Double check that the N connectors are 50 Ohm and not 75 Ohm - The 75 Ohm version has a thinner pin and may not connect properly if you plug it into a 50 Ohms socket.
The top ones are 75 Ohm, the bottom 50.
Double check that the N connectors are 50 Ohm and not 75 Ohm - The 75 Ohm version has a thinner pin and may not connect properly if you plug it into a 50 Ohms socket.