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Momentary Loss of Input
#1
When I punch my throttle for 1 second and then cut it and try to roll my quad becomes unresponsive for a spilt second. Specifically, immediately after I cut the throttle I am not able to roll, but if I try rolling again it works. Same issue for anything I try after punching the throttle.

Happens on fully charged lipo. No RSSI warnings on my Taranis. Using X4R-SB rx.

Any suggestions are much appreciated!
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#2
First thing that comes to my mind, have you enabled airmode?
[-] The following 1 user Likes oyvinla's post:
  • Drone0fPrey
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#3
Yep airmode is always on. The quad seemed to work fine in previously. The issue I am seeing is new.
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#4
Possibly voltage spike if it's happening only with throttle off. Do you have a capacitor installed on your PDB?
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#5
What flight controller? What firmware and version? What motors, ESCs and props? Can you record a black box log?
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#6
No capacitor. Maybe I will add one. Has there been reported issues with controller inputs not getting registered during voltage spikes?

FC is betafight F3. Betafight 3.1. Aikon esc and brotherhobby T2s.
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#7
I've not heard of any behaviour like that.

A black box log will tell you what is happening.
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#8
(01-May-2017, 09:10 PM)NoxNow Wrote: No capacitor. Maybe I will add one. Has there been reported issues with controller inputs not getting registered during voltage spikes?

FC is betafight F3. Betafight 3.1. Aikon esc and brotherhobby T2s.

Yup check black box and see if anything funny is happening with the RC Command?
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#9
could also be FC shutdown.. so check soldering, and any loose cable...
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
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#10
Looking at the bb logs, during regular flight (just flying straight), I momentarily lose control (less than a second).

From what I can tell from the logs: rxSignalReceived goes false then ~300ms later, rxFlightChannelsValid goes false. At that point throttle goes to zero. All motors goes to 0%. I suspect betaflight cuts throttle as a failsafe. ~600ms later rxSignalReceived, rxFlightChannelValid return to true and throttle, motor % return to same values before outage. Using X4R-SB, transmitter does not sound any loss of signal.

I've tried to jiggle the wires and connections while the quad is powered on to try and re-create the issue, but no luck.

At this moment I suspect it may be an issue with the RX or my Taranis. I will also re-check the solder joint between the X4R and betaflight F3 FC to confirm the joint is good. Any other ideas on what's happening will be greatly appreciated.

Thanks.
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#11
(29-May-2017, 04:56 PM)NoxNow Wrote: Looking at the bb logs, during regular flight (just flying straight), I momentarily lose control (less than a second).

Thanks.

Does anything happen on screen when that happens?
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#12
(29-May-2017, 04:56 PM)NoxNow Wrote: Looking at the bb logs, during regular flight (just flying straight), I momentarily lose control (less than a second).

From what I can tell from the logs: rxSignalReceived goes false then ~300ms later, rxFlightChannelsValid goes false. At that point throttle goes to zero. All motors goes to 0%. I suspect betaflight cuts throttle as a failsafe. ~600ms later rxSignalReceived, rxFlightChannelValid return to true and throttle, motor % return to same values before outage. Using X4R-SB, transmitter does not sound any loss of signal.

I've tried to jiggle the wires and connections while the quad is powered on to try and re-create the issue, but no luck.

At this moment I suspect it may be an issue with the RX or my Taranis.  I will also re-check the solder joint between the X4R and betaflight F3 FC to confirm the joint is good. Any other ideas on what's happening will be greatly appreciated.

Thanks.

That's a failsafe for sure.

How do you have the receiver's antennas mounted? Remember that carbon fibre is conductive and will block the signal from your radio, so you need to make sure that the antennas are in the air and not mounted against the frame.
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#13
Found the RX negative wire soldered to the FC was a bad solder joint. I've resoldered. Raining today so I will test on the weekend. Thanks everyone for your suggestions.
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