LCN finder will only go to systems that you have programmed as a trunked system. It will not allow you to attempt to analyze a conventional system.
The systems I have been trying with little success are capacity plus. There is activity on the frequencies. The LCN finder fails to find ANY LCNs after several minutes to hours.
There is a one channel DMR capacity plus system, that it has failed to find the LCN as well.
Guessing will only lead to you receiving those frequencies you guessed correctly. Since the 436 does not show frequency information, it can be very difficult figuring out which ones you got right. Proscan has been very helpful, since it shows frequency info. I have also resorted to setting up different sites for the same system, with the frequencies given different LCN values. Again, without frequency information to help, figuring it out this way still remains difficult.
Attempting to monitor a capacity plus system as conventional would likely lock the scanner on the active frequency, if there is any delay set on the channel. The active channel on a capacity plus system sends out a data burst about every second.
In addition the promised advanced analysis features for P25 are still undelivered. The radio also lacks IF output or control channel output that would allow the use of additional software.
When there is a problem, admit it as soon as possible.
Customers are not stupid. Ignoring or denying a legitimate problem is not the way to handle it.