TACX Neo - speed issues when in Train mode

[eclipse98]

Hi All,

Tested training mode with Video (avi), pgmf, rlv and I am getting strange speed drop out readings which seem to pop up every 5-6 seconds and make video mode almost unusable as it affects video playback speed (jerky, stop and go).

This is data from workout file - notice speed drops from 8.12 to 4.24, then back to 8.15 the next second while the distance traveled/power/cadence remains consistent - it looks like the data is in m/s, 4.24 corresponds to 15.3 km/h. What I noticed is that if your speed is above 15.3 km/h, it drops to 15.3 km/h every 5-6 seconds or so. If you ride below 15 km/h, then it starts dropping to 10.2 km/h.

I tested it in video mode and then in manual erg and slope mode with same issue - below is 3 seconds extract from workout file.

I've been using my Neo with BKool for almost 2 months and did not notice the same issue - any help will be appreciated, I can upload the whole workout file if it helps.

Thanks !

***********************************************************************************************************************************

-<Trackpoint>

<Time>2016-01-12T02:14:34Z</Time>

<DistanceMeters>2862</DistanceMeters>

-<HeartRateBpm xsi:type="HeartRateInBeatsPerMinute_t">

<Value>116</Value>

</HeartRateBpm>

<Cadence>77</Cadence>

-<Extensions>

-<TPX xmlns="http://www.garmin.com/xmlschemas/ActivityExtension/v2">

<Speed>8.12</Speed>

<Watts>196</Watts>

</TPX>

</Extensions>

</Trackpoint>

-<Trackpoint>

<Time>2016-01-12T02:14:35Z</Time>

<DistanceMeters>2869</DistanceMeters>

-<HeartRateBpm xsi:type="HeartRateInBeatsPerMinute_t">

<Value>116</Value>

</HeartRateBpm>

<Cadence>78</Cadence>

-<Extensions>

-<TPX xmlns="http://www.garmin.com/xmlschemas/ActivityExtension/v2">

<Speed>4.24242</Speed>

<Watts>198</Watts>

</TPX>

</Extensions>

</Trackpoint>

-<Trackpoint>

<Time>2016-01-12T02:14:36Z</Time>

<DistanceMeters>2876</DistanceMeters>

-<HeartRateBpm xsi:type="HeartRateInBeatsPerMinute_t">

<Value>116</Value>

</HeartRateBpm>

<Cadence>78</Cadence>

-<Extensions>

-<TPX xmlns="http://www.garmin.com/xmlschemas/ActivityExtension/v2">

<Speed>8.155</Speed>

<Watts>195</Watts>

</TPX>

</Extensions>

</Trackpoint>

[Jon Escombe]

It's likely a problem with the interpretation of the data on the speed/cadence channel (is known to affect other Tacx trainers).

If you do the pairing process again, but set the s&c channel to unused, that should fix it.

Regards,
Jon

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[eclipse98]

Jon,

That fixed the issue, video nice and smooth now, no more drop outs, thanks a lot for your help !

Also, thank you for information on slope value, who would have thought it would be in the 'target power' - I was kind of wondering why my target power % were so low when I was pulling close to my CP :)

You wouldn't by any chance know what I should put in the source attribute value if I want to display slope in video overlay ?

Thanks again !