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900MHz Repeater System

The WCARC is developing two linked repeaters using the following proposed frequencies and proposed call signs:

  • Repeater Input 902.100MHz (+25) (i.e. Repeater Output 927.100MHz) VE3WCC in east. Continuous tone of 100Hz. To be Confirmed
  • Repeater Input 902.200MHz (+25) (i.e. Repeater Output 927.200MHz) VE3WCC in west. Continuous tone of 100Hz. To be Confirmed

    Note that the US National FM calling channel is simplex channel 927.500MHz and we propose the same one in Canada. The channel is at the high end of the band because most commercial surplus trunking radios will transmit simplex up at the top of the band but not at the bottom.

    The RAC Bandplan FM calling channel is simplex channel 904.500 MHz

    Band planners, particularly in Canada, may want to consider the following information which summarizes the situation correctly. http://en.wikipedia.org/wiki/33_centimeters#The_33_Centimeter_Band_Today

    Each repeater uses:

  • a modified Maxtrac 800 receiver
  • a modified Maxtrac 900 transmitter
  • a repeater controller
  • filters and duplexers
  • a Maxrad MFB-9153RPC vertical omni directional antenna

    Expected Time Frames

    We have revised our schedule and hope to have at least one repeater operational by winter 2008.

    User Radios

    The easiest commercial radio to use for the 900MHz band is the Motorola GTX900 mobile and its corresponding GTX900 handheld. They will require programming using proprietary software and a proprietary interface. These radios are available occasionally on eBay. There are several technical discussions about using this equipment, so do some searching.

    The mobiles will need a small 16 pin option plug for the rear of the radio and they may also benefit from a "constant power mod", although this is not mandatory. In addition, you will need a vertical antenna (preferrably with a few dB of gain), and the appropriate connector to connect to the radio. The antenna connector is a miniature-uhf type. There were some old 860MHz cellphone antennas available at Princess for $5 but with the wrong connector (they had a TNC) so either cut the old one off and install a new one or buy an adapter.

    The GTX hand held uses a recessed reverse sma connector, similar to what is used by 2.4GHz wifi equipment. Adapters can be found on the web.

    Project Team

  • Ken (VA3KA)
  • Rick (VE3CVG)

    Other Repeaters in the area

    For our other repeaters see Repeaters button (above).



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    This page was updated on May 12, 2010 and is Copyright © 2004-2010 by West Carleton Amateur Radio Club