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Old 05-31-2018, 10:10 AM   #1 (permalink)
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Join Date: Mar 2012
Location: Wauwatosa, WI
Default FrSky/OpenTX FAQ

So I’ve seen a bunch of similar threads in the last couple of months with the same questions being asked over and over. I’ve looked through those threads and copied out or paraphrased some of the best answers that I’ve seen. I thought it was time to make a post with common Q&A’s. If you’d like to add, please do:

Q – Is OpenTX hard? How do I learn it? What’s the best way to learn it?
A – Go to Welcome to OpenTX and download the companion software. It will let you try everything in OpenTX without buying a single bit of hardware. You can also fully simulate your setup to look at how inputs and mixes impact individual output channels. Ask questions, look at YouTube, and as o this writing, the most recent guide on this forum is here:

Q – Does the software allow me to do… (insert anything, literally anything here) ?
A – The software is very flexible and just about anything you can dream up can be accomplished in it. The downside is that there are usually 2-4 ways that it can be done. At least one of them is easy.

Q – Which RX should I choose?
A – The most commonly used on a helicopter is the X4R-SB. It’s inexpensive, has redundant whisker antenna, and supports SBus output. All this can be done without custom connectors. If you would like something smaller and are not afraid of working with wires, you can choose the R-XSR which has the same features as the X4R-SB.

Q – Is the signal robust?
A – Very. The system also includes signal strength telemetry with all X series receivers.

Q – How can I get telemetry on my battery usage?
A - 1 - For the heli's with the Ikon 2 or Spirit FBL's installed, and if your ESC supports telemetry, all you need is an extra cable from MSH or Spirit to get the mAh and voltage. If either you have an original Ikon or a non telemetry ESC, this is not an option. This is the cheapest option.
2 - You can get a Unisense-E sensor that is inline with your main pack lines. This will give you mAh, V, RPM and altitude.
3 - For your 325 and smaller models, FrSky sells a 40A inline current sensor that you can use. Will give you mAh and V.
4 - There is a voltage monitoring sensor that you can buy from FrSky that will give you pack voltage based on a reading from the balance lead. This will provide you overall pack voltage as well as individual cell voltage. You can pair this with a FrSky 150A current sensor to get both V and mAh.

Q – Can I use my Taranis/Horus with a simulator?
A – Yes. You can either use the USB port as a “Joystick” output or buy a 10-in-1 simulator cable that plugs into the trainer output jack.

Q – How do I get my Taranis/Horus to work with my Blade/Trex/XK/other helis?
A – You use an iRange module or multiprotocol module available from multiple sources. The modules make many TX protocols available for usage in the transmitter. These include DSM2, DSMX and S-FHSS. These are constantly being updated/improved so I won’t include links. Just make sure that the module you buy supports the protocol you need.
P Max v2, G570, N556, S516, P380, XK K110, Open-TX
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