Strange loss of a 40 GHz cable

[giorgi3092]

I am trying to measure the loss of this particular cable I have - HLL150-29P-29P-36

The cable is supposed to work until 40 GHz, but measuring it port 1 to port 2 on my VNA - PNA-X N5247A, I see extremely ripply behavior in S21.

It is strange because the datasheet has some S21 plots and S21 is contained better than -2.5 dB.

I am trying to figure out what I am doing wrong. I am attaching front panel jumper connections, is my setup correct? I am new to this VNA, so I might have set up something wrong.
There is nothing particular about the VNA setup. It's our normal DC-67 GHz setup. I am just feeding 0 dBm from port power and received power (B) is the same as S21 basically. So, what is going on? Why is my cable loss so bad?

 

[dick_freebird]

Bad termination or a gross discontinuity somewhere along the cable, like from damage?

Have another to compare?

 

[giorgi3092]

never mind folks, it was one of the jumpers on the left with loose connectors.

 

[vfone]

Even you say that the problem was solved, I wonder how did you calibrate the VNA for S21 measurement, when actually you connect the blue coax cable directly on the VNA ports (without using the VNA test cables), so the reference plane for S21 is at VNA ports level.