Be careful when connecting coax SMA connectors. It's possible to physically hook up a pair of connectors that fit perfectly but have no connection for the center part of the cable.
Be sure and check if you're using SMA or RP-SMA (RP = reverse polarity) connectors when hooking things together.
Here's an adapter to switch between the two.
blogodex = {"toc" : "Connector Mania", "idx" : "SMA"};