Search found 198 matches

by DanubeBCL
Tue Mar 14, 2017 10:36 am
Forum: General
Topic: Interference identification?
Replies: 37
Views: 23093

Re: Interference identification?

Well, I really do not want to swing the hammer of Eurosceptics. But European standards have often undermined more practical local standards. E. g. in my PLC example the noise clearly offended the previous German regulations of electromagnetic conformity. But the "harmonised" European law r...
by DanubeBCL
Tue Mar 14, 2017 8:29 am
Forum: General
Topic: Interference identification?
Replies: 37
Views: 23093

Re: Interference identification?

I suspect harmonics of the charching dock of a lawn mow robot or a photovoltaic inverter. The harmonics of my eastern neighbour's lawn mowing robot are relatevily stable. Harmonics of TV, monitor power supplies often "wobble". The photovoltaic inverter of a neighbour 80 m away also shows s...
by DanubeBCL
Mon Mar 13, 2017 9:58 am
Forum: General
Topic: Interference identification?
Replies: 37
Views: 23093

Re: Interference identification?

Might be time that some rich man/woman complains at the Eropean court of human rights because of offending free access to broadcast listening and media. But even the German amateur radio club could not do anything against the latest German law about electromagnetic compliance from September 2016 whi...
by DanubeBCL
Mon Mar 13, 2017 8:32 am
Forum: General
Topic: Interference identification?
Replies: 37
Views: 23093

Re: Interference identification?

Are these PLC modems susceptible to any kind of interference that would make them inoperative? Partly. Transmitting with appr. 100...300 W on a ham band in the vicinity (appr. 20 m) of such PLC makes them inoperative. But they are very insensitive. They work with signals af around 175 mV and you ha...
by DanubeBCL
Sun Mar 12, 2017 4:03 pm
Forum: General
Topic: Interference identification?
Replies: 37
Views: 23093

Re: Interference identification?

Could it be a PLC/PLT modem? The ham notch of the 20 m band should be seen a bit clearer. And the waterfall lines should be interrupted rhythmically (unless the modem is in full streaming mode). See jpsa's examples! It could be, but then it is fortunately a weaker, more distance one. Have a look at...
by DanubeBCL
Sun Mar 12, 2017 12:47 pm
Forum: General
Topic: Interference identification?
Replies: 37
Views: 23093

Re: Interference identification?

Yes, PLC is the biggest jammer, but there are more: Switched power supplies, monitors, lcd and plasma tellies, lawn mowing robots, photovoltaic inverters, LED bulbs, "smart" (?) homes, VDSL spectrums, electric pasture fences, even welding devices in car service stations ... The chain is to...
by DanubeBCL
Sun Mar 12, 2017 12:15 pm
Forum: General
Topic: Interference identification?
Replies: 37
Views: 23093

Re: Interference identification?

If I understand well, jpsa posted an image of an idle modem, I am not yet sure. That depends on the distance to your neighbour, the infrastructure in his house (wire resonances and line attenuation, distance between his two PLC-wallplugs a.s.o). For me it is a modem in normal operation being a bit ...
by DanubeBCL
Sun Mar 12, 2017 9:38 am
Forum: General
Topic: Interference identification?
Replies: 37
Views: 23093

Re: Interference identification?

Yes, PLC is working with on demand modulation. That means that idle PLC modems indeed make less noise. When data is transferred the modulation changes amplitudes rhythmically from almoust null to full within milliseconds. This is an obstacle when you want to null-phase the interference with a noise ...
by DanubeBCL
Sat Mar 11, 2017 4:12 pm
Forum: General
Topic: Interference identification?
Replies: 37
Views: 23093

Re: Interference identification?

The only thing you can do is to talk friendly to your neighbour and explain your hobby to him. He can easily distribute the internet in his house with other technologies like LAN cable or WLAN repeaters not based on powerline. In my case all talks were useless. I have nine neighbours in the meantime...
by DanubeBCL
Sat Mar 11, 2017 12:32 pm
Forum: General
Topic: Interference identification?
Replies: 37
Views: 23093

Re: Interference identification?

PS: From the answers in this post I see that the knowledge about PLC seems to be not very widespreed among members of this communinty. This astounds me because such interferences are every day business in urban areas (mostly in Europe, but such modems are sold elsewhere was well). Here I post an exc...

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