I am attempting to hunt down many sources of RFI in and near the UHF amateur bands at my home, but I stumbled across a very specific one that I have definitely never heard before. This one sounds less like interference and more like an intentional signal of some kind. I have listened to every type of UHF signal on the http://www.sigidwiki.com and none of them line up with what I am hearing here. I set my SDR mode to LSB so that the audio would be easily discernible.
I first discovered this with my Yaesu FT-60R in AM mode on 446MHz out in the yard ~100ft from my house. I pulled it up on the SDR to easily record the signal for posting here.
I have also recorded audio of the signal in hopes it will help someone to help me ID this signal.
If audio recordings are not allowed on this site, please forgive me. I am very new to this!
So I guess my real question is.. is this RFI, or is this an intentional signal? If intentional, I'm curious what it is. If RFI, then I need to go digging through my house trying to find the source.
EDIT: Apologies, I forgot to mention. I am located in the US (NE Florida) and 446MHz is allocated as the national 70cm calling frequency.
EDIT2: Here is a wider view of the spectrum around 446MHz. It appears that there is a constant spike around 445.993MHz, and then on each side there are numerous "copies" of the signal dancing back and forth that you can see in the waterfall. It seems that certain ones are dancing "backwards" from the others, as if the signal in certain spots is inverted. I officially have no idea.