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Re: Powertap elasped time on download different than display [trevor42] [ In reply to ]
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Yup. I have a Joule and LYC on my aerobars and the LYC reads longer every time. I put another email in to Saris. This problem should be their number one issue to resolve.


For sure!

A bit more background on my problem (for the benefit of any Saris support people reading this as much as anything). I have been basically been struggling with this problem the whole past summer. I'm using the ANT+ upgraded PT 2.4 with the LYC and downloading to PA. THe LYC and PA are both upgraded to the most recent firmware/software. I have done numerous tests on the same test course (approximately 9km long) and find that the distance is approximately off (high) by about 3% every time - primarily comparing to my Garmin 310XT but I have also tested against mapmyride and my 2009 Honda Accord odometer. The distance they measure agrees, the distance measured by the LYC is high by 3%. The strange thing is that the speed measured by the LYC and the Garmin 310XT agree exactly, once I get to a steady state (the speed averaging on these units is different). This tells me my wheel circumference is very accurate and clearly not the problem.

The distance error also persists when I upload from the LYC to PA. I don't use WKO+, I upload my data to TrainingPeaks - there error persists there, as expected.

If the Joule fixes this problem, I'd consider replacing the LYC. However, I'd prefer that Saris come up with a software patch to resolve this issue.

I now just realized that the cpu Saris replaced for me about a year ago didn't have the ANT+ upgrade but the one I received when they shipped my wheel back to me did have the upgrade. I'm seeing a common denominator here. What's hard to tell is if there is another variable that factors into the problem. For example, is it a combination of having the ANT+ upgrade with the latest firmware? I'm pretty sure I was running the latest firmware on my previous cpu but not positive.

Anyone seeing this problem who doesn't have the ANT+ upgrade?

Most importantly, why is Saris continuing to ignore us?

Thanks, Chris
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Re: Powertap elasped time on download different than display [lakerfan] [ In reply to ]
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I now just realized that the cpu Saris replaced for me about a year ago didn't have the ANT+ upgrade but the one I received when they shipped my wheel back to me did have the upgrade. I'm seeing a common denominator here. What's hard to tell is if there is another variable that factors into the problem. For example, is it a combination of having the ANT+ upgrade with the latest firmware? I'm pretty sure I was running the latest firmware on my previous cpu but not positive.

Anyone seeing this problem who doesn't have the ANT+ upgrade?

Most importantly, why is Saris continuing to ignore us?

Thanks, Chris


Since it's a problem with the LYC and not the Joule, I'm guessing that the problem involves the LYC firmware upgrade that is required when you do the ANT+ upgrade. I'm positive my LYC firmware is up-to-date, as I updated it through PA but also I had the problem with the replacement LYC that Saris shipped to me.

I'm curious to which communication channel the Joule uses - is it the same one as the LYC or is it the ANT+? If it's the same as the LYC, then the problem has to be the LYC firmware - because they should in essence be receiving the same information from the HUB. If that's correct, then this is probably a couple of lines of code to fix.

I'm going to see if Saris can resolve this one over the winter - if not, I'm pretty much decided on buying the Garmin Edge 500 as my replacement head unit before the spring season. About half the price of the Joule, gives you GPS and is a nice, compact little unit. Let's see what happens.

Trevor
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Re: Powertap elasped time on download different than display [lakerfan] [ In reply to ]
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First off an apology- certainly did not mean to make anybody feel ignored or slighted by our silence on the forum and lack of info. for those who have called in.

But, we've heard you loud and clear and are actively pursuing this issue. As you all know from reviewing this thread the issue isn't easy to pin down but you've all contributed a valuable piece to puzzle. We think we have the root cause isolated to the LYC firmware but need to confirm via some testing. We will then make the necessary patches available via PowerAgent.

Sorry for the lack of detail here but we're still investigating and I don't want to jump to any conclusions and give anybody the wrong idea. More details soon.

Jesse Bartholomew

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Re: Powertap elasped time on download different than display [powertap] [ In reply to ]
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First off an apology- certainly did not mean to make anybody feel ignored or slighted by our silence on the forum and lack of info. for those who have called in.

But, we've heard you loud and clear and are actively pursuing this issue. As you all know from reviewing this thread the issue isn't easy to pin down but you've all contributed a valuable piece to puzzle. We think we have the root cause isolated to the LYC firmware but need to confirm via some testing. We will then make the necessary patches available via PowerAgent.

Sorry for the lack of detail here but we're still investigating and I don't want to jump to any conclusions and give anybody the wrong idea. More details soon.

Jesse,

Fwiw, consider the apology accepted. I can't thank you enough for the update. Very encouraging!! Just so you know, I'm always willing to put in countless hours to help you guys resolve these kind of issues. If you need data, I'll send you data. If you need a specific type of data and I don't have it, I'll find it.

Thanks again!!

Chris
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Re: Powertap elasped time on download different than display [powertap] [ In reply to ]
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i also have some files that are way off if you need them. But they are in wko+. lmk if you want them.

Brian Stover USAT LII
Accelerate3 Coaching
Insta

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Re: Powertap elasped time on download different than display [lakerfan] [ In reply to ]
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Ditto to Lakerfan's last reply. Jesse, if you need data and I have it I'll be happy to send your way. Looking forward to my LYC back to being one of my best and most reliable friends. :_)
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Re: Powertap elasped time on download different than display [powertap] [ In reply to ]
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Yeah!
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Re: Powertap elasped time on download different than display [sentania] [ In reply to ]
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Just realized I neglected to update this thread when we released the firmware addressing this issue.

Version 7.63 for wireless and 6.63 for wired should fix all these issues and is available via PowerAgent.

Jesse Bartholomew

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Re: Powertap elasped time on download different than display [powertap] [ In reply to ]
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I have an old wired powertap with firmware version 4.07. Is this time/distance problem an issue for me?

Frankly, as long as the power is accurate I don't really care much if the distance is off a little.
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Re: Powertap elasped time on download different than display [gregf83] [ In reply to ]
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It's more then that, it's the time, which will skew AP and NP.
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Re: Powertap elasped time on download different than display [sentania] [ In reply to ]
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So in my case the samples are 1.26S apart. Is the bug that the time period is something other than 1.26?
Perhaps my PT is too old for this problem. I rode with it and an SRM and don't recall the power samples being skewed in time.
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