RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver technical review.  
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All Forums >> RC Helicopters >> Electric RC Helis >> Walkera Helis - Dragonfly, etc.. >> RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver technical review.
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RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver te... - 5/20/2005 9:49:32 AM   
rotarypower3


 

Posts: 76
Joined: 2/20/2005
From: Melbourne, AUSTRALIA
Status: offline 		I have tried to get my Walkera TX to work with 2 different receivers (gws and align) with no real success. I have read elsewhere of people having no luck with using any other tx with the walkera rx either, apparently it uses it's own style of PPM/PCM.....

(in reply to Heliboy71)
       Post #: 26

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver te... - 5/20/2005 3:08:34 PM   
bluesky123


 

Posts: 371
Joined: 1/8/2002
From: Boulder, CO, USA
Status: offline 		rotarypower3,

Probably, you are having Xtal compatibility problems. I've tested several of my Walkera transmitters (from unbelievably crappy 4ch heli to just simply crappy 6ch transmitters from 22A, 22E, and 35 models) and they all worked with my receivers just fine. I tested them with an old Hitec 3500, Sky & Technology CRX-M7 DSP receiver, and a small Hitec single conversion 5ch RX--all worked fine.

All Walkera transmitters I've seen use the standard PPM signal, it just has a bit longer frame duration (ot shorter pauses between channel pulses?) than the other radios. A bit like Futaba radios of early 90s...

Boris
www.milehighwings.com

< Message edited by bluesky123 -- 5/20/2005 3:11:42 PM >

(in reply to rotarypower3)
       Post #: 27

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver te... - 5/20/2005 3:59:06 PM   
rotarypower3


 

Posts: 76
Joined: 2/20/2005
From: Melbourne, AUSTRALIA
Status: offline 		You're probably right about the xtals Boris.
Both the rx's are 36mhz, the walkera tx is 35mhz.... I tried 2 sets of the 35mhz xtals and two sets of 36mhz... all I ended up with was constant glitching..... Oh well doesn't matter anymore as I bought a REAL radio and will just use both the walkera tx's I've got for FMS...

(in reply to bluesky123)
       Post #: 28

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver te... - 5/20/2005 4:41:03 PM   
Heliboy71


 

Posts: 3
Joined: 5/19/2005
From: Melbourne, AUSTRALIA
Status: offline 		thats all fine, but its not the radio i care about as for the radio gear, i could use it prop up my garage heli bench ! its that useful to me - I wanted to use my HITEC eclipse 7 radio with the WALKERA Receiver / spd / gyro , and thats where the prpblem starts...

anyway, becuause of all the added frustration and getting no where - i put an old e-sky combined speedy and gyro unit with a 35 mhz receiver i found lying around the garage into the front box of the walkera and it works fine..

im just suprised that its that hard to get a 35 mhz receiver from china to work with a professional radio?

go figure.

(in reply to rotarypower3)
       Post #: 29

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver te... - 5/21/2005 2:38:24 AM   
oops


 

Posts: 664
Joined: 2/26/2005
From: Perth, AUSTRALIA
Status: offline 		The Walkera stuff is almost common in it's formats. Except there are extra channels used by the TX to send control information to the RX... Without the correct coded signal, the RC won't work - it's a safety feature. You could probably crack it- but it's not worth it.

Just replace the Walkera stuff.

Anwyay. I have been able to use my Walkera 4ch with a Futaba receiver just fine. And you can also change the 35 MHz to 36MHz with just a crystal change.

David

(in reply to Heliboy71)
       Post #: 30

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver t... - 11/30/2005 7:33:33 PM   
chris6414



Posts: 624
Joined: 12/23/2004
From: Warminster , PA, USA
Status: offline 		I have a new twist on all of this. Anyone find compatible crystals other than the ones that come with the walkeras, that will work. Mine are type 72-4s and I tried other FM crystals from my Futaba set but they wouldn't work. Will Futaba FM crystals work in Walkera radio gear? and if not why won't they? Wrong type? Could I have the wrong band for the receiver?

I believe my crystal (s) are bad and of course don't have any walkeras to test it. I understand why the radio gear is not compatible, but why the crystals??

< Message edited by gysgt6414 -- 11/30/2005 7:34:15 PM >

(in reply to oops)
       Post #: 31

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver t... - 1/13/2006 2:09:59 AM   
franky888


 

Posts: 7
Joined: 12/12/2005
From: JakartaDKI Jakarta, INDONESIA
Status: offline 		Does anyone know how to play Reflex XTR without USB connector? the transmitter is connected to the PC through sound card line input using cable, some say it can be done with a few modification in the reflex xtr file configuration setting.
Is this as simple as replacing the input section in file configuration setting with sound card address? which is the default is seeking an USB address, so when the program is launch, it's should directly search to sound card line input address, looking for a controller, coz I've heard someone has already success doing this, due to all of his computer USB ports are broken... this is similar as FMS default connector. Does anyone know or have heard before about this?

(in reply to chris6414)
       Post #: 32

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver t... - 1/23/2007 7:15:06 PM   
e1000


 

Posts: 24
Joined: 1/23/2007
From: san juan, ARGENTINA
Status: offline 		hello! anybodie out there? this thread is a bit old, but i hope someone reads it....
im a somewhat skilled electronic engineer, and love RC. Ive recently bought a Walkera #4 receiver, just for the fun of it, and im still trying to make it work. everything ive read here seems to make sense... but still theres something missing. if theres anyone out there who can post an oscillogram of a walkera transmitter, so i can decipher it, it would be great. Ive programmed a pic and an HC08 to emulate an 8 channel PPM signal, but still nothing... anyone has a walkera transmitter, an oscilloscope and 2 seconds time? ill be grateful! and i promise to post everything i find out. thanks!

(in reply to franky888)
       Post #: 33

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver t... - 5/30/2007 4:36:19 AM   
vega2614


 

Posts: 573
Joined: 7/23/2006
From: Morton Grove, IL, USA
Status: offline 		Has anyone tried using the 4-channel PPM E-Sky Lama V3 transmitter with the Honey Bee King/Cool 6-channel PPM receiver? I want to save money by using my Lama transmitter for a plane, so I want to get a compatible receiver. EK2-0420 seems compatible, but I'm not sure. Thanks.

(in reply to e1000)
       Post #: 34

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver t... - 10/28/2007 11:08:33 PM   
Dzl


 

Posts: 2
Joined: 10/28/2007
From: , DENMARK
Status: offline 		Hi,

Just got a trashed Dragonfly 4. Repaired mechanics but had no TX. I borrowed a matching TX and hooked it up to a oscilloscope. It uses a regular PPM frame with Throttle at ch3, tail at 1, elevator at 2 and aileron at 4. Channel 5 thru 9 must be at -100% or the RX won't start.

One catch!

The whole PPM frame is compressed in respect to standard timing.

Solution:

Crack open the RX. Replace the 4MHz resonator (for the built in microcontroller) with a standard 3.2768MHz crystal. Now the RX is compatible with any standard TX, which can assign these channels and put CH5-9 at -100%. I uas a Multiplex EVO9

While you have the RX open replace the crappy 5V regulator with one that will drive both servos simultainously

(in reply to e1000)
       Post #: 35

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver t... - 10/29/2007 2:56:32 AM   
e1000


 

Posts: 24
Joined: 1/23/2007
From: san juan, ARGENTINA
Status: offline 		Hello!! yes, i`ve evolved since i posted this!!! The receiver needs 9 active channels to initialize, and then it just uses the first 4 and drop the rest. Ive still have not find out if channels 5-9 have any influence on GYRO-MIX-or whatever. Im currently developing a transmitter based on an old hacked JR F400, and a programmed ATMEL ATMEGA8 to do the whole processing (AD, PPM, etc). If youre interested, ill post some results (whenever i have them!)

(in reply to Dzl)
       Post #: 36

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver t... - 10/31/2007 2:32:32 PM   
Dzl


 

Posts: 2
Joined: 10/28/2007
From: , DENMARK
Status: offline 		I have tried to fiddle with chan 5-9. It seem that their only purpose is safety. The speed controllers shut down if any of these channels are above -25%.
I think rather than coding a whole new transmitter just do the hack and use a regular TX. Or perhaps a add-on like we did for X-Twins

http://webx.dk/rc/xtwin/xtwin.htm

(in reply to e1000)
       Post #: 37

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver t... - 10/31/2007 3:02:35 PM   
GTX SlotCar



Posts: 2070
Joined: 10/7/2005
From: Gorham, ME, USA
Status: offline 		The DF4 Tx uses the Zhen Hua 5 byte protocol. This isn't used much by anything anymore. Outside of (maybe) an old Futaba Tx, your DF4 receiver will only work on it's own Tx.
I believe the DF4 Tx will work with some other Walkera Rx's, but the DF4 Rx only works with it's own Tx. Hacking the Rx may be the solution.

_____________________________

Gary
SuperSkids® www.super-skids.com

(in reply to Dzl)
       Post #: 38

RE: Walkera/Dragonfly/Esky 4ch transmitter/receiver t... - 10/31/2007 3:54:28 PM   
e1000


 

Posts: 24
Joined: 1/23/2007
From: san juan, ARGENTINA
Status: offline 		ive read a lot about this zhen hua, im still not convinced. The walkera #4 RX is just a normal negative modulation (that is, NRZ) PPM with 350uS mark timing and 300uS (non standard) - 1600uS space timing. besides the slight non standard timing, its a normal straightforward PPM. Perhaps some new Tx and Rx uses Zhen Hua, i wouldnt know, ive not laid my hands on those yet ( ). Ive a homemade TX with ATMEGA, and it works fine. However, its very interesting,
quote:

The speed controllers shut down if any of these channels are above -25%.
, ive not tried that one yet. Good one. Any electronic-hacking lover out there wants to join?

(in reply to GTX SlotCar)