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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.

[coundpake]

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.