Donnerstag, 16. April 2015

Aaronia Spectran HF6065 Review - very powerful handheld spectrum analyzer!

If you want to get a better understanding of how the video downlink or radio uplink to your FPV model works - you need such an measurment device. It's nice to read a lot about the theories but I need some proof. Here you can see what's going on.


Freitag, 27. Februar 2015

Thunder Tiger Ghost+

Aus Ghost+
Size: 450mm (motor2motor)
Weight: 2.25kg
Motors: 28x14mm  450kv
ESC: 30A - 6S
Props: 11x5

Flighttime (in hover with gimbal and cam):
~15mins (used 1462mah for 4:39 flight and calculated the estimate flighttime for save 80% battery usage)

1100€ (RTF with Copter+Charger+Gimbal+Radio+Battery)
+ 250€ for FPV Set (TFT+RX and TX)

Battery-Bay (Plastic housing):
3,5cm height
8,4cm width
housing is around 16cm deep (but you need to get cables in there...)
orig. battery without housing:
13,5cm x 7,2cm x 3,2cm     6S  6000mah   8c dicharge (48amps)  1c charge

Morpheus Gimbal:  for GP3 and GP3+  (not GP4?)
Weight: 280g,    2s-4s voltage
Tilt: 90°    Roll: 45°   Pan: 360°

Flight controller Gains:
without gimbal: (set per default)
Roll: 55
Pitch: 55
Sway:  95 (Yaw)

WITH gimbal (a bit heavier)
Roll: 45
Pitch: 45
Sway : 80 (Yaw)

FPV Set:
7" TFT monitor with sunshade and good brightness!
Internal battery, chargeable via USB plug.
8ch: 5733  5752  5771  5790  5809  5828  5847  5866

Official Thunder Tiger Infos
German instructions and tons of infos
German FPV SET description

PART 1: unboxing and review
PART 2: build video and indepth review
PART 3 Follow me mode tests
PART 4: FPV Tests and gimbal performance (tbd)

Freitag, 13. Februar 2015

Parrot Bebop

check out above album for some pics!

I was patiently waiting for this little tech stuffed drone to come out. I bought the AR.Drone 1 back than and loved the new concept. Skipped AR Drone 2 because I didn't see much difference (and had enough other quads) but this one was on my wishlist!
It's a wifi controlled flying cam rather than a drone. It looks like a camcorder with arms and props ;-)
Tech spces:
- weight: 393gr (without bumpers)
- flying time (11mins?  I estimate 8-10mins with std. 1200mah 3cell battery)
- fully stabilized 1080pcam (records fisheye 14mp and computes software stabilized video)
- tilt-able video (with two fingers on phone for example)
- video and control over 2.4 or 5ghz wifi
- can be controlled with only phone or dedicated skycontroller
- range varies (with wifi noise, used controller, channel,...) from only 100m to 2km (with skycontroller) under optimal conditions
- ios and android app (with lots of cool features)
Video quality:
At the time of this filming I didn't have a day with good sunlight (were the cam performs best) - so you see rather poor performance but a decent stabilisation (it was cold and gusty this day, didn't wanna leave my car). This session was fun - maybe I'll post the whole video from my first flights.
As soon as we have some nice weather I will show you that the cam here can work really nice.
- Center CAM-View:   double tap smartphone/tablett (non SkyController mode!) with BOTH fingers!
Now I need to see how you can center the cam in Skycontroller mode!
- Brightness/Contrast settings DO AFFECT the recorded video!

minor Problems I found:
Apps: make sure you always use the most current (my iPad app was 1 week old and had an issue with GPS status which I didn't have on my android).

You should be able to see your drone on a google maps style view but you have to preload this data. Because if I'm connected to drone I have no internet (even if I turn mobile data on my android stays just wifi and has no internet).

HDMI / Video:
I wanted to try my Fatshark Dominator HD, got a HDMI to MICRO HDMI cable and connected it to the skycontroller. Only got a few seconds of image on the goggles - flicker than black.
If I connect HDMI monitor to the skycontroller it works - so it must be on Fatshark side - or it's an incompatibility...
Hope I find I way for this.
But anyhow - the iPad view works really well. It's sharp image - but with some lag and occasionally stuttering video (control data is prioritized over video).
Bebop + Oculus Rift DK2? - not yet from what I read here
Wifi tuning to get optimal range
Official Bebop Blog
Facebook Group
Bebop News on
Good Review @
2 different sets:
Bebop alone (500€)
2 batteries
wall plug charger
4 spare props + propmount tool
bumpers (for indoor)

Bebop + Skycontroller (900€)
all of above +
1 more battery (used for skycontroller)
skycontroller ("real joysticks", strong wifi repeater, directional antenna, Smartphone/Tablet mounting)
sunshade (2 Parts)
7" Tablet adapter

Review Video:

Sonntag, 4. Januar 2015

ImmersionRC XuGong V2 pro

Propulsion Set from DJI called E300
ESCs: DJI 15amp
Motors: DJI 920kv (Phantom2 style)
Props: std. "Phantom2 Props"

Weight: 1085gr
(all except flightbattery which was 343gr)
so roughly 1,4kg min flightweight with small battery

Packingsize: (30x25x13cm)

Naza Settings:
light battery - 90-100% Gains
heavy battery: go down with gains a bit (best to assign roll and pitch gains to X2 so you can set it while flying).

Power consumption:
ezOSD showed 13,7amps in Hover - really nice!
Modified ezOSD here shows mah/min consumption as well (gave me 230-250mah/min).

Pricetag (as of 5.1.15):
200€ for Frame (incl. ezOSD)
200€ for Brushless gimbal (with controller)
109€ DJI e300 pack
129€ DJI Naza Lite (or better)
~70€ VideoTX
  70€ 4ch lite RX
+ Gopro, Fatshark, Antennas...

more Pics in my XuGong V2 pro Picasa album:

more Infos:
Official Page at (Manual, Firmware,...)
->> excellent infos from Deweytube here on RCG

XuGong Pro v2 - How to Update Gimbal Firmware (FY-G3)

Resonances? Try to get proper CoG and tighten the Joints on the arms!
(CG pic thanks to Deweytube!)

Samstag, 29. November 2014


Aus Trip
This thing comes from and the complete bundle is 199€. They even sell their own motors (german quality instead of cheap chinese ones). It's a small shop and Nic (the owner) reinvests the income of this hobby project back into the shop.

For the flightcontrol they recommended "Flyduino NanoWii" which is based on MultiWii.
Roll:   P=3.8   I=0.03   D=23     RATE: 0.35
Pitch: P=3.8   I=0.03   D=23     RATE: 0.35
Yaw:   P=5.0   I=0.045 D=0
Alt:     P=6.4   I=0.025  D=24
Level: P=9.0  I=0.01    D=100
Rate: 1.0   Expo: 0  (but 35% Expo on transmitter)

Total weight: 440gr with 1600mah and Mobius
Packing size: 20x20x8cm! (if props and antennas are unmounted).

Motors and ESCs are from their set (2300kv, 1806) running on 3S.

Batteries:  I use the same as on the DRQ250 (SLS 1600 and 1800mah 3cell)  and get a bit more flighttime out of them. 7-9min maybe - gotta test more.

Props: I tried the "Maytech Carbon" 5x3 they also sell and they are awesome. I'm normally not into balancing props (too lazy) but here it really made a difference! (Prop on a screwdriver, sand off some material from the prop half that moves down). Was maybe 15mins of work.

As you see in the vid the roll and loop rate is insane. Power is plenty - hover at 1/3. I'm not used to have so much "way" on my throttle stick left until full throttle ;-)

The downsides? Well maybe just the size - it's not easy to find space to fit additional stuff on it. The mobius is a tight fit between the front props - but no props in view! My video transmitter mounting is not optimal now. If I fly back to me the battery and copter block the antenna - signal gets a bit bad.

Freitag, 24. Oktober 2014

ImmersionRC Duo5800 vs Black Pearl Video Diversity receiver comparison

In this comparison video I wanted to find out if the Black Pearl (all in one - Display with diversityRX) is compareable to the dedicated ImmersionRC Duo5800 receiver. On paper they both have 90dbi sensitivity. See in the second part how they look in comparison. For my test setup I seperated video TX and RX with a few thick walls at home.
Also I measured all my antennas with the ImmersionRC RF Powermeter. You see the values at 2:24.
The normal ones were affected by alignment (horz vs vert) and the SPW ones were "immune" to different alignment - as expected. The directional antennas had great antenna-gain in the cone and somewhat less optimal outside of it.
Btw. you can also measure the mW of your video TX. You plug a 30dB attenuator in between and set it in the powermeter. Great to measure the advertised milliwats vs the real output!
Sorry for this not being super scientific but it gives you an idea of the image quality.
EQUIPMENT as seen in the video: Antennas
5.8 SPW Antenna    5.8 Helical Antenna
...more in my "Hangar"
►in case you wanna buy RCSchim a beer Thanks!!! ;-)

Samstag, 4. Oktober 2014

DIY FPV Goggles - cheap alternative with superb quality picture!

Here are the Buildpics:
DIY Goggles (Facebox)

Here I had my first look through it - and it was an amazing picture!

+ big
+ sharp
+/- comfy to wear - only the weight can be a problem if you pack too much on the goggles...
- some soldering needed? some cutting and fiddeling around

Maybe I can fit an adapter to use the NexWave 5.8Ghz module directly on these goggles?

-> Additional info (in german!) here at FPVCommunity from Prometreus
(with many pics!)

PARTLIST:  (complete costs ~ 70€ / 100$)
It ueses the frame from
around 20$? - fast shipping from UK to EU!
You can order deluxe version (with strap and extra lens). While I didn't use the lense here the strap itself is good enough. Just added a broader band at the back (see build images).

and a 5" TFT display from Dealextreme
(available in EU warehouse ~ 40$)
If you find them somewhere else - dont buy at DX - they're slow! EU warehouse is a joke. They deliver from China through Netherlands. So no customs but 3-4weeks delivery!

and finally better fresnel lens (optional) (tried both - this upgrade really gives you better quality!)

►►Update: just before publishing this vid I did a 2nd testflight with the MiniQuad. The picture is really big, great to fly BUT: the blackscreen issue can be tricky/scary. So not sure yet if I'd trust this goggles for an expensive, bigger, unstabilized platform. So if you have some other safety features (second monitor for emergencies) it's ok.
Hover recommended routing it throug a DVR - this might eliminate the black/bluescreen. Or optimal: search for a similar size display without bluescreen.

All links here provided are tips from Prometreus - thanks!
Check out his channel and subscribe him in return!

Donnerstag, 11. September 2014

Fatshark Dominator HD

First tests were a bit dissapointing. I compared them against RCV922 and AttitudeSD.
RCV922 has 46° fov and funny: it's sharp without diopter for me (I'm short sighted). AttiSD require diopters for me. Initially I didn't use diopter glasses and thought the DomHD are no way as sharp as the 5 year old rcv922 ;-)
After putting on the diopter lenses now (the ones from AttiSD fit) - the picture is really good! Most notably you get blown away by the color quality. Also you get less barrel distortion. These optics sure were hard to design!

FOV - screensize

For me it was always the most important factor to really get immersed with FPV - big screen! The RCV922 were great regarding this - but you couldnt read OSD info in the edges...
AttiSD were better for OSD - but not so good immersive feeling. DomHD now delivers both - quite sharp on the edges and huge screen. On the last FPV meet I tried many different models (AIO, Skyzone, Cinemizer). Most of them have around 30° fov - way to little for my taste!

Wearing comfort:

I always preferred the foam from rcv922 over the rubber eyecaps. So old ones are nicer to wear for me. With AttiSD and now DomHD I get ugly eyerings with fpv sessions ;-)

IPD adjustment:

Is fine for me - almost sharp in all corners - much better than with RCV922 for sure.

Image comparison:

This is hard - and I here only had limited time. Used just a galaxy S4 cam pressed against eyecaps (approx same distance on all 3 goggles).


Super option! I tend to fly just with 5.8 nexawave RX without groundstation. Just makes no sense flying miniquads with huge groundstation. Keep it portable here!So DVR is a good safety option if you crash. One wish: please make the DVR autorecord after powerup. May be energy waste and SD card wast - but also use cycle recording!
And: if you crash and panic and tear away your goggles you may be dumb enough to just unplug power and not stop DVR rec first. In that case the DVR recording is lost. So we have to get used to always stop REC after crashing ;-) Other than that: rec quality is really good, 720x480 30fps with 8mbit


The first batch is said to be delivered with a free (instead of optional) Trinity HT Module already installed. I didn't test it yet but the new module should be really accurate and makes me wanna revive an big plane and install Pan/Tilt on it (which I hopefully will find the time for).


First I was a bit dissapointed - but now I don't wanna use the other goggles ;-)
Diopters were needed - that was one dissapointment - and I couldnt believe the high price (650€ in germany!) - but now I learned here from Fatshark that the LCDs are making it so expensive.

too lazy to read? Here's my Video Review:

Donnerstag, 5. Juni 2014

DJI Phantom 2

My Mods:
1,2kg FPV ready with Gopro and Battery!
15min with Zenmuse Gimbal and Gopro3
Power consumption: 270mah/min

Phantom Assistant Software:
Install all available firmware updates...
Switch to NazaM mode instead of Phantom mode to enable some additional features!
      Pitch Roll Yaw Vert
Basic: 120 120 100 200
 Atti: 200 200

Flyaway problems:
My conclusion - the std. radio and the internal receiver are crap. They can be tricked by interfering signals (wifi,...) quite easily! I don't know any other 2.4 radio that is so sensitive...
read here...

GPS Antenna is fragile!  /  GPS reception issues!?!
If a newbie crashes his phantom (maybe because of a flyaway) the top mounted ceramic GPS antenna might get cracks and the reception of GPS satellites can be weak or even worse can be sporadic (sats dissapear while flying - flightcontroll is confused - tries to countersteer the sudden loss of position and goes crazy?)
I have a P2 here that had a crash and now the sat fix sometimes takes forever, sometimes it's here in a few seconds. I learned that if I fly in Atti Mode first, then after landing I could get GPS fix really fast.
Ultimately: I had serious problems getting GPS fix - even with new antenna! Only after removing the (somehow torn apart) protection foil copper thing it worked for me. Maybe the foil was giving a short circuit to the GPS antenna circuitboard? No Problems since than...

Interesting Links:
German - Startvorkehrungen - was tun bei einem neuen Phantom 2
Flyaway discussions - good explanation

Broken GPS Antenna as cause for no GPS Fix (always 3 red blinks...)
Replacement GPS Antenna: found at Digikey Part: GP.1575.25.2.A.02 ANTENNA GPS PATCH 1575MHZ

more Pics:
Phantom 2

Montag, 14. April 2014

DRQ250 - MiniD Racing Quad

All up weight 580gr (with cam, fpv and 1600mah 3cell battery)
Flighttime: 7mins
Power Consumption: avg. 215mah/min    avg. 13amps  (but most of the times flown speedy!)

Cams: Mobius Wideangle and seperate FPV cam
ImmersionRC 5.8 VTX with SPW antenna fed directly from 3cell 1600mah SLS Battery

Radio: FrSky Taranis <-> 2.4ghz X8R Receiver

KK2.0  Version 1.2 (update pending - but I fly manual here it shouldnt change much...)
Roll    Pg 65/ lim 100       Ig 37/ lim 20
Pitch  same (linked)
Yaw   Pg 60 lim 25          Ig 40 lim 10
Stick scaling all at 60

get the Frame @

Motors (they have cw and ccw nuts - so get 2 of each kind):
2 x RCX 1804 (2400KV) Brushless Motor (Anti-Clockwise) (ZMR-XPOWER-10)
2 x RCX 1804 (2400KV *R) Brushless Motor (Clockwise) (ZMR-XPOWER-16)
Hobbyking Multistar Motors? (just saw them - might be a good option)

4 x RCX 15A ESC Brushless Motor Speed Controller (SS Series / Multicopter - SimonK Firmware) (RCX07-187)
Update: Motors are not so good, Vibrations and not equal performance - so buy more to select the best maching to get good results. Or get the recommended SunnySky ones...

Props (get some spares - you'll need them!)
2 x 5x3" (3-Rotor) EPP5030 Counter Rotating Propellers (CCW / Black / 3pcs) (RCX01-124)
2 x 5x3" (3-Rotor) EPP5030 Counter Rotating Propellers (CCW / Green / 3pcs) (RCX01-127)
2 x 5x3" (3-Rotor) EPP5030 (*R) Counter Rotating Propellers (CW / Green / 3pcs) (RCX01-126)
2 x 5x3" (3-Rotor) EPP5030 (*R) Counter Rotating Propellers (CW / Black / 3pcs) (RCX01-125)
if you can fly - change to the more expensive carbon props:
4 x 5x3" EPP5030 Counter Rotating Propellers (Pair / Carbon Fiber) (RCX01-130)

Resources and Links:
buy it here:
or here:
BUILDLOG from Sine @Openpilot

DRQ250 Buildlog/Pics:

Onboard CAM - Update:  I now use a second FPV cam for Downlink. Everyone does it this way - I did some tests and now I'm also convinced ;-) - see this LAG / FOV demo vid:

Donnerstag, 3. Oktober 2013

Black Snapper (Globe Flight / RC Upgrade)

Tech Specs
Black Snapper, CFK Aluplatte, Landekufen, GPS Halter klappbar, RC Einbaukit
DJI Naza V2 + DJI Iosd mini
Tmotor MT4006 -13 (92gr, 740KV, Max 24A, 250W)
ESC Maytech 30 Amp
Graupner Prop 12x6 + Distanzhüllen
GF Brushless Gimbal + Alexmos Board (FW 2.2b2)

Weight (Full FPV, Gimbal, Gopro3 but without battery): 1,8kg
Folded Size: Width: 25cm    Length: 44cm     approx 13cm height (if GPS is folded down)

Naza Gains
pitch roll yaw vert
Basic 150 150 120 130 
Atti 150 150
Important: make sure your CoG (Center of Gravity) is correct. This means you have to move batteries really far backwards! If you have an hard to control copter (especially if you "yaw" fast) your CoG maybe wrong. Look this vid to see what I mean! With 2 strings I determined the CoG: PIC
I also had problems with non straight motor alignment: PIC

Flighttime: ~14-15min  with 6600mah 4cell
I use 2x Turnigy Nanotech 35C 4S 3300mah  paralell (6600mah)
Powerconsumption:  ca. 370mah / min   the flying weight is 2,4kg!     avg. 19-21Amp

Motors: great - till now I just knew normal little motors that spin 9x5 props and high rpm...
This works but it isn't efficient. You only get around 10min flighttime max...
These motors here have long cables so that the cabling can run in the carbon tubes. This gives nice installation and less air drag under the props. This reduces vibrations!

GimbalI opted to use the Black Snapper Gimbal which comes as an option here. It is controlled by the Alex Mos board which has a good reputation. Build quality is great, Gopro3 fits in well. Motors are good and what they do looks and works like magic! You get really good cam footage - no matter how the copter rocks in the wind - the gopro is straight! I ordered my alexmos board here: buy Alexmos @Austrian Shop who sells a ready soldered board!

best Alexmos Pid Settings
(Juz70 Settings, same Gimbal Motors, different Quad)
       P   I    D   Power at 12V (fed over Balancer-plug)
Roll.  9  0,12  9   88
Pitch. 5  0,14  5   78
Roll invert, 14 Poles,     Sensordirection: Y, right: X
RC settings, PWM       Pitch: RC_Pitch
Min Angle Max Angle
Pitch -35           75           Speed Mode (LPF 4)      Speed 6

Video Guide to Alexmos - good explanation cleared things up for me!
Approx double the P value of Roll vs Pitch!
I gain defines the "speed" to compensate movements...

iOSD Mini: (
Since I use the Gopro Liveout and my view is always straight I cant judge the position of the copter well in the air. You can tell if you "lean" forward or not... So the iOSD is great because it overlays an "artificial" horizont (a dotted line) that shows the copters angle. It also displays pitch and roll as numbers on top.
Great idea: the iOSD has access to all the sensor and GPS data directly from Naza - and doesnt have it's own sensors! This way you get very accurate data. You even see the num of sat's Naza hast, the Flying mode it's in and of course other OSD data like Speed, distance and height...
Most astounding: the home orientation help is really helpful here - rather than a little 3d arrow you get a fluid square floating over your home position (if you're looking in the right direction, otherwise you get a left or right arrow on the border - just see my video and you'll understand...)

Links and Info:
FPV Community Build log (german)
Official Manual from Globe Flight (German, not finished)
Buy this and all other FPV Stuff here!


Montag, 22. Juli 2013

RD450 - KK2.0 based Quadcopter

This Quad has a nice story:
after seeing a spectacular video on which I commented I chatted a little with Trinco and he offerd to send me a pre series model of the frame he built.
Update 6/2014: I feel bad about me leaving this Quad on the workbench unfinished so long. Even better does it feel now - once it flies great and powerful. My most "grown up" Quad till now. Not hightech (simple KK2, no GPS, no OSD, no gimbal) but very potent motors and the needed power for great highspeed dive videos (I really enjoyed them last year!):

It looks quite similar to the QAV400 and it has a very high material quality!
The arms are aluminium, Plates are G10.
There is a dirty section (bottom with motors, ESC and vibrations) and a clean section - both separated with rubber bobbins. It may look scary to only place your whole quad on only four screws but this way it isolates the vibrations most effectively!

==>> Buildlog

Tech Specs:
Frame: RD450 from Trinco (nice and easy to screw togethter!)
Motors: Robbe Roxxy Bl Outrunner 2834/08
Props: Graupner eProp 9x5
ESCs: RCTimer ESC 30amp SimonK flashed
Cam: TBS 69 / Gopro3BE
VTX: AvionicsRC 2.4GHz (powered directly from Balance plug of flight battery)
Weight: 1,4kg (all stuff like gopro, gelpad, but without battery) so I have a flying weight of around 2kg!

Flighttimes / energy consumption:
flying weight around 1,8kg
power consumption: 550mah / min    ~ 33amp    (on an average flight, not only hover!)
 Update: now I use SLS 5000mah 4cells and get safe 7:30mins - not much - but this air-time is awesome!

Vertical performance (measured with GPS Logger with barometric sensor):
max 50km/h VERTICAL speed!!  this really feels like a rocket seat!
Horiz.Speed is around 80-90km/h over 100km/h on fast dives...

Roll/Nick:  P Gains: 60/ Lim 100     I Gain: 30/ Lim 20
Yaw:          P 70/50    I 40/20
Stick scaling: R 50,  P 40,  Y 50,  Th.70
Min Throttle: 15 (with 10 one motor didnt spin up at the same time than the others)

I really encourage you to follow the RCGroups guide to find the right settings! RCGropus KK Settings thread

-> get the Frame here


Donnerstag, 14. März 2013

F450 KK2.0 PowerQuad

3/2013: my current little Power-Quad

This is my attempt to test out 5,8Ghz Video and KK2.0 controller for a cheap multicopter.
KK2.0 board is really nice to setup.
For the "tuning" of the important PI settings your should follow the easy tips in this guide here on RCGropus

Tech Specs:
Frame: DJI Flamewheel F450   (nice and easy to screw togethter!)
Motors: NTM2826-1200/17345 NTM Prop Drive Series 28-26A 1200kv 250Watts!
Props: Graupner eProp 9x5
ESCs: Turnigy Plush 18A
Radio: Scherrer UHF Longrange (red V antenna)
Cam: Gopro2 with liveout (100ms delay - see this video)
VTX: Fatshark compatible 5,8GHz from (powered directly from Balance plug of flight battery)
Weight: 1015gr (all stuff like gopro and gelpad, but without battery)

my KK-Settings 14.4.2013
Roll/Nick P Gain 55 / Limit 100 I Gain 30 / Limit 20
Yaw P gain 50 / Limit 20 I gain 50 / Limit 10
height dampening 0 (Limit 30)
But I really encourage you to follow the RCGroups guide to find the right settings! RCGropus KK Settings thread

Pricetag: around 230€ maybe...
F450 DJI Flamewheel Frame: 50€
KK2 Controlboard @ Hobbyking 30$
4x 18amp Turnigy Plush ESCs 12$ each
4x motors 15$ each
2x Graupner eProps 9x5 5,4€ each
and 2x left spinning Graupners 5,4€ each

Mittwoch, 7. November 2012

FPV Wissen / Knowledge

Hier entsteht ein Sammelbeitrag mit Links zu guten FPV Infos / this will grow to a thread of usefull FPV hints and setup tipps.

9/2014: Update: new preview Article "DIY FPV Goggles" - (not the cheap HK ones)

Playlist with Tech-Related videos:

Videofunk / Antennen
Cloverleaf / Skew Planar Wheel Antennas
Videotipp: xJet (Newzeeland) has a great video explaining FPV Antennas!
and now Bruce (XJet/RCModellReviews) also did a great 5.8ghz Video:

FPV Antenna 101
Sircana on plans a "Developing the Ultimate FPV Video Link"

Steuerung / Longrange
new 2014 ► Taranis infos:
Soundfiles / mod:

►Taranis ImmersionRC ezUHF Module:
- Output Power high 500mW , low 200mW
- DC Power Input 6v -- 13v
Manual download

Scherrer Longrange UHF System connected over 35Mhz wireless to Futaba FF10
FPV - Range of 35MHz radio
in deutsch: FPV - Reichweiten von 35MHz System

>> NEW: Gopro3 and Gelblock for best quality!!!
>> NEW: Gopro 1&2 Liveout Delay measurements - how much lag is ok?
GoPro anti vibration mount on tricopter
Aufnahme von analogem FPV Video - USB Grabber vs SD Recorder

Respect THE LAW - Rechtliches zu FPV in Österreich
Link zu - hier gibts Erklärungen zur Gesetzesnovelle LFG (gültig seit 1.1.2014)
Luftfahrtgesetzt 2014 - PDF

Sonstiges / Misc.
Controlling AR Drone with Windows Laptop and Joystick / Gamepad!!
RC-Wissen - was bedeutet C bei einem Lipo

FPV Ssammelthread mit vielen Infos und How-To Videos: - "HOW TO BE SUCCESSFUL IN FPV" - wenn das mal nicht gut klingt!

Samstag, 4. August 2012

TBS Discovery

Tech Specs:
Naza Flightcontrol with GPS addon (this is a must for FPV!)
Weight: 1,3kg (FPV ready; without battery and GoPro)
Motors: T-Motor MN3110 -15 780KV  (new, installed Mar/14)
Props: Graupner e-Prop 10x5
Battery: 4cell 3300-5000mah high C-Rating!
Battery bay measurements: 3-3,5cm high, max 5cm width, 14-15cm long
Power Consumption: avg. 319mah / minute  (using 3600mah 4cell  I get save 8 mins)

Current Naza Settings (28.2.14):
Basic Gains: P:100 R:100 Y:100 V:100  (since new motors and 10" Props had to move back to 100%)
   Atti Gains: P:100 R:100
Mounting GPS: -10cm,   Current Firmware: 4.02
Radio: FrSky X8R,   Expo and DR for Manual Mode 25% Expo, 70% rate

TBS Store - also links to buildlogs!
FPV-Lab Forums (Trappy writes here!)
Speedstep23s Disco Tipps video
Loosing height on left turn? SOLUTION
Sebastians (Globeflight) intro to the GPS mode
you can also buy DJI stuff at

Build Pics:

Things learned from my build:
Earplug Mod also works great on TBS Disco! Maybe some vibs but they don't get on the 720p60 mode of the gopro. 1080p30 works but has some jello.
GPS is very nice addon - gives you confidence while flying far out!
I already did a RTH test - and learned that TO DISABLE the autolanding you have to switch the mode switch to manual and back to GPS mode!!!!

Dampening of VideoTX is important. I used a foam piece - a simple 3m tape alone wasnt enough.
Unfortunately I burnt one VideoTX and the TBS Core on my build (switched red with black cable...) - so I had to leave this away for now - sorry Trappy!
Important: I had two motors "stuttering" and found a simple cause: I accidentally used 10mm screws to fasten the motors. This didn't "feel" wrong when spinning the motors by hand - but it caused this problem. As soon as I changed back to the original 8mm long screws - it was fine! I ran into the stuttering again by using Roxxy motors. I think the DJI ESCs are quite picky on what motor they support.
Looks like the Naza's barometer is sensitive to sunlight: it causes height drop if you turn into the sunlight. Prevent this by adding some black tape or foam on the left side of the box. See my video

Further tuning:
I ran through 4 types of motors:

First the stock DJI 920kv (150 Watt) Motors: they are not bad - only my sample had two with bad bearings - they turned harder - got hotter - I didn't like that.

Then my old Roxxy 2728/34 (110watt, 750kV): quite efficient with 10x4,5 Props - but this combo has vibrations (at least for me - maybe one can balance this properly and get good results). Power would have been OK. Another Issue: I had them "stutter" on my DJI ESCs - so they are maybe not compatible.

Last but not least RCTimer 2830/14 750kV (185 watt):
These are the selection from TeamWhiteLama - and sold from Trappy (TBS). They are just great, cheap and seem to run very smooth. (I had them for 200 flights and then switched as a precaution against failure to more expensive T-Motors (see above))

Tests on 4cell:
DJI Motors with 8x4,5 DJI Props: 17amps @ hover
Roxxy Motors with 10x4,5 Mikrokopter Props: 15amps @ hover (same battery)

Battery selection? I decided to use the Turnigy 4cell 3600mah 30c
(available in DE warehouse - ordered this tuesday afternoon, got them today!)
All batteries are in good shape and have around 400gr with connector. First one of them was used today. Work well and fit perfect in the bay! Power is more than sufficient for nice ascension! It's definitly worth to use 4Cells on the TBS! 3Cell isn't as stable...
Update: currently a SLS (Stefans Liposhop) 5000mah 4cell fits in perfectly and gives nice flighttime extra (10-12mins).

Sonntag, 18. März 2012

Cloverleaf / Skew Planar Wheel - Antennas

Update 6/2012:
I got new Antennas from (the guy who made the 100km range record possible!
They look very promising. I went with SPW Antennas (receiver and sender) plus an additional helical directional antenna (the weird looking spiral). It should have the same 60degree horiz/vert "cone" of reception as my previous used 8dbi patch - but this new one has 11dbi gain!


This is what my other SPW / Cloverleave antennas look like:
Left: TX Cloverleaf - 3 "leafs" / Right: RX Skew Planar Wheel - 4 leafs

In comparison to normal rubber antennas they are much better. Nearly no dropouts while flying 360° around!

The only problem I had here: the soldering "knot" got loose due to vibrations - so signal was bad. After i fixed the soldering I covered everything with a 1cm diameter epoxy drop. This should be safe now! (not visible on the pic)

Donnerstag, 5. Januar 2012

Techtipp Recording FPV Video USB Grabber vs DNT Action Recorder AR3.6


Wie nehme ich am einfachsten das Downlink-Video auf (also das analoge Videosignal, welches die Bodenstation erreicht). Warum nehm ich das überhaupt auf, wo doch die GoPro onboard in HD aufnimmt? Hauptsächlich als Vorsichtsmaßnahme - sollte ein Absturz passieren, ist es einfacher auf dem Video die letzten Sekunden zu analysieren, um zu wissen, wo das Modell zu finden ist, als sich im Gedächtnis zurückversetzen zu müssen.
Also: Sicherheit!

Ausserdem kann man auch mal ohne HD Cam fliegen wollen, und halt "nur" SD Qualität haben (Gewicht sparen, länger fliegen).

Bis jetzt hab ich meist mit dem USB Grabber auf dem Laptop aufgenommen (siehe Setup-Video) dies nimmt aber doch einige Zeit in Anspruch.

Nun hab ich jetzt dieses Ding hier gefunden:

DNT Action Recorder AR3.6

Es ist eigentlich als Helmkamera konzipiert, jedoch heute eigentlich nicht mehr aktuell (analoge Helmcam vs Gopro...) aber es hat interessanterweise einen AV Eingang, und auch ein Kabel um Chinchkabel anzuschließen, somit muß man sich nichtmal ein Kabel zurechtbasteln!
Die Technische Details laut Hersteller.

Mein Fazit: die Qualität ist zwar nicht ganz so gut wie bei der USB Grabber / Laptop Variante, aber dafür ist der Aufwand weit geringer. Wenn man das Video sowieso nur als Blackbox / Datenlogger verwendet, ist's sicher genug, für bestmögliche Qualität mit Analogvideo ist immer noch ein USB Grabber besser geeignet. Damit ihr den Unterschied der beiden Aufzeichnungsmethoden seht, hab ich das gleiche auf Laptop und AR3.6 aufgenommen und nebeneinander gelegt. Ausserdem werden hier auch gleich meine 3 verschiedenen FPV Cams vergleichen (420,480 und 520 TV Linien Auflösung).

USB Grabber Methode:
Digitus USB Grabber
Virtualdub zum Aufnehmen, XVid 8MBit Bitrate codec (hohe Bitrate, damit wenig Verlust)

Virtualdub posprocessing:
Filter deinterlace (ELA), Filter brightness/Contrast
gespeichert als uncompressed avi -> weitere Bearbeitung in Sony Vegas 10
(also hat man ein großes Tempfile zwischendurch und ein paar Schritte, aber auch gute Qualität)

Aufnahme mit DNT Action Recorder AR3.6
2,5MBit Bitrate
Einfach einen Knopf drücken, dann das File von SD Karte ins Videoschnittprogramm werfen.
Wobei: man sollte den "Bewegungserkennung" Modus verwenden, sonst wird die Aufnahme bei schlechtem Videolink abbrechen!!!!

Und so sieht das ganze nebeneinander aus:

(man sollte sich den Vergleich in 1080p und Vollbild ansehen!)

Sonntag, 25. Dezember 2011

MPX EasyStar2

Tec Specs (of my Stock RR Version):
Wingspan 1366 mm
Length 977 mm
Motor: original is: PERMAX BL-O 2830-1100
   (Upgrade: NTM2826-1200/17345NTM Prop Drive Series 28-26A 1200kv 250Watts!
Prop: orig. Folding 7x6"
   (Upgrade Prop: 8x6 trimmed down a bit (und cut some foam out of the fuselage as well...)
weight starting at: 700 g my act FPV Version: 995gr (with 270gr battery)
Flächeninhalt ca. 28 dm² (Flügel + Höhenleitwerk, ohne Rumpf)
Flächenbelastung ab 25 g/dm²

LINK: Testbericht

Maidenflight VIDEO here

Sonntag, 9. Oktober 2011

FPV Setup (Groundstation, Longrange Tower)

RCSchims FPV Groundstation:

This is my FPV videotower. It has an diversity controller (yellowjacket Pro 2,4GHz), two patchantennas (8 and 9 dbi circular polarized), an SD Card recorder and a 5000mah 3cell lipo powering this all.

Thomas Scherrer's LRS <-> 35MHz Futaba FF10

Diskussion über dieses Thema in deutsch (auf der FPV-Community
RCGroups Diskussion
Update: Scherrer himself "approved" my solution - so the next testflight should proove if it works under real conditions ;-)

I ran into serious cable issues with the connection of my Futaba FF10 via the trainerport to the Longrange system (Scherrer LRS). First I had the box directly fed from Futabas Battery and mounted on the back of the TX. This has two disadvantages:
- Futaba is RF sensitive and starts to beep if the rear sliders are in the middle position
- The LRS Box distorts the image on the Fatshark goggles if to near (within 1m)

So I mounted LRS box on a tripod, used an own 3cel battery for power and a long cable to the trainerport. This worked the last few month of FPV but it also has one problem: if used often the trainerport cable is worn qickly and this can lead to loss of control in the air (if you loose connection between LRS and Futaba).

Wireless LRS Uplink Twoer:
- Futaba FF10 with 35Mhz ch61 sending the signal of 35MHz to:
- ACT 4dsl receiver with PPM sumsignal option (often used on mikrokopters) this is connected to the LRS Box (PPM and ground)
This way I have no cable issues and no fear about a weak cable connector / soldering...
Just my Futaba and the LRS tower some distance away. To protect my LRS uplink from other RCers that might also use 35MHz and same channel I would use only a short cable on the ACT RX - so it "hears" only my signal. I heard of this idea but now I had a serious reason to try it out - and it worked on the first attempt! Great!

Here are 2 pics showing the LRS tower with my wireless option:

As you can see I tried to cover the important little 35mhz receiver with foam to protect it from the "daily fpv use". I hope nothing wears up here too fast. Also I had to use a seperate battery pack to power the 35mhzRX.