Board shots for sj x300-2

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11 Mar 2016 20:23 #44443 by C0ckpitvue 777
Board shots for sj x300-2 was created by C0ckpitvue 777
This little wind cutter is a beast with the toy grade stock tx,I wll be attempting capture for the first time.I hope a guru takes interest in this bird to get it deviated aviated,all helpful feedback is welcomed for this first time capture.Here are the guts of the stock tx.






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12 Mar 2016 20:07 #44478 by victzh
Replied by victzh on topic Board shots for sj x300-2
The most interesting part of the board for the purposes of reverse engineering is the radio chip - the one closest to antenna. It is not sufficiently detailed on your photos to tell anything useful. Also, this forum has limitation on the size of the photos, so it's advisable to put them elsewhere and publish links here.

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12 Mar 2016 21:35 #44481 by C0ckpitvue 777
Replied by C0ckpitvue 777 on topic Board shots for sj x300-2
Thanks for the feedback,unfortunately this capture will be delayed do to my botched soldering,lol.Thank God this tx is only 7,78 used @ gearbest waiting for 2 to arrive. Sorry about the space with the photos just opened a media fire acct will upload and linkt there,Thanks again.

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15 Mar 2016 11:03 #44591 by goebish
Replied by goebish on topic Board shots for sj x300-2
At first glance, looking at the size / pin count / very few passives around the RF chip I'd say this is a LT8900/8910, but I could be wrong ...

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16 Mar 2016 00:09 #44621 by C0ckpitvue 777
Replied by C0ckpitvue 777 on topic Board shots for sj x300-2
Is this a good thing?

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16 Mar 2016 10:15 - 16 Mar 2016 10:21 #44637 by goebish
Replied by goebish on topic Board shots for sj x300-2
Not really, well, some work has been done recently by planger to be able to emulate the LT8900 with a nrf24l01 but it's not implemented in deviation yet, and if it is a LT8910 maybe it's using a bitrate that's non compatible with the nrf24l01.

Can you look under the crystal to confirm it's a LT8900/8910 ?
Last edit: 16 Mar 2016 10:21 by goebish.

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16 Mar 2016 21:21 #44671 by C0ckpitvue 777
Replied by C0ckpitvue 777 on topic Board shots for sj x300-2
Hey Goebish,I got frustrated after badly butchering the solder job I threw it in the trash.I order 2 from gearbest soon as they appear,I will take that pic.

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17 Mar 2016 03:15 #44691 by victzh
Replied by victzh on topic Board shots for sj x300-2
Come on, man. I soldered so many things, but only today desoldering an antenna from Radiolink AT9 - no other way to disassemble it fully - I tore off a thin trace leading to this antenna. I was fortunate to be able to solder directly to the small part, but it happens all the time, nothing to be ashamed of or frustrated. Things break, especially in this hobby ;-)

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18 Mar 2016 01:37 #44761 by C0ckpitvue 777
Replied by C0ckpitvue 777 on topic Board shots for sj x300-2
Thanks for the words of encouragement,you're so right.I went through, 3 xl7105 modules and 1 devo 7E before I got it right,lol but in the end it definitely paid off for much fun as my compensation.I ordered 2 more tx from gb,crossing my fingers.I wish banggood sold them,this is such a good flyer.

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