Hi Adrian,
Yes Orange Pi Zero has not enough memory to run QRadioLink , maybe when we use Orange Pi Zero 3 with 2 or 4Gb RAM and OZPI Zero v3 has faster CPU it is possible run QradioLink but I use Orange Pi Zero v1.x which has 512 Mb RAM is not good for QRadioLink for this reason I am looking to connect audio svxlink via UDP across network :-)
73 Waldek