Decoding LCNs

[compwhiz808]

Is there a way of decoding the LCNs from an EDACS site. I have the frequencies, but can't seem to get the right order. Does Unitrunker do this?

-Adam
KD0BML

 

[Forts]

No it won't.... it's up to the end user to link the LCN to the proper frequency. This is fairly simple on a busy system if you have 2 scanners. Use one scanner to drive UniTrunker so you can see whats happening. Enter all the frequencies into the other scanner, in no particular order. Now, just sit on each of those frequencies, one at a time, until you get activity on it. When that frequency is active, take note of which LCN shows as active on UniTrunker. If more than one is showing active, then it's just a matter of timing the activity on the screen to the activity on the radio to know which LCN you are on. It can be a little tedious, but it works. And of course, this assumes you have a 2nd scanner at your disposal.

 

[ElroyJetson]

If you have a good spectrum analyzer available to you, it comes in handy, too. Set the span and center frequency so that all system channels are in the displayed range at once, and mark them individually so you know which is which. Using your trunking scanner, keep
a close watch on things. You'll have the LCN order pretty quickly that way.

But this only applies if you have a good spectrum analyzer at your disposal, of course. Not everyone does.

 

[DaveH]

If you have an old PRO-92 or PRO-2067 or can borrow one, it could
help. When parked on the control channel (programmed in EDACS mode
of course), when idle it will display CTL-xx where xx is the LCN of the
channel you're on. When a TG becomes active the display changes to
xx-yyyy where xx is the active channel LCN, and yyyy is the TG in decimal.
Couple this with a second receiver and as long as you know the system
frequencies, the LCNs can be deduced (best to pick a quiet time when
only one TG is active and cycles through all active voice channels). Too
many TGs active at once will cause the display to "flit" among them, which
can be confusing.

If the control channel rotates, you can pick off those LCNs without any
voice activity.

Dave

 

[Gilligan]

What system are you trying to determine the LCN for?

 

[crayon]

No it won't.... it's up to the end user to link the LCN to the proper frequency. This is fairly simple on a busy system if you have 2 scanners. Use one scanner to drive UniTrunker so you can see whats happening. Enter all the frequencies into the other scanner, in no particular order. Now, just sit on each of those frequencies, one at a time, until you get activity on it. When that frequency is active, take note of which LCN shows as active on UniTrunker. If more than one is showing active, then it's just a matter of timing the activity on the screen to the activity on the radio to know which LCN you are on. It can be a little tedious, but it works. And of course, this assumes you have a 2nd scanner at your disposal.

Excellent sumation.

:wink:

 

[tglendye]

I have an EDACS system here (Harrisonburg/ Rockingham County, VA). It's Pro-voice, but has a couple of analog TG's. I might try to play around with this... but where do I download unitracker from?

BTW, thanks for the above info.

Thanks,
Todd

 

[relicwr]

I have an EDACS system here (Harrisonburg/ Rockingham County, VA). It's Pro-voice, but has a couple of analog TG's. I might try to play around with this... but where do I download unitracker from?

BTW, thanks for the above info.

Thanks,
Todd

The Downloads section (wiki)

 

[loco-lee]

If you have a good spectrum analyzer available to you, it comes in handy, too. Set the span and center frequency so that all system channels are in the displayed range at once, and mark them individually so you know which is which. Using your trunking scanner, keep
a close watch on things. You'll have the LCN order pretty quickly that way.

But this only applies if you have a good spectrum analyzer at your disposal, of course. Not everyone does.

I have access to an Anritsu spectrum analyzer and various scanners - how do I figure this out? I need more info? Please help? What do I do and how does it give me the order - please reply.

 

[tglendye]

The Downloads section (wiki)

I forgot to say "Thanks"!