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Finding a source for CYRF6936 transceivers

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10 Feb 2014 04:57 - 10 Feb 2014 04:59 #20050 by RW9UAO
Replied by RW9UAO on topic Finding a source for CYRF6936 transceivers
i have one of walkera TX module.





more idea, using this
www.hobbyking.com/hobbyking/store/__2465...igy_compatible_.html
inside: atmel Xmega32 and RF board with CYRF, +20 dbm PA and RF switches.

CYRF_write(0x0E, 0x80); //XOUT, RX mode
CYRF_write(0x0E,0x20); // PACTL, TX mode
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Last edit: 10 Feb 2014 04:59 by RW9UAO.

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10 Feb 2014 06:50 #20053 by PhracturedBlue
Replied by PhracturedBlue on topic Finding a source for CYRF6936 transceivers
That would be a last-option from my perspective. It is going to be difficult to integrate into Deviation and is cost prohibitive. I needto remove the shield from my cyrf7936 module and see what is going on there. I think it is my best bet at the moment.

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10 Feb 2014 14:17 - 10 Feb 2014 14:18 #20067 by vlad_vy
Replied by vlad_vy on topic Finding a source for CYRF6936 transceivers
Unigen LETO-LPA (UGWJ4USHN33)
www.northstarmicro.com/rf-if-and-rfid/rf...sceivers/ugwj4ushn33

www.digikey.com/product-detail/en/UGWJ4U..._octopart_dkc_buynow
Last edit: 10 Feb 2014 14:18 by vlad_vy.

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10 Feb 2014 14:26 #20069 by PhracturedBlue
Replied by PhracturedBlue on topic Finding a source for CYRF6936 transceivers
Yep. Those would be ideal, but they don't seem to be available anymore

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10 Feb 2014 17:10 - 10 Feb 2014 18:58 #20087 by PhracturedBlue
Replied by PhracturedBlue on topic Finding a source for CYRF6936 transceivers
Well, It turns out that the AWA24S which is labeled as CYRF7936 is actually a CYRF6936 so this is likely the best bet right now (of course, I'm not sure it is available outside the US). It is powered off 3.3V which is a benefit over the Devo module as well.

I need to trace the circuit to figure out how it is connected, but here's the board:

Front:


(the 6 pin QFN chip is labeled as 'G5C')

Back:


G4C appears to be a CEL μPG2179TB SPDT RF switch:
www.cel.com/pdf/datasheets/upg2179tb.pdf

G5C appears to be a CEL µPG2250T5N:
www.cel.com/pdf/datasheets/upg2250t5n.pdf
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Last edit: 10 Feb 2014 18:58 by PhracturedBlue.

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10 Feb 2014 20:43 #20095 by PhracturedBlue
Replied by PhracturedBlue on topic Finding a source for CYRF6936 transceivers
Well, it appears the wiring in the AWA24S manual is accurate. the TxPA, RxPA, and PACTL pins are not connected to the CYRF chip. That is unfortunate but not unexpected. But now that I know it has a CYRF6936, it shouldn't be much work to get the board operational.

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10 Feb 2014 23:21 - 10 Feb 2014 23:23 #20106 by blackmoon
Replied by blackmoon on topic Finding a source for CYRF6936 transceivers
The cheapest way to get some modules is to gut older walkera tx for those who can put their hands on one.

240X series have a spi module without PA/LNA chip.

260X series have a spi module with PA/LNA chip.

apps.fcc.gov/oetcf/eas/reports/ViewExhib...75&fcc_id=S29WK-2601

I know it doesn't help much since the board is custom made, but for the diy guys, it's the cheapest.
Last edit: 10 Feb 2014 23:23 by blackmoon.

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10 Feb 2014 23:23 #20107 by PhracturedBlue
Replied by PhracturedBlue on topic Finding a source for CYRF6936 transceivers
None of these had telemetry, right? so LNA is likely disabled.

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10 Feb 2014 23:28 - 10 Feb 2014 23:32 #20108 by blackmoon
Replied by blackmoon on topic Finding a source for CYRF6936 transceivers
I see on the schematic LNAout from the PA chip hooked to the RFp pin on the cyrf6936.

Doesn't this mean it is capable but not implemented in the radio firmware ?

And yes none of them are telemetry enabled, not event the 2801pro was.
Last edit: 10 Feb 2014 23:32 by blackmoon.

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11 Feb 2014 00:11 #20111 by PhracturedBlue
Replied by PhracturedBlue on topic Finding a source for CYRF6936 transceivers
You are right. the 2601 seems to be wired to support a powered LNA as does the 2603 (I didn't check the others). the 2601 and 2603 have different pinout though. Supporting multiple variants would be challenging.

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11 Feb 2014 07:23 #20119 by blackmoon
Replied by blackmoon on topic Finding a source for CYRF6936 transceivers
I was hoping they would have kept the same pinout, you're right it doesn't pay off to support multiples pinouts. And I don't think that most people have a 260x tx on their shelf.

After all this module has to be (almost) simple plug and play :D

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25 Feb 2014 09:06 #20856 by silpstream
Replied by silpstream on topic Finding a source for CYRF6936 transceivers
Not sure if this helps cause it's in chinese, but I ordered from here:

jcmrf.taobao.com/?spm=2013.1.1000126.d3.ueUW3Q

Had to go through a 3rd party buying service, but managed to get hold of it.

Haven't don't anything with it yet though.

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25 Feb 2014 14:53 #20863 by PhracturedBlue
Replied by PhracturedBlue on topic Finding a source for CYRF6936 transceivers
This looks nice:
item.taobao.com/item.htm?spm=a1z10.1.w4-...enm1B&id=17895879213
about $9US for the same thing we get from Walkera (cyrf6936 + 212 Amp)
I went through setting up an account, but it appears they won't ship to the US

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25 Feb 2014 19:57 #20867 by silpstream
Replied by silpstream on topic Finding a source for CYRF6936 transceivers
I'm surprised you didn't pick the one with the PA instead. lol...

You'll need to search on google for a "taobao agent" that will send to the US. I live in Singapore and I used "65daigou.com". Unfortunately they don't ship to the US.

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26 Feb 2014 02:02 #20871 by PhracturedBlue
Replied by PhracturedBlue on topic Finding a source for CYRF6936 transceivers
sorry I pasted the wrong one. I meant the one with the PA:
item.taobao.com/item.htm?spm=a230r.1.14.1.5cwZOk&id=17797754621

How do I identify if the agent ships to the US? It is quite challenging to do via google-translate :)

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26 Feb 2014 03:19 - 26 Feb 2014 03:20 #20876 by SadSack
Replied by SadSack on topic Finding a source for CYRF6936 transceivers
I tried 'buychina.com' didn't get on so well. Still they have made some changes with there charges and looks like there up front ie: what you see you pay.

www.buychina.com/items/2-4g-module-cyrf6...m-module-uuruunslkhi

and in english
Last edit: 26 Feb 2014 03:20 by SadSack.

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26 Feb 2014 04:51 #20878 by PhracturedBlue
Replied by PhracturedBlue on topic Finding a source for CYRF6936 transceivers
Cool. I ordered 5, and we'll see how it goes. Looks like it is basically just an English interface to TaoBao. I don't actually need 5 of these things, so if they work, I'll probably pass along the others to interested members here.

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26 Feb 2014 05:16 #20880 by silpstream
Replied by silpstream on topic Finding a source for CYRF6936 transceivers
Glad to see you sorted it.

One note with these - Put it under and magnifying glass to check the solder joints before doing anything else. You may find you want to do a reflow if you see anything suspicious.

Can't wait to see what you have planned for it!

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26 Feb 2014 08:14 #20881 by SadSack
Replied by SadSack on topic Finding a source for CYRF6936 transceivers
Hope it works out for you and would be handy to use them in future but aliexpress.com You get to talk with sellers. This is the biggest issue I had with Buychina there charges where a lot more than sellers and asking for more money once I'd paid. End up with two lots of bank charges for one order.

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26 Feb 2014 19:09 #20899 by Hexperience
Replied by Hexperience on topic Finding a source for CYRF6936 transceivers

silpstream wrote: Can't wait to see what you have planned for it!


He's putting it in his Frsky Taranis radio with deviation firmware so he can use all the Walkera (and DSM) protocols.

So the only way to get Frsky to work in Deviation is to buy a new radio... :( Still hoping that all this leads to being able to use my Frsky Rx's with my devo12. ;)
There are 10 types of people in this world. Those that understand binary and those that don't.

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