BLE difference between nrf51822 CDAB and QFAC

[unzeitig]

When I tried S110 examples like BLE proximity, beacon and hrs on QFAC, it works without any problem. Unfortunatelly I can not see any activity on pin VDD_PA of CDAB. Is there any difference between both chips from BLE point of view? How to simply debug it?

[unzeitig]

After removing of balun is result the same - VDD_PA is not on during radio activity. Regarding crystal oscillator - i am still begining with nfr51822 architecture - do you mean CPU is running from internal clock and BLE with high frequency crystal oscillator? Should be oscillation present on crystal terminals whole time when power is up or during radio activity only? It could be good direction.