What's the frequency gap required when two or more plcc (powerline carrier communication) equipment are interfaced to a transmission line using phase to phase coupling?
Third: Unfortunately I do not know the answer to your question, but that answer must depend in part on the base carrier frequency(ies) and on the type and level of modulation, as well as on the legal limitations of your locality. Give more detail, and you will be more likely to get a useful answer.
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Sorry I missed important parameter. ITU specified a carrier frequency band of 40KHZ to 500KHZ for plcc. the modulation is AM with single side band suppressed carrier. plcc is used for speech or data transmission between electrical substation over power transmission line. the channel bandwidth used is 4KHZ it can also be 8KHZ by using two channel.For e.g. for station A TX=200KHZ RX=186KHZ stationB RX=200KHZ TX=186KHZ. each plcc equipment has transmitter and receiver.
Again, I don't know the legalities, but it sounds like you already have your answer. 200-186=14kHz. Assuming that you are using the two-channel method, that leaves 14-8=6kHz for two gaps, or 3kHz per gap, which sounds quite reasonable. The response curve of your receiver then would ideally have a cutoff within 1.5kHz of the band edge.
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Frequency Gap Required 
Re: Frequency Gap Required
