Portable radio station Len in the alarm system. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Safety and security
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At present, many enterprises and individuals use the well-proven and fairly common Len-V radio stations (1P21V-3 in mobile and 1P21S-4 in stationary versions) for organizing communications. The simple add-on described here allows the station to be used to transmit an alarm signal over a considerable distance.
Perhaps it would be useful to recall that in order to go on the air, you must have permission. A slight refinement of the radio station will make it possible to connect it to the security alarm system and carry out remote control over the state of the protected object at a distance of 8 ... 15 km using a standard antenna. In the event of an alarm, a call signal is transmitted using a second tone generator. Duty reception is performed on an identical radio station or on a similar one tuned to the appropriate frequency, for example, R-111, R-171, etc. P.
The diagram of the device is shown in the figure.
When the security loop is opened (conditionally shown in the diagram as a switch SA2), transistor VT1 opens. At the same time, the trinistor VS2 opens, the relays K1 and K2 are activated, and K1 switches the radio to transmission mode, and K2 turns on the corresponding tone generator. The VS2 trinistor is held open by the current flowing through the relay windings (about 80 mA). Trinistor VS1 is designed to turn on an external signaling device - a siren, signal lamp, or both. Thus, local notification is also carried out.
When the SA1 toggle switch is closed, the security mode is disabled and the device does not depend on the state of the loop. Capacitor C1 is designed to protect the input of the device from impulse noise. To bring the system to its initial state, turn off the power of the radio station for 10...15 s.
Transistor VT1 series KT814, KT816, KT361 with any letter index. Trinistor VS1 - series KU201, KU202, VS2 - KU102 also with any indices. Relays K1 and K2 - RES-10, passport RS4.529.031-04, RS4.529.031-09, RS4.529.031-19. Resistors - MLT or S2-33.
Structurally, the improvement of the radio station comes down to installing an additional connector of the RP-15-9 type on its body and connecting the corresponding power and switching circuits to it.
By selecting the resistor R1, a reliable transition of the transistor VT1 to saturation mode is achieved with open contacts SA1 and SA2, and by selecting R5 and R6 - stable operation of the corresponding relays.
Author: D. Pankratiev, Tashkent, Uzbekistan
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