Take a look at the picture below showing all the spikes in the QLN for my line #4, compared with the other lines, in which almost all are absent:
How can the pictures be different? The lines run along the same route, with the slight exception of line 2 which is not an EO line, so we believe?
Any idea if these are radio stations or some such and if so what?
The bits per bin graph for line 4 indicates that the spikes above tone 170 don’t matter anyway because zero bits are allocated to those higher bins.
Line 4:
![](https://i.postimg.cc/4dDMYq4c/B055-F537-E47-E-4619-9-F42-FDEE6-B6205-CC.png)
And for comparison:
Line 1:
![](https://i.postimg.cc/FFcWzTMy/D3667-B98-C331-4-BE6-8235-7-AD632272-E3-A.png)
Line 2:
![](https://i.postimg.cc/X7CjD6BR/89-C9-DF1-D-BFF0-469-F-81-CC-51151-D51047-F.png)
Line 3:
![](https://i.postimg.cc/XJdLzJ3Z/733184-BE-A9-B0-4-BD3-B390-87-A3245-E30-D7.png)
Bits per bin for
line 4:
![](https://i.postimg.cc/KcHTXbqQ/E0-D94-B7-E-C83-C-4-F11-88-A7-AA03-ABDA3-C45.png)