CN2157632Y - Short-range radio beeper - Google Patents

Abstract

The utility model relates to a small-power short-range radio beeper, composed of a transmitter and a receiver, wherein, the transmitter is composed of a coding circuit, a base-electrode double modulation oscillatory circuit, a power amplifier push circuit, a power amplifier circuit, a transmitting circuit and a transmitting antenna which are orderly concatenated; the receiver is composed of a superregenerative receiving circuit, a low-frequency amplifying circuit, a Schmidt shaping circuit, a decoding circuit, a decoding drive circuit and an acoustic-optic display circuit. The utility model has a low cost and does not need to set up an expensive main reception desk and a transfer desk, namely carrying out wireless beeping within certain limits, especially being suitable for use in public service places of small limits.

Description

Short-range radio beeper

The utility model relates to a kind of communication apparatus, especially a kind of small-power short-distance wireless beeper.

It is a kind of single worker's communication apparatus commonly used that beeper is commonly called as beeper, and it is small and exquisite with volume, and is easy to carry, and range of receiving is subjected to the favor of consumption market greatly.But beeper must be set up total transmitting station, and carries out transfer by intermediate station.Because transmitting power is bigger, so transmitter is bulky, cost an arm and a leg, can't use inner the popularizing of subsection.

The purpose of this utility model, it is less to be to design a kind of transmitting power, need not to set up the low-cost small-sized short-distance wireless beeper of general reception desk and intermediate station.

The utility model is made of reflector and receiver two parts.Reflector can be launched the code signal that pre-sets through antenna, receiver then is used for received encoded signal and carries out acousto-optic showing, receiver is carried into the task of can finish the coding indication according to the prompting of signal.

Reflector of the present utility model is by coding circuit (1), and modulation oscillator circuit (2), power amplifier promote circuit (3), and power amplifier (4), radiating circuit (5) and transmitting antenna (6) cascade in regular turn constitute; In modulation oscillator circuit (2), modulating input signal has been added the base stage and the collector electrode of modulating oscillation triode simultaneously.Receiver is by Armstrong circuit (7), low-frequency amplifier circuit (8), decoding circuit (10), decoder driver circuit (11), display circuit (12) cascade in regular turn forms, on decoding circuit (10), can insert sound circuit (13), enter decoding circuit (10) behind the output signal process schmidt shaping circuit (9) of low-frequency amplifier circuit (8).

Describe the utility model in detail below in conjunction with embodiment

Fig. 1 is reflector principle of compositionality figure;

Fig. 2 is receiver principle of compositionality figure;

Fig. 3 is a kind of embodiment of reflector;

Fig. 4 is a kind of embodiment of receiver;

Fig. 5 is modulation oscillator circuit (A point) output waveform figure (is example with the amplitude-modulated oscillation);

Fig. 6 is Armstrong circuit (B point) output waveform figure;

Fig. 7 is schmidt shaping circuit (C point) input oscillogram;

Fig. 8 is schmidt shaping circuit (D point) output waveform figure.

In the present embodiment, coding circuit (1) has adopted the coding integrated circuit (IC) ₁, to input signal location coding and digital coding simultaneously; Work as IC ₁When adopting yyH26, the 1-9 pin is an address code, and the 10-13 pin is a numeric data code, and forms pre-set code signal by on off operating mode.Between 15 pin and 16 pin, insert R ₁, insert C between 15 pin and 14 pin ₁, 14 pin ground connection just can produce the local frequency of 3500Hz-4000Hz, and the local frequency that present embodiment is selected for use is 4000Hz.The coding output signal of coding circuit (1) can enter modulation oscillator circuit (2) after low pass filter leaches low frequency signal.Present embodiment has been connected in series an inductance coil L between coding circuit (1) and modulation oscillator circuit (2) ₁As simple low pass filter.Oscillating circuit (2) is by generator triode BG ₁, R ₂, R ₃, R ₄, C ₃, C ₄All B in reaching ₁Constitute.R ₂With R ₃Constitute the series connection divider resistance and insert BG ₁Base stage provide base stage modulating input signal, C for circuit at the corresponding levels ₄With B ₄Primary coil constituted and be connected to BG ₁The shunt-resonant circuit of collector electrode provides collector electrode input modulating signal, B for the corresponding levels ₁Secondary output signal then be the input signal that back one-level power amplifier promotes circuit (3).R ₄With C ₃Be to be connected to BG ₁The negative feedback component in parallel of emitter.Above-mentioned connecting mode makes the low-frequency pulse code signal added BG simultaneously ₁Base stage and collector electrode realized that basic utmost point the two poles of the earth double modulation can form amplitude-modulated wave, the centre frequency of present embodiment amplitude-modulated wave is 27MHz.If BG ₁Base stage join by quartz crystal oscillator device and divider resistance, also can realize frequency-modulated wave in the corresponding levels.BG ₂, R ₅, R ₆, R ₇, C ₅, C ₆, and B ₂Primary coil has constituted power amplifier jointly and has promoted circuit (3).B ₂Secondary coil and C ₁The antiresonant circuit and the BG that constitute ₃Constituted power amplifier (4) jointly.C ₃And B ₃Antiresonant circuit is as radiating circuit (5).The output signal of power amplifier is by B ₃Centre cap input radiating circuit, with the coding output signal of reflector through and B ₃Inferior grade coupled antenna (6) is launched.The transmitting antenna (6) that present embodiment adopts is a helical antenna.In the present embodiment, between the DC power supply of reflector and ground, inserted the R that connects ₈And light-emitting diode D, the operating state of reflector is controlled by switch T.Reflector is in off-mode does not at ordinary times work, and this moment, T disconnected; Connect T during use, the bright indication reflector of light-emitting diode is in running order.

In the embodiment of receiver, BG ₄, R ₉, R ₁₀, R ₁₁, R ₁₂, C ₁₁And B ₄Constituted Armstrong circuit (7).The reflector coding signal transmitted by with B ₄After inferior grade coupled antenna receives, BG ₄The emitter-base bandgap grading output signal through C ₁₂Be coupled to by BG ₅, R ₁₃, R ₁₄The low-frequency amplifier circuit (8) that constitutes.(8) collector electrode output signal is by coupling capacitance C ₁₃Send into by BG ₆, BG ₇, R ₁₅, R ₁₆, R ₁₇, R ₁₈, R ₁₉And R ₂₀The schmidt shaping circuit (9) that constitutes, the output signal of (9) is then passed through C ₁₄Be coupled into decoding circuit (10).Decoding circuit can adopt decoding integrated circuit IC ₂(HHy27), wherein 18 pin are supply pin, and 9 pin are grounding leg, and 1～8 pin is predefined address code.The OPADD coded signal of schmidt shaping circuit is imported R by 7 pin ₁₃For oscillation resistance is connected between 15 pin and 16 pin, the output signal of 10～14 pin inserts the input of the decoding drive circuit (11) of next stage, and 17 pin then insert sound circuit (13).Sound circuit (13) can ring integrated circuit (IC) by news ₅(as NE555) constitutes with piezoelectric loudspeaker.Decoder driver circuit (11) has adopted seven sections decoder ic IC ₃(as CC4511).Its 1 pin is the electric current pin, and 7 pin are grounding leg, and 2～6 pin are input pin, and 8～14 pin then insert display circuit (12).Display circuit (12) can adopt charactron IC ₄With IC ₃Output signal carry out numeral and show.In the present embodiment, the power supply of receiver and reflector is chosen as 6～9V.In acceptor circuit, be connected in series K switch equally.When K closed, charactron was shown as O, and the expression receiver is in running order, works as C ₁₀, B ₄When being tuned in the tranmitting frequency of emitter, receiver can receive signal and amplify and shaping, this signal enters decoding circuit and compares with the address code signal that sets in advance, as different decoding circuit no-outputs, if identical then decoding circuit output binary digital signal also drives the demonstration of charactron numeral, a positive pulse control of decoding circuit output simultaneously acoustics circuit makes sound horn.

The utility model is simple in structure, easy to use, the central station and the information desk that are worth costliness need be set in certain scope, carry out radio-paging, extremely be fit to public service place among a small circle such as dining room, hospital, hotel, restaurant, bar, dance hall, have very strong market development potential.

Claims (4)

1, a kind of short-distance wireless beeper is made of reflector and receiver, and reflector promotes circuit (3), power amplifier (4), radiating circuit (5) and transmitting antenna (6) cascade in regular turn by coding circuit (1), modulation oscillator circuit (2), power amplifier and constitutes; Receiver is made of Armstrong circuit (7), low-frequency amplifier circuit (8), decoding circuit (10), decoder driver circuit (11), display circuit (12) cascade in regular turn, on decoding circuit (10), can insert sound circuit (13), it is characterized in that in the described modulation oscillator circuit (2) output of coding circuit (1) and modulating oscillation triode BG ₁Base stage link to each other with collector electrode, the output of low-frequency amplifier circuit (8) links to each other with the input of schmidt shaping circuit (9), the output of schmidt shaping circuit (9) links to each other with the input of decoding circuit (10).

2, short-distance wireless beeper as claimed in claim 1, the base stage modulating input signal that it is characterized in that described modulation oscillator circuit (2) is by inserting BG ₁Base stage series connection divider resistance provide, the collector modulation input signal by with middle all B ₁The capacitor C of parallel connection of primary windings ₄Add B ₁Secondary output signal then as the input signal of back level work circuit.

3, short-distance wireless beeper as claimed in claim 1 is characterized in that the inductance coil L that connected between described coding circuit (1) and the modulation oscillator circuit (2) ₁

4, short-distance wireless beeper as claimed in claim 1 is characterized in that described transmitting antenna (6) can adopt helical antenna.

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