nRF24L01+

[JasonWu]

Dear Nordic engineer,

        Here is a question when we use the chip's automatic response function, the MCU PRX can download the packet, but PTX can not receive the ACK signal every time. I want to know why this is the case, or what causes the ACK signal can not always be received.

        We are extremely anxious to know why, which is very important for our products to achieve mass production. Hope you to answer it as soon as possible.

        Thanks

        Best wish!

Jason

[ketiljo]

There can be many reasons for this. You can noise or disturbance on the channel (WLAN etc), the sensitivity may be low due to antenna or layout issues, the crystal frequency may be wrong. 

Can you post the schematic (nRF24L01+ part only), layout of the RF section and antenna and the crystal spec please?

 

[JasonWu]

I'm terribly sorry to sort out the data for so long.The attachment section of the mail has the information you need.(the schematic (nRF24L01+ part only), layout of the RF section and antenna and the crystal spec)

Reriver1.0 Sch.pdfDetailed information.docx

[ketiljo]

Try connecting the shield of the coax cable to the module, the antenna won't work well without this. So it's possible that it's the antenna that causes the ACK to be lost. You might be better off using the U.FL connector that was (?) on the module with a corresponding connector on the antenna coax.

Note that if you get the module from another place than our distributors, it's a chance that the nRF24L01+ chip may be counterfeit and may have reduced RF performance. 

[JasonWu]

Thank you for your answer. We will connect the coaxial cable to the module according to your method. Then test the receiver performance.          

However, according to your method, there will be some electromagnetic compatibility problems, such as electrostatic discharge immunity test. Static electricity will enter the PCB board through coaxial cable, causing damage to the equipment.

[JasonWu]

Do you have any good ways to solve this problem?