SDS100/SDS200: LCN Finder On Two Channel XPT System

[JASII]

Until now, I have mainly focused on Color Codes and System Type on the various DMR systems near me. Now I am starting to focus more on determining the correct LCN of some of the systems I have found.

One of the systems near me is just a two channel XPT system. I am using the LCN Finder function of my Uniden SDS100 to determine the correct LCNs. Right now it is displaying:

LCN Finder Searching...

Found LCN 1/2

I have saved it. Can I assume that there will have to be activity on the system to get the other LCN?

 

[kevino]

Until now, I have mainly focused on Color Codes and System Type on the various DMR systems near me. Now I am starting to focus more on determining the correct LCN of some of the systems I have found.

One of the systems near me is just a two channel XPT system. I am using the LCN Finder function of my Uniden SDS100 to determine the correct LCNs. Right now it is displaying:

LCN Finder Searching...

Found LCN 1/2

I have saved it. Can I assume that there will have to be activity on the system to get the other LCN?

When you say two "channel", do you mean two frequency? If so, I'm thinking that you might be able to program the system as two different sites - one named "low high" with LCN 1 being the lower frequency and LCN 2 being the higher one. The second site could be named "high low", with the LCN 1 and LCN 2 Freqs being reversed. Whichever site is passing traffic would be the correct LCN order. I've never tried this, but it would seem that there could be two possibilities as long as the freqs are LCNs 1 and 2.

 

[JASII]

That is a great tip. Yes, just two RF frequencies.

Thank you!

 

[JASII]

I am trying something else right now. I have 28 frequencies entered as a system, even though I know they are actually from various, unrelated radio systems. I am using the LCN Finder function. My desire is that it finds the correct LCN for them, even though they are from different systems.

Right now it is displaying:

LCN Finder Searching...

Found LCN 8/28

Hopefully, this will be quicker then programming multiple systems and checking each of them for the LCNs.

 

[u2brent]

If you know the frequencies are from different systems, Then they need to be in there own unique systems.
You''ll likely never get good results with the LCN Finder by mixing and matching frequencies together like you're doing it.

Also there is no reason to assume that two frequencies from a system are starting at LCN 1 & 2. They could be any number the system admin chooses to use..

 

[jonwienke]

I am trying something else right now. I have 28 frequencies entered as a system, even though I know they are actually from various, unrelated radio systems. I am using the LCN Finder function. My desire is that it finds the correct LCN for them, even though they are from different systems.

Right now it is displaying:

LCN Finder Searching...

Found LCN 8/28

Hopefully, this will be quicker then programming multiple systems and checking each of them for the LCNs.

Nope. You probably won't get any correct results doing that. You can't even mix frequencies from multiple sites on a single system.

LCN finder needs to run on the frequencies for a single site.

 

[JASII]

I have been experimenting with the LCN Finder function a bit over the past few days. I have intentionally programmed in frequencies from disparate trunked systems just to see if it correctly identifies the LCNs and if it matches what is posted on here.

I was pleasantly surprised that the LCNs found matched what is in the database. Could that be a mere coincidence?

 

[cg]

I don't think the LCN finder looks at the frequency list as a whole, just the traffic carried as each frequency goes active. If that is the case, you would be all set.

chris

 

[Ubbe]

LCN finder shows 8/28 as you have put 28 frequencies in that site. If you add unknown frequencies that do not belong to that site it will never say that it has found all LCN's. There's no signal in the data stream that tells how many LCN's there are in a site, but it might tell how many sites there are. If I use DMRDecoder it usually will say how many sites a CAP+ system has. Maybe DSD fastlane can do that as well. Don't know if they will do the same with XPT.

If you have found 8 LCN's then put those in a "proper" site with just those 8 and include in scan and try it out. If the display shows that it jumps out of the control channel frequency repeatedly, like it wants to jump to a conversation but can't find it and returns to the CC, then continue to do LCN Finder but delete the frequencies from that "test" site that already have a found LCN.

You can usually tell what frequencies that belongs to the same site as they should have the same signal strenght.

/Ubbe

 

[JASII]

So, when I am just getting started with a new system and I am not even sure if it is just a one channel Capacity Plus system, will using the LCN Finder function on a system with just ONE frequency in it give me good, accurate results?

 

[werinshades]

So, when I am just getting started with a new system and I am not even sure if it is just a one channel Capacity Plus system, will using the LCN Finder function on a system with just ONE frequency in it give me good, accurate results?

Yes...that's a good way to figure out if you're missing other frequencies. If you see an LCN of 2 for example, then you might have to search for LCN-1 which could also be the rest channel that carries voice when the other channel is active.