Maximum range with A7105 and nRF24l01-PA modules

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18 Aug 2014 12:13 #25258 by hamsterrorist
I've been shifting pretty much everything RC-wise (air-based, surface machines have their own Tx units - separate, so more than one of us can enjoy at the same time :D ) to the Deviation route, with my Devo10 Tx.

I've got the A7105 module harvested from a V911 Tx, and a nRF24l01-PA module taken from the Tx of a JXD-388. Both work nicely with the current stable release, and I haven't experienced any issues (so far) with range, drop-outs, issues, etc.

But now i'm wanting to move my 450-sized quads this way also. They currently use stock Turnigy 9x-v2 Rx units with a 9x-v2 Tx. I'm a little worried that if I start using the Deviationed Devo10 for these that the range that I'll get won't be on par. I do have the Devo10 Rx unit spare for anything that needs, I guess, "safe" range.

So...what is the maximum range I should expect from the A7105 (Flysky) module for this use? The nRF module only controls the smaller stuff (Hisky, WLToys, etc) so i'm not so worried about those - they'd be out of LOS well before the radio range was exhausted, i'd expect.

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18 Aug 2014 13:28 #25259 by aMax
The module has no PA, so the range will be the same as with the V911 TX. But you can increase the range with a good modified antenna > dipol...
I would not use it with a 450 quad, buy at least a 7105-D03 module.

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

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19 Aug 2014 13:17 #25292 by hamsterrorist
Replied by hamsterrorist on topic Maximum range with A7105 and nRF24l01-PA modules
Sweet.

What kind of range would I expect with this module?

I found it on BG ( www.banggood.com/XL7105-D03-A7105-Modifi...Flysky-p-922603.html ) but without any antenna - what length/type would be required here?

And, i'm assuming it would use the same connections into the Devo10 as the standard 7105 module?

I may end up leaving the 450's under 9X control, although I do prefer the gimbals and overall flexibility of the Devo/Deviation setup...

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19 Aug 2014 16:15 - 19 Aug 2014 16:24 #25294 by aMax
I have this modul with the 31mm wire and I can tell you that it works with 3mW up to 200 meters. Calculate what it will be at nearly 100mW. ( 500 meters for shure.)

It nearly happend that i lost one of my V911 in gusty weather.
I could stear it left or right, but now way to go forward. After
some time the pixel had past all the properties of the neighborhood
and i shut the trottel and switched off the TX.
Later on, I found it into a corn field, still blinking to bind..;-) >240 meters away, messured with Google Maps.

Edit: The wiring is differend and depends on your software version.
Search " old" & "new wiring" & A7105-D03

Edit2: I have this one....
www.banggood.com/A7105-Wireless-RF-2_4GH...Module-p-909404.html

Devo7e, TaranisQ X7, R9M , 4in1 MM, Futaba FC18plusV3.2 & DFT/FLD-02
Last edit: 19 Aug 2014 16:24 by aMax.

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19 Aug 2014 23:22 #25299 by hamsterrorist
Replied by hamsterrorist on topic Maximum range with A7105 and nRF24l01-PA modules
Great, thanks for that. Looks like I can probably just use the wiring to the existing 7105 module I have installed and solder onto the new module, leaving the connections to the Tx board alone :)

The original V911 A7105 module i'm using has a Dipole antenna though - will using this D03 module with a monopole antenna cause any range/etc issues with the 9x receivers (which use dipoles)?

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