Wireless Phone for Car/ Bluetooth Handsfree

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Wireless Phone for Car/ Bluetooth Handsfree

Q: After changing the fiber, the caller's Caller ID is gone. Who knows which brand of cordless phones support fiber?: Your problem may be conceptually wrong, and the civilian phone does not support the direct insertion of fiber optic telephone terminals. Only fiber optic telephones are available for optical fiber construction.

Q: Which brand is the furthest distance to use?: The digital cordless phone has a signal display. As long as there is a signal, it is OK to use it. The digital signal is very stable. I suggest you buy German Gigaset, formerly known as SIEMENS cordless telephone, the quality is guaranteed, durable, after-sales service is also convenient, national unprofor.

Q: Why cordless phones are made from NiMH batteries instead of lithium batteries?: The lithium battery is more fragile, more not overcharge protection circuit and the use of off the shelf is also too simple (just off protection). Even with the protection of overcharge protection, voltage is too high (usually 4.3V or higher, as the last protection measures to be used), and the protection, need to reset is available, it is not suitable for use in here.The solution is to make use of TL431 DIY, a precise high performance regulator tube. Among them, Vref=2.5V, select R1=68k, R2=100k, you can do VKA=4.2V, and the characteristics of very steep. Before reaching 4.2V, the current is very small. Once it reaches 4.2V, it is stable at 4.2V. The excess current is absorbed by TL431, and the maximum absorption capacity is 100mA. The regulator is connected to the battery in parallel to ensure that the battery voltage is no more than 4.2V. Before the battery voltage reaches 4.2V, the circuit has no current flow, and all the current flows into the battery.

Q: How do cordless phones and WIFI interfere with each other?: Cordless phones and WIFI high frequency signals and low frequency signals are literally different frequencies. In wireless communications, a generally high frequency signal, or frequency band signal, is transmitted over the channel, while a modulated low-frequency signal, such as a speech signal, is called a baseband signal.

Q: Why don't cordless phones use telephone lines?: Cordless telephone can carry out, and can work with other random phone call each other cordless telephone is close by sending and receiving radio signals between fixed and mobile machine to machine communication voice, generally using narrowband FM crystal control work.

Q: 2.4G digital cordless telephone set. For home use, can I get it in Australia?: You put the machine get anywhere, as long as the connected telephone line, telephone to accessibility, because between landline and sub machine contact, and use the local telecommunications system does not conflict, so there is no technical obstacles, but you should pay attention to the machine itself the band used in 2.4000 - 2.4835GHz range. In China is legitimate, but in a foreign country, the local is open the corresponding frequency, not to say, each country is very strict on the radio management, this is not the distinction between socialism or capitalism, because the radio band is a strategic resource, can not be completely open, so the local radio management department you the best advice, if not, you were, on the personal credit information system will be a devastating blow, on their own is an accident.

Q: What is the difference between a digital cordless phone, a master slave machine and a telephone receiver?: Especially in terms of radiation, transmission power of 2 watts, most of the mobile phone frequency is 900 MHz, and is used in high frequency transmission; and cordless telephone with small power transmitting, microwave radiation produced almost negligible, will not have any impact on the human body. As a result, the popularity of digital cordless telephone is the trend of the times. As digital LCD TV, the elimination of analog CPT TV tube, analog TV, digital cordless telephone, the elimination of analog telephones has become a necessity

Q: Cordless phone call sound failure, ask you great God to answer: If it's not your phone problem, that's the problem with the telecommunications. They'll have to fix it.

Q: The working principle of the call between the master and slave computers of a cordless telephone: By sending radio waves over long distances, they complete the work of voice transmission that was originally performed by telephone lines, because radio encounters obstacles can be reflected or absorbed, so there is a certain range of use

Q: Will there be any interference between home cordless phones and wireless routers?: Routers and cordless phones are different in frequency and coding mode and will not have any impact. Even with the same brand of unlimited equipment together, there will be no impact, this need not worry. Cordless phone model is not clear, this thing is simple, look at the purchase of their own, as long as the work is not too bad, generally no problem.

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