LTRDump; How to interpret Data?

[FPO703]

I've gotten data via LTRDump.exe on a local LTR system.

I just don't know how to interpret it.

Here's what I got so far on this 10 channel system:

on frequency 422.2875
Area: 0 (Unknown) C:11 H:11 G:168 F:25

on 422.5125
Area: 0 (Unknown) C:2 H:0 G:190 F:1

on 422.6375
Area: 0 (Unknown) C:0 H:21 G:10 F:6

on 422.8625
(Unknown Type 15) DCC:1 C:263 S:2 G:32855 f:2047

on 422.9875
Area:1 (Unknown) C:24 H:12 G:130 F:16

on 424.5375
(Unknown Multinet) C:838 H:8 G:0 F:804 U:7168

on 424.9125
Area: 0 (Unknown) C:0 H:0 G:0 F:0

 

[DaveH]

I've forgotten what C is but the others stand for Home, Goto, and Free (repeaters).

Looks like you have a fair bit of bogus data which is typical if you don't have a low-pass filtered slicer. A repeater number of 0 or above 20 is bogus. 422.8625 doesn't look like the others; it must be an LTR variant, Passport or Multi-Net.

If you manage to get a consistant Home Repeater (notice I don't call them LCNs) on each channel, that will give you the HR ordering. The rest is nice, telling you what other free channels exist, so you can figure out (eventually) if you have all of the channels in the system.

Eric Cottrell came up with a discrete filtered LTR slicer using one quad op-amp, plus a bunch of resistors and capacitors, if you're interested. I plan to build one myself.

Dave

 

[FPO703]

So, how do I determine where this particular channel that I'm monitoring fits into the grand scheme of things?

Is this contained in the ltrdump.txt file?

 

[FPO703]

I got this one one of the frequencies in question

========================
Fri Oct 1 15:42:25 2004 Dumper Version 5-May-2004
========================
243c804f6bcecae Multinet -> 243c804f6bcecae LCN 246 Free LCN 135 Active -> Group: 18-1 User 6045
========================
Fri Oct 1 15:47:05 2004 Dumper Version 5-May-2004
========================
3a43921d8000007 Passport DCC: 1 LCN 0 Free LCN 1680 Active -> Group: 114-17328

 

[DaveH]

The HR numbers (OK I'll call them LCNs) are necessary to program thge system into a Uniden scanner, similar to EDACS (the RS PRO-92/2067 scan for sub-audible data and don't need the ordering).
I don't know how to interpret the Multinet/Passport stuff. It may or may not be "real".

Dave

 

[EricCottrell]

Hello,

The stuff you posted looks like noise. It is common when monitoring the channel without a signal. That is why I added the time stamps so the frame rate can be determined. If you read down this thread
http://www.radioreference.com/modules.php?name=Forums&file=viewtopic&t=10074
you will come across my post on what good decodes look like.

73 Eric