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good Friis Transmission results

 
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BBoone900@gmail.com
Antenna-Theory.com Newbie


Joined: 07 Apr 2016
Posts: 1

PostPosted: Thu Apr 07, 2016 1:27 pm    Post subject: good Friis Transmission results Reply with quote

using a online Friis Transmission calculator I found out that my Received Power is 1.509e-9 mW. is that good or bad ? How do I found out ? I am using a zigbee
https://www.sparkfun.com/products/9099
https://www.sparkfun.com/products/9143

If I use this one http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_45_47&products_id=169,
I would get
Received Power: 9.433e-9 mW
but I do not know if that is good or not.
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coundpake
Antenna Theory Regular


Joined: 03 Aug 2016
Posts: 10
Location: San Jose, CA

PostPosted: Wed Aug 03, 2016 12:47 am    Post subject: Reply with quote

Whether the received power you've calculated is "good" or "bad" is dependent on the receiver's sensitivity level (will probably be specified - lower is better) which you want to be above by at least 3dB.

The Receive (RX) Sensitivity will probably be in dBm (something like -80 to -120 dBm). If your calculated power is 1.509e-9 mW or -88.2 dBm, you're going to need an RX Sensitivity of ~ -91.2 dBm or lower.
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