HP1 extreme trunking activity monitor

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ffexpCP

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I rarely use this feature, so I'm not that familiar with it. Local towers are being rebanded so I've been using this quite a bit this week to find the new frequencies.

What does it mean when a LCN shows up, but no frequency is displayed?
 

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Jay911

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In my experience, at least on a P25 system (which is what I think you're listening to here), it means the LCN has been broadcast somehow but the corresponding iden has not been received yet. The 'iden' is what tells the scanner what frequencies each block of LCNs correspond to. Typically, on a P25 system, iden 0 is LCNs 0 to 4095, iden 1 is 4096 to 8191, etc.

Usually you see this on a weak signal, but you appear to have a good strong one if the signal strength indicator in your photo is correct. The five that you have without LCNs would correspond to idens 5 (twice), 9, and 10 (twice). Seeing as how all the other frequencies/LCNs are in iden 0 (they're all less than 4096), I'm still thinking that this was corrupted data from poor receive somehow.

Iden 0 in your system appears to be a base of 851.00625 and step of 0.00625, offset 0 (or I guess 851.00000, step 0.00625, offset 1, depending on your point of view). In the absence of any other identifiers for the values above 4096, those LCNs would correspond to frequencies in the 979, 1085, and 1123/1124 MHz range, far outside what's valid for the band.
 

ffexpCP

wizard of odd
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Thanks

This is the MPSCS P25 system.

Signal should never be a problem where I'm at. The tower is very close and I can see it out my window.
 
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