RF Introduction

RF referred to the RF is RF current,which is a high frequency alternating electromagnetic change short.AC variation of less than 1000 times per second is called the low-frequency current,greater than 10,000 times called high-frequency current,while the RF is such a high-frequency current.Cable television systems is the use of radio frequency transmission mode.


In the electronic theory,the current flows through a conductor,a magnetic field around the conductor will; an alternating current through the conductor,the conductor will be formed around an alternating electromagnetic field,called electromagnetic waves.
When the electromagnetic wave frequencies below 100khz,will be absorbed by the surface electromagnetic wave,can not form an effective transmission,but the frequency of electromagnetic waves higher than 100khz,electromagnetic waves can propagate in the air,and the outer edge of the atmosphere reflected by the ionosphere,the formation of long-distance transmission capacity ,we have long-distance transmission of high-frequency electromagnetic waves known as radio frequency capabilities,the English abbreviation: RF.The power source (analog or digital) with the high-frequency current is modulated (AM or FM),formation of the RF signal transmitted to the air through the antenna; remote radio frequency signal receiving anti modulated,reduced to the power source,which a process known as radio transmission.

Wireless transmission development for nearly two hundred years,the formation of a large number of users and products group,however,due to the effects of climate change and surface obstacles,can not be transmitted perfect information.Modern humans invented a low-cost high-frequency transmission cable (RF cable),in pursuit of perfect information transmission quality,taking into account the existing wireless equipment,wireless cable transmission became popular.This concept produces a radio frequency transmission.
If your information source through the secondary modulation,with cable transmission to the peer,peer information using reverse modulation source reduction after application,no matter how low frequency,but also the RF transmission,if there is no counter-modulation modulation process,but will sources of information transmitted by cable to the peer directly,no matter how high frequency,are generally wired transmission.

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