Quick review – Turnigy i10 telemetry transmitter

 misc, Uncategorized  Comments Off on Quick review – Turnigy i10 telemetry transmitter
Dec 312015
 

I purchased this 10 channel transmitter ‘on sale’ from Hobbyking; only mode 2 so needed to change to mode 1 which just meant reversing the gimbals and changing the mode setting in the transmitter. There are lots of ‘unpacking’ videos on Youtube so I won’t even go there. The first thing you notice is its so thin which is possible as it uses a 1 cell lipo which is charged via a mini USB connector so no problem there as I have lots of these cables even in the car. The ‘net’ advises that the mini usb plug is a bit fragile so we will have to see. It uses a touch sensitive screen which is fun to play with and quite usable.

Without any external sensors, it displays the receiver voltage and error rate. In full sun its hard to read the lcd screen but then, unless you are flying a glider or similar, you need to focus on the task at hand, flying the model. The standard package comes with 2 external sensors as well. The transmitter doesn’t support speech but has beeps and things. I have had about 5 flights so far and no errors when flying at Trentham (now is that a good thing??).  At this stage there are few other receivers available for use with this transmitter although the standard 10 channel receiver is $US20 which is good except it is a bit big for that smaller model. The trims for elevator and throttle are not in the normal place but too early to say that this is an issue.

The sticks are too short so I borrowed some longer ones which feels better. All the switches are assignable to the extent that you need to assign the switch you want for rates and expo… so its quite flexible.

It doesn’t have the quality of some of the named transmitters but its a great radio and I intend to get some more receivers for other models. The reviews I have read on that there internet thing are favourable but again, its a personal thing.

Its currently retails for $US177 from the Aussie Hobbyking warehouse http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=75276 which is not bad value (but then I got it cheaper in the Hobbyking sale!!)…   Some will prefer the Taranis which is probably more flexible (its has a module which the i10 does not).

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Turnigy i10 + electric test plane (which is quite aerobatic)

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Turnigy iA10 receiver installation.

 

FPV Monitor Problem

 equipment, fpv  Comments Off on FPV Monitor Problem
Aug 172015
 

fpv monitor testingThe Problem

This monitor-receiver combination looses the image to a snowy screen regularly, even when the 200mW video transmitter is within 10 meters.

The way it would suddenly come and go, it looked like a connection problem or bad joint on the video lead between receiver and monitor.

We were expecting a more consistent better image with occasional noise and some interference. For FPV, a noisy image is better than no image.

To eliminate the connections a direct soldered lead replaced the two leads and RCA connectors. But the problem continued.

fpv monitor testingTesting the Receiver and Monitor

I resurrected an old 10mW 5.8GHz transmitter with clover-leaf antenna and mini camera to provide a relatively weak signal that could be easily blocked to simulate a longer range. Also a second receiver and monitor to sit nearby just to keep an eye on the transmitter and as a comparison.

The RC-832 receiver seems to be fine. The receiver was compared against an older RC-305 and there was no noticeable difference in sensitivity or image quality.

The other receiver-monitor would indicate interference and noise but would not loose the image completely.

As a second comparison I connected two monitors to the RC-832 receiver; it has two AV outputs. The suspect monitor and another monitor that looks identical but is just from a different seller. The suspect monitor was cutting out while the other was displaying a noisy image. To be sure it wasn’t the AV output, the monitors were swapped over; the problem remained. So it is definitely a problem with the suspect monitor.

 

fpv monitor testingThe suspect monitor passed the bump/vibration testing,confirming it’s not a vibration or movement induced problem.It doesn’t take much interference to completely loose the image, which takes a second or two to return. Not much use for FPV.

Using a clover-leaf antenna on the transmitter and linear antenna on the receiver is not ideal and the problem is quite bad, even over just a few meters. Using a circular polarised antenna n the receiver (clover-leaf or skew-planar) noticeably improves it; fewer drop-outs. Which makes sense, but does not really solve the problem.

fpv monitor testingTest Conclusion

Image loss does coincide with signal level fluctuations and interference. It even completely looses image when simply moving about near the receiver.
It seems that this is just how this monitor responds to a noisy signal or interference. It is not very good at detecting the video sync of a noisy signal. Or it’s a left over of a blue-screen function.

Of 3 monitors that look identical, only one has had this problem. It is sold on various sites as a cheap 7″ LCD monitor for FPV. The problem now knowing how to avoid the dud.

Other Notes:

  1. I sat the test transmitter rig in our microwave oven to reduce the signal. It didn’t work. Those little holes in the screen behind the window are apparently not small enough to block 5.8GHz. Either that, or there is another leak somewhere. I haven’t seen anything glowing in the dark yet.
  2. Two apparently identical monitors behave quite differently. One has no blue-screen but cuts out with interference. The other does blue-screen but displays very noisy images and only blue-screens when the image is unusable. One displays much brighter and more colour when both at the same settings.