2020 - 2020
Most of what there is to say has already been detailed by others
The HM stands for "hybrid mode" as preceding digital data is voice. This station can be heard pretty much anywhere, though I've noted northwest USA in particular gets great reception. it's not uncommon for HM01 to have errors in broadcast.
Found this right next to an S06s transmission i was tuned to. AM mode, with carrier.
This one had broadcasted on two frequencies
i've heard X06b two times, however the transmissions both ended too soon. X06c lasts for many hours.