right subGHz radio modules and their range

[kumarnaveenb]

Hi,

I am trying to use subGHz RF modules in my design. I have following questions. It would great if any one could answer these questions. I am trying to build sensor nodes + Gateway. Planning to use mesh over sub GHz.

1. What is the difference between S2LP, SPIRIT1, SPSGRF and SPSGRFC.
2. out of S2LP, SPIRIT1, SPSGRF and SPSGRFC which one is best suited for quick prototyping
3. After designing the solution do we need to have FCC certifications again? even for SPSGRF and SPSGRFC.
4. All sub Ghz radios supported by Contiki stack?
5. Out of above transceiver modules which one provide long range with Low power.
6. WHat is the advantage of using 3 party radios based on SPSGRF . That is, radio controli etc..

I have ordered EV kits SPSGRF. I will explore more.

Thanks,

Naveen

[AndyR1]

Hello Naveen,

I'm building sensor nodes + gateway too, i use bluenrg + s2lp, i would like to add this about s2lp range :

At the end of 1.1 https://www.st.com/resource/en/application_note/dm00718575-radio-communication-range-estimation-in-ism-band-stmicroelectronics.pdf, the result is 54km, but i can't redo this even with values, is it 10^(126-20*log10(868)-32.44) or am i missing something ?

Thanks,

Andy.

[kumarnaveenb]

Hi Andy,

it looks like that equation is wrong. division of 20 is missing.

it is suppose to be

d = 10 ^[(126-(20*log10(868))-32.44)/20] = 54.88

FSPL′dB= 20×log10d+20×log10868MHz+32.44.

you can refer to above equation or eq 6 in the document.

Naveen

[Winfred LU · Accepted solution]

SPIRIT1 --> SubGHz transceiver generation 1

S2-LP --> SubGHz transceiver generation 2 (S2 for SPIRIT2)

SPSGRF --> SPIRIT1 based module with on-board antenna 

SPSGRFC --> SPIRIT1 based module with UFL connector

You will need to certify FCC for the end product.

Contiki stack is software based, which means all these products shall be able to support.

Both SPIRIT1 and S2-LP provide long range transmission with low power.

[kumarnaveenb]

Thanks Winfred.