NS9710
Member
I am seeing in the database, LCNs in random slotting, I would imagine that there are a full set of LCNs and not just like 1, 8, 12, 14, or so?
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Finding new LCN frequencies.
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captclint
Mentor
Not necessarily. Sometimes, they only do ODD no's, and small systems may only have 2-4 active LCN's, with many licensed freq's inactive until the need arrises. The truth is that there is no method to the madness. However, if the system is in RR with all of those LCN's you mentioned, someone has probably spent a lot of time mapping, and there may not be any more.
You just have to try to map using all possible clues: Mapping an LTR System - The RadioReference Wiki
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ecps92
Member
The others could belong to a different Vendor (shared tho) for a different site, or they don't exist either, there is nothing that says you must have 1-4 before you can use a 5 or 6
There are technical reasons why older LTR systems used LCNs spaced out rather than 1/2/3/4. If the home channel were busy, they would use a round robin to determine the next channel to use. If using one, and it selected 1/2/3/4, no problem. But if it selected 5 or higher, it would use channel 1 (the next valid LCN). So, LCN 1 would get the assignment much more than any other LCN and would tax the transmitter much more than the others. By spacing out the LCNs used, each transmitter would have an equal chance of being selected by the round robin (10 may select LCN 13, not 1, if the LCNs went 1/5/9/13/etc.)
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