LTR Standard

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LTR Standard systems have no dedicated control channel. All control data is sent as subaudible data along with voice transmissions. Systems can have any number of channels from 1 through a maximum of 20. Each channel in the system is assigned a unique number (01 through 20) and these need not be sequential. Each subscriber radio must be programmed with all channels in the system in proper logical channel order (the same requirement as EDACS systems).

Uniden scanners that track LTR Standard systems require that the channels be programmed in proper logical order in order to properly monitor the system. Radio Shack scanners that support LTR Standard systems do not require that the frequencies be in proper order but tracking is less efficiently accomplished.

LTR Standard talkgroups are written in the format A-HH-GGG.

  • "A" is the area code and is either 0 or 1. The area code is the same for all talkgroups in a given system and is arbitrarily chosen by the system operator; the most common use is to simply distinguish between talkgroups on multiple systems.
  • "HH" is the home repeater number and has twenty possible values, 01 through 20. A talkgroup will always use its home repeater by default, unless it is already in use by another talkgroup. If the home repeater is in use, the controller will assign another free repeater at random. If no repeater is free (all are in use), then the radio will receive a busy signal.
  • "GGG" is the group number and has 254 possible values, 001 through 254.