• To anyone looking to acquire commercial radio programming software:

    Please do not make requests for copies of radio programming software which is sold (or was sold) by the manufacturer for any monetary value. All requests will be deleted and a forum infraction issued. Making a request such as this is attempting to engage in software piracy and this forum cannot be involved or associated with this activity. The same goes for any private transaction via Private Message. Even if you attempt to engage in this activity in PM's we will still enforce the forum rules. Your PM's are not private and the administration has the right to read them if there's a hint to criminal activity.

    If you are having trouble legally obtaining software please state so. We do not want any hurt feelings when your vague post is mistaken for a free request. It is YOUR responsibility to properly word your request.

    To obtain Motorola software see the Sticky in the Motorola forum.

    The various other vendors often permit their dealers to sell the software online (i.e., Kenwood). Please use Google or some other search engine to find a dealer that sells the software. Typically each series or individual radio requires its own software package. Often the Kenwood software is less than $100 so don't be a cheapskate; just purchase it.

    For M/A Com/Harris/GE, etc: there are two software packages that program all current and past radios. One package is for conventional programming and the other for trunked programming. The trunked package is in upwards of $2,500. The conventional package is more reasonable though is still several hundred dollars. The benefit is you do not need multiple versions for each radio (unlike Motorola).

    This is a large and very visible forum. We cannot jeopardize the ability to provide the RadioReference services by allowing this activity to occur. Please respect this.

LTR Channel Schemes

Not open for further replies.
Dec 19, 2002
West of the Muddy Creek, East of the Big Hill.
Here are the normal LCN Schemes for programming an LTR system.

LCN 1, 5, 9, 13, 17

LCN 4, 8, 12, 16, 20

LCN 2, 6, 10, 14, 18

LCN 3, 7, 11, 15, 19

Some LTR systems are programmed with the highest frequency as being the first LCN.
There are many LTR systems that have the lowest frequency as being the first LCN.
A few LTR systems does not have an certain type of frequency order.


Forums Veteran
Super Moderator
Dec 16, 2000
Sitting in an airport somewhere
I wish all systems were that normal. Nowadays they don't need to follow those arrangements due to the data buss restrictions that used to exist, and required the gaps.



Jul 29, 2001
Ottawa, Ont.
I don't believe the gapping was so much due to the controller internals
as it was to allow HR "aliasing". Trunked channel groups (at least in the
US) seem to have been handed out in 5-channel increments. The gaps
were meant to allow itinerant mobiles who did not have a valid HR on
a system they were visiting (legitimately), to be "aliased" onto an existing
HR. Spreading out the channels that way allowed for maximum flexibility.
And if two or more smaller systems ended up merged, if they had
non-overlapping plans, might make things a bit easier.

As for HR numbering, I've seen everything: reverse-ordered by-5,
systems with different plans merged or HRs added, and some with
increments of 1.

Last edited:


Dec 8, 2005
The channel gaps are there because the "free" repeater is determined by which one last transmitted on the bus. If they are all bunched up 1,2,3,4,5 then number 5 gets by far the most "free" hits because it also gets used for slots 6,7,8,9,10,11...20. Now if you spread those 5 out on 1,5,9,13,17 then 1 gets slots 1,2,3 and 4. 5 gets slots 5,6,7, and 8. And so on. That way they all get relatively even loading.

Newer controllers have nothing to do with it, if it is LTR it follows this format, period. Some of the legacy stuff is quite restrictive in this way.

Frequency has nothing to do with anything really, the controller has no idea what frequency the radio is on.



Premium Subscriber
Dec 19, 2002
Fort Erie Ontario Canada
FM Comm Frequencies

joespca said:
Hi any one here know the FM communicationsLTR system frequencies?
The Frequencies for Fm Communication Systems are in the data base on this web site, all 7 different systems, is this not what your looking for ??, several people are working on posting the information for these 7 systems.\


Don't hijack threads!

You've already asked about this in the New York forum, which is the correct place for your question. Do you think everyone's trying to keep the frequencies secret or something?
Not open for further replies.