I tried fitting a range extender to my controller - a nice directional signal for when there's a lot of radio noise around.

The extender didn't work, and so when I put back the original antennas, I found the 5.8GHz signal was showing as 1 red bar. The two for the WiFi/video signal where fine.

Somehow - either static, or some damage I've done to the board that I can't see (I work with electronics, so I thought this would be easy)... has caused the transmitter to drop to 1 bar.

What would be the cost be to repair this? Does anyone know?

I found out what's wrong.    When the battery was disconnected - the frequency it was set to was forgotten, and the controller needed re-pairing with the quad copter. There's nothing actually wrong with the 5.8GHz transmitter. Phew!

Hello and good day. Thank you for the given update and it is great to know that the issue has been fixed. If you have any other inquiries or concerns with DJI. Please feel free to post it here at DJI Forum. Have a safe and happy flying always.

DJI Stephen Posted at 4-22 07:49
Hello and good day. Thank you for the given update and it is great to know that the issue has been fixed. If you have any other inquiries or concerns with DJI. Please feel free to post it here at DJI Forum. Have a safe and happy flying always.

Thank you for your offer of support.

djiuser_2rxKS3JfbwAm Posted at 4-23 00:29
Thank you for your offer of support.

You are very much welcome and thank you for choosing DJI.