RMRL Repeaters


The Rocky Mountain Radio League, Inc. owns and operates eight repeaters at sites along the Front Range of Colorado to serve its membership. All of the repeaters are based on a standard design employing General Electric MASTR II exciters, power amplifiers, and receivers, and S-COM Industries controllers. The design allows components to be exchanged between repeaters and a spare inventory the club maintains. A defective component can be easily ‘swapped out’, minimizing repeater downtime and eliminating the need for on-site repairs under adverse conditions.

Certain of the RMRL repeaters offer special features. The 145.340 machine is a node in the Internet Radio Linking Project (IRLP) network. This repeater can be linked to other repeaters around the world via the Internet. (See the Internet Connection page.) The 449.750 machine provides digital paging capability. The 449.825 repeater is linked full time to the 146.940 machine, extending its coverage into Boulder and other “shadowed” areas.

ALL RMRL repeaters require a 103.5 Hz CTCSS tone for access. The repeaters also transmit either a 103.5 Hz or a 127.3 Hz CTCSS tone. If your receiver has CTCSS decode, you can utilize this feature to reduce intermod and noise between repeater transmissions.

The 145.220 and 224.000 MHz repeaters have autopatch capability which supports long tone zero (LiTZ) emergency calling. The telephone line is shared between the two repeaters and may be in use at any given time. If you attempt to dial a number while the line is in use, the repeater will transmit ‘BZ’ (busy) in Morse code.


The RMRL has a crossband repeater regularly flown by the Edge of Space Sciences group.




Callsign Location Output Freq. Input Freq. CTCSS
WT0C Guy Hill 145.220 MHz 144.620 MHz 103.5 103.5 Up
KE4GUQ Evergreen 145.340 MHz 144.740 MHz 103.5 127.3 Up
W0WYX Squaw Mtn. 146.940 MHz 146.340 MHz 103.5 103.5 Up
N0MHU Guy Hill 224.000 MHz 222.400 MHz 103.5 103.5 Up
W0WYX Special Events Rptr 449.100 MHz 444.100 MHz 103.5 103.5 Up
K1DUN Squaw Mtn. 449.450 MHz 444.450 MHz 103.5 127.3 Up
KI0GO Guy Hill 449.750 MHz 444.750 MHz 103.5 103.5 Up
W0WYX Broomfield 449.825 MHz 444.825 MHz 103.5 103.5 Up