CN108271100A

CN108271100A - UHF receiver height puts channel floor and makes an uproar the raising method of gain

Info

Publication number: CN108271100A
Application number: CN201711329559.9A
Authority: CN
Inventors: 胡跃进
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-12-13
Filing date: 2017-12-13
Publication date: 2018-07-10

Abstract

Channel floor is put the invention discloses a kind of UHF receivers height to make an uproar the raising method of gain, and the load line of UHF wireless microphone bandpass amplifiers is less than or equal to 47nH by conventional around inductance value, is increased to more than or equal to 220nH.By microphone in weak signal, it is just controlled in the critical value as threshold values by the use of bottom amplitude of making an uproar, and slightly below threshold values, small signal is used, the use transmission range of UHF wireless microphones is substantially increased in appropriate purposes, expands the application field of more audio wireless transmissions.

Description

UHF receiver height puts channel floor and makes an uproar the raising method of gain

Technical field

The invention belongs to UHF wireless microphone very-long-range transmission technique fields, more specifically more particularly to a kind of UHF Receiver height puts channel floor and makes an uproar the raising method of gain.

Background technology

Wireless microphone, if being by the pocket transmitter of cadre（It can be mounted in pocket, output power about 0.01W）With a collection Middle receiver composition, respectively there are one mutually different working frequencies for every pocket transmitter, concentrate receiver that can receive simultaneously The voice signal of different operating frequency that each pocket transmitter in portion is sent out.It is adapted to the occasions such as stage dais.

It is a kind of harmful snow noise that the bottom of UHF wireless microphone bandpass amplifiers, which is made an uproar, improve channel gain it is same When, the gain that signal and bottom are made an uproar is enhanced simultaneously, influences the quality and transmission range of microphone communication, solves the side of transmission range Method is also varied, but equipment is numerous and diverse, and relative cost is higher, and transmission range is still limited；It is of high cost, it is unfavorable for terminal User's purchase is promoted the use of.

Invention content

Channel floor is put the purpose of the present invention is to provide a kind of UHF receivers height to make an uproar the raising method of gain, in solution State the problem of being proposed in background technology.

To achieve the above object, the present invention provides following technical solution：

A kind of UHF receivers height puts channel floor and makes an uproar the raising method of gain, by the load line of UHF wireless microphone bandpass amplifiers 47nH is less than or equal to by conventional around inductance value, is increased to more than or equal to 220nH.

Preferably, the gain of making an uproar of UHF signal amplifiers bottom is improved to 8-12dB, reduces the threshold values loss of signal.

The present invention also provides a kind of UHF receivers height channel floor is put to make an uproar the circuit of gain, including capacitance C41, inductance L5, One end connection output terminal out, inductance L5 of one end connection input terminal in, the capacitance C55 of capacitance C55, the capacitance C41 and Output terminal after capacitance C55 parallel connections connect BF998R with the other end of capacitance C41, the BF998R be also electrically connected R1, R2 and C2, and R1 and inductance L5 add in the bias voltage of 9V, wherein R1 is 100k, and R2 100k, C2 102p, C41 are 100p, L5 0.22uH, C55 10p.

Compared with prior art, the beneficial effects of the invention are as follows：By microphone in weak signal, made an uproar width the bottom of using Degree is just controlled in the critical value as threshold values, and slightly below threshold values so that small signal can be used, appropriate The use transmission range of UHF wireless microphones is substantially increased in purposes, expands the application field of more audio wireless transmissions.

Description of the drawings

Fig. 1 is the circuit diagram of the present invention.

Specific embodiment

In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with specific embodiment, to this Invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not For limiting the present invention.

A kind of UHF receivers height puts channel floor and makes an uproar the raising method of gain, by the negative of UHF wireless microphone bandpass amplifiers It carries line and 47nH is less than or equal to by conventional around inductance value, increase to more than or equal to 220nH.

Specifically, improving the gain of making an uproar of UHF signal amplifiers bottom to 8-12dB, reduce the threshold values loss of signal.

By the load for increasing UHF wireless microphone bandpass amplifiers so that UHF signal amplifiers bottom amplification factor of making an uproar carries To required amplitude, make an uproar height gain about 10dB or so at bottom, reduces the threshold values loss of signal, improves the sensitivity of signal.

While improving the gain of channel, the gain that signal and bottom are made an uproar is enhanced simultaneously, in weak signal, utilizes bottom Amplitude of making an uproar just is controlled in the critical value as threshold values, and slightly below threshold values so that small signal can be used, suitable When purposes on substantially increase the use transmission ranges of UHF wireless microphones.

The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.

Claims

It makes an uproar the raising method of gain 1. a kind of UHF receivers height puts channel floor, it is characterised in that：By UHF wireless microphone band logicals The load line of amplifier is less than or equal to 47nH around inductance value by conventional, increases to more than or equal to 220nH.
It makes an uproar the raising method of gain 2. a kind of UHF receivers height according to claim 1 puts channel floor, it is characterised in that： The gain of making an uproar of UHF signal amplifiers bottom is improved to 8-12dB, reduces the threshold values loss of signal.
It makes an uproar the circuit of gain 3. a kind of UHF receivers height according to claim 1 puts channel floor, including capacitance C41, inductance L5, capacitance C55, it is characterised in that：One end connection output of one end connection the input terminal in, the capacitance C55 of the capacitance C41 Out is held, the output terminal after inductance L5 and capacitance C55 parallel connections connect BF998R with the other end of capacitance C41, and the BF998R also divides Not electricity Xing Lianjie R1, R2 and C2, and R1 and inductance L5 add in the bias voltage of 9V, and wherein R1 is 100k, and R2 100k, C2 are 102p, C41 100p, L5 0.22uH, C55 10p.