CN2531582Y

CN2531582Y - Encipherment FM broadcast transmitter/receiver

Info

Publication number: CN2531582Y
Application number: CN 02207873
Authority: CN
Inventors: 罗泓
Original assignee: ELECTRONIC APPARATUS FACTORY SHICHENG COUNTY JIANGXI PROV
Current assignee: ELECTRONIC APPARATUS FACTORY SHICHENG COUNTY JIANGXI PROV
Priority date: 2002-03-12
Filing date: 2002-03-12
Publication date: 2003-01-15
Anticipated expiration: 2012-03-12

Abstract

The utility model relates to an encrypting frequency modulation broadcasting transmitting/ receiving machine, composed by a transmitting circuit and a receiving circuit. The transmitting circuit comprises a frequency vibration circuit, a signal producing circuit, a modulation circuit wherein the signal producing circuit is composed by an IC2, an IC3, an IC5, an IC6 and an IC9 and the modulation circuit is composed by an IC1, an IC4, an IC7 and an IC8; the receiving circuit is composed by an ANT1, an IC1, an IC2, an IC3, an IC4, an IC5 and an IC6. The utility model has the advantages of stable work, strong anti-interference ability and status following ability.

Description

Encrypt the FM broadcasting transmitter/receiver

The utility model relates to a kind of encryption FM broadcasting transmitter/receiver.

The high-power reception audio amplifier of FM broadcasting outdoor generally adopts CF signal realization automatic switching or adopts common audio coding remote control switch at present, and its poor anti jamming capability often occurs opening by mistake the shutdown phenomenon, influences the life and the rest of surrounding resident.

The encryption FM broadcasting transmitter/receiver that provides a kind of antijamming capability strong is provided the purpose of this utility model.

The technical solution of the utility model is:

Signal generating circuit: the shake output of circuit of frequency base is connected with IC3 with IC2, ties mutually with 14 pin of IC9 by T2 again, and the output of IC5 is connected with 1 pin of IC6 by T4, and 3 pin by T3 and IC9 join again, and 1 pin of IC9 and 13 pin and IC5 join;

4 pin of modulation circuit: IC1 and 12 pin of IC8 join, and 1 pin of IC8,2 pin, 6 pin link to each other with electronic switch IC4, and IC4 links to each other with IC7, and 16 pin of IC7 join through T9, R21, C9 and IC5;

Receiving circuit: 12 pin of antenna ANT1 and IC1 join, and 14 pin of IC1 join by 17 pin of R29, JP1 and IC1, and 23 pin of IC1 are leaded up to 24 pin of L5, C3 and IC1 and joined, and send into power amplifier by the 27 pin output of IC1 again; One the tunnel is sent into 12 pin of IC2 by T1 behind C48, L1, C27, C25, join via 14 pin of IC2 and 2 pin of IC3, sends into IC3, IC4, IC5, IC6 again.

The utility model stable work in work, accuracy reaches 100% under the remote state, and other signal that it receives under the function rejection same frequency has superpower antijamming capability, and has the state follow-up capability, no matter whether receiver has a power failure, instant identification.

Fig. 1 is the utility model transmitter circuitry figure.

Fig. 2 is the utility model receiver circuit figure.

Now be further described below in conjunction with the accompanying drawings:

As Fig. 1, the basic vibration frequency that Q1, T7, T1 produce, carry out frequency division by IC2, IC3, send into 14 pin of IC9 by T2, the frequency of the SCA signal of IC5 vibration is amplified 1 pin of sending into IC6 by T4 and is carried out frequency division in addition, is sent into 3 pin of IC9 then by T3, and the basic vibration frequency of 3 heels, 14 pin of IC9 compares, again by 1 pin and 13 pin output control signal, make behind the IC5 internal oscillator SCA signal from 2 pin outputting standards.

The frequency of oscillation that IC1 produces is exported by 4 pin, sends into 12 pin of IC8, is exported by 1 pin, 2 pin, 6 pin respectively behind the frequency division, remove to control electronic switch IC4, make IC7 produce continuous code signal, by the 16 pin output of IC7, send into IC5 through T9, R21, C9, the SCA signal is modulated.

As Fig. 2, FM signal receives 12 pin of sending into IC1 through antenna ANT1, after amplifying mixing, inside exports from 14 pin, send into 17 pin of IC1 by R29, JP1, behind inner demodulation of frequency discriminator, export two paths of signals by 23 pin, wherein audio signal is undertaken sending into power amplifier by the output of 27 pin after the Audio Processing by 24 pin that L5, C3 send into IC1; 12 pin that the SCA signal is sent into IC2 by T1 after through C48, L1, C27, C25 frequency-selecting carry out the SCA demodulation, and the digitally encoded signal after the demodulation exports 2 pin of IC3 to by 14 pin of IC2, is finished the remote control switch that receives audio amplifier by IC3, IC4, IC5, IC6.

Claims

1, a kind of encryption FM broadcasting transmitter/receiver is made up of radiating circuit and receiving circuit, and radiating circuit comprises by Q1, T7, T1 component frequency base shake circuit, signal generating circuit, modulation circuit, it is characterized in that:

Signal generating circuit: the shake output of circuit of frequency base is connected with IC3 with IC2, and 14 pin by T2 and IC9 join again, and the output of IC5 is connected with 1 pin of IC6 by T4, and 3 pin by T3 and IC9 join again, and 1 pin of IC9 and 13 pin and IC5 join;

Receiving circuit: 12 pin of antenna ANT1 and IC1 join, and 14 pin of IC1 join by 17 pin of R29, JP1 and IC1, and 23 pin of IC1 are leaded up to 24 pin of L5, C3 and IC1 and joined, and send into power amplifier by the 27 pin output of IC1 again; 12 pin of IC2 are sent on another road by T1 behind C48, L1, C27, C25, join via 14 pin of IC2 and 2 pin of IC3, send into IC3, IC4, IC5, IC6 again.