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 Video Transmitter Reliability

 equipment  Comments Off on FPV Video Transmitter Reliability
Aug 252015
 

fpv video transmittersIt sounds like an overheat failure

This picture shows the miniature 32 channel transmitters as supplied (before overheating) and a New Zealand coin to indicate size.

I have used, seen and repaired some video transmitters with very poor thermal design. Overheat failures are quite common. Many underestimate the need for cooling. The VTX produces heat even when the model is not moving; unlike the ESC.

It is probably a reverse polarity protection diode that has failed; if it is a series. If the board has not been badly burnt, it may be repairable.

Measuring the current draw before extended use is a good idea as it gives an indication that all is well. An antenna fault or connection problem can greatly increase VTX current draw and heating.

Video transmitters are very inefficient; transmitted power is a fraction of the power in. Therefore a lot of heat is dissipated in the transmitter. Voltage regulators on transmitters are almost all switching types now, to reduce the heating problems; but it’s only a partial solution.

I sometimes include a switch to turn the VTX off while the model is on the bench or waiting for GPS lock etc. It reduces internal heating when there is no flight induced air-flow; and it saves the battery. Also handy if you want to swap or adjust the VTX antenna without powering down the model.

I recently bought two 200mW and two 600mW miniature video transmitters from China (just arrived – pictured above) for my mini-fpv-wing project. VTX power supply and cooling are major design considerations. It will have RTL, but it’s always a good idea to include a reliable video transmitter.