DIY Antenna Booster for Phantom 3
- Thread starter PVFlyer
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N017RW
Premium Pilot
They're not diverse on the controller.
One is Tx the other is Rx.
Only the quad utilizes OFDM and MIMO for the LB downlink.
If the RC is one TX and one RX, then it's easy to break the wireless connection if we put a 50 ohm terminator on either of the 2 MMCX connector on the RC. Moreover, if we add a reflector on either antenna, it wouldn't help to boost the range much but that seems not the case.
I believe RC is also MIMO. DJI wouldn't be that stupid to put MIMO on the quad alone, and leave the RC on SISO. Otherwise, it would sacrifice most of MIMO benefits IMHO.
N017RW
Premium Pilot
I'm sorry we won't agree PVFlyer.
That's OK. I'm not on a mission to convince everyone but hopefully others will be curious and investigate for themselves.
The truth lies in the FB marketing you quoted previously (i.e. MIMO downlink, etc.) as well as the FCC required testing data and Grant info. which can be found on the FCC site.
The P3 P&A are clearly identified as MIMO type devices in their FCC Grants while the hand-held controller is not.
Maybe someone more familiar with LB can chime in in the future and add something to help clear this up since I am not successful.
That's OK. I'm not on a mission to convince everyone but hopefully others will be curious and investigate for themselves.
The truth lies in the FB marketing you quoted previously (i.e. MIMO downlink, etc.) as well as the FCC required testing data and Grant info. which can be found on the FCC site.
The P3 P&A are clearly identified as MIMO type devices in their FCC Grants while the hand-held controller is not.
Maybe someone more familiar with LB can chime in in the future and add something to help clear this up since I am not successful.
David,
Any chance you would share the .stl file so members with a 3D printer could print their own?
This mod is awesome and I would really love to print one out!
Thanks!
Jovack
Any chance you would share the .stl file so members with a 3D printer could print their own?
This mod is awesome and I would really love to print one out!
Thanks!
Jovack
N017RW
Premium Pilot
All four antennas transmit as the FCC test data confirms this but I can't confirm they all receive as well.
The testing only incorporates radiation.
The testing only incorporates radiation.
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The FCC document for the remote controller testing is: https://fccid.io/document.php?id=2535091
On page 7 it states:
Antenna Connector Construction
The EUT has an integral dipole antenna arrangement for transmitting, the antenna gain is 3.5dBi @ 2.4G Band, and another antenna only for receiving, fulfill the requirement of the item. Please refer to the internal photos. Result: Compliance.
Unless the design changed after the FCC testing, one antenna transmits, and one receives. Does anyone interpret the FCC document differently?
On page 7 it states:
Antenna Connector Construction
The EUT has an integral dipole antenna arrangement for transmitting, the antenna gain is 3.5dBi @ 2.4G Band, and another antenna only for receiving, fulfill the requirement of the item. Please refer to the internal photos. Result: Compliance.
Unless the design changed after the FCC testing, one antenna transmits, and one receives. Does anyone interpret the FCC document differently?
This one comes from Hong Kong. David's come from the US and cost $1 less. David has been really responsive to this forum so I'm sure his customer service, if needed, will be excellent.
:harry
Love your product................... but no way in hell I'm getting nekkid with you!!
Correct, both the Phantom and the Radio are MIMO. Both antennas Receive and Transmit.
With that said,why does it affect signal? When I turn around(face the P3 toward the controller ) I get full bars again
N017RW
Premium Pilot
Now why would he want to do that? I'm sure he has plenty of time invested in creating the drawing on computer so he could profit by his hard work. Posting the file on the internet could and probably would severely take away potential profits from his wallet.
I know I wouldn't be willing to do that.....
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I used to work with an engineer, his motto in life was "Knowledge is power"
Ironic that most of his knowledge was given to him by other people.
I used to work with an engineer, his motto in life was "Knowledge is power"
Ironic that most of his knowledge was given to him by other people.
Okay. So that means I give out knowledge to give someone else the potential probability of having more power than myself?
Ummm, no thanks.
It is very common for communities like this to share designs. Take a look at thingiverse.com, etc. It does not hurt to ask. I totally understand that he has time invested. I too have created/designed items that have been posted for all to use.
Now a request for the file by someone that wants to compete and print for sale would be another story.
At any rate, I have communicated with David and we are all set.
Thank you!
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I have a different philosophy. It is a difference between engineers and scientists. Scientists believe the community as a whole benefits from the exchange of ideas and information. Engineers do not agree with that approach and if they don't know or can't get the information from a scientist, they simply approximate what they don't know with the equation for a sphere.
Lol
It's not the recipe for coca-cola were dealing with here..lol If one were so inclined, they could look at the picture, pull out a pair of calipers, take some measurements off their TX and create their own stl in no time. We're not trying to nail Jello to a tree here.
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