# QPSK application for custom board

**URL:** <https://discuss.pynq.io/t/qpsk-application-for-custom-board/8745>\
**Category:** Support\
**Created:** [September 15, 2025, 11:58am UTC](https://discuss.pynq.io/t/qpsk-application-for-custom-board/8745 "2025-09-15T11:58:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![vrb](https://avatars.discourse-cdn.com/v4/letter/v/46a35a/32.png) [@vrb](https://discuss.pynq.io/u/vrb)\
**Post date:** [September 15, 2025, 11:58am UTC](https://discuss.pynq.io/t/qpsk-application-for-custom-board/8745/1 "2025-09-15T11:58:47Z")

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![image](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/a/a4c9c7476340164892e7d2d33181f122497b7c32.png)

Hi @marioruiz , I’m trying to validate QPSK application for 49DR custom board. The board crashed while loading the overlay. Can you help me out with this.

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**Author:** ![vrb](https://avatars.discourse-cdn.com/v4/letter/v/46a35a/32.png) [@vrb](https://discuss.pynq.io/u/vrb)\
**Post date:** [September 16, 2025, 6:14am UTC](https://discuss.pynq.io/t/qpsk-application-for-custom-board/8745/2 "2025-09-16T06:14:33Z")

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Hi @davidnorthcote @marioruiz, any changes should I make for custom boards.

 ![image](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/a/a7eed0366d83381962fd97707ae4ecca9fd11b80.png)

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<div class="post-metadata">

**Author:** ![vrb](https://avatars.discourse-cdn.com/v4/letter/v/46a35a/32.png) [@vrb](https://discuss.pynq.io/u/vrb)\
**Post date:** [September 18, 2025, 10:24am UTC](https://discuss.pynq.io/t/qpsk-application-for-custom-board/8745/3 "2025-09-18T10:24:28Z")

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![image](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/4/465ed285dd46b800339db884a9287290dd9a7331.png)

 ![image](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/f/f5c54a4c8732fe173f78232d4b994a44cafdecd5.png)

Hi @marioruiz @davidnorthcote , Here we are not configuring clocks during the execution of the rfsoc radio application in jupyter notebook. Clocks are already configured for us. I can’t set self.adc\_tile.DynamicPLLConfig(1, 409.6, 1024) and self.dac\_tile.DynamicPLLConfig(1, 409.6, 1024). When I try to execute without that, board hanging at the below part which comes under DAC configurations. Can anyone help us out?  
self.dac\_block.UpdateEvent(xrfdc.EVENT\_MIXER)  
self.dac\_tile.SetupFIFO(True)