We are considering installing a 2-meter repeater, standard 600 kHz spacing, with separate antennas for transmit and receive, looking at phasing together 2 DB-228's for RX and 2 DB-228's for TX and using a high-power transmitter, such as a Motorola Nucleus at 250-300w or other high-power transmitter.
Does anyone have a formula or know what formula would need to be used to determine the amount of vertical separation needed to provide the isolation required for such a duplex operation? We are wanting separate TX and RX antennas because of plans to have the repeater on a platform located 1200' in the air, and heliax runs are not practicable. -- James Adkins, KB0NHX
