The little MCX Connector not have a good varieties for give better reception antennas to cheap SDR dongles, this easy mod change to SMA give you a lot alternatives for try a better reception
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Step 1: What You Need?
You need: Desoldering tape, SMA connector for chassis and also iron and some rosin core solder
Step 2: Uninstall a MCX
Disassemble the unit and remove a old MCX conector, take care not overheat the pc board
Step 3: Solder the New Connector
Install a nes SMA connector, make strong joint to ground
Step 4: Make a Hole on Case
Mark and drill a hole to pass the new antenna terminal over case
Step 5: Reasemble and Test
Reasemble the unit and make test, all its done
Step 6: Ready, Only Enjoy
Now you can install a handy rubber antenna or external antenna via coax feed. Have a happy reception