The spikes occur on both an RS1D and a RBoom at the same location, but in different rooms. In both cases, the spikes appear on the record from FDSN, but not in the files. To me, this says it is not the instrument, but the transmission to the server or the server itself that is generating the spikes.
Our internet connection is ADSL running on an aged copper-lines system that we’ve had numerous problems with. The lines company is loath to do anything about it because new technology is coming… But perhaps this is the problem? How could I check this?
Having said that, we stream video content all the time and have no problems with that, but perhaps that’s more forgiving than transmitting data?