How to fix Hubsan X4 transmiter

My Hubsan X4 (H107) had developed a problem synchronizing with transmitter (tx to rx). Since I had to disassemble it completely and solder broken battery cable I wasn’t optimistic that I could fix it. But I knew the quadcopter was flying after my repairs, so I kept thinking that the problem may lay somewhere else.

I suspected the transmitter. Symptoms below were appearing in random order:
* Hubsan X4 established link to transmitter (LEDs on), but does not react to throttle
* Link is established, but drops immediately – LEDs flashing on quad-copter or LED flashing on transmitter
* Red LED flashing quickly on the transmitter

I tried all the usual IT magic: turn it off and on again, shake, press all buttons in random order and combinations etc. with no result. I tried to do the factory reset and recalibration – the transmitter did not respond to that. I needed to think outside of the box. And then it hit me!

The solution was (drumroll…) to change the batteries in transmitter.

The Hubsan X4 transmitter has a battery status build in, but it seems to be broken – it was showing more the batteries still have 3/5 of the juice while the batteries were clearly dead.

Facepalm

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How to start flying quadcopters

It has been almost six weeks since I started flying quadcopters (see early results here: ). There’s a lot I learned so far:
* it’s physics baby! bringing the controller stick back does not slow down/stop the machine – it changes the force generated by propellers, so the quadcoper will keep moving for a while and ultimately it will accelerate.
* using cheaper and smaller quadcoper helps. Risking crashing $500 isn’t a nice feeling. Nor it the feeling that you can hurt someone.
* flying quadcopters is harder than driving cars.
* it’s worth joining a club – for guidance and insurance
* buying a lot of spare parts make the flying more interesting. Having 4 batteries gives you enough time to have some fun and having spare propellers mitigate the fear of crashing
* it’s addictive, it’s fun
* you will crash

I highly recommend a Hubsan X4. It’s relatively easy to fly and very durable. Mine has survived tens of crashes and other abuse. The set of propellers costs 1.5 GBP and you can get spare batteries for around 3GBP. And it looks really nice ;)

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