Some more info un the build process!
My DIMU arrived, and I soldered the connectors to the AQ6. Frozen here and now steadily completing the airframe.
- DIMU besides AQ6
- DIMU seen from the side
- Bottom view. Check the socket for bend pins (might happen during transport)
- Sockets soldered to the AQ6. Proceed as described in the wiki! I've used a 0.4mm pencil type solder tip and 0.35mm solder wire. Also cleaned the pads with a flux pencil prior soldering.
- DIMU found it's new home
- AR9020 used as 'diversity sat receiver'
As mentioned earlier in the build log, I'm going to use a Spekrum AR9020 receiver. The AR9020 + 2 Spektrum satellite receivers will give me three-antenna-diversity. The receiver's SRXL-bus - which uses the same protocol as a standard sat receiver - connects to the AQ6. In addition, the TM1000 Spektrum Telemetry transmitter is mounted on the quad.
Since the AQ6's 3.3V LDO is not able to power this receiver/transmitter setup I've made a custom cable (short bench-test version shown on the pic; the CamCruiser needs a larger on) which takes power from one of the motor outputs and connects the SXRL-bus to the AQ6 (grey wire = signal).
ATTENTION:
If you want to use this receiver setup on your airframe too there's one thing you must be aware: radio quality of the SRXL-bus NEVER drops to ZERO! The AR9020 will output the failsafe settings stored during binding. So the AQ6 will never know that the signal is lost!
Because of that, I've bound the receiver with the following preset-failsafe settings:
Throttle centered
Flight mode switch centered
Home action switch in low position --> activate RTH
all other controls centered (depends on your setup!)
In case of a signal loss the AQ6 should return to home position (be shure to set one when you start flying!).
Verify this via QGC! All channels should go to their preset-failsafe position when switching your transmitter off!
I've mounted one sat receiver on the fron left side of the frame, and the other one on the bottom. The TM1000 is mounted to the bottom too, whereas the AR9020 is fixed in the rear compartment of the frame with it's antenna completely outside of the frame structure.
- Sat1 - left side of frame
- Sat2 and TM1000 were mounted on the underside of the frame. Antenna of TM1000 needs to be routed.
Connected to the TM1000 is the 'flight battery voltage sensor' - as simple cable connected to the PDB - and the data cable coming from the AR9020.
- The AR9020 is mounted in the aft compartment. The device besides the LiPo is a XBUS battery capacity sensor.
The battery capacity sensor is this one
http://www.rctronix.de/wp/?p=163 (German text only!) but I don't know if I will keep it once Spektrum telemetry on the autoquad is available. It's alarm is currently set to 5200mAh, leaving around 800mAh for emergency.
- Weighting here! Weight is without props, gimbal/gimbal controller/GoPro, DC/DC.
With the craft (nearly) completed I took the chance to weight here. Seems like I will not achieve my 2500g AUW
. She's at 2200g without props, gimbal + gimbal controller and DC/DC_CAN_LED-board, video transmitter. But, since I will have enough trust to cope with the extra weight this shouldn't be a problem.
Weight! Something to notice: When it come to weight+telemetry HOTT is much more efficient! You will need 4 components (RX, 2x sat, TM1000) for spektrum telemetry, but only a small receiver for HOTT.
- Spektrum RC components weight - with some of the cables missing (thus cross weight will be more!)