spartan2381
Member
Does anyone know if the DJI waypoint hards uses SMA or RP-SMA connector? The manual says SMA but I know when dealing with say a Foxtech hardware I need to use a RP-SMA antenna and was wondering if its the same with DJI.
DJI Waypoint Antenna
- Thread starter spartan2381
- Start date
spartan2381
Member
I live in the US. I want to change to a clover leaf antenna for better range.
ChrisViperM
Active Member
I tried a standard SMA Cloverleaf on the DJI-Data Link....didn't mach. Have to try something else once I am home....
Chris
Chris
gtranquilla
RadioActive
The radio industry switched over to RP (reverse polarity SMA antenna connector a couple of years ago.... probably an attempt to stop novices from extending unlicensed systems beyond their legal range/watts output).
My 5.8Ghz DJI video downlink transmitter has the original, standard, SMA connector which matches most currently available cloverleaf antennas such as FatShark.
But for my dual diversity FPV monitor I had to buy one RP-SMA adapter to attach the ground cloverleaf antenna.
Radio specialty shops such as MRO and most electronic wholesalers sell these for about $2.00 each.
My 5.8Ghz DJI video downlink transmitter has the original, standard, SMA connector which matches most currently available cloverleaf antennas such as FatShark.
But for my dual diversity FPV monitor I had to buy one RP-SMA adapter to attach the ground cloverleaf antenna.
Radio specialty shops such as MRO and most electronic wholesalers sell these for about $2.00 each.
ChrisViperM
Active Member
That might be the reason why the the standard SMA fits on your Data-Link and not on mine.....I got the 900 Mhz version, and there it definitely doesn't fit. I forgot about this thread and didn't try other connectors, but will give it a try tonight.
Chris
gtranquilla
RadioActive
My DJI 900Mhz datalink system came with the matching antennas for both radios which are the conventional SMA connectors and are specifically matched for 900Mhz frequencies..... Use of another antenna for a different frequency range, e.g., 2.4 or 5.8Ghz could damage the output rf section of a transmitting radio due to impedance mismatching and/or severely limit the radio system range during operation.
ChrisViperM
Active Member
Wrong....
SMA = thread outside - center female (male female part of connector)
thread inside - center male (female part of connector)
RP-SMA = thread outside - center male (male female part of connector)
thread inside - center female (female part of connector)
Base for definitions: http://en.wikipedia.org/wiki/SMA_connector
This picture is the 900Mhz DataLink = RP-SMA :
This applies for both antennas (Tx and Rx)
Can be replaced with this: http://www.readymaderc.com/store/index.php?main_page=product_info&products_id=801
This picture is the 2.4Ghz DataLink = SMA :
The 2.4Ghz comes only with one detachable antenna for the ground unit, the air-unit got a built-in antenna
As a reference, this is a Fatshark with a matching Cloverleaf antenna, which without any doubt is SMA:
Chris
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PeterLester
Member
Chris, you are most likely correct but please note that most of your posting links are not working properly (will not open images).
ChrisViperM
Active Member
Mhhhhm.....will try to correct that.
Chris
Chris
spartan2381
Member
This all is great information. Question: Is there any benefit with replacing the 2.4Ghz stock antenna with a cloverleaf or some other antenna configuration?
gtranquilla
RadioActive
For the 900Mhz Datalink the advertised range is around 10 kilometers LOS. But if you add a higher gain antenna at the ground location and keep it high and/or on high ground, you should be able to get 15 km or more. Technically that may be illegal to increase gain by means of a higher dB antenna and they reverse the polarity of these antenna coax connector to discourage such modification. But you can still pick up a RP-SMA connector to do it anyway. It has been awhile since I used it so I don't know if there is an RSSI indicator at the Ground station end....... if so it would indicate between 0 and 100% (not distance).
gtranquilla
RadioActive
Yagi antennas come in various dB gain configurations and are highly directional so as to increase reception range if you know where to aim it. And there are other types of directional antenna arrays as well...... Just talk to a HAM radio operator.
fj_montilla
Member
I've been somewhat frustrated with my FPV setup. I have a DJI 5.8ghz TX/RX, with BlueBeam Ultra Cloverleaf Antennas which have better TX/RX than the stock DJI cloverleafs, according to a few tests at ground level. The receiver connects to a FoxTech 7in Monitor via NTSC composite. I get video alright, however as soon as I get around 200ft in the air, my video gets garbled. I've been thinking about getting a 5.8ghz 16dbi patch antenna on the receiver side to see if I can see some video from a reasonable altitude. Any similar experiences out there? Or any 5.8 patch antenna users? Whats the scoop?
PeterLester
Member
I am using the DJI 5.8Ghz FPV transmitter along with a dual diversity FPV TFT display as well as Fatshark cloverleaf, one on the Tx and one on the FPV receiver (left-hand side) the other is the standard omni. I get good reception for about 500 feet and beyond with occassional breakups on the screen after that. Dual diversity seem to help a lot.
kloner
Aerial DP
considering the 2.4 air module has built in fixed linear polarized antennas the best way to make this extend range would be to use linear patch antennas like this
http://team-blacksheep.com/products/prod:tbs_yagi
they are directional so it adds to the complexity but will triple the range if not more..... check the sma connector to make sure it matches, otehrwise get an adapter or new end that matches the dji ground connection
http://team-blacksheep.com/products/prod:tbs_yagi
they are directional so it adds to the complexity but will triple the range if not more..... check the sma connector to make sure it matches, otehrwise get an adapter or new end that matches the dji ground connection
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I think you meant linear polarized antenna. I just wanted to know if it would work. Technically you can use circular polarized antenna with linear polarized, but you just don't get the full effects. It should work in theory, it is not an RP-SMA connector on the 2.4 GHz. Only the 900. I do have adapters though.
kloner
Aerial DP
no, up until the magic mushroom mixing the two went from signal to no signal in a heartbeat, with matching polarity you get degraded levels into static at worst, not total loss of signal.... you want to match the polarity with any type of patch antenna you can get... there cheap, work amazing