Antenna Tunning nrf51822

[samo]

Hi

We have developed the product where we are using the nrf51822 chip. Because we are using custom made PCB we have to make tunning of antenna for a long range of BLE module. I heard that when the tunning is performed the nrf51822 chip has to be loaded by a special program which broadcasts the entire range of BLE frequencies. In this case the tunning can be performed more accurate (estimated values of PI elements) compared to any other program. At this point, I would like to ask if my information is correct and if so please let me know where can I get the program for tunning or more detail information. Can we use for this purpose DTM application?

Best regards

Samo

[FormerMember]

The tuning consists of two parts:

1) Tuning the chip to 50 Ohm: Tuning the chip to 50 Ohm consists of tuning the matching network in the reference layout until you measure good output power across the band. In addition, it is important to verify that the harmonics, RX LO (center 2.79 GHz), and RX LO/2 are within the regulatory standard(s) in question. When doing this tuning, the radio should be in TX or RX mode, depending on the measurements. To set the radio in TX/RX mode, you can use the radio_test example in the SDK.

2) Tuning the antenna to 50 Ohm. For how to tune the antenna, please have a look at this whitepaper.