I live in Seattle, and something weird is happening in the 33cm UHF ham band. The entire band is filled with very short pulses (10th of a second or less) of what look like FSK modulated signals (when viewed with a spectrogram). They are not all using the same tone separation. Some of the FSK pulses have up to 100kHz between the mark and space tones. It's like the entire band is fille with some kind of frequency hopping spread spectrum signal, where it's an FSK signal being hopped, and not only is the transmission frequency being hopped, but so is the separation between the mark and space tones. I'm using my AirSpy SDR to tune around, and it appears that this FHSS FSK signal fills the entire 33cm band. Anybody know what the name of this signal type is? It's certainly not standard RTTY.