Hello,
I run RD773 since around June. It is located in the cellar, the quietest place I found that I can equip with electricity and network. I purchased it readily assembled. Since installation, it has a feature of recording a spike signal every 15s. I can not map this to anything in the house, and I suspect that it is an artefact of the device itself. I was suspecting a software issue, so that I (against the recommendations in the tutorials) upgraded the OS, switched off every service that I thought might be unnecessary, until I had crippled the OS so much that I re-installed from the image from scratch, and since then left it as-is. Still having these spikes. When I move the device around in the house, the spikes remain. I found another RS with the same effect, R4186. This device is not owned by me, and I have no access to it. But it makes me believe that the issue is with the device, not with some strange 15s signal in my house.
What can I do to get rid of these 15s spikes?
Today, I took the S&B mobile, and went first to a sports ground ~300m away. Learning curve there: Even slight wind is too much, and kids playing basketball do not help either. Right now I am ~2km away, the S&B is well wind sheltered in a small monument standing on the ground, a farmer is making hay ~200m away and his tractor’s engine gives a signal in both EHZ and HDF. Via the mobile network, I can even feed to the station net. Almost all noise comes from cyclists that pass the place about 2m away, and the wind, but both are easy to distinguish. Overall, the place is less noisy than my cellar.
Here on the field, I at least at present do not have the 15s spikes. In the cellar, I did not have them always either, but most of the time. That can be hint that the spikes are real, but it is not an evidence. I might need to move around in my cellar to identify in which direction, to what neighbour, I might be able to locate the source. Or confirm that it is the device itself.
For comparision, I attach screenshots from my cellar (with the 15s spikes), from the field where I am right now (with tractor, and one cyclist, but without 15s), and the S&B in the little monument on the ground, to see where the “field” recordings have been taken, to illustrate the setup.
No question, one of my neighbours must be running a Thumper, and I need to watch out for Sandworms! Or, I am one myself.
Been running a Shake 3D for 3 years or so now, I’ve had my Mystery Signal on and off since then. Its most prevalent in the horizontal axis(s), but detectable in the Z-Axis as well. I’ll see a 5 minute duration signal that shows a freq. of 42 Hz or so and one at 43-44 Hz. The signal starts and stops cleanly, no build up or decay, the last days its been very active and on most times, but has historically been seen only at irregular intervals. My Station is usually fairly quiet in my area; passing cars, appliances, etc. I know and can see, but never figured out this one.
I ran the shake at ground level under the stair case tonight: No 15s spikes. I just returned it to what I thought is the quietest place in the cellar: 15s spikes. Whatever this 15s signal it seems to be real, weak and local to the cellar.
Quite the mysterious signal indeed, especially as it seems to disappear when you are outside the cellar.
I had a similar signal on one of my Shakes, which was related to my use of the Pi internal WiFi module. Stopped using that, and the spikes (which were as regular as yours) disappeared.
However, I see (from the logs, thank you for those!) that you are not using WiFi, so we can exclude that source.
If you have made other experiments (moving it to different places in the cellar, or other places in your home) let us know what you managed to find out!
