Using the RigExpert AA-3000 Zoom, we test 11 connectors three of them are new. The other eight are old, silver plated, tarnished connectors.
7x PL-259
3x N Type Adapters
Unbelievably low loss even at 1.69GHz
...
https://www.youtube.com/watch?v=S8ZjIDHzj1E