XK K110 (S-FHSS) build for Devo 7E and Devo 10

@Victzh,
The DEVO 10 user report he use 3in1 module, can't bind with K120.
Some guys use Futaba TX also has this problem

SFHSS protocol is no problem to adjust the CC2500_0C_FSCTRL0.
I've added the option menu 'Freq-Fine'. I confirm the operation at all the receivers that I have.
'CC2500_0C_FSCTRL0' is of +25 was the best.

I want F / S function. Please.

Ryou wrote: SFHSS protocol is no problem to adjust the CC2500_0C_FSCTRL0.
I've added the option menu 'Freq-Fine'. I confirm the operation at all the receivers that I have.
'CC2500_0C_FSCTRL0' is of +25 was the best.

I want F / S function. Please.

Could you please help to create a test build for DEVO 12S with "Freq-Fine" option?

'Devo12s' it does not work make sure I do not have.
Two compilation of results 'DFU' file and publish a short period of time.
please try it.

yahoo.jp/box/yZlClD

Ryou wrote: 'Devo12s' it does not work make sure I do not have.
Two compilation of results 'DFU' file and publish a short period of time.
please try it.

yahoo.jp/box/yZlClD

Thank you Ryou.
I downloaded these 2 file devo12.dfu and devo12-lib.dfu , but I'm confused , what is devo12-lib.dfu for?
Only Walkera stock FW need lib file I remember.

Please check www.deviationtx.com/downloads-new/catego...-s-fhss-freq-options

It has build for Devo 7E, Devo 10, and Devo 12S.

devo12-lib.dfu is needed for Deviation as well, check User Manual www.deviationtx.com/manuals/html-devo8/c...n-with-walkera-dfuse .

Thanks Victzh, I don't have DEVO 12S .........
Sorry to Ryou.

I do not know the necessary files so was compiled for the first time 'devo12'.
Maybe devo12-lib.dfu I think unnecessary or. I do not know I'm sorry.

File public was stopped.

Ryou, as I mentioned both files are needed and the process is described in mentioned manual very thoroughly. I installed it on my Devo 12S. The problem is it's not modded so I can't test the actual options. I tested that options are there on my Devo 7E, but as I don't have problem with frequency deviation I can't confirm it solves the problem.

Ryou wrote: I do not know the necessary files so was compiled for the first time 'devo12'.
Maybe devo12-lib.dfu I think unnecessary or. I do not know I'm sorry.

File public was stopped.

No problem, Thanks for helping.

Test Result , Bad News
Ryou's DEVO12S version : -60 ~ +120 , step 5 , fail , can't bind to K120
Victzh's DEVO12S version : 0~+127 , step 5 , fail , can't bind to K120

@victzh :
What's "Freq-Coarse" for ?

Please try to press the bind switch close the transmitter and helicopter.
It seems difficult to bind to the output of the transmitter is small. 30mW or higher is required. Try again and again.
In my experiment "Freq-Coarse" You think so it is better not to change.

Good luck.

Ryou wrote: Please try to press the bind switch close the transmitter and helicopter.
It seems difficult to bind to the output of the transmitter is small. 30mW or higher is required. Try again and again.
In my experiment "Freq-Coarse" You think so it is better not to change.

Good luck.

The limitation of Freq-fine is +/- 127 , what's your recommend range for test? +/-5 for each step ok?
Thank you very much.

Freq-fine is sufficient for 20 step position.
I do not have a problem at the same +25 in three Devo7e, Devo10, Devo8. CC2500 was also the same in the two types.
In the FUTABA transmitter Bind has been described within the 50cm. Note that the radio waves are not Bind and weak is required.
Without problems radio waves will reach Once Bind.

Victzh,

Would you know where to get good crystals? I would rather replace crystals on bad RX or TX RF modules to make them work.

I doubt it will work. Crystal frequency depends on load (small caps near the crystal) and you need to debug the system in its entirety - check that the generated frequency matches the declared one (26MHz for typical use in CC2500). Just replacing crystal can do more harm than good.

After many many times testing ,both Victzh & Ryou's test build still not bind to K120 on DEVO12S user(3in1 module),
he want to give up and trying to install stock X6 RF module to his 12S.
Thanks Victzh & Ryou' s help.

@Victzh,
Is this problem causer by poor quality of " RX crystal " ? because my K120 seems no problem with many different CC2500 module.

It's all a hypothesis of why it CAN happen. It is a fact, that crystal tolerance is important and different radio chip providers take different measures to compensate for crystal frequency deviation. Some chips are more automated - they tune frequency by themselves. CC2500 is on lower level side - it provides you with the tools to do so but you're not obliged to.

Unfortunately these tools are more suitable for receiver side and there is a mention of how to do this in chip's datasheet. It seems not everyone uses the chip properly just relying on crystal match.

I can look at this once more to try to extend tuning range, but if I faced the situation myself it would be easier. Remote debugging goes only so far, especially for RF.

Sorry for verbosity, briefly I think yes, RX is to blame.