Why RF frequency uses 433 MHz?

Apparently not. See http://www.wpc.dot.gov.in/faq.asp#3 What are the license- free bands? 433 MHz is not listed there.

because is a industrial standard

No -- the RF in RFID means radio frequency, ~900 MHz maximum. The infrared spectrum ranges from 1 THz (= 1,000,000 MHz) and up -- a big difference in frequency.

' GSR 564 E ' is a certification required in India for low powered RF products that uses frequency band between 865-867 MHz.

Transmit RF frequency subtract to the Receive frequency

Yes, but it will be less efficient than one designed for FM.

Commercial AM broadcast uses frequencies between 550,000 Hz to 1,700,000 Hz. Commercial FM broadcast uses frequencies between 88 MHz to 108 MHz. (million Hz)

RF = "radio frequency"

We usually see low power (short range) devices used on 315 MHz. An example of an RF (radio frequency) gadget that operates here is a garage door opener. But while 315 MHz is an open frequency and can be use fairly freely, be cautious in your experiments on the band. Interference is a growing issue and mutual respect is a must for any real investigator who plies the waves in this band.

Rf means Radio frequency. Scroll down to related links and look at the "Electromagnetic spectrum".

Radio frequency energy causes a heating affect. You can get RF burns if you touch or get really close to a wire carrying RF energy. With powers below 100 watts and normal wire insulation, RF burns are extremely unlikely. Since RF currents flow in the surface of a conductor (your skin), an RF burn is not the same as a burn from a 100 Watt soldering iron (for example). If you position your antenna feeders and antennas out of reach of prying hands, you will be safe.

RF usually means radio frequency

RF is used as an abbreviation of "radio frequency".

Commonly used intermediate frequencies 110 kHz was used in Long wave broadcast receivers. [1] Analogue television receivers using system M: 41.25 MHz (audio) and 45.75 MHz (video). Note, the channel is flipped over in the conversion process in anintercarrier system, so the audio IF frequency is lower than the video IF frequency. Also, there is no audio local oscillator, the injected video carrier serves that purpose. Analogue television receivers using system B and similar systems: 33.4 MHz. for aural and 38.9 MHz. for visual signal. (The discussion about the frequency conversion is the same as in system M) FM radio receivers: 262 kHz, 455 kHz, 1.6 MHz, 5.5 MHz, 10.7 MHz, 10.8 MHz, 11.2 MHz, 11.7 MHz, 11.8 MHz, 21.4 MHz, 75 MHz and 98 MHz. In double-conversion superheterodyne receivers, a first intermediate frequency of 10.7 MHz is often used, followed by a second intermediate frequency of 470 kHz. There are triple conversion designs used in police scanner receivers, high-end communications receivers, and many point-to-point microwave systems. AM radio receivers: 450 kHz, 455 kHz, 460 kHz, 465 kHz, 470 kHz, 475 kHz, 480 kHz Satellite uplink-downlink equipment: 70 MHz, 950-1450 Downlink first IF Terrestrial microwave equipment: 250 MHz, 70 MHz or 75 MHz Radar: 30 MHz RF Test Equipment: 310.7 MHz, 160 MHz, 21.4 MHz

It is the radio frequency (RF).

The most common IF in consumer FM radios is 10.7 MHz. So, for the FM broadcast band of 88 - 108 MHz, the local oscillator frequency would be between 98.7 MHz and 118.7 MHz. It could just as well have been chosen to work on the low side of the RF. But that would have placed the LO between 77.3 MHz and 97.3 MHz. Any LO leakage from the radio could have played havoc with TVs in the house tuned to the old analog Channel 5 (76 - 82 MHz) or Channel 6 (82 - 88 MHz).

Commercial radio broadcasting ... plain old AM and FM, not TV or "satellite" radio ... is allocated the frequency bands of 550 KHz to 1650 KHz (AM), and 88 MHz to 108 MHz (FM), in the USA.

RF (Radio Frequency Coil) is a coil, which is designed to resonate at a frequency some where in the radio spectrum frequency. See L C Circuit Link Below.

RF means radio frequency or relativity low range of frequency microwaves however are into the top range of the spectrum or very hi frequency.

RF=Radio Frequency, a wave that is used to send data wirelessly

It depends on the context. In electronics, RF stands for Radio Frequency.

Radio Frequency Remote

Radio Frequency planning

LARGE or big refers to magnitudes of Radio Frequency RF

A microwave oven is called a 'microwave' because that is the type of radio wave it uses to induce heat. An RF wave with a frequency between 300 MHz and 300 GHz is considered a microwave. Microwave ovens typically operate around 1-2 GHz. It is always surprising as to why they are called micro waves when their frequency is in Giga range. Its because, their wavelength is in micron range.