Digital Spectrum
Posted on Saturday, December 26, 2009 in Photography
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Where do Digital wireless signals fit into the E.M. Spectrum?
Im familiar with AM & FM modulation and how the signals have a wavelength/ freq. in the electromagnetic spectrum.
Where do digital transmissions fit into the spectrum? Im somewhat familiar with "Pulse"WidthModulation and squarewaves. Where do the "Pulses" in pwm fit into the spectrum. Does UHF, VHF, HF... have any relevence in wireless digital.
they can fit in anywhere they are put. AM, FM, and PWM are ways of encoding information that is transmitted. UHF, VHF, ULF etc, are different types of carrier frequencies. that being said, all ways of encoding can be used on all types of carrier frequencies. Ethernet and cdma are also ways of encoding info. ethernet was originally used with a copper medium for tranmition and CDMA was used for broadcast tranmition. now both can be transmittied through either air, copper, fiber media, ect.
if you would like to do a little research look up: CMDA, PCS and GSM for examples of digital encoding. also look up the ISO's seven layers of a program. your question deals with (i think) network layer 3 (digital question) and layer one (physical transmition). each layer is said to be transparent to the others so when the data is encoded, the system encoding the data doesnt change the encoding to fit the physical layer in any way. it is worth noting that this response will reach you via a digital signal with a carrier of 2.4GHz using IEEE 802.11G for encoding (wireless router).
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