Data gaps
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Hi Alex,
I've got the same problem. Before I bought the Karoo2 I worked with Sigma Rox12 and experienced also gaps in the power record. I thought it was the Rox12 and changed to Karoo2. Meanwhile I think this could also be a reason of Power2max, because I bought a second NGeco and this also shows gaps. Sometimes I think this could cause of EMI interrupts. I can locate a point nearby a fly-in path where gaps appear more often. Maybe Karoo is more sensitiv towards EMI.
I also have large gaps after a 5 minute break because the powermeter was obviously disconnected from the headunit.
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Hi Berg,
this morning i reset all my devices, and powermeters, and re installed all the latest firmwares.
following this, i went for a short ride, with 3 efforts at 3,4 and 5 wpk, running alongside my garmin 820. I ONLY had the NGeco powerbox connected, and it showed no recording gaps.
following this
I went for another 2h ride, with a the hammerhead heart rate monitor connected (dont even get me started on the heart rate monitor) and a couple stops. before stopping the first time after 15 minutes of conscious continuous pedaling, there were no data gaps.
Following my 30 minute cafe stop, the gaps re appeared.
On further inspection of my ride, looking at the individual recordings for each second of data, there will be the occasional "0" in the power slot. What else i noticed was that it would occasionally still read my cadence, and that only the power is missing for 1-3 recording seconds.
Cycling Canada abandoned the wireless SRM units on the velodrome due to EMI, though i feel i shouldnt be getting EMI on a rural farm road in western canada, with only my phone around.
while changing my power averaging to exclude 0's might solve this entirely, im not a fan of having consistently higher power numbers. coming from a SRAM quarq which was within 8w of the power2max at 350w for 5 minutes, these were similar enough i could swap over.
having a pm that reads high, or low, seems invaluable. Though, as long as youre getting consistent numbers, and you only have one power meter ( WHICH I AM NOT, and i have multiple power meters ) it shouldnt matter a whole lot.
a year ago, i didnt use my karoo at all because of this same issue, though it was SIGNIFICANTLY worse, its so much better now i almost didnt notice, but its still a 30w difference in average power on a 2h ride compared to the numbers from my garmin.
hope this helps, ill keep updating as i learn more through trial and error this week. (ive tried everything suggested by hammerhead in the past, again.)
alex
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Hi Alex,
I can confirm this. There are some snips of my yesterdays compensation unit on the cycletrainer where I was pedaling all the time constantly. On outside rides it's more difficult to identify periods of no pedaling. So I examined some indoor rides and there are also some gaps though they were not longer than one second.
Do you use ANT+ or Bluetooth?
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Hi Alex
I looked in the settings. It should be switchable. I would be surprised if this was a paid option. I also have the "low budget" device. But I discovered something else. On my device, the Bluetooth AND the ANT+ interface is enabled. I don't think that makes sense. I only discovered this setting after actively searching for BLE now. You have to scroll down. Shame on me :-)
Tomorrow I will try to ride an indoor interval with BLE off, afterwards I'll try to switch to BLE
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Hi Alex,
- do not connect the powermeter to the headunit
- connect your powermeter with the Power2max smartphone app. (heard about problems when additional devices are connected to the smartphone, so switch them off)
- Battery status, device information, change settings popped up
- type on change settings
there you are
This works fine to me with android. I don't know about Apple
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How I tested:
- switched off ANT+ on Karoo2 and just switch on BLE
- switched Powermeter BLE-mode on, ANT+ off
- paired heartrate, cadence and powermeter sensors
- Batterie drop without GPS 5% per hour
Another thing what I tested, and this made me courius: I was able to pair both head units with the powermeter. Both showed the same value. Karoo2 was connected via BLE and the ROX12 by ANT+. I didn't expect this working.Therefore I assume that P2M is sending on both channels. I have a suspicion that this is why the battery life of my powermeter was only 200h instead of 300h, like otherwise stated. But that's just by the way.
I will have more tries to make this shure, also the ANT+ mode.
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Hi Alex
Ive noticed occasionally the numbers on the headunit post ride are accurate but once the file has been downloaded the data averages all drop and gaps appear.Does this mean you have discrepancies between headunit and dashboard in the summaries? How do you check the files before downloading?
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On the headunit itself when youre preparing to SAVE a ride you can see your averages through additional screens. They usually line up with the dashboard (you can check on the dash by clicking the ride) sometimes not, and they almost never line up with my golden cheetah or strava copies , those two read lower.
I just got back from a ride, let me work on the files.
Alex
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Berg,
Something very interesting is happening on my end.
i did a 90 minute ride today with both my hammerhead and garmin 820, with the garmin in my pocket for most of the ride (i've done this in the past with no connectivity issues using my quarq) and my finding are VERY curious...
The karoo fit file, dashboard, and head unit all show the same power numbers (focusing on power more than cadence here) 160w average, 181w normalized. avg hr 147 There are power cut outs that mimic the current issue, which I expected.
What I did not expect was the file on my garmin head unit reading differently from the dowloaded fit file! The head unit shows the true numbers which i feel are accurate based on 100,000km+ of riding at this pace. avg power 180w, normalized power 192w. the fit file on the other hand is showing TONS of gaps, and an average power of 150w, with a normalized power of 173w.
i have reached out to power 2 max as well. they told me, without ANY other advice in the email, word for word,
"change the battery"
im going to the store to get a fresh set of batteries. i put brand new out of seal batteries in when i re installed the PM, but the batteries had been sitting for some time.
ill report my findings again
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On the headunit itself when youre preparing to SAVE a ride you can see your averages through additional screens. They usually line up with the dashboard (you can check on the dash by clicking the ride) sometimes not, and they almost never line up with my golden cheetah or strava copies , those two read lower.
ah, I thought you meant the raw data. Anyway...golden cheetah shows averages without zeros, but I think it's also possible to display average power with zeros. Dashboard shows with zeros. Although GC is for informational purposes to me, it's a nice tool, especially to look at that raw data. I let calculate my data at 2peak and they show me both numbers with and without zeros which match to both platforms. If I ride long junk miles without any structure the difference is always about 20 to 30W. In structured indoor units the difference isn't that much just one Watt but the gaps are more meaningful because I know there are no pedaling breaks.
I'm not convinced that it's the batterie as long as you already checked the status of it. We will see...
Some weeks ago I put my Karoo also in the bag because of hard rain. The recording was unusable, a lot of really long breaks.
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heres what i mean. the garmin has WAY more gaps, probably due to it being in my pocket. the garmin file shows my averages as true, though i cant see the power curve. i can include the fit files but theres no real use.
ill test again tomorrow. troubleshooting drive train issues beyond this as well.
the ride without gaps, was this with bluetooth? or with ant + ? what did you change ??
garmin
hammerhead
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It was the same setup with cadence heartrate and power paired with BLE. I will test this Setup some more times. One Question: Do you have the FSA OEM powermeter? Didn't know that they sell the powermeter as OEM. I was wondering why they will charge for BLE, as it was standard in my crank.
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berg,
BTE has solved all connectivity issues. with only bte enables consumption per/h (at 100% brightness on the map screen with 2 data fields) uses 10-12%perh rather than 8-10%, running both bte and ant+ is also 10-12% per/h. very comparable, i dont ride more than 10h at a time usually, and when i go packing i take a power bank regardless.
thanks for troubleshooting this with me. the hammerhead team is working on improving connectivity to the p2m ant+ protocol
alex
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Hi Alex,
I am glad to hear that!
thanks for troubleshooting this with me.
...one beer for Berg... ;-)
It gave me a lot of insights as well.
It's also good to know that Hammerhead is working on that issue. Though it has not that big impact to me, I would prefer ANT+ anyway, because of the lower consumption. When this has been solved.
You measured battery drain without navigation? 10% with 100% brightness is far away from mine
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