Devo 12s 3in1 / 4in1 RF module neat installation.

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06 Mar 2016 17:51 #44198 by SeByDocKy
Replied by SeByDocKy on topic 3in1 / 4in1 RF module

aMax wrote:

dc59 wrote: Did a range test again, after I connected LNAEN to VCC, all same power 3mw setting.
CC2500:
.........cut
A7105:
DEVO8S doesn't install A7105. Do not test.
DEVO10 + 3-in-1 : Flysky FS-GR3E(RC car receiver) 150M OK,150M~200M unstable, at 200M not totally lost signal,just unstable.
............cut

.

Just one note.
The A7105-500 does at 3mW more than 200m with ease.

I know this, because the year before last I nearly lost one of my V911 in strong wind
At estimated 230m I switched the transmitter off and let the heli drop . She was found at 265 m ( google maps measurement)



Yes but the RCcar reception sensitivity is lower versus a 5-10m high helicopter IMHO

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06 Mar 2016 19:00 #44201 by aMax
Replied by aMax on topic 3in1 / 4in1 RF module
Yes, you are right.
I know about the restricted signal transmission on ground level,
this was just an example for the original A7105 module to have a number in comparison to the mounted chip on the 3in1.

Devo7e, TaranisQ X7, R9M , 4in1 MM, Futaba FC18plusV3.2 & DFT/FLD-02

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07 Mar 2016 20:51 #44233 by dehalo
Replied by dehalo on topic 3in1 / 4in1 RF module

dc59 wrote: Let's discuss here.
old post

3-in-1 module product @ TaoBao
item.taobao.com/item.htm?spm=2013.1.0.0.EeDNND&id=27232304992

4-in-1 module & 4-in-1 PPM module product @ TaoBao
item.taobao.com/item.htm?spm=a1z10.3-c.w...yGZ0&id=526271178299


How do you get this web site to speak something else but Chinese?
Is there a Deviation version that works with these modules?

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07 Mar 2016 22:01 #44238 by victzh
Replied by victzh on topic 3in1 / 4in1 RF module
I use bhiner.com there are other intermediaries for taobao - see www.howtotao.com/best-taobao-agent-reviews/

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08 Mar 2016 03:13 #44242 by C0ckpitvue 777
Replied by C0ckpitvue 777 on topic 3in1 / 4in1 RF module
Will installing this 1 module give us all three modiules?How about if I use an 8s module for the 7e will this mod still be wired the same way?All fb is greatly appreciated?

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08 Mar 2016 03:32 #44243 by C0ckpitvue 777
Replied by C0ckpitvue 777 on topic 3in1 / 4in1 RF module
How much is the 4in 1 ? Need it for my 7e

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08 Mar 2016 08:09 #44248 by dc59
Replied by dc59 on topic 3in1 / 4in1 RF module

C0ckpitvue 777 wrote: Will installing this 1 module give us all three modiules?How about if I use an 8s module for the 7e will this mod still be wired the same way?All fb is greatly appreciated?


If you want to install 3in1 in your 7e , I will say it's OK,but not 4in1 module which has PE1/PE2 need to be confirm how to deal with.

How much is the 4in 1 ? Need it for my 7e


Original price on TaoBao :
3in1 = 150 RMB
4in1 = 200 RMB
4in1 with PPM module 250 RMB

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08 Mar 2016 12:53 #44256 by dc59
Replied by dc59 on topic 3in1 / 4in1 RF module
I finished DEVO 8S #3 RF module installation and confirm B3(pin 89) works fine as same as TomPeer has done few days ago.
and thanks for Richard96816 provided me soldering video, I just soldered it once and done.










enable-a7105 = B3
has_pa-a7105 = 1
enable-cc2500 = A13
has_pa-cc2500 = 1
enable-nrf24l01 = A14
has_pa-nrf24l01 = 1
Attachments:

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08 Mar 2016 14:13 #44258 by dc59
Replied by dc59 on topic 3in1 / 4in1 RF module
Update 2 informations from seller:
1, Next batch , you will no need to connect LNAEN pin to Vcc,they changed a resistor on 3in1 module to solved this problem.
2, It's out of stock again, because Banggood placed a order.

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08 Mar 2016 14:23 #44259 by SeByDocKy
Replied by SeByDocKy on topic 3in1 / 4in1 RF module

dc59 wrote: Update 2 informations from seller:
1, Next batch , you will no need to connect LNAEN pin to Vcc,they changed a resistor on 3in1 module to solved this problem.
2, It's out of stock again, because Banggood placed a order.


Yes I asked to BG to stock them :)))

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08 Mar 2016 15:00 #44262 by ColdBrew
Replied by ColdBrew on topic 3in1 / 4in1 RF module

SeByDocKy wrote:

dc59 wrote: Update 2 informations from seller:
1, Next batch , you will no need to connect LNAEN pin to Vcc,they changed a resistor on 3in1 module to solved this problem.
2, It's out of stock again, because Banggood placed a order.


Yes I asked to BG to stock them :)))


wow! that's great, so we don't have any trouble to order this module from taobao. i hope the price is still reasonable, and yess free shipping! :woohoo:

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08 Mar 2016 15:18 #44267 by mwm
Replied by mwm on topic 3in1 / 4in1 RF module
Which version will BG have?

Did you know that anyone with a bitbucket account (and you can log in with a google account) can edit the module installation instructions? Someone want to add the 3-in-1 module to the list supported modules page? And maybe update the transmitter installation pages to reflect how to connect a third module for their transmitters? Pictures are always good for these things?

Do not ask me questions via PM. Ask in the forums, where I'll answer if I can.

My remotely piloted vehicle ("drone") is a yacht.

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08 Mar 2016 20:30 #44280 by Fernandez
Replied by Fernandez on topic 3in1 / 4in1 RF module
Are we sure the lna pin must be connected permanetly vcc, I believe we did that in the past we did do it, but nowadays in deviation the lna and pa enable pins are controlled?

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08 Mar 2016 22:48 #44289 by hexfet
Replied by hexfet on topic 3in1 / 4in1 RF module
I think the cc2500 GIO pins can be used even if it's not the radio in use. Would be nice to have them connected, thought I think the main benefit is reduced power consumption.

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09 Mar 2016 01:21 #44298 by C0ckpitvue 777
Replied by C0ckpitvue 777 on topic 3in1 / 4in1 RF module
Thank you,is the rmb 0.15 of the usd? And which 3 modules are favorable for the 7e?I got an old 7e just sitting around but I removed the stock cyrf6936?My active 7e has the original cyrf w/out the diode mod and the a7105 and nfrl2401 both modded with sma cables for different antenna sizes.I would really like to have all 4 modules at full frequency strength.Any suggestions would greatly be appreciated by this noob,lol.

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09 Mar 2016 02:48 #44301 by dc59
Replied by dc59 on topic 3in1 / 4in1 RF module

mwm wrote: Which version will BG have?

Did you know that anyone with a bitbucket account (and you can log in with a google account) can edit the module installation instructions? Someone want to add the 3-in-1 module to the list supported modules page? And maybe update the transmitter installation pages to reflect how to connect a third module for their transmitters? Pictures are always good for these things?


I asked seller today, and got answer:
1, Previous 3in1 module, there is a 4K ohm resistor connected LNAEN to Vcc , New batch has changed from 4K to 1K resistor, Banggood will get new batch.(maybe Seby could help to check how does it work?)
2, "Some" 3in1 module CAN NOT connect LNAEN to Vcc directly , if you do it ,sometime you will not able to power on you TX. (I'm lucky.)

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09 Mar 2016 05:23 #44305 by FDR
Replied by FDR on topic 3in1 / 4in1 RF module
1. So you can replicate that change externally by connecting an additional 1K5 resistor between th LNAEN and Vcc
2. Do you know why is that?

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09 Mar 2016 08:21 - 09 Mar 2016 08:24 #44311 by midelic
Replied by midelic on topic 3in1 / 4in1 RF module
I think I may help you understand this.
See attached photos,As you see from logic for RX mode(X) doesn't matter if the pin is high or low.
So we can safely assume in both TX or RX mode the RXEN pin can be hight(connected to VCC)
So we can use only one pin TXEN connected to mcu to enable TX mode(TXEN high) or RX mode(TXEN low)....unless the chip PA/LNA is shutdown.

Now why is 1k pullup resistor?This coming again from data sheet.
See second pic.


Attachments:
Last edit: 09 Mar 2016 08:24 by midelic.

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09 Mar 2016 09:22 #44315 by FDR
Replied by FDR on topic 3in1 / 4in1 RF module
Well, I see that the recommended pull up resistor is 1K, but it doesn't necessariily mean, that the 4K resistor can't pull it up. It probably depends on the driving circuit you attach to that pin. I'm almost sure 4K can pull it up if nothing is connected, but of course it is always wise to use the recommended values.

However the chip lockup is still not clear to me.
The PA/LNA chis is a separate one, isn't it?
Does your upper table describe it's behaviour? Because the PA/LNA chip doesn't neep to be shut down, it can be always on, can't it?
I know it could be shut down in case of the PPM or USBHID protocols, but it only causes some waste of power if it is always on...

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09 Mar 2016 09:46 - 09 Mar 2016 10:01 #44316 by midelic
Replied by midelic on topic 3in1 / 4in1 RF module
PA/LNA is separate chip and this is how is working in any new 2.4GHz TX module.This table is from PA/LNA chip data sheet.According with deviation code you need PA/LNA shutdown when you reset chip(probably in other modes too) and change to other protocol on the fly.

But it is not big deal it can work like that anyway this is transmitter all protocols need PA working all the time so you don;t save much power.If you want to save power you can switch to RX and the current will drop almost 10 times.

int CC2500_Reset()
{
CC2500_Strobe(CC2500_SRES);
usleep(1000);
CC2500_SetTxRxMode(TXRX_OFF);//shutdown PA/LNA chip
return CC2500_ReadReg(CC2500_0E_FREQ1) == 0xC4;
}
Last edit: 09 Mar 2016 10:01 by midelic.

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