Thread Tools
This thread is privately moderated by smoothvirus, who may elect to delete unwanted replies.
Jan 05, 2014, 11:41 PM
Registered User
smoothvirus's Avatar
Thread OP
Mini-HowTo

Connecting EzUHF transmitter to FrSky Taranis


I have had a few people ask me about how to connect the EzUHF Transmitter to the FrSky Taranis, here's what you need to do.
First off, you will want to provide 12v of power to the EzUHF transmitter. The stock Taranis battery cannot provide this. This battery from Hobbyking will get you 12v. You will need to cut one of the battery leads off and replace it a 2s JST-XH connector, you can get this one and just cut the male plug off. The de-pin the center wire and remove it. Solder the red wire to red wire on battery likewise with the black wire. That battery is a bit of a tight fit but it does work.

-note: I have since found out that it will work with the stock battery. Your output power will be lower, as you can see from this post on FPVLAB.


Next you'll need [URL="http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=165_40&prod ucts_id=1188"]this cable.[/
URL] It connects to the pins of the module bay in the Taranis, here's a photo of the pinout:
(edit: the EzUHF unit actually comes with the cable already. )
When you get the cable from ReadyMadeRC you will need to move the black wire on the connector down two spots so that it connects to pin 4, GND.

I used this transmitter stand and then a 12" velcro strap from REI to attach the EzUHF transmitter to the back of my Taranis.

In Companion 9x you have to use these settings for RF Module 1 and RF Module 2:
RF Module 1
Protocol: OFF
RF Module 2
Protocol:PPM
Start:1ch
Channels:8ch
PPM Frame Length: 22.5 mSec
Polarity: Positive
PPM Delay: 300 usec


-note2: You can actually set it up for as many as 12 channels. For 12 channels you set PPM Frame Length to 26.5mSec, you can leave the other settings the same.


**WARNING** if you have the 2 Watt EzUHF unit do not use this method to connect to your Taranis! You must power it with a separate lipo battery or you can damage the Taranis - this is per ImmersionRC support.
Last edited by smoothvirus; Mar 29, 2017 at 11:39 AM.
Sign up now
to remove ads between posts
Mar 12, 2014, 08:56 PM
Outlaw
gatorb8's Avatar
smooth,
thanks for the writeup!
Do you know.....if I want to do 10 or 12 PPM channels do I need to change the PPM frame length in the taranis setup? are there guidelines or rules for that?
thanks!
Mar 14, 2014, 03:58 PM
Registered User
smoothvirus's Avatar
Thread OP
Thanks gatorb8!
I went to research your question, and found your thread on FPVlab, where Reliku answered it better than I could, so I'll post a link here in case anyone else needs that information.

http://fpvlab.com/forums/showthread....PPM-frame-rate

Quote:
To understand this, you first need to understand how PPM works:

A PPM signal is a series of pulses going from high to low voltage (one such series is called a frame). The duration of one of these pulses (or length) corresponds to a certain value of a channel's output. E.g. if you move the throttle stick (which is in most cases ch1) the length of the first pulse changes. The length of this pulse changes from in between 1000us and 2000us.

PPM frame length is the length of a series of pulses that constitute your PPM signal (a frame), a full frame length (at least for 8ch) is 22.5ms, which is all you'd need (with 8ch). Adjusting the frame length has an impact on the refresh rate, but it doesn't matter too much as long as you don't get to crazy frame lengths. However: to get the full frame length for 10 channels (which is what you use) you'll have to set it at at least 26.5ms (because you have two channels extra which can take up an additional 2ms per channel). It'll probably work on a lower frame length but your last few channels will disappear.

The polarity determines whether the default value of the signal is +1 or 0 (high or low). This is best understood using a picture:





In other words, it's going up and down or down and up. AFAIK many systems can work with either, but the taranis has openTX (unless you flashed it) and AFAIK there was an issue with negative polarity on openTX a while ago. Not sure whether it was fixed, but if it works on positive stick to that.

The delay is the time in between two pulses, which is 300us in this case. That's fine, leave it at that.

TL;DR:
set frame length at 26.5ms, polarity at positive and delay at 300us.

Cheers,
Reliku
Last edited by smoothvirus; May 07, 2015 at 08:45 AM.
Mar 15, 2014, 10:59 PM
Outlaw
gatorb8's Avatar
Very funny!
May 07, 2015, 03:32 AM
Go foam or go home!
adamtoo's Avatar
Hmm I just tried this and when I connect the Ezuhf the Taranis screen starts flashing and making a little sound. Lemme double check my wires and then maybe video the phenomenon. I have ch1-8, 22.5 us, 300us, and positive polarity and internal off and external ppm.

Update , red led on ezuhf tx does not turn on when plugged in.


7 maj 2015 (0 min 25 sec)
Last edited by adamtoo; May 07, 2015 at 03:55 AM.
May 07, 2015, 08:49 AM
Registered User
smoothvirus's Avatar
Thread OP
Everything looks right.. have you tried connecting the EzUHF module with the Taranis turned off, and then turning the Taranis on? If you do so does it do the screen blinking thing?
May 07, 2015, 09:58 AM
Go foam or go home!
adamtoo's Avatar
Will try this. I have tried powering the ezuhf separately but that doesn't help. However, if I power the ezuhf separately and only have gnd and ppm coming from taranis everything is fine. Someone else told me there might be an issue with too low of voltage causing the ezuhf to draw excessive current through the module bay. This seems unlikely but I also need to try powering the radio with a 3s lipo that was just at the bottom of my list as it requires me making a little wire harness. Also, I know the ezuhf works fine with other radios all the way down to 4.5V, at which I had a failsafe at 100m.

UPDATE

Turning on the Taranis after ezuhf is connected does not help. I just get a slightly different issue. The Taranis loops between splash screen and throttle warning.

Quote:
Originally Posted by smoothvirus
Everything looks right.. have you tried connecting the EzUHF module with the Taranis turned off, and then turning the Taranis on? If you do so does it do the screen blinking thing?
May 07, 2015, 10:14 AM
Go foam or go home!
adamtoo's Avatar
UPDATE to my issue as described in above posts. I have now powered radio with 3S lipo at 11.6 V but same issue. When I turn on the Taranis with EZuhf plugged in, the radio just loops between splash screen and throttle warning. Regardless of power setting on ezuhf Tx.
May 07, 2015, 12:36 PM
Registered User
smoothvirus's Avatar
Thread OP
You have some kind of power issue with the Taranis but I'm not sure what.
Jun 21, 2015, 01:03 PM
Registered User
Hello everyone. I recently purchased a used TBS Disco (Non Pro ).

Due to what I've been reading with the Dx8 and EzUHF, I've decided to purchase a Taranis X9D Plus.

Can someone please re confirm the following list is complete to get me going

1. 5p Molex to 4-pin Mini-Din JR Style Module to EzUHF-TX

http://www.getfpv.com/4-pin-mini-din...-jr-radio.html

2. Lipo (Turnigy 2650mAh 3S 1C LLF Tx Pack (Futaba/JR) )-

https://www.hobbyking.com/hobbyking/s...dProduct=59010

3. Not required but like the idea- Transmitter Stand Full JR/Spektrum/Futaba V1
http://www.espritmodel.com/transmitt...rumfutaba.aspx


4. Connect lipo to power EzUHF - JST-XH Parallel Balance Lead 2S 250mm (2xJST-XH) https://www.hobbyking.com/hobbyking/s...2xJST_XH_.html

Seems this item is only avail overseas, if someone knows of an alternative , that would be great.
Last edited by Praztek; Jun 21, 2015 at 01:15 PM.
Jun 21, 2015, 04:46 PM
Registered User
smoothvirus's Avatar
Thread OP
Quote:
Originally Posted by Praztek
Hello everyone. I recently purchased a used TBS Disco (Non Pro ).

Due to what I've been reading with the Dx8 and EzUHF, I've decided to purchase a Taranis X9D Plus.

Can someone please re confirm the following list is complete to get me going

1. 5p Molex to 4-pin Mini-Din JR Style Module to EzUHF-TX

http://www.getfpv.com/4-pin-mini-din...-jr-radio.html

2. Lipo (Turnigy 2650mAh 3S 1C LLF Tx Pack (Futaba/JR) )-

https://www.hobbyking.com/hobbyking/s...dProduct=59010

3. Not required but like the idea- Transmitter Stand Full JR/Spektrum/Futaba V1
http://www.espritmodel.com/transmitt...rumfutaba.aspx


4. Connect lipo to power EzUHF - JST-XH Parallel Balance Lead 2S 250mm (2xJST-XH) https://www.hobbyking.com/hobbyking/s...2xJST_XH_.html

Seems this item is only avail overseas, if someone knows of an alternative , that would be great.
1. That's the correct one, keep in mind one comes with the EzUHF.

2. Correct.

3. There are cheaper ones available but this one is prettier..

4. They'll ship to the USA. I actually got mine from a local hobby shop.
Jun 22, 2015, 05:40 AM
Registered User
thank you for the information
I'll be placing my order today also if anyone knows where I can get the following a little bit quicker please reply

JST-XH Parallel Balance Lead 2S 250mm

Jun 22, 2015, 07:10 AM
Registered User
smoothvirus's Avatar
Thread OP
I'm on my phone but I think buddyrc.com has them.
Jun 22, 2015, 07:24 AM
Registered User
Quote:
Originally Posted by smoothvirus
I'm on my phone but I think buddyrc.com has them.
Thanks,

http://www.buddyrc.com/jst-xh-2s-par...-cable-x2.html
Jun 22, 2015, 08:01 AM
Registered User
smoothvirus's Avatar
Thread OP
Quote:
Originally Posted by Praztek
That looks like two female connectors, you need a male connector.


Quick Reply
Message:
Thread Tools