General > General Technical Chat
Has anyone seen this - Voltserver: "Digital Electricity"
John Heath:
--- Quote from: NiHaoMike on February 17, 2018, 07:34:22 am ---I don't see having a single collision domain for a large building as a good idea. The probably of a collision goes way up with a large number of nodes and bandwidth goes way down. The transformers attenuating the signal can be used as a feature to have separate collision domains on each segment.
--- End quote ---
There are times when it is hard to penetrate a building with 2.4 GHz from the outside. I my case it is to WIFI a LED sign that is outside the building. From what you said there could be a chance to cheat by having the WIFI antenna very close to the sign power lines from inside the sign. Some of the RF should be coupled into the hydro lines? I could mount the other WIFI inside the building in the electrician's room to pick up a tiny bit of 2.4 GHz from the sign. Even with all the inherent hydro shielding the plastic breakers are plastic so some WIFI should leak out. Copper wire has to be better than fresh air. Maybe there would be just enough RF left for a reasonable WIFI connection??
NiHaoMike:
--- Quote from: John Heath on February 17, 2018, 03:19:03 pm ---There are times when it is hard to penetrate a building with 2.4 GHz from the outside. I my case it is to WIFI a LED sign that is outside the building. From what you said there could be a chance to cheat by having the WIFI antenna very close to the sign power lines from inside the sign. Some of the RF should be coupled into the hydro lines? I could mount the other WIFI inside the building in the electrician's room to pick up a tiny bit of 2.4 GHz from the sign. Even with all the inherent hydro shielding the plastic breakers are plastic so some WIFI should leak out. Copper wire has to be better than fresh air. Maybe there would be just enough RF left for a reasonable WIFI connection??
--- End quote ---
I think the dielectric loss is the factor at work. Homeplug auto selects frequencies between 2MHz and 100MHz or so, using whatever gives an acceptable SNR.
ogden:
--- Quote from: StillTrying on February 17, 2018, 11:55:54 am ---"It's power delivery in packets, not data."
How do you send power in packets. It's just a fancy name for a remote on/off switch. ie. cobblers. :-DD
--- End quote ---
You are mistaken indeed. Please confirm that earth is flat so I can skip explanation why it is not just remote on/off switch.
Cyberdragon:
--- Quote from: ogden on February 17, 2018, 06:16:18 pm ---
--- Quote from: StillTrying on February 17, 2018, 11:55:54 am ---"It's power delivery in packets, not data."
How do you send power in packets. It's just a fancy name for a remote on/off switch. ie. cobblers. :-DD
--- End quote ---
You are mistaken indeed. Please confirm that earth is flat so I can skip explanation why it is not just remote on/off switch.
--- End quote ---
We know exactly what you are saying. The question is do you?
Lets review the definition of the word "PACKET"
https://en.m.wikipedia.org/wiki/Network_packet
If you are "packetizing the power" itself, you are BY DEFINITION sending it in PULSES. Which brings us back to my original point that you will need CAPACITORS to convert this into clean DC power for a device to operate. Let alone the physics of why this is more complicated than normal rectifier ripple filtering.
https://en.m.wikipedia.org/wiki/Filter_capacitor
Why would you pulse the power? This is totally pointless! :palm: What purpose would anyone have to overcomplicate things?
If it's also modulating the pulses to communicate, then WHY? What possible data would a device need to communicate to it's power source? Control data? That's what POE is for! You can also impose the data OVER the power without ever pulsing the power itself!
You've yet to give us any specific examples of any specific uses, let alone advanges, of this! Sure you can regurgitate their marketing wank, but again, prove why this is not inferior to existing tech! You've beaten around the bush so much you've killed it!
Untill you do (give us examples and advantages), this crap is going under STUPID, and SNAKE OIL!
NiHaoMike:
--- Quote from: Cyberdragon on February 17, 2018, 07:42:08 pm ---Why would you pulse the power? This is totally pointless! :palm: What purpose would anyone have to overcomplicate things?
--- End quote ---
It does solve the main problem of HVDC - the tendency of it to arc. Sending data in only the gaps isn't a particularly good use of bandwidth, however. Maybe I need to do a remake of that HVP70 test setup to show that Homeplug also works over HVDC...
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