 19b6g,

MM (JOI 13/74

The technical task to be solved is to ensure the secrecy of the operation of the device for detecting radio microfiber without reducing sensitivity to the input signal.

The technical problem to be solved is achieved by the means for detecting radio microphones, with a connected antenna, a high-frequency amplifier, a detector, as well as a gray hair

telmv connected low-frequency amplifier ratchet-giver a wood-cutter © is introduced, a passing filter, between the detector and the low-frequency amplifier The proposed technical solution satisfies the innocent criterion, since the authors did not find a similar solution to the technical problem of published infermation sources,

In Fig. I, a functional diagram of a device for detecting a radio microphone, which comprises a series-connected antenna I, a high-frequency amplifier, detector 3, and also series-connected low-frequency amplifier 4, loudspeaker 5, between the detector 3 and the low-frequency amplifier, is shown 4 includes a band-pass filter 6; Blocks included in the device can be made according to standard circuits published in the literature.

Consider the work of the slave device. When the detector of the radio microphone is turned on, the electromagnetic signals arriving at the antenna I are amplified by a high-frequency amplifier. The audio frequency signals are then sent to a bandpass filter 6 with a narrow passband. The central frequency of the filter passband should be equal to the frequency of the highest return of sound power to the loudspeaker 5, After the blown-through filter 6, low-frequency signals are sent to the low-frequency amplifier 4 and then to the pusher 5, If a radio microphone is located in the near zone from detector 3, t © ®n perceives noise vibration sounds emitted by the loudspeaker 5, These noises modulate the radio frequency emitted by the radio microphone and then received by our detector

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for the sake of mik®f © on. On the other side of the noise spectrum, the signal itself is activated by excitation of the radio mic system; the radio detector detects by ear in the form of a characteristic whistle whistle called micreff effect. As a rule, the frequency of excitement falls off with parts, on the catwray gr®mk @ g®B @ the chimer 5 has the maximum sound radiation power.

Thus, in comparison with the pretype, the presence of the intrinsic filter with a narrow passage

The sensitivity of the system to self-excitation is preserved, not sharply

peoterenntskh of. emissions are reduced due to the loss of speed by the 9-track JS 5, which

it makes it impossible to print secrecy of radio detectors of radio detectors.

Claims (1)

A device for detecting a radio microphone containing a series-connected antenna, a high-frequency amplifier, a detector, as well as a series-connected low-frequency amplifier, a loudspeaker, characterized in that a band-pass filter is connected between the detector and the low-frequency amplifier.