Searching for how to complete the FrSky QX7 Crossfire mod? Well check out the video submitted by James, AKA RidiFPV via the GetFPV Community Program to help guide you through the installation!
You can check out more of RidiFPV’s content at his YouTube.
Disclaimer: This video was produced solely by a member of the FPV Community. Views and advice in this video are that of the creator and does not necessarily reflect the opinion or views of GetFPV.
Step by Step Guide
Step 1: Pull the battery cover off of the transmitter and remove battery.
Step 2: Remove the four Philips head screws holding the housing together. They are located at the top corners of the transmitter and in the bottom corners of the battery bay. (Set these aside in a safe place)
Step 3: Remove the eight screws on the bottom PCB to free it from the transmitter housing.
Step 4: Locate and carefully desolder and remove the Q400 transistor and solder one wire to the single side pad of where the transistor once was.
Step 5: Add some double sided tape to the location where you wish the mod to live.
Step 6: Solder the ground and power to the pads of the capacitor located to the bottom left of the processor. Make sure you solder directly to the capacitor pads, and not to the single pads on either side of it.
Step 7: Solder your remaining wire to the input pin header (left-most header).
Step 8: Solder all wires to the inverter mod. Wire from Q400 goes to OUT, wire from the pin header goes to IN, and the wires from the capacitor go to GND (left side of the capacitor) and 3.3V (right side of the capacitor) respectively.
Step 9: Replace all screws and close up the radio! Your FrSky QX7 Crossfire mod is complete!