Hello all, pardon the newbie question but …
I have been monitoring the High Frequency transoceanic position reports, etc. between enroute aircraft and what I presume is New York Center. I will catch the flight number and then pull the flight up on the map. I’m one of those hams who listen 100X more than I ever transmit so it’s been enjoyable.
My question is this, what are the two tones that the center transmits after the flight checks in? Sounds to me more like an old two tone Plectron rather than a data burst or anything.