Determining LTR order with Pro-92

[b52hbuff]

I seem to recall that there was a tutorial on how to determine the LTR
LCN number using a Pro-92. I know that the Pro-92 doesn't require
LTR frequencies in LCN order. But I'd like to be able to program Uniden
radios that _do_ require proper order.

Thanks!

 

[pro92b]

The PRO-92 is good for finding LTR frequencies but not repeater numbers. Looking at the talkgroup ID's will tell at least one repeater number in the system but it may or may not be the frequency you are monitoring.

 

[loumaag]

As pro92b points out, the Pro-92 is great for finding the frequencies for an LTR system, but there is no way I know to determine the LCN from a Pro-92 (I have tried everything I know in the past.) But, since you seem to have Uniden radios, you can determine the LCN using them.

Start out by putting a single active frequency on the system in all slots from 1 to 20. Whichever slot it works in belongs to it. Leave it there and fill in the other 19 with the second most active frequency. Whichever slot it comes up in, belongs to it. Keep going until you have them all done.

One caution, that is if you get two systems mixed in, you will get bad results.

 

[W4KRR]

One caution, that is if you get two systems mixed in, you will get bad results.

You got that right! There are frequencies that appear to be licensed to different systems, (different call signs) but are actually part of one large system. I have even seen systems that, when I look up the frequencies on the FCC web site, don't show up as licensed to anyone. And, I have seen frequencies that are used as part of an LTR system, and the same frequencies are also used in conventional mode by other users in the same area. :?

 

[EricCottrell]

Hello,

Is it possible to tap the 92's low pass slicer like the Pro-2067?
http://www.radioreference.com/modules.php?name=Forums&file=viewtopic&t=10490

It might be tight. I know I had fun tapping some Radio Shack Handheld scanners.

LTRDump would give you more information but needs a low-pass filter data slicer connected to the computer.

73 Eric

 

[INDY72]

Also,.. though its not a good scanner for LCN's on an LTR,.. it is an excellent aid for LCN's on an EDACS system. As for making an 92 into a slicer,.. if you use a 92 B,... it might work great!

 

[pro92b]

The PRO-92 LTR circuit is the same as the PRO-2067. It doesn't matter which version of the PRO-92 you have. The attached file is a scan of the AF PC board, the one in the middle of the three boards. The red squares show the access points for the LTR tap. To activate the MX805 the channel must be set to PL, DPL, LT, or MOT. In the other modes the chip is disabled. The tap should be connected to an ordinary 2 level data slicer which plugs into a computer serial port. As usual I recommend a 10K resistor in the radio for coupling to provide circuit isolation.