Particle Core to RFM12B connection questions

Hi all,

I’m trying to use a RFM12B module in order to control some radio switches (hopefully not rolling code type - I do not know right now).

The connection schema for arduino looks like that:

My questions are:

  1. the 10k pull-down for spi are a must or can I ignore them?
  2. the 4.7k what are good for?

Thank you for your help, and please excuse me for being a hardware noob.

I’m going to answer this question after more than 1 year.
The 4.7kOhm resistors look like they enable using the board with 5V systems. You can ignore them if you use 3V3. As to the 10kOhm pulldowns, I think they serve the same purpose, compatibility with 3V3.