Motorola Trunkin I

[lake-hamilton]

Trying to figure out trunking. The system is a mot type II with mot type I users.
The tgid's change when they are on a conversation, in the range of 62000-64000 so its MOT I.
Theres no fleetmap for the system so i experamented a little. Its in block 7 and put in a S4
to see what happened. It works but still curious on if its right. The talkgroups stay on
700-10. Then i heard one user to tell the other to switch to ch C. When they started talking it was still on 700-10. Not sure if this is normal. Any ideas?

 

[Jay911]

I found a spreadsheet some time ago that is pretty ingenious .. it lets you put in as many Type II IDs as you want and it will show you all the possible Type I conversions of that number. That way you can put in all the Type II IDs you have for that agency and see at a glance which Type I IDs work and which don't.

It is originally written for Excel but works just fine in OpenOffice too. Let me know if you want it and if so which version (Excel or OOo) and I'll zip it up and post it here.

 

[ewgoodson]

I am a old (senior citizen) and trying to figure out trunk tracking.. I have tryed to progam my BCT8 and have not had very much success. (in fact none) can some one give me instructions that even I can follow

 

[slicerwizard]

Its in block 7 and put in a S4 to see what happened. It works but still curious on if its right. The talkgroups stay on 700-10.

The fact that the ID doesn't change means that you picked a size code that either allocates the right number of bits for the group ID, or not enough bits.

Then i heard one user to tell the other to switch to ch C. When they started talking it was still on 700-10. Not sure if this is normal. Any ideas?

That tells us that you picked a size code that doesn't allocate enough bits to the group ID (e.g. when the group changed, your display didn't, because the scanner wasn't treating some bits as group bits when it should've)

You used size code S4, which allocates a whopping 9 bits for the radio ID's. You need to use a size code that reduces that number. Your choices are:

S1: 4 bits for radio ID's

S5, S6: 5 bits for radio ID's

S2, S7: 6 bits for radio ID's

S3, S8: 7 bits for radio ID's

S9, S10, S11: 8 bits for radio ID's


Start with S1 and see if a single conversation shows up as multiple ID's; if it does, you need to try S5. If that doesn't work, go with S2, S3, S9 until you find the first one that works.

 

[nosoup4u]

I have a copy of that spreadsheet on my site:

http://wc2em.net:8080/scanner/fleetmap.xls