Grand Mesa Repeater Association

Mt. Calahan Site- 449.800 107.2 PL
The Mt. Calahan site is located northwest of Parachute in Western Garfield County.  Calahan was funded by the Garfield County Board of County Commissioners, site space was provided by The Garfield County Regional Communications Authority and additional support was given by Sheriff Lou Vallario, Commander Jim Sears and the Garfield County Sheriff’s Office.

98 resides inside of the Calahan State DTRS building and is the most secure site currently on the GMRA system.  Site access is limited by both HID card access and is under video surveillance at all times.
The main repeater antenna for 98 is a 6db stationmaster that’s set at the 45’ mark on a 60’ SSV style tower.  The antenna is fed by 7/8” hard-line.
98 receives its GMRA feed via a full duplex link from Blackridge.  The link antenna is a 5 element end fed, enclosed gamma match yagi.  The yagi sits at the 30’ mark on the tower and is fed by 1/2" hard-line.
The 98 repeater is a modified high-power Motorola MSF-5000 providing 125 watts after a set of TX-RX Vari-notch duplexers.  The two link racks are each comprised of a set of Motorola CDM-1225s.  The top link rack is the full duplex link to Blackridge and the lower link rack is the hub repeater where the planned Sunlight and Monument Peak repeaters will link into.  The site is controlled by an Link Communications RLC-3 Controller.  In addition to battery back-up, the site is also supported by a 30KW Honeywell generator with 500 gallons of liquid propane on site.
Thanks to our tower rat KB0YNA who, despite the cold weather, always manages to come through for us!!