I am not familiar with Concept 2 at all, but have you considered not pairing your HRM to the PM5, and pairing with the Garmin only, then I think you will be able to re-broadcast your heart rate to the PM5?
Intuitively though, I can't see how a connection to the PM5 can break the heart rate somehow...
One thing to point out - did you make sure you wet the back of your HRM strap first? Not doing that can cause odd behaviour, and as you say it improves after 10 minutes, maybe sweat is providing the moisture you need for a reliable connection and this is why it settles after this time...?
There may be problems with heart rate strap. My HRM did kinda the same thing in the past. It gave accurate HR when I first wear it but it started to give higher values reavhing 205 and later down to the right HR value. I just bought a different HR strap from Decathlon and just uesd it's strap with Garmin's HR module. It's working fine.
Hi, thank you both for the response. The HRM strap works just perfectly without pairing my fenix to the PM5, so I don't think the strap itself is the problem nor wetting it (though I do anyway). It's as if there is interference with the ANT+ connections between the fenix, strap, and PM5, but I thought that was one of the main points in using ANT+ vs bluetooth connection.
but I thought that was one of the main points in using ANT+ vs bluetooth connection.
Bluetooth is a 1:1 connection, ANT is 1:many so I'm struggling to see how pairing to the PM5 can change what your HRM is broadcasting, your PM5 is just a passive listener.
What is going on here?
Absolutely no idea!