Keyless entry system

While working on a keyless entry system I tried different methods to capture the signal from the antena located within the door handle.

One was with the Pico TA 330, a dedicated probe for this specific purpose. Another intent was made with an inductive ckp and then finally I looped a standard test lead a couple of times around the door handle.

All methods produced meaningful signals.... could you tell which probe is which just based on the picture?

Cool stuff!
I would imagine the dedicated tool produces the best signal, so I'm saying the blue trace is the Pico TA 330
The red trace appears to have a higher amplitude, so I'm going to guess that's the CKP
And that leaves the green trace to be the lead wrapped around the door handle.

Noah, thank you for taking the time to read and comment.

Your right on spot with the dedicated probe: The TA 330 is the blue channel.

Surprisingly the coiled standard lead resulted in a huge signal amplitude, definitely goes with the number of loops. Have a look at the v/div , it's more than twice compared to the TA 330.… so the red trace (channel 2) is the standard lead wrapped around the door handle.

The CKP sensor then is the third channel with the green trace. The signal amplitude is really small, a couple of hundreds mV. I noticed that the presence of the CKP would amplify 2 or even 3 times the signal of the TA 330 compared to the signal it produced whithout the CKP close.