Does low Current at High frequency signal degrade with poor termination

Hello

I have a transducer that outputs a 2nS wide pulse at 20mV, I terminate the output of the transducer via a 50R transmission line into an oscilloscope terminated in 50R

When the transmission coax is terminated at a short stub of 50R coax into a BNC connector at the oscilloscope, there is some ringing after the pulse

When the transmission line is terminated at a PCB SMA, then connected via a short length of coax to the oscilloscope the ringing gets worse

When the short length of coax is replaced for a long length of coax the ringing is shifted out to the right and reduces

My question is
Do you need a good lot of switching power to make a coax transmission line work well, and does poor termination not using proper termination effect the signal badly when you are using low current at high frequency

Hi Patrick,

Yes, poor termination affects the signal badly.

Considering signals are in nano to milliseconds, therefore a slight fluctuation caused of poor termination is enough to damage the signals transmitted.

Data and power should be separated to prevent interference caused by magnetic field.

Hope it helps.

Best,
Neil