nRF51822 custom board is not radiating

[Ashlin]

I have made a custom board by following the reference design given in the nordic website using 2450BM14E0003 Balun and 2450AT18B100E chip antenna from Johannson technology.But after loading the program onto the chip, it is not radiating at all.I have followed he reference layout given in the Johannson Technology datasheer for using the Balun.I am not able to understand what went wrong. Top side layout

Bottom side layout

Schematic

[Jørn]

Could you please post a picture of your circuit schematic as well? Also please post a a picture of your layout mid and bottom layers.

[Ashlin]

Hi Jorn .I have added the circuit schematic and bottom side layout image as well.I have used 2 layer FR-4 board with 0.5mm substrate thickness.

[MartinBL]

1. Are you able to get non-radio examples to work? For example a simple LED blinky example?
2. What kind of 16MHz crystal do you use? Are the two unconnected pins really supposed to be left unconnected? Are you sure they are not supposed to be grounded?

[Ashlin]

HI I got the board to work.I had wrongly configured the radio to use the external 32KHz oscillator for BLE stack .But I am not using external 32 KHz crystal.When I change it to use the internal RC oscillator the board works fine.

[Darshan]

can i know how did you change it to use internal RC oscillator.Any changes in code in ble_stack_init().