In connection with the increasing number of vehicles and the remoteness of the garage to the apartments is on the agenda, the issue of protection of cars at night in the courtyards of houses. If you steal a car is difficult, it is possible to remove the logo, remove the radio or battery is not too difficult. Most anti-theft devices only complicate the running of the motor vehicle, but do not protect against, theft of content.
There are devices that trigger on the swing, the Executive node which is a siren or car horn. At night they Wake up not only the owner, but also neighbors. Disconnecting the battery is fully takes the device out of operation.
From all these drawbacks offer free radiozero. We will consider its work.
Radiozero consists of a high-frequency oscillator, modulator and detector swing. In standby mode, the sensor will swing open, and the power is supplied only to the generator. The receiver is located in the apartment, is configured on a carrier frequency generator for the loss of noise in the speaker.
Thus, even if you disconnect the battery the alarm goes radiostacja is determined by sharp) increase in noise, and it is also a sign of the health of the line "machine - flat".
When you touch the car briefly closed the swing sensor B1 (Fig.2). Through his contacts, power is supplied to the modulator and charging the capacitor With 1.
After the contact opening sensor power modulator is supplied from the capacitor to the next circuit. Voltage damped low-frequency oscillations from the output of the modulator is modulated RF generator. In the receiver there is a loud intermittent alarm. The frequency of the high frequency generator is determined by the frequency of quartz (3..5 harmonics) and is in the range of 64...75 MHz or 88...108 MHz for European standard. Coil L1 has 6 turns of wire PEL of 0.6 on the frame with a diameter of 6 mm, the Coil L2 - 2 turns PEL of 0.3. The range of Radiolaria from the car without antenna - up to 50 m. Several such devices have been tested for 2 years and have shown reliable operation.
Collected schemes, and advice can be obtained from the author.
Literature
- Miles G. Electronic remote control models. - M.: DOSAAF, 1980.
Author: N. Martynyuk; Publication: N. Bolshakov, rf.atnn.ru