Actions
Forum Thread Details
  • Replies 9 replies
  • Subscribers 533 subscribers
  • Views 1192 views
  • Users 0 members are here
Related

LoRa or wifi ..... max received signal strength -20bBm?

davebullockmbe

Can someone explain why no matter how close I place my two Lora evaluation modules next to one another (or my phone to my wifi hub) I never achieve a signal strength higher than -20dBm?

Is there some form of AGC in the receivers that prevents the input from exceeding -20dBm input, or do the TX/RX combinations communicate with each other to throttle back the TX power?
I have been bemused by this when fiddling with wifi in the past,  but now I find that Lora is exhibiting the same behaviour despite the specified TX power being much greater and the antennas almost touching one another.. 
Clearly I am missing something? 
Can someone point me to the idiot's guide as to why this is occurring please?

Thanks
Dave

Parents Reply
  • in reply to acdc90

    Phone as a test instrument?
    Not really, just as a demonstration to test my notion that these devices seem to ignore the laws of physyics once a certain signal strength has been reached.
    Where a simple signal strength meter will display stronger and stronger signal the closer one gets to the signal source, readings around -20dBm seem to be the limit when testing with LoRa modules or a mobile phone.
    It was just bothering me as to why the signal strength appeared to limit.
    Dave

Children
No Data