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Colorado DTRS Trunk Question

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Jul 6, 2006
Most sites in this system have 2 trunk groups,the group we scan (class FB2) and a second group assigned 821-823 mhz channels (class MO).What is the second group used for and how will they operate once activated?This is a Motorola Digital system.

Thank you.


Premium Subscriber
Apr 19, 2005
The 821 - 823 Mhz group are the input freqs to the FB2s. Each FB2 has a output freq and a input freq. In the 866 Mhz band, the output freqs are 45 mhz higher than the input freqs.

Try http://www.geocities.com/45peter/repeaters.html for a explanation of repeaters.

In FCC jargon - a 'FB2' is a repeater - a 'MO' is a mobile station (either a portable radio, or a car / truck radio)

Peter sz


Colorado DB Administrator
Database Admin
Feb 29, 2004
The "second group" in the 821-823 MHz range are for the MObile radios. Each site is comprised of repeaters, which have an input frequency (the MO class) and an output frequency (the FB2 class). The repeaters transmit on the FB2 frequencies and receive on the MO frequencies, while it is vice-versa for the mobiles.
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