Power Line Commucation Help Find Info

[ECET0purdue]

hello,
  I have searched but can not find a site that tells how PowerLine Commucation works....yes i know i spelled commucation wrong but google fixes it... i found one long time ago and was just hopeing someone could help
Thanks,
glen

 

[Staigen1]

Hi Glen

Did you? I tried to YAHOO it and got 62000 hits, but of course, i spelled communication right ;D

But i did know how household slow data communications worked already .
Its like this, usally. A high frequency is superinposed on the AC line. This frequency is usally in the range 40 Khz to 200 Khz. This frequency is then usally FSK modulated by the data transmitted. At the reciever end then this frequency is demodulated and data recovered. There is also other types of Powerline Communications! Example: Broadband data communications, analog communications, and so on.

//Staigen

 

[ECET0purdue]

That is what i was confused about... i understand how you get the lower freq. but i see people sending broadband over them.... how do they send it as a carrier signal when when the freq. is higher then the A/C?

do you khow what i mean?  if not i can explain better just would need my book for the terms

 

[audioguru2]

A pair of wires can carry many signals. The mains frequency and the high frequency carrier frequency.
One pair of wire carries all the sounds of an entire orchestra to your speaker.
One coax cable TV wire carries many channels to your TV. My cable TV coax cable even carries my high speed internet connection. ;D

 

[ECET0purdue]

is cable signal different then power lines.... were power lines have 60hz so how can you send broadband that is more then 60hz as a carrier?

 

[audioguru2]

The wires are only wires that can carry signals.
The 60Hz power doesn't know or care if you add broadband to the wire.
The broadband doesn't know or care if the wire also has 60Hz power.

When you receive it you just add a filter to the line to block the 60Hz but pass the broadband.

 

[elect1]

If, hipoteticly, milions of users are connected via BPL, would power voltage increse???

 

[audioguru2]

If, hipoteticly, milions of users are connected via BPL, would power voltage increse???

What is BPL? ???

 

[elect1]

Broadband over Power Lines. That is experimental project of implementation fast internet connection in existing home power lines. I think that is experementaly used in a contrey somewere in N America. Project haven't faund approbation of authoritys becouse interfere some radio amateur frequencies or somethink like that... I though that wos talk about that

 

[ECET0purdue]

yes it is... but if you had broadband over power lines would that not interfear  with the power signal?

 

[audioguru2]

I don't think the mains power signal cares about only 1V or less of high frequency broadband signal.

If millions of users had BPL then the voltage would drop a little, due to losses in the filters.

 

[ECET0purdue]

"modulating high-frequency radio waves "  What kind of modulation does it use?

 

[Staigen1]

Hi Glen

"modulating high-frequency radio waves "