Re: Interference identification?
Posted: Tue Mar 14, 2017 8:29 am
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 such pulsing. Funny is that the odd and even carriers swap pulsing. It is difficult to 100 % identitfy such an interference without direction finding. There are so many possible sources. But, even when you found the source of the interference it is not guaranteed that you get rid of it. The neighbours normally are stubborn, the national spectrum supervisors do not care and often the noise is within legal limits.
The "photovoltaic" neighbour BTW kicked me out of the house after trying to talk in friendship with him and the authorities cancelled processing before they talked to the neighbour, telling me they had "more important work to do". I should clear the issue with the neighbour myself. The interference is now here for 3 years. No chance to ged rid of it.
And I fully agree with you: Purchasing new equipment like receivers, SDRs or whatever, is totally throwing money out of the window. I once critized the maker of the Elad receivers for doing nothing against PLC interference. After all it spoils his business. He told me that he is a member of a committee against electromagnetic pollution together with other receiver manufacturers. He said word by word: "You cannot imagine how powerful the lobby of the PLC manufacturers is."
PS: I have found the image of the photovoltaic inverter noise which I also showed the spectrum staff (arrows). I marked "Radio 700" because it is important that a radio station is jammed by the noise. Without this premises the staff would not have processed the case at all. The interference is also present in the ham bands. But the authorities were not interested in this at all. They stopped processing the case because of "other, more important appointments".
73, Heinrich
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 such pulsing. Funny is that the odd and even carriers swap pulsing. It is difficult to 100 % identitfy such an interference without direction finding. There are so many possible sources. But, even when you found the source of the interference it is not guaranteed that you get rid of it. The neighbours normally are stubborn, the national spectrum supervisors do not care and often the noise is within legal limits.
The "photovoltaic" neighbour BTW kicked me out of the house after trying to talk in friendship with him and the authorities cancelled processing before they talked to the neighbour, telling me they had "more important work to do". I should clear the issue with the neighbour myself. The interference is now here for 3 years. No chance to ged rid of it.
And I fully agree with you: Purchasing new equipment like receivers, SDRs or whatever, is totally throwing money out of the window. I once critized the maker of the Elad receivers for doing nothing against PLC interference. After all it spoils his business. He told me that he is a member of a committee against electromagnetic pollution together with other receiver manufacturers. He said word by word: "You cannot imagine how powerful the lobby of the PLC manufacturers is."
PS: I have found the image of the photovoltaic inverter noise which I also showed the spectrum staff (arrows). I marked "Radio 700" because it is important that a radio station is jammed by the noise. Without this premises the staff would not have processed the case at all. The interference is also present in the ham bands. But the authorities were not interested in this at all. They stopped processing the case because of "other, more important appointments".
73, Heinrich