So here I tried to color on this to show better.
This is just a broad example of how this might happen:
In the plot below the y-axis is power and the x-axis is frequency
The altimeter is not going to have any bandwidth, it’s a single frequency, so it will be a signal line. I drew the green line to represent an altimeter frequency.
5G has bandwidth, you will even hear them talk about it in the commercials. The red line represents the band that the 5G would cover. Even though the claimed bandwidth is only from f1 to f2, the signal still has power outside the band (the tapering red line to the left of f1 and right of f2)
So even though the altimeter frequency is outside the 5G bandwidth, it is still partially covered up by some of the taper from the broadband 5G transmission
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