XK Protocol Question

But K110 does support S-FHSS?

Yes

Or, say the combination of XK X6 and Orange SF700S should work and support S-FHSS. I am trying to minimize financial damage here

victzh wrote: @dc59, can you upload your pictures somewhere else and post links here?

I can upload it now!!

and I am sure that TX(X6) come with XK K120/K110 used S-FHSS protocol.

The XK K110 have the CC2500/ S-FHSS

XK X250 Quad X4 TX => V202 protocol
XK DHC-2 A600 plane X4 TX => S-FHSS protocol
XK K110/K120 helicopter X6 TX => S-FHSS protocol

Ordered K110 RTF - Banggood US store has a promotion - $99.

victzh wrote: Ordered K110 RTF - Banggood US store has a promotion - $99.

Good so one major protocol now have really chance to be deviated

With the FrSky D16 and the new FlySy 2-way... it would be so so great ....

victzh wrote: Ordered K110 RTF - Banggood US store has a promotion - $99.

Good news ~~~

@dc59, I took a look at your traces. Unfortunately, they're only partially useful - the initialization information is missing. To capture it, you need to set trigger on ENABLE going down in the logic analyzer, start recording when the TX is off and turn it on. All the secrets are in the initialization code, without it we even can't tell what frequencies it uses - the channel number is relative to other parameters. If you can do this for both X4 and X7 it would help. The more traces the merrier.

@SeBy, if you have TXs, can you also get traces for various stages.

My XK is on the way from Canada, they promise it only on Feb 19.

victzh wrote: @dc59, I took a look at your traces. Unfortunately, they're only partially useful - the initialization information is missing. To capture it, you need to set trigger on ENABLE going down in the logic analyzer, start recording when the TX is off and turn it on. All the secrets are in the initialization code, without it we even can't tell what frequencies it uses - the channel number is relative to other parameters. If you can do this for both X4 and X7 it would help. The more traces the merrier.

@SeBy, if you have TXs, can you also get traces for various stages.

My XK is on the way from Canada, they promise it only on Feb 19.

Hi Vitzh,
I got trouble when I captured those SPI data, If I connected CLK pin to analyzer before I turned on TX power, TX will hang ,
I can just turn TX power on then connect CLK to analyzer and captured SPI data,that's why you see partially data in SPI file,
I tried both X4 and X6 TX,all they got same result, do you have any other idea for it?

victzh wrote: @@SeBy, if you have TXs, can you also get traces for various stages.

My XK is on the way from Canada, they promise it only on Feb 19.

I will

@dc59 - your logic analyzer loads the clock driving chip too much. It should not be so, the chip used in logic analyzer itself is not bad. What can happen is your wires are too long, or some dirt accumulated somewhere - for instance, if you used acidic flux to solder to the TX and did not clean it up properly. That's what comes to mind. If you have an oscilloscope it would be easier to diagnose. Also, you can try to connect your LA through resistors - 100-200 kilo-ohms, may be even more. It should sense the signal but reduce the load.

victzh wrote: @dc59 - your logic analyzer loads the clock driving chip too much. It should not be so, the chip used in logic analyzer itself is not bad. What can happen is your wires are too long, or some dirt accumulated somewhere - for instance, if you used acidic flux to solder to the TX and did not clean it up properly. That's what comes to mind. If you have an oscilloscope it would be easier to diagnose. Also, you can try to connect your LA through resistors - 100-200 kilo-ohms, may be even more. It should sense the signal but reduce the load.

Hi Victzh,

I don't have an oscilloscope, I will try to connect LA through resistor first!
Thanks for helping!

@Victzh,

I tried few different resistors 100k/220k/470k and it still dosen't work, I can't power on TX while CLK connected to analyzer.

@Seby

Do you have same problem?

OK, will wait for SeBy or for mine own.

How do you connect to it - solder? How long the wires? What logic analyzer do you use - Chinese clone?

victzh wrote: OK, will wait for SeBy or for mine own.

How do you connect to it - solder? How long the wires? What logic analyzer do you use - Chinese clone?

I think my analyzer is a clone one,it costs around USD $10.
I solder it to CC2500 ,wire is around 10cm.

Another option is to connect the radio chip through a buffer - it should isolate it even more, but it's more complicated. I'll check it on my own soon.

I've got my K110 - signal quality must be really crappy on the SPI bus as it's very sensitive. I was unable to get MISO work reliably, but as S-FHSS is one way protocol (no telemetry) it does not matter much.

I've got the start-up of the chip, so I can find what 'channel' means, what data rate it uses etc.

I need to tap a receiver also, and K110 board is not an ideal way to do this - it's so small and hard to solder to. I ordered SF700S from HobbyKing, and it's coming, very slooooowly - they only have it in International Store, and I'm in US.

victzh wrote: I've got my K110 - signal quality must be really crappy on the SPI bus as it's very sensitive. I was unable to get MISO work reliably, but as S-FHSS is one way protocol (no telemetry) it does not matter much.

I've got the start-up of the chip, so I can find what 'channel' means, what data rate it uses etc.

I need to tap a receiver also, and K110 board is not an ideal way to do this - it's so small and hard to solder to. I ordered SF700S from HobbyKing, and it's coming, very slooooowly - they only have it in International Store, and I'm in US.

Hope you could get SF700S sooner !!
If there is anything I can help,please let me know,thanks.