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An L.T.R. Mystery

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I have noticed some systems, in the databse, stating "Confirmed L.C.N.s" but no Talk Groups where listed. How can this be? How does one know what the correct L.C.N. orders is without any L.C.N.s being listed?
 

pfish

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Some scanners (like the pro-97) can tell you the LCN of that frequency when it does the data burst. For instance, I know all of the LCN's for a system here, but there is no traffic on it.
 

hcpholder

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Two Second Interval Systems

pfish said:
Some scanners (like the pro-97) can tell you the LCN of that frequency when it does the data burst. For instance, I know all of the LCN's for a system here, but there is no traffic on it.

What about systems with 2 second intervals, with changing LCN's ? I have such a group in my area, which the frequencies are not listed anywhere!
 

EricCottrell

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hcpholder said:
What about systems with 2 second intervals, with changing LCN's ? I have such a group in my area, which the frequencies are not listed anywhere!

It is likely using Passport. Passport can not be trunktracked with a scanner. Any LCN's are false decodes. You can listen to it conventionally if you turn off the delay. It is possible to decode it with a low-pass filtered data slicer and a computer.

What frequencies and area are you picking this up?

73 Eric
 
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