Best radio chip/s for the job?

[ionultd]

Here are my 2 scenarios:

1. I need a radio chip that will be used to form a mesh network in dense bush with each node up to 150m apart. Is this possible?
2. I need the best chip in long range communication and smallest size.

Thanks

[Martijn]

2.4GHz is not your best option. Our experience is that lower frequencies have more success over longer distances. Maybe look into 868MHz solutions or even 433MHz.

[Arnaud Nelissen]

You should stay in sub-GHz modules for ranges like that, especially if you don't want to consume lot of power. 433MHz or 868/915MHz depending your location and legislation that applies locally. 433MHz modules generally use a 2x longer 1/4λ wire antenna than the one used for 868/915MHz (16cm vs 8cm for example), but might provide increased range.

Have a look at the NRF905 or the NRF9E5 (SoC) from Nordic.

You could also use RFM69 (W@13dB or HW@20dB), RFM22B and RFM12B modules from Hoperf (I already experimented with the RFM69 on a mesh network implementation, it worked great).

[awneil]

Yes - it is a consequence of the Laws Of Physics that, other things being comparable, 433MHz is (almost) bound to give longer range than 2.4GHz

[ionultd]

Thanks for that info