FS-TM912 has revolutionized the way people experience RC, and now this radio transmitter can stand up to the top competitions.
AFHDS (automatic frequency hopping digital system), is developed by FLYSKY for all the Radio Control model lovers and is patented by FLYSKY at home. The system is specially developed for all the Radio control models, that offers super active and passive anti-jamming capabilities, very low power consumption and high receiver sensitivity. With extreme rigorous testing by engineers and studying the markets for years, FLYSKY AFHDS is now considered to be the one of the best systems available in the market.
2.4GHz is the standard of new generation radio system because it has a lot of advantages. Operating at 2.4 GHz puts the radio control out of the frequency range of any 'noise' generated by the other electronic components on your helicopter - such as the brushless motor, Electronic speed controller, Servos and any metal to metal noise - eliminating interference and glitching that can affect traditional frequency system.
channels: 9 channels TM912
model type: helicopter ,airplane, glider
RF power: less than 20db;
code type: PPM/PCM;
lcd type: 128*64 dot;
low voltage warning: yes;
DSC port: yes;
charger port: yes;
1x FS-TM912 Transmitter
Mostly works, some bugs/problems
Posted by Grant on Dec 16th 2016
[I wasn't going to bother reviewing this product, but UJToys sent me an e-mail asking me to, so here goes.]
First, the item title "FlySky FS-TM912 Digital 3 CH 2.4ghz TX & RX LCD Transmitter" is wrong. It's not a 3CH tx/rx. It's a USB HID device you plug into a PC's USB port and use to control a simulator or game.
Second, the product description and specifications are wrong. They claim it's a 2.4GHz 9ch AFHDS PPM/PCM transmitter with a 128x64 pixel LCD and requires eight AA batteries. It's not. It's a USB HID device you plug into a PC's USB port and use to control a simulator or game.
The pictures on the item's web page are correct.
The controller came packaged in a dirty, shopworn plain white box with "TM912" hand written on it. It comes, as pictured, with two generic DVD-R discs labeled in magic marker as "A" and "B". There are no instructions or documentation of any sort. The DVDs appear to contain a variety of RC flight simulators:
AeroFly Professional Deluxe
Virtual RC Racing
RealFlight G5 with crack
RealFlight G5.5 with crack
Two different copies of DirectX
I don't know if these are eval versions or pirated/cracked copies. They're all for Windows, and I don't have a Windows machine. Other reviewers at other sites have said the DVDs are useless. Don't know, don't care.
The controller itself is appears to be based on the hardware for a transmitter similar to the FS-TH9X, but with fewer switches and a slightly different switch/knob layout.
When plugged into Linux, it's is recognized as a USB HID input device with 5 analog channels and 4 switches.
The controller suffers from a number of bugs/problems:
1. One of the switch channels doesn't work. The toggle switch labeled "SWA" does nothing, and the value seen by the PC's HID subsystem for switch channel 0 never changes. I traced the signal from the switch to the I/O chip, and it's fine up to that point, so it's either a faulty I/O chip or a firmware bug.
2. One of the two "knob" potentiometers shows up as an analog channel, but the other shows up as a switch that's either 0 or 1.
3. The analog channels all have a dead spot in the center of the range. This is probably intentional and meant to hide from the user problems with noisy A/D converters, poor mechanical repeatability, backlash, etc. The dead spot is annoying, but it's small enough that it's tolerable. [I've seen cheaper USB sim controllers where the dead spot covered the center 1/3 of stick travel -- making them useless.] Half-way decent transmitters don't have dead spots.
4. The trim adjustments are implemented incorrectly. They move the dead spot. This is just plain wrong. You have to push one of the trim switches 5 or 6 times before the output at stick-center changes. Once you've got the stick-center point trimmed, the dead spot is now off to one side or the other. Instead of a steady output value at stick-center (which is the purpose of a dead-spot), the stick-center signal is now "live". Pushing the stick in either direction produces an immediate output change. But in _one_ direction if you keep pushing the stick, you hit the dead spot where the output stops changing until you push the stick past the dead spot. This renders the trim function useless.
5. One of the right-hand gimbals on my unit is sticky and doesn't move completely smoothly. I'll probably try disassembling it and applying some silicone lubricant.
6. Generally poor workmanship. When I took the back off to try to troubleshoot the non-working channel, the poor workmanship is apparent. The hand-soldered joints are poorly done: there are incompletely wetted joints, melted and burned insulation on wires and flux not cleaned from boards/joints. A couple of the wires had crimp marks where they had been pinched between housing components during assembly.
The lack of usable trim on the stick channels is the most annoying of the problems. I don't care about the dead switch, since none of the simulators I use need that many switches.
I don't like the dead spot in the middle of the stick travel, but it's tolerable. (It's particulary stupid having a dead spot at 50% throttle.)
That said, the only other choices for a USB controller are the cheaper 6-channel FS USB sim controller (which I'm sure is worse), some _really_ awful $12-$15 dollars ones on e-bay that have such huge dead spots they're useless, a used USB controller from a RealFlight user, or a converter cable with a real transmitter (which is a hassle, and you have to deal with batteries).
In summary: the TM912 is usable, if a bit annoying. For $36 it's not bad. I would have happily paid more for better quality and fewer bugs...