Jumper T8SG - First TX stock running on Deviation

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06 Sep 2017 13:17 #64236 by vlad_vy
Replied by vlad_vy on topic New TX from Banggood
dc59, what do you think about LCD contrast? Is it enough? Now contrast can be changed from 0 to 10 (Tx settings), but LCD chip can use values from 0 to 63.

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06 Sep 2017 13:37 #64238 by dc59
Replied by dc59 on topic New TX from Banggood

vlad_vy wrote: dc59, what do you think about LCD contrast? Is it enough? Now contrast can be changed from 0 to 10 (Tx settings), but LCD chip can use values from 0 to 63.


I think 0 to 10 contrast setting is good enough, but it's backlight design is bad, you can find all my LCD pictures have 2 light spot at bottom side, light uniformity is very poor!:(

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06 Sep 2017 16:15 - 06 Sep 2017 16:16 #64240 by aMax
Replied by aMax on topic New TX from Banggood
Is this size comparison real? Quite a big radio.

img09.banggood.com/forum_images/20170906...0906035921_53229.jpg

Devo7e, TaranisQ X7, R9M , 4in1 MM, Futaba FC18plusV3.2 & DFT/FLD-02
Last edit: 06 Sep 2017 16:16 by aMax.

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06 Sep 2017 16:29 #64242 by robocog
Replied by robocog on topic New TX from Banggood
Wonder if they would consider selling just the board and screen for those of us wanting to make an ultimate TX out of older technology or those that want to tinker with size and layout formats

Watching this thread with much interest

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06 Sep 2017 17:00 #64244 by Sero
Replied by Sero on topic New TX from Banggood
It is the same size as the little Devos, i.E. the 7e, so it is rather small.

No idea if the other TXs on that picture are as small as that.

A day without flying can't be called a day.

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06 Sep 2017 17:34 - 06 Sep 2017 17:44 #64245 by Brainstorm
Replied by Brainstorm on topic New TX from Banggood

dc59 wrote: #1 TX is final version of T8SG , #2 & #3 are different model and different price .............. :P
But I don't thing Banggood can sale final version of T8SG in this month because hall sensor gimbal has not been produced and tested yet.


Thanks for clarifying, dc59. If Jumper can give us a Deviation-based, multi-protocol, compact TX with hall sensor gimbals for the pre-order price of $90-100, that will be incredible! :woohoo:

ajtank wrote: It is great to have a transmitter customized for Deviation. Whilst every parent got different expectations for a new born baby, all thoughts must be realistic and justified.

$99 for Jumper's existing version seems on the high side to me when I look at the price for Devo 7e and Devo 10. Recently the legendary Frsky Taranis transmitter has also hit the $170 price point. Let's see how Jumper can emerge successfully from the market.


ajtank: Well said about parents' expectations for a new baby. ;)

As for price, remember that the T8SG will come with four (4!) RF modules built in! While Devo 7e is very affordable, you have to spend $40 extra for a 4-in-1 RF module, plus more for upgrades like 3-position switches and removable antenna. So I think the current $100 price for the T8SG remains quite attractive, especially if it ships with improved gimbals.
Last edit: 06 Sep 2017 17:44 by Brainstorm. Reason: formatting and quotes

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06 Sep 2017 17:49 - 06 Sep 2017 17:50 #64246 by Brainstorm
Replied by Brainstorm on topic New TX from Banggood

aMax wrote: Is this size comparison real? Quite a big radio.

img09.banggood.com/forum_images/20170906...0906035921_53229.jpg


aMax: That size comparison is an inaccurate photo montage. The picture below offers a better comparison with the compact Devo 7e, which is much smaller than Taranis X9D+ and QX7.

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Last edit: 06 Sep 2017 17:50 by Brainstorm.

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06 Sep 2017 19:09 #64247 by Moeder
Replied by Moeder on topic New TX from Banggood
Ok, this won't work. Both display drivers only allow write access when connected via SPI...We have to find something else for this to work.

Querying the memory chip seems a possibility, as probably a devo7e-256 won't change his flash memory. Or we stick with the simplest option and define display inversion in hardware.ini, as this file has to be custom for the tx anyways, as it needs to be modified from it's default values to define switch setup and 4-in-1 connections.

Moeder wrote: I was scanning through the data sheets for both UC1705 and NT7538 and noticed, that the behavior of the status register "enable" (or ON/OFF) when read out seems inverted between the two drivers. This could be used to differentiate between the two displays.

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06 Sep 2017 19:15 #64249 by FDR
Replied by FDR on topic New TX from Banggood
I would choose the hardware.ini way...

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06 Sep 2017 19:51 #64251 by PhracturedBlue
Replied by PhracturedBlue on topic New TX from Banggood
I think we can wait until the developers have them in hand. It isn't like there is a race to get this done. Let's see what options we have once we can check the hardware. As I mentioned previously, I think we'll probably need a new target anyway, and if we want to embrace this Tx and recommend it (which I would like to see it 1st before saying that), then having a target dedicated to it will be less confusing for end-users and also indirectly show our support.

I just don't want to go too fast, since I don't want to create a target and then remove it later.

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06 Sep 2017 19:57 #64253 by FDR
Replied by FDR on topic New TX from Banggood
I agree, I just made my voice because I think the hardware.ini is the way to go in general for other reasons too, like the custom hw builds.
There was a case, when Walkera itself made a display hw change, but that you could handle with auto hw detection...

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06 Sep 2017 23:48 #64254 by dc59
Replied by dc59 on topic New TX from Banggood

aMax wrote: Is this size comparison real? Quite a big radio.

img09.banggood.com/forum_images/20170906...0906035921_53229.jpg


Compare to Frsky QX7 & X9D+ :
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07 Sep 2017 02:47 #64257 by dc59
Replied by dc59 on topic New TX from Banggood
Jumper want to use unused MCU pin to control 4-in-1 module antenna switch (PE1/PE2) ,
they think it would be more stable for all system , they can change PCB layout no problem ,
but it's need firmware support !
BTW, Which pins are suitable for PE1/PE2 ? any suggestion ?

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07 Sep 2017 04:16 #64258 by RoGuE_StreaK
Replied by RoGuE_StreaK on topic New TX from Banggood
Does the 4-in-1 module they are using have an onboard MCU that could handle that via the Chip Select, or don't they have access to the module production? Or doesn't the onboard MCU have enough spare pins?

I don't know what the chip select lines look like (never installed a module), but I'm guessing it could also be done with a simple logic switch chip driven by these lines?
statusPE1PE2
A7105 RF signal to antenna00
CC2500 RF signal to antenna01
NRF24L01 RF signal to antenna10
CYRF6936 RF signal to antenna11

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07 Sep 2017 04:21 - 07 Sep 2017 04:48 #64259 by FDR
Replied by FDR on topic New TX from Banggood
No, I think it's not that, but switching on/off the power and the input amplifier...
I might be wrong...
Last edit: 07 Sep 2017 04:48 by FDR.

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07 Sep 2017 04:29 - 07 Sep 2017 04:35 #64260 by vlad_vy
Replied by vlad_vy on topic New TX from Banggood
Devo 4in1 module has chip select lines routed to simple logic switch chip with two outputs routed to PE1 and PE2.

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Last edit: 07 Sep 2017 04:35 by vlad_vy.

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07 Sep 2017 05:12 - 07 Sep 2017 05:20 #64261 by RoGuE_StreaK
Replied by RoGuE_StreaK on topic New TX from Banggood
The above was found as a reference in the standalone multimodule, here's an example:
Multiprotocol module (Flysky Frsky Devo DSM2)
That was the only place I found that referenced seperate controls for PE1 / PE2, so maybe they are using a partial board from this? Actually, the pins on the shielded module part look identical to the ones shown on the TX board here... vlad, any info on which logic chip is used?
EDIT: OK looks like they both use the same shielded module, but the logic chip is external to it, so would just need to be added to the TX board

have I proven my worth yet for a freebie?
Last edit: 07 Sep 2017 05:20 by RoGuE_StreaK.

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07 Sep 2017 05:24 - 07 Sep 2017 05:46 #64262 by vlad_vy
Replied by vlad_vy on topic New TX from Banggood
I don't know the chip, marking is scraped off on all Devo 4in1 modules. The same thing for 4-way RF switch inside 4in1 module.
Last edit: 07 Sep 2017 05:46 by vlad_vy.

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07 Sep 2017 05:58 - 07 Sep 2017 06:53 #64263 by ajtank
Replied by ajtank on topic New TX from Banggood
The chip is actually a STC MCU determining the traffic of the RF switch.
Last edit: 07 Sep 2017 06:53 by ajtank.

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07 Sep 2017 06:05 #64264 by SeByDocKy
Replied by SeByDocKy on topic New TX from Banggood
Damned BG just canceled the order I had saying they can ship it to France :( :( ;...

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