Antenna replacement Devo 7e

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12 Jun 2013 15:29 - 15 Jun 2013 18:20 #10856 by kicaj222
Antenna replacement Devo 7e was created by kicaj222
Hi i decided to do antenna mod, the donor was an old 54mbps router.
Mod was easy, as shown on the pictures, I didn't notice much range improvement, now is about 45 meters, where there was many wifi networks, Unfortunately i didn't check before mod, Tell me guys what is the range of stock devo 7e?

Next I'm going oto do shorted diode mod. Maybe that will help


edit, I removed shield and diode for better reach, and the range now is 130 meters at 10mW. I couldn't go further becouse end of the street, later i will report the range out of the city, at full power,

Edit, today i did range check, the result is surpassing for me, 1200m, i think it is a good result, could be better if the receiver was higher, the receiver is OrangeRx R910, i put it on my car,


you see a litte white dot? it is my car

Last edit: 15 Jun 2013 18:20 by kicaj222.

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12 Jun 2013 23:52 #10881 by RoGuE_StreaK
Replied by RoGuE_StreaK on topic Antenna replacement Devo 7e
You need to put the shield back on, it's there for a reason and doesn't affect the range.

There were discussions about antennas a while ago in the 7E thread, I believe the consensus from those in the know (not me) was that changing antenna doesn't give better range, and may in fact actually harm the range; something about needing matched impedance etc?

Did you bridge the diode or just remove it? Just removing it won't do anything, it needs to be bridged to provide a power supply for the power amplifier, which is disabled on the stock setup.

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13 Jun 2013 04:18 #10892 by FDR
Replied by FDR on topic Antenna replacement Devo 7e

RoGuE_StreaK wrote: Just removing it won't do anything, it needs to be bridged to provide a power supply for the power amplifier, which is disabled on the stock setup.

Actually the diode is there to shift a logical level to disable the power amp, it's not in the supply circuit...

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13 Jun 2013 11:56 #10922 by RandMental
Replied by RandMental on topic Antenna replacement Devo 7e
The major benefit of this antenna mod is not necessarily an increase in antenna gain (from the length it looks like a normal dipole config), but the fact that the antenna can now be bend up 90 degrees and perpendicular to the line of sight to the model.

Having the antenna perpendicular to the line of sight to the model ensures the maximum antenna gain in the direction of the model, this can easily increase the range 2-4 times compared to holding the Devo7e in the common near-horizontal position with its antenna pointing towards the model.

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13 Jun 2013 15:13 #10928 by kicaj222
Replied by kicaj222 on topic Antenna replacement Devo 7e

RoGuE_StreaK wrote: You need to put the shield back on,


What shield do you mean? i replaced an antenna and the coaxial cable too.

RoGuE_StreaK wrote: Did you bridge the diode or just remove it?

Yes i removed the diode and bridged it,

However i think 130 meters at 10mv is a good result,

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13 Jun 2013 15:29 - 13 Jun 2013 15:30 #10929 by RandMental
Replied by RandMental on topic Antenna replacement Devo 7e

kicaj222 wrote:
What shield do you mean? i replaced an antenna and the coaxial cable too.



The shield referred to is the metal can on the TX module which you had to remove to bridge the diode. This need to be replaced and re-soldered onto the PCB as it was originally.
Last edit: 13 Jun 2013 15:30 by RandMental.

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15 Jun 2013 18:02 #10993 by kicaj222
Replied by kicaj222 on topic Antenna replacement Devo 7e
Yes i put this shield back and soldered it,

quick update, today i did range test, see first post,

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15 Feb 2014 19:18 #20321 by Jman841
Replied by Jman841 on topic Antenna replacement Devo 7e
Did you cut the antenna yourself? or was it already set in the Wifi reciever? I believe if you are extending it it would have to be aprox. 62cm.

also, bending the antenna may reduce range as well.

Where did you get the longer antenna case? Is that a Devo 10 case?

Also, specifically how did you put that coaxial cable adapter on there?

I am interested but a little hesitant

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15 Feb 2014 19:25 #20323 by Jman841
Replied by Jman841 on topic Antenna replacement Devo 7e

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15 Feb 2014 21:37 - 15 Feb 2014 21:49 #20331 by domcars0
Replied by domcars0 on topic Antenna replacement Devo 7e
I've just put the antenna inside the shield, perpendicular to model direction, to have better range (please, don't care about the 0V and 3.3V notes).



Devo 10 (+7e) owner. It's mine, please don't touch it with your big fingers :angry:
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Last edit: 15 Feb 2014 21:49 by domcars0.

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16 Feb 2014 18:13 #20381 by Jman841
Replied by Jman841 on topic Antenna replacement Devo 7e
Did you range test this? Is there any interference because it is so close to the electronic boards?

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19 Feb 2014 08:14 #20575 by domcars0
Replied by domcars0 on topic Antenna replacement Devo 7e
I did not test range, but I know I've less issue with this mod and I can fly farther. From the model receiver RX point of view, there is no problem with the antenna proximity of electronics... there is may be issue with telemetry but I don't use it.

Devo 10 (+7e) owner. It's mine, please don't touch it with your big fingers :angry:

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07 May 2014 09:04 #22966 by smith
Replied by smith on topic Antenna replacement Devo 7e
How do I change the power output of the 7e on deviation 4.0.1? It is locked on 150mW

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27 Mar 2015 16:42 #30335 by 30secs
Replied by 30secs on topic Antenna replacement Devo 7e
kicaj222, great antenna mod!

I'm planning on installing the NRF module with the swivel antenna as the main one. Can you provide some more info on how about to do that? Sould i cut the top then slowly try to wedge the antenna base and continue to "shave" the plastic until it's a tight fit?

How did you do it?

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