Radio Signal Strength (RSSI) will drop the further away a receiver is from the transmitter it is receiving. 1/100th of a mW is -20dBm, 1/1000th of a mW is -30dBm and so on. Everytime the received power drops by 1/10th, the RSSI will drop by 10dB. Every time the received power drops in half, the RSSI will change by 3dB.5mW = -3dBm.25mW = -6dBm and so on. RSSI is usually expressed in dBm which is decibels relative to milliwatts of received power. Raveon GPS tracking products also include location (latitude/Longitude) with the RSSI information which makes RF propagation analysis very simple. All Raveon data radio modems have a built in RSSI indicator to help determine the signal strength of a received radio modem signal.
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