Linux ANT+ Heart Rate recording stability.

[Pierre P]

My config :

• GoldenCheetah 3.7.1
• Linux Mint Cinnamon 22.3
• 2 connected devices : 
  • bike CardioStrong BX70i (via BLE) + 
  • Polar H10 via ANT+ using a dongle « Bus 003 Device 040: ID 0fcf:1008 Dynastream Innovations, Inc. ANTUSB2 Stick »

My problem : Heart Rate recording stability.

Instead of continuous recording, i have some line segments and sometimes some "stairs steps"

Last week was almost ok, a few segment a bit more on one day

This week :

• monday almost no segments,
• tuesday more segment at beginning and end of the training
• yesterday : many stairs
• today : almost only stairs steps, and total flat (stoped?) after about 12 minutes. 

I check the usb journal, no events so it looks like it’s a problem with GC and the sensor management.

Already checked : 

• The H10 is ok (I see it perfect on the bike), battery full.
• linux userid permission to use your usb device has been set
• I disabled power management for the dongle (control on + autosuspend -1 rule)

Other info : last reboot past saturday, I didn’t close GC since I ran it on monday (just disconnect after training and reconnect the following day for the next training).

Any probable cause ?
What should I do to help identify the problem ?

Thanks in advance

[Ale Martinez]

Electromagnetic interference, ANT+ is a connectionless protocol so when there is interference data is lost silently, using BTLE you would likely see dropped connections, and reconnections if you are using recent GoldenCheetah builds.

What should I do to help identify the problem ?

See https://github.com/GoldenCheetah/GoldenCheetah/wiki/ANT--and-BTLE-Troubleshooting#data-spikes-and-dropped-connections 

Thanks in advance

[Pierre P]

Thanks again Ale
what's very strange is that it's not every day the same, and when I was with windows I didn't notice any interference...

I'll probably have to try with a cable.

But if interference is the explanation, i still can't explain why it can vary so much from one day to another.

I just tested with --debug option (and with computer wifi off) :

[18:23:27.913] debug: 0 ANT SENSOR ID  120  DETECTED VIA CHANNEL ID EVENT
[18:23:27.928] debug: ** CONNECTION ESTABLISHED channel: 0 device: 5794 **
[18:23:30.130] debug: stale info for channel 0
[18:23:40.767] debug: start...
[18:31:24.135] debug: lost info for channel 0
[18:31:24.135] debug: 0 type= 1 device type= 120 freq= 57
[18:31:24.135] debug: 0 assign channel type RX
[18:31:24.136] debug: 0 assign channel type RX
[18:38:02.879] debug: lost info for channel 0
[18:38:02.880] debug: 0 type= 1 device type= 120 freq= 57
[18:38:02.883] debug: 0 assign channel type RX
[18:38:02.884] debug: 0 assign channel type RX
[18:38:32.874] debug: lost info for channel 0
[18:38:32.875] debug: 0 type= 1 device type= 120 freq= 57
[18:38:32.875] debug: 0 assign channel type RX
[18:38:32.876] debug: 0 assign channel type RX
[18:39:02.876] debug: lost info for channel 0
[18:39:02.877] debug: 0 type= 1 device type= 120 freq= 57
[18:39:02.877] debug: 0 assign channel type RX
[18:39:02.878] debug: 0 assign channel type RX
[18:39:32.878] debug: lost info for channel 0
[18:39:32.878] debug: 0 type= 1 device type= 120 freq= 57
[18:39:32.879] debug: 0 assign channel type RX
[18:39:32.879] debug: 0 assign channel type RX
[18:40:02.879] debug: lost info for channel 0
[18:40:02.880] debug: 0 type= 1 device type= 120 freq= 57
[18:40:02.880] debug: 0 assign channel type RX
[18:40:02.881] debug: 0 assign channel type RX
[18:40:32.871] debug: lost info for channel 0
[18:40:32.872] debug: 0 type= 1 device type= 120 freq= 57
[18:40:32.875] debug: 0 assign channel type RX
[18:40:32.875] debug: 0 assign channel type RX
[18:41:02.625] debug: lost info for channel 0
[18:41:02.625] debug: 0 type= 1 device type= 120 freq= 57
[18:41:02.626] debug: 0 assign channel type RX
[18:41:02.626] debug: 0 assign channel type RX
[18:41:32.126] debug: 0 type= 1 device type= 120 freq= 57
[18:41:32.126] debug: 0 assign channel type RX

Fisrt 7-8 minutes ok (bike wasn't on)

Then i powered the bike and run it (but without connecting it) and it looks that it is when powered that info is lost every 30 seconds, weird isn't it ?
But do you think it confirms the interference probable cause ?

Thanks again

[Ale Martinez]

El jueves, 14 de mayo de 2026 a la(s) 5:27:51 p.m. UTC-3, Pierre P escribió:

Thanks again Ale
what's very strange is that it's not every day the same, and when I was with windows I didn't notice any interference...

I'll probably have to try with a cable.

An extension cable is a good idea, new batteries for the H10 too.

Not really.

 

But do you think it confirms the interference probable cause ?

Pretty much, yes.

[Pierre P]

Thanks again, 

I did a reboot last night, this morning, with a 30cm extension cable (the only I had) it worked.

I checked the battery and change it two weeks ago it still almost 100%

Fingers crossed, i hope the cable will do the trick (and maybe I buy a longer one)

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