What does CommShop say would be needed for a 25-watt GMRS repeater (5 MHz split) with 0.35 uV RX sensitivity?
George, KA3HSW / WQGJ413 ----- Original Message ----- From: "Eric Lemmon" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: <[email protected]> Sent: Saturday, August 30, 2008 1:52 PM Subject: [Repeater-Builder] RE: [EMAIL PROTECTED] VHF Duplexer > Tom, > > According to my CommShop duplexer isolation calculation software, a 600 > kHz > split at 2m with a 50 watt transmitter and a receiver with a (my > assumption) > sensitivity of 0.35 uV, about 87 dB of isolation is necessary to achieve > no > desense. If you intend to use two antennas, be aware that they will need > to > be separated by about 202 feet vertically or over three miles > horizontally. > Neither of these separations is practical for a portable repeater.
