2.4 PT Dropouts

DesFlurane

Well after my commute today, it appears that the dropouts do occur at traffic lights.
As I hope you can see from the plot, as the speed drops as I approach a stop light the data drops and after I leave the data reappears.

ric_stern/RST

Are they data drops or do you just get nothing because you're stationary? In other words what happens if you cycle past a traffic light that is on green? Does the speed and power stay correct or does it disappear?

ric

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Alex Simmons

That's exactly what it looks like to me. Time doesn't stop for traffic lights! The rest of the long zero power sections look like coasting down some decent hills.

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ric_stern/RST

on second look, there appears to be one actual dropout at about 26 and a bit minutes - power disappears, speed drops to zero and then restarts (along with power) where they left off.

Ric

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gogoturtle

I am using a 2.4 SL and when I first looked at the files, for a second I thought that the hub was dropping the signal again. But, then I realized what Alex says above, these are not drops but the clock moving when I am waiting at the light.

I now have about 15 hours on my rebuilt 2.4 and I have not noticed a single drop when moving.

Thom_y

Finally, another cyclist who doesn't regard red lights as optional stops !

DesFlurane

Looking at the raw data, time continues but speed and power are blank.
It has to be a data drop, the transmission indicator goes off as well.
As this seems to only occur at traffic lights, when I'm stationary, I am happy to ignore this 'problem'.
Will email Saris and ask for their take on the issue.
The 26 minute drop, I'm sure I was going passed a speed trap radar!

Terry Ferguson

The PT cpu quits recording when the speed (or HR; selectable) goes to zero. That's the way it works. - TF

jetnjeff

Let me modify that, if speed or HR are zero for 9 seconds. At least that is the way it is suposed to work and what I have observed except for the following.

On some steep walking Uphill sections while MTBing, the CPU will stop recording anything less than sabout 2 miles per hour. At least on the wired version. Doubt this will change on the wireless, but do not have one for my MTB.

Terry Ferguson

The manual says:



If set on speed, "Trip time stops 3 sec. after if speed is not registered."



If set on HR: "...as long as a heart rate signal is registered."



TF

jetnjeff

Is the number of seconds settable?

Cause I watch the timer count for 9 seconds before stopping after stopping the wheel. AFAIK it is not settable. Of course this is when set to Data (Watts) not Speed.

I actually never set it to HR or Speed instead of Data, so I would default to the manual. Don't use the HR strap much

I have found the manual lacking in other areas.

DesFlurane

So when the transmission icon goes off that means what? The cpu is refusing the connection from the hub?
The recording stops when I'm still doing 7km/h, I suppose that I could stop before the next recording interval, 1.2 sec recording.

DesFlurane

The other thing that crossed my mind is, do all PT graphs look like this?

Terry Ferguson

I don't have a 2.4 to check, but on a Pro and in the 2.4 manual, 'data' is where you set it to either speed or HR - the only two choices. The number of seconds is not settable.

Agree that most manuals, Saris included, appear to have never even been read prior to printing. There are many mistakes and wording that looks like it has been translated from a foreign language. (WI isn't that foreign.) I bet they could cut their returns by 20% and their customer inquiries by 80% if they would just spend more time on their manuals.

TF