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because is a industrial standard

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Q: Why is RF frequency 13.56 MHz for PECVD?
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Yes, but it will be less efficient than one designed for FM.


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What is the risk of rf radiation from an amateur radio transmitter 100 watts or less 1.8 mhz to 420 mhz?

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Is 315 MHz an open frequency and can anyone broadcast on it?

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.


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What frequencies falls in the range of RF waves used by commercial radio broadcastings stations?

The frequency that falls in the range of RF waves used by commercial radio broadcasting stations is 3 kHz to 300 GHz. This is the frequency of radio waves and the alternating currents that carry them.