Is it any differance in schematic for long range achive

[Alan Ajit]

Dear Nordic,

I want to achieve long range in my custom board 

I have some doubts:-

1. is it any difference in schematic for achieving?

2. Which HF crystal i used for better performance(ppm?)?

3.Which LF crystal i Used for better performance(PPM?)?

4.Is it softdevice difference makes any effect in the long range(for eg:- reciver used s140 alpha and advertiser used S140_nrf52_6.0.0)?

Please clarify my doubts immediately i want to start designing my custom board

[Andreas]

Hi,

 

1. No, same schematic applies for all PHYs.
2. Per the BT spec there is a requirement that the TX frequency offset is less than +/-40 ppm, and this maps 1:1 with the crystal frequency. The nRF52840 will work with larger offset, but there is no guarantee that the other side of the link will. There is no performance to be gained by e.g. choosing a more accurate crystal, just make sure that net accuracy(tolerance, aging, loading etc.) is less than 40 ppm.
3. No difference in performance, but a more accurate crystal will allow the stack to use narrower RX windows, leading to lower current consumption.
4. There should not be any differences, but you should not be using an alpha version for other reasons.

 

Best regards,

Andreas