Here is an example. TX power of 30 dBm (1 watt) + 10 dB antenna gain = 40 dBm EIRP - Path loss (say 10 miles at 915 MHz) 116 dB + 10 dB RX antenna gain = -66 dBm RX signal level ----- Original Message ----- From: "Chuck McCown - 3" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; "WISPA General List" <wireless@wispa.org> Sent: Wednesday, July 16, 2008 5:31 PM Subject: Re: [WISPA] formulas behind pathloss+RSSI calculators?
> Tx power + antenna gain - free space path loss + rx antenna gain =rssi. > > ----- Original Message ----- > From: "Rogelio" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Wednesday, July 16, 2008 5:24 PM > Subject: [WISPA] formulas behind pathloss+RSSI calculators? > > >> I'm looking for the math behind this website >> >> http://www.distributed-wireless.com/calculators/pathloss_RSSI.html >> >> I know the free space loss calculation (20 * Log10 (frequency in MHz) + >> 20 * Log10 (Distance in Miles) + 36.6), but what is the connection >> between that and the RSSI at that distant point? >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
