I’m having an issue with SiK-based radio telemetry on ArduCopter 4.0.4 and multiple GCS softwares.
In summary, as soon as the aircraft is armed, parts of the telemetry stream appear to freeze and no longer update for the duration of the flight (until the aircraft is powered off). Most of the time, it’s the HUD that freezes (attitude stays locked level, altitude, speed, vsi all read zero and don’t budge), but I’ve also seen battery information freeze with the HUD still moving, and in once instance a complete loss of telemetry.
Unfortunately, I’m somewhat restricted in my ability to post raw log files, but I’d be happy to provide screenshots and as much info as I can on request. This has been reproducible for me on multiple aircraft, multiple GCS laptops, Mission Planner and APM Planner 2, and every combination of those things.
Some things I’ve wondered about:
- Telemetry radio temperature limits. It’s quite cold in my location, and I do see the issue happening outside reliably. I’m using the Holybro v3 915MHz modules. However, it also happens indoors in a heated environment (50+ F)
- Outdated radio firmware. Used MP to update to latest SiK firmware, no change.
- Mission Planner issue. Eliminated in my mind - happens on APM Planner 2.0, on at least 3 different computers (with both software packages). MP version 1.3.74 build 1.3.7563.27684; APMPlanner version 2.0.26. Windows 10 on all machines.
- Hardware failure: happens on 2 different aircraft with 3 different Cubes (Black). One acft has had its cube for quite some time now with no issues, one got a replacement due to an unrelated issue; telem loss occurred on both old and new fresh-out-of-box Pixhawk. I’ve also tested multiple (at least 3) different telemetry radio units on the ground side.
I believe it may be related to the SR0_* parameters. I did mess with some of the stream rates in MP a while back, but didn’t notice this issue then - I’ve now put them all back to default, and still get nothing. Mission Planner’s tuning window also supports this hypothesis - I can see roll and pitch targets, but the actual roll and pitch lines freeze along with the HUD.
Has anybody else had this happen? If so, how (did) you fix it?