I believe this is a 6928.5 kHz ISB transmission of Link 11 out of Europe or that general region.
T!
what is link 11 is it military or general com's, also what is ISB' I dont understand.
Nova
Link-11 is military. Link-11 is a tactical data link that allows one platform (ship, aircraft, submarine, etc) to share its tactical picture with any other platforms in the network. If one ship in a task group sees a target on its radar (sonar, passive sensors, etc) that track data is passed out to everyone, so everyone can see that track, even if their radar or other sensors cannot actually see the target. There are many advantages to such a system, but one might be that of 12 ships in a task group only one has its radar turned on, providing a radar picture to everyone while the other 11 ships do not give away their position or condition by their radar emissions.
Link-11 was developed for the US Navy, but it has become a NATO forces standard. It is in the process of being replaced by Link-22. As Link-22 is backwards compatible to Link-11, this signal might actually be Link-22 in a Link-11 mode.
ISB is Independent SideBand. This is sending both USB and LSB at the same time, but potentially with different data in each sideband, doubling the data rate. Or, alternately, a single frequency can support two different Link-11 networks, with some platforms in both networks, and some in either or.
T!