Agenda - Public Works Committee - 11/15/2011

Home

Technical Details The system draws the equivalent power usage of a 60w light bulb. This would be a "Remote Receive" site for the system. The MAIN 146.850 MHz repeater transmitter is located on one of the City of Oakdale's 180 foot high water tanks located just north of the intersection of Interstate Highways 94, 694 and 494 on the eastern edge of the Twin Cities Metro Area. Our repeater transmit antennas are mounted on the top of this water tank. The 146.850 MHz transmitter used as the MAIN transmitter at Oakdale, is a solid state 500 watt continuous duty transmitter set at 450 watts of RF output power. It feeds a CELWAVE Super Stationmaster (fiberglass stick) antenna mounted on top of this 180 foot high tank by 200 feet of 7/8" Heliax cable. Our calculated output power from this transmitter is about 1000 watts ERP (Effective Radiated Power). This transmitter site and equipment provides a solid signal in a 60 mile radius circle of coverage (suitable for mobile and handheld radio operation) from its location about 300 feet above the average terrain in the Twin Cities area. 146.250 Remote Receiver sites What makes the 25/85 repeater system operate so well are the multiple receiver sites used to pick up the transmitted signal on 146.250 MHz. Each of these six remote receive sites are linked to the White Bear Lake "Repeater Central." Many of the receive sites share sites with other Amateur Radio or Business Band repeater systems. The antenna will need to be mounted on top of the South side of water tower #2. The highlited antenna in the photo is similar to what would be mounted on top of the water tower.