This is an interesting look into REMOTE ID and how official organizations can use these tools to secure their operations airspace very easily. It's also really scary as to how easy you can be found as the pilot of something like your consumer DJI drone :)
New test setup: DJI Airunit on Tripod moving away (2.3km) with DJI Goggles and compare achived BITRATES.
I tested with 2 different powersettings (25 and 200mw) and was surprised that even with Stock antennas you could get a connection at 2.3km thru the fog!
- good line of sight (low fresnell zone intersection)
- big time fog!!! (reduces range about 50%?)
- AirUnit got constant 12v power (thru powersupply which was switchable)
- Maple Wireless L+RHCP TX Antennas (look pretty similar to DJI Stock)
Tested antennas (use the jumpmarks to find what you're curious for):
MapleWireless, Deathray 3Turn, 7Turn
DJI Stock, TrueRC Singularity, Foxeer Lollipop
►NEW!: iFlight ChrystalHD https://bit.ly/2ILRKDT
MapleWireless: 4 patches for DJI with left+right polarization? Does it help?
How much better do they work, when you use L+R on the copter?
I also compare Stock vs. TrueRC Singularity vs Foxeer Lollipop.
To do such tests yourself, just use my little script to convert SRT files into excel understandable format, then use my Excel-Sheet to import those and get nice charts automatically. It's what I used here, if you do compareable flights the data can be pretty accurate!
MapleWireless: 4 patches for DJI with left+right polarization? Does it help?
How much better do they work, when you use L+R on the copter?
I also compare Stock vs. TrueRC Singularity vs Foxeer Lollipop.
To do such tests yourself, just use my little script to convert SRT files into excel understandable format, then use my Excel-Sheet to import those and get nice charts automatically. It's what I used here, if you do compareable flights the data can be pretty accurate!
Links to products and script / XLS down in the links section!
Please 👍 and 🔔 thanks ;-) it helps a lot! Find many links and infos further down!
I DONT earn money with affiliate links - I'm not a sales guy, here you get HONEST reviews and opinions. If you wanna support me, watch, share or even become a patron: https://bit.ly/2ESMtIO
●▬▬▬LINKS▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬●
See the data of this test (XLS sheet) here: https://bit.ly/3kIE4b3
DJI SRT converter, Excel macro to make your own tests:
SRT to CSV script: https://bit.ly/2GNvZTo
Excel sheet: https://bit.ly/3iKdlch
►HENRIK's "Death Ray" Helicals
To order or for questions, please email: henrikjaderstrom84@gmail.com
►Maple Wireless Patches (were not shown at their full potential in this vid)
can be ordered at banggood: https://ban.ggood.vip/VD3Y (code: BGOOYFG, 15%off)their 13.3km flight: https://youtu.be/xILiTkVVkao
►TrueRC Stubbies were provided by germany based Shop FPV24.de: https://bit.ly/33MsV2I
they are 85€ which seems quite pricey, but they work really well!
Good discussion on RCGroups (not because I started it, but because of Deamon):https://www.rcgroups.com/forums/showthread.php?3710715-DJI-FPV-Goggles-which-antennas●▬▬▬VIDEO INDEX▬▬▬▬▬▬▬▬▬▬▬▬●
00:00 Intro
01:10 the Setup
01:50 TEST1: 3Turn Helical
02:34 MapleWireless mini Review
04:22 RPSMA
04:52 TEST2: MapleWireless Patches
06:07 TEST3: TrueRC Singularities
07:35 TEST4: allStock
08:18 TEST5: all Fox Lollies
09:49 TrueRC again
10:49 discuss my chart-data
17:35 final thoughts
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#DJIFPV#Antennas#test
Here's my take on practical antenna-testing for DJI FPV goggles.
A lot of DJI users ask me, "which antenna should I use for decent range?".
Stock DJI Antennas (in the air and on your goggles) are ok, but with the cheapest of options you can gain way better results. I swap the air units antennas for RHCP so I can use all my normal 5.8 antennas that I collected over the years. (DJI antennas are not really different from what we used in the analog world).
On the AirUnit you need: mmcx RHCP antennas (if RHCP is what you use on goggles).
I use either Speedybee or Foxeer Lollipop mmcx antennas.
Caddx Vista: attention - here you need "UFL" connector instead of mmcx!
Foxeer Lollipop stubbies would be very convenient, but my previous measurements indicate that they are especially weak "overhead" (in the antenna null).
Normal Lollipop (the ones with coax cable) are relativly small and have good performance.
2 of them cost around 20$ currently on banggood - so for 40$ you can have the goggles fitted with new antennas, if you dont already have these from analog times...
Watch out - you also need RP SMA to SMA adaptors!
Longrange combo:
2 omnis (the said Lollipop) on top (yes, on top - they look like horns there as well)
2 patches on the bottom ports (if possible use an 45° adaptor to point them straight or even up a bit!)
In this video you see how much of a difference you can expect between already tuned Lollis and the Patch combo. Since I now have GPS RTH safety, I can almost go to the edge of my reception.
With the SG325 iNav copter here I have the luxury of an SD card for blackbox logging - and therefore I get good GPS data (check Pawels tutorial on how to convert blackbox logs to GPX files for google earth: https://www.youtube.com/watch?v=GEGywqPD2Uk).
And with my little script (https://youtu.be/s0Y-P3RrMDI ) I can convert the subtitles (SRT) from the goggles to Excel files and make nice charts which show you the bitrate over time rather then just the number overlay. That makes it much easier to judge the performance over the whole flight.
SRT to CSV converter script: https://bit.ly/2Zr9Gs6
Test setup:
25mw, current firmware (as of 16.9.2020)
50mbit mode, high quality
SpeedyBee Antenna on Caddx Vista
Crossfire for control link
Standing next to a road free LOS to the fiel, nothing blocks my view to the copter.
"fly as long as you feel comfortable" - I returned when bitrate dropped below 5mbit too often.
Summer, low humidity, 28° all flights around 5min from each other.
Today I wondered how the Caddx Vista antennas look inside. Couldn't find the info online, so I opend one up myself. Before I knew what happend, a lot of poor little antennas were mangled brutally and I needed to find an excuse for the slaughtery. "That's for a video" I tried to convince myself...
I use 1mW on the transmitter, 10m distance to a VERY SENSITIVE receiver (Aaronia Spectran HF6065 -150dB! and take enough samples to get an average.
I measure antennas in their best orientation (vertical for omnis) and the worst (antenna null point "above" the omni antenna).
Fun fact:
As my test suggests that Lollipop 1 is better than 2 and 3, here I read that Lolli1 was PCB style (like Lumenier AXII) and 2 was spw style. That explains why the Lolli1 was their best antenna - because they cloned a good one :)
So the other day I was wondering if I could test analog vs. digital on the same platform (RC car). DJI goggles influence the analog reception a bit - but it worked.
Quick and easy solution was to strap on a little DJI FPV copter on my RCCar and drive around carefully with both video signals recording.
Both set to 25mw with same antennas.
Here I try to compare analog vs. Digital, on a car (low to the ground is always a challenge for RF). With a car you can drive beyound video range without crashing!
That being said, even with lowest power (25mw) the DJI FPV feed didnt break up completley when I drove down in the garage, behind LOS with lots of metal objects.
See the DJI OSD data (Bitrate and Signal) and how ImmersionRC 25mw VTX combined with Immersions Rapidfire compares to this…
TIPP: If you like the DJI OSD overlay in my video: download this script which will "re-format" the subtitle file. For nicer playback and only displaying of important infos. I have a few different versions of this re-formatter...
To simply playback the DJI files with OSD on your computer use "VideoLan Client" Player (free software) - it will display the SRT (subtitles) in realtime.
If you want to use this in a video editor - it's a bit more work. If there is enough demand I will make a little tutorial... (Hint: you need the free X-Media Recode)
Furadi show's how he can fly a spot with DJI which was almost impossible with analog (due to heavy multipathing there):
That's a long video, USE the Jumpmarks in my VIDEO INDEX below for easier access to what matters to you. Grab some popcorn and whatch the whole thing if you've got time :)
If you're curious about how to CONVERT DJI SRT files to be useable in Excel, find the script here on a google drive: https://bit.ly/2waB7vD
There's also the FULL XLS Sheet I used in this review, check out the data in detail there.
I've included a 2nd SRT converter script there to re-format those SRTs for the essential infos (VOLT + Latency + Bitrate). If you want to get a tutorial how to overlay the data in a video (as I have here) let me know. If there's enough interest in it I'll do a tut...
While some of those links are affiliation links I dont earn money here (it's the banggood contact who tracks sales) - I'm not a sales guy, here you get HONEST reviews and opinions.
I'm kinda biased tho if you send me a Baseball cap or a shirt ;)
you can buy it here: https://goo.gl/ozpqod
Banggood sent me something for review! Again! They didnt blacklist me after my EV100 review :) And this product here is actually quite good! Check out my charger review if you are looking for a convenient way to send some juice into your packs.
!DISCLAIMER! - VENDOR/SHOP sent me this product for review
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VIDEO INDEX:
00:43 compared to other chargers (SIZE)
00:50 ULTRAPOWER UP400
01:58 What's this for? Miniquad Batteries! :)
02:43 no external powersupply - really small package!
03:03 CONNECTORS (XH and XT60)
03:42 AC Power
04:03 tiny brother for mobile use...
05:27 TIP: use the little ISDT to empty your batts for storage!
06:11 CHARGING batteries - what do we see?
06:55 downside: the scrollwhell isnt perfect
07:34 supported BATTERY types
10:39 LOOK and FEEL
11:43 final thoughts
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I took a closer look at the claimed better latency here. Check my new method - I like how it visualizes the time-delay...
The cam is really good. Image is one of the best currently available, only the missing OSD Volt option is a small downside.
At the end you'll find a comparison with different cams - check my VIDEO INDEX:
===========
02:12 latency Eagle2
04:14 Eagle1 compared (how much fast is Eagle2?)
07:34 Swift Mini Latency
09:05 SUMMIT (about Eagle2)
09:46 Runcam Split Latency, Split thoughts
11:53 Eagle 2 Downsides no OSD
12:33 Eagle 2 positive: very nice imagequality!
12:49 more FLIGHT FOOTAGE
14:25 even MORE FOOTAGE ( MINI Swift, HS1177, EAGLE1 and 2, Foxeer MONSTER V2
16:22 Runcam SPLIT DVR Footage (some of you asked!)
Video index:
==========
01:31 std. antenna (linear)
03:16 std. ant. multipathing test
03:56 AOMWay SPW
06:22 AomWay multipathing
07:09 TBS Triumph
09:01 Triumph multipathing
10:02 PAGODA
11:47 Pagoda multipathing
12:49 Range test with 30db ATTENUATOR
13:41 Atti and Std. Antenna
14:39 switch to AOMWay
16:05 switch to TBS Triumph
17:14 switch to Pagoda
19:14 Atti+std.Antenna and 2xPagoda on Goggles VRX
21:15 CONCLUSION
24:20 -- 4 antennas DIRECT COMPARISON footag!!! --
Multipathing:
When the video transmitter (the copter here) emits the RF signal - it goes straight to your receiver (line of sight!) and also gets reflected off some obstacles (like the big building here).
The reflections do arrive at the receiver slightly later (longer way) so the RF waves (direct and reflected ones) will either "add up" or "null out" each other. Interference occurs and distorts your video image.
Circular polarization helps here, because the reflected signal will be "filtered away" almost completely.
I got this from Hobbyking (get it here) for testing. Found it interesting and my standard 5.8 module was not reliable, neither was the upgraded FSV2445 antenna diversity module...
It was some "sweat"work on the goggles and I dont have nice covers/doors yet - but the functionality is just awesome. I can fly WITHOUT my FR632 tower now and have good video downlink! Makes quick FPV sessions much easier!
Check out Bardwells videos on the different modules to see if the Furious TruD or the LaForge is better for you. The conclusion I found: LaForge seems to be the best (from features and usability) but the RF performance is pretty similar on all of those.
Pricerange is from 50 - 120$
See my new, ACCURATE, latency measurements here (thanks Daemon42). Now we're down to +-5ms accuracy! Those cams are pretty impressive. Runcam Eagle had good reviews already, Swift2 and HS1190 are good as well. I also compared the Owl+ and the AMOWay. Image looks good on most cams if DWDR options is turned on.
I've waited 2 month now for a new firmware which should have better scaling. Last FW from 27.12.2016 did not help here.
Instead they now gonna release the Legend3 (March) and make me look like a fool releasing the review for the Legend2 so late :)
I think the hardware wasnt fast enough to downscale properly. Legend1 didnt have to downscale (since it is native 1080p).
►Legend 2:
- like the low weight (45gr), the handling, build quality,
- rubber shell for protection
- cables, RC channel switch
- lost cam alert!
- wifi app is ok, but neccessary to change settings - small display preferable!
- really sharp in highest quality (2.5k), but terrible downscaler
Sensor: 12 megapixel Sony Exmor R BSI CMOS back-illuminated
CHIP: ? didnt find specs to the chip - and this maybe the cheap compromise here (which cant scale well)
Lens: FOV155°, F2.8, 7G optical glass lens
Length x Width x Height 67mm x 39mm x 17mm
Weight:45g
Battery: 700 Mah, 3.7 volts, 2.59Wh Watt
Firmware RCGroups
----------------------------------------------------------
►Runcam 2: yes I know - it's not focussed properly. My bad!
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►DJI Osmo Mobile:
OK, I saw it (too late) half my gimbal shots with S7 in 4k were out of focus. Happens to me sometimes with the phone. Needs extra care!
if you buy the R0de VideoMicro (50€, very good!) you get the TRS cable (which is NOT compatible with PHONEs - but rather with the original Osmo cam).
I found this adapter cable from "TRS" to "TRRS":
1x Rode SC7, Adapterkabel von 3,5mm TRS Klinke auf 3,5mm TRRS Klinke, Anwendungsbeispiel: Rode VideoMic Go, VideoMicro (oder ähnliches Mikrofon mit TRS Ausgang) zu iPhone oder iPad
got it from here: http://bit.ly/2lIIuTr
Buildlog:
hotglue the servos
glued vtail foam into plastic parts and carbon rod with hotglue
screw on the V-tail fins (secure servoconnectors with tape inside the tail-boom!)
mounted the 3536 1800kv turnigy motor (was easy fit there)
add grease into gearbox (crane grease)
used 60amp Turnigy plush ESC - plenty of space - ESC cables routed outside through air flow
add linkage to servoarms
currently use 5channels directly on radio, later add autopilot
first tries with fixed styrofoam nose - later installing FPV cam on 2axis gimbal (to look around)
(roll axis? to stabilized image - but this is useless with servos - one would need a brusless gimbal - so roll servo is useless IMHO)
CG: to achieve proper CG (around 75mm from LE) I had to move the battery (5200mah 4cell 433gr) all the way forward, did even carve out some more foam from the nose itself - so battery sticks a few cm in the nose). Also added some dead weight directly in the nose ~ 100gr) and the Runcam2 ontop the nose.
Brand:X-uav
Item: ONE EPO FPV Aircraft Kit
Material:EPO
Propeller:12x6 inch Folding Propeller
Wingspan: 1800mm (71inch)
Length: 1078mm (42.5 inch)
Wing area: 38.2dm2(592sq.in)
Empty weight: 750g
CoG: in middle of wing, 65-80mm from leading edge CG: about 76mm from LE
Flying Weight: 1360g(23lb) Standard, max:2kg
Wingload: 35.6g/dm2 (11.7oz/sq.ft)
Take-off Weight:2000~2500g
Features:
- Deluxe Editon with glassfiber inner board and 3K Carbon Tube.
- With two-axis servo gimbal that suits mini HD camera, easy to control and stable.
- Propeller Design: Complete new-power structure,will be lower the attack and resistance.
Recommend Drive System: Motor: 3536 KV1800
ESC: 30A/40A
Servos: 6x 9g metal gear servos
Battery:4S 14.8V 4000-8000 mAh Lipo
Runcam sent me their top cam - let's see if you can fly in total darkness with it! I compare the Owl against the popular HS1177 with a nice dual monitor setup.
►RunCam Owl Plus Specs:
1/2″ image sensor
700TVL horizontal resolution;
150 degree FOV lens (2.4 mm)
5V to 22V (suitable for 2s – 5s LI-POs)
light senility, 0.0001 Lux/1.2F min. illumination
Digital Wide Dynamic Range (D-WDR)
Digital Noise Reduction (2DNR)
Automatic gain control (AGC)
Back light compensation (BLC)
OSD menu
26 mm x 26 mm x 30 mm, 15 g net weight.
►Thoughts:
The OSD is pretty straight forward, just activated the DWDR and played with colors and contrast a bit.
Not as good with shadowd vs. sunlight on the day, but awesome in the night. Although you shouldnt expect to fly a miniquad in acro mode without "some" light in the night.
If you use it on a GPS stabilized quad or plane you could really almost fly in pitch black nights.
If you wanna explore darker buildings you will be surprised how long you get coloured images until it finally switches to BW mode.
I will have to do a few flights, but I think you can definitly use it as a standard cam and also fly in daylight if you are not too picky. And it is definitly better than those cheaper CMOS cams (like the one that came with my Vortex250).
Hier erfährt ihr wie man 31gr beim Vortex sparen kann, wie mein neuer FPV Rucksack/Trolley aussieht, wann und warum man Motoren tauschen sollte und warum ich dennoch abgestürzt bin
See Vortex 250 saving 31gr weight, my new FPV backpack/Trolley, when to change motors, and find out why I crashed...
