I think the fact that they are closely spaced in frequency and synchronised with each other, suggests to me that they are a local interference source.
I have seen many similar signals, and they often originate from PC's, or other devices using microcontrollers. The sequences often vary depending upon what processes are in use, variation with hard disk access is often the easiest one to spot.
Comments
Seems to be across much of the HF Band
Well it must be something local, as another Kiwi not far from me isn't receiving them.
I think the fact that they are closely spaced in frequency and synchronised with each other, suggests to me that they are a local interference source.
I have seen many similar signals, and they often originate from PC's, or other devices using microcontrollers. The sequences often vary depending upon what processes are in use, variation with hard disk access is often the easiest one to spot.
Regards,
Martin
The only computer near it is a mac mini (M2) in a room at the rear of the garage, and in the garage is my proxmox cluster.
Interesting that this is quite new and all the other devices have been in the garage for some time.
The cabinets are all earthed and the kiwi is also in an earthed metal box.
I shall keep investigating.
If it is something like a PC, and it's not on your property, it could still be in an adjacent one.
However, as modern electronics pop up just about everywhere, this is still just a guess.
You may have to build a small tuned loop and go "hunting", by means of triangulation.
Good luck,
Martin