Detailed Answer
Link budget = transmit power + antenna gain − free-space loss − obstruction loss − receive sensitivity margin. Taking the LIDER LD series as an example: 10mW (10dBm) + antenna gain 2dBi − free-space loss (about 92dB for 470MHz @ 200m) − receive sensitivity −110dBm gives a link budget of about 30dB margin, enough to overcome typical environmental losses. The larger the link budget, the more reliable the communication. Refer to the link budget to assess the actual communication margin when selecting.
| Formula | Ptx + Gantenna − Lloss − sensitivity |
| LIDER | About 30dB margin |
| Conclusion | More margin = more reliable |
Note:For complex environments, ask the supplier for a link budget explanation.