I was listening to EAM's, just tuned to 6739 USB and was waiting with the volume low, I heard one then about 5 minutes later I hear some spanish language conversation on the same frequency, I am still hearing it as I type this, it can't be too far away as I am only using the whip antenna and I am in SC, aren't the military channels reserved for just their use? I am just curious .
Hey, it's cool you heard some EAMs & apparently know what they are, but no, HF frequencies aren't really 'reserved' worldwide for one particular user, and especially with some military stuff, the US Gov't isn't going to tell the rest of the world "Hey, here is an exact list of all the HF freqs we want to use -- please stay off them." But HF spectrum is supposed to be coordinated, so for example, most of the stuff you should hear in the 6.7MHz spectrum should in theory be military (US & foreign). What you heard in Spanish on the same freq could have pretty much been anyone -- Mexican military using the channel tactically, some Nicaraguan guy on his fishing boat talking to his wife at their house near Managua, etc. Because it is a major channel used by the US High Frequency Global Communications System, chances are no one else would want to use that freq a lot for their own comms, since they'd probably receive co-channel interference from the US & allied military stations on that same freq.
Also, just because you're able to hear something, even with a strong signal, using your receiver's whip antenna, it doesn't mean that the transmitter you were hearing isn't 1000+ miles away, though it can depend on your local time (basic propagation).
