Hallo kann man den Polar OH1 Pulsarmgurt mit der Fenix 3 betreiben
Starts from FW update OH1 v. 2.0.10 from April 23rd, 2019, was added support of ANT+ protocol, so now yes, OH1 can be connected with F3:
https://support.polar.com/en/updates/polar-oh1-and-h10-firmware-updates