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Control Channel Only


Control Channel Only (CCO) is available in selected models when trunking Motorola systems. For the older Uniden scanners that utilize banks and lists only 800/900 MHz trunking is supported; it is available on all bands where trunking is supported in the Uniden scanners that support DMA.

CCO programming is recommended for use in selected RS scanners starting with the Pro-93 in bands where Motorola trunking is supported and this includes all P25 trunking bands for the Pro-96/2096 and the GRE PSR-500/600 scanners. It enables the user to trunk a system by programming in only those channels that are utilized as a control channel, instead of having to utilize memory to program the entire system. This mode works for both analog and digital systems.

In the RR database, these frequencies are marked in red for the primary control channel, and blue for any alternate control channel. Be sure to program both primary and any alternate control channels. An example can be viewed here . In this case there are 4 control channels; 2 primary and 2 alternates.

Note that if the control channel should change, and it isn't in the list, trunking using CCO will fail. You can thus use this mode to flag if any new control channels suddenly become active in the system.

Older Uniden radios require that a plan be programmed, as well as all the control channels, for CCO to work. RS/GRE radios including the New GRE radios, as well as the newer DMA based Uniden scanners, do not require a plan. In addition, no plan is required when utilizing CCO in the 900 MHz band.

The following scanners are known to support CCO:

Uniden Handhelds (See Uniden Plan Information below)
Uniden Base/Mobiles (See Uniden Plan Information below)
RS/Uniden Handhelds
RS/Uniden Base/Mobiles
GRE Handhelds
GRE Base/Mobiles
RS/GRE Handhelds
RS/GRE Base/Mobiles

Uniden Plan Information

For those radios that require a plan to use CCO, there are 4 possibilities;

  • PLAN 1: if the last three digits of ALL the frequencies in use end in one of the following three digits: 125, 375, 625, or 875 (example: 856.1125, 860.7375, 859.6625, 855.8875).
  • PLAN 2: If ALL the frequencies are less than 869.0000 and end in one of the following three digits (125, 375, 625, or 875) and if ANY other frequencies end in (000, 250, 500, or 750)
  • PLAN 3: If the last three digits of ALL the frequencies in use end in one of the following three digits (000, 250, 500, or 750)
  • PLAN 4: If ALL the frequencies are less than 866.0000 and end in one of the following three digits (000, 250, 500, or 750) and if ANY other frequencies end in (125, 375, 625, or 875)

Hints and Tips

If you need to trunk a multi site system (particularly if you are mobile, and moving from the coverage from one site to the next), programming a dummy channel will allow the scanner to move to another site better during inactivity from the current site. The following illustrates the programming:

  • Site001 868.17500
  • Dummy 1300.00000
  • Site002 868.22500
  • Site002 868.65000
  • Dummy 1300.00000

The dummy frequency could be any valid frequency that is unused in your area. Programming a used channel in this position could interfere with normal trunking. This tip works with the PRO-96 and 2096. (Thanks to user "fmon" for the tip and suggestion for the writeup)


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Some of this information courtesy of the Control Channel only tutorial page at the Scan Control website


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