This discussion focuses on the specification of electromagnetic signals, emphasizing the importance of wavelength and amplitude in wireless communication. It explains that different devices operate on distinct frequencies, which allows them to function without interference, even when transmitting simultaneously. The conversation highlights the evolution from analog modulation techniques, such as Amplitude Modulation (AM) and Frequency Modulation (FM), to modern digital modulation methods that efficiently utilize spectrum space. It concludes that contemporary wireless devices often share frequencies but employ unique digital codes to prevent cross-activation.
PREREQUISITESElectronics engineers, wireless communication specialists, and anyone interested in understanding the technical aspects of electromagnetic signal modulation and wireless device operation.
It is rare to use a single frequency (CW, or Carrier Wave) transmission because it does not carry any information (other than the fact that the transmitter is switched on). It is normal to 'Modulate' a Carrier Wave with information - such as TV signals, Sound signals or data. There are many different ways of modulating a CW to carry such information. Amplitude and Frequency Modulation were all that was available until quite recently but nowadays, it is much more efficient use of spectrum space to use digital modulation and there are a myriad systems for this.lundyjb said:I mean, what all can you modify in an electromagnetic wave? Wavelength and amplitude right? So, for example, why does my garage opener open my garage door and not my neighbor's? Does every single wireless device have its own specified wavelength that is just fractions of meter off from others?