Need Custom Trunking Table Information

[W2GLD]

I need to know how to program the following custom trunking table for a project we are working on. Tables 01 & 02 are provided by default; however table 03 & 04 are not. Any help would be greatly appreciated for the missing information.

Table 01:
Channel Lo=0
Channel Hi=4095
Offset=0
Base=851.00625
Step=6.25

Table 02:
Lo Chan=4096
Hi Chan=8191
Offset=4096
Base=762.00625
Step=6.25

Table 03:
Lo Chan=
Hi Chan=
Offset=
Base=851.01250
Step=12.5

Table 04:
Lo Chan=
Hi Chan=
Offset=
Base=762.00625
Step=12.5

I need to know the channel Lo & Hi setting as well as the offset for table 03 & 04.

Thanks,

Jerry

 

[ka3jjz]

It would be helpful to know what system this is for...best regards..Mike

 

[W2GLD]

It would be helpful to know what system this is for...best regards..Mike

Mike, this isn't particular to one system; these tables will eventually apply to ALL X2-TDMA Project-25 Phase II systems since they are compatible with both FDMA & TDMA radios in a hybrid setup. This will be the case in New Jersey for the State Police system as well as the Michigan MPSCS system, Camden Counties new TRS system and so-forth.

As it stands now, the default in most scanners only accounts for the first two tables in a standard Project-25 Phase I setup. I have not been able to find the equation that is used to calculate these tables according to what the GRE scanners require. At some point, someone had to design what the first two table were so I was hoping that someone from GRE would be of assistance with this.

 

[W2GLD]

After a little more in-depth searching, I uncovered this document that might help explain this issue a little better.

Page(s) 24 through 26

http://www.pa2600.com/pro96com.pdf

I'll test it out and see but I am still open to suggestions.

Thanks,

Jerry

 

[mikewazowski]

Most P25 systems broadcast the appropriate tables over the control channel.

You should be able to use a suitable control channel decoding program to pull that information for you.

However, don't assume each system will use the same tables.

Those predefined tables are from the manufacturer and will be over written if the control channel broadcasts anything different.

You might also be able to pull the tables by leaving your scanner parked on the control channel.

A local P25 UHF system will autopopulate the tables on my Uniden scanners. I suspect your system will do the same.

 

[W2GLD]

Most P25 systems broadcast the appropriate tables over the control channel.

You should be able to use a suitable control channel decoding program to pull that information for you.

However, don't assume each system will use the same tables.

Those predefined tables are from the manufacturer and will be over written if the control channel broadcasts anything different.

You might also be able to pull the tables by leaving your scanner parked on the control channel.

A local P25 UHF system will autopopulate the tables on my Uniden scanners. I suspect your system will do the same.

Agreed that this has always been the case in the past with both Uniden & GRE scanners; however, with the addition of hybrid FDMA/TDMA Project-25 Phase I & Phase II, it creates additional challenges. In the future, I suspect that scanner manufactures will end up correcting these challenges but it's way too early in the game to even expect that change to occur or even ask for it in firmware.

I am experimenting with a few of these hybrid systems and these additional parameters are required for proper operation.

 

[W2GLD]

As of today (08-01-2011) 11:40 hours, I have confirmed the following custom tables to work with the Project-25 Phase II Hybrid systems.

Table 01:
Channel Lo=0
Channel Hi=4095
Offset=0
Base=851.00625
Step=6.25

Table 02:
Lo Chan=4096
Hi Chan=8191
Offset=4096
Base=762.00625
Step=6.25

Table 03:
Lo Chan=12288
Hi Chan=16383
Offset=12288
Base=851.01250
Step=12.5

Table 04:
Lo Chan=16384
Hi Chan=20479
Offset=16384
Base=762.00625
Step=12.5

I have tested these on a PSR-500, PSR-600, & PSR-800 and they are tracking a few systems perfectly...

Thank you all for your posts.

 

[OsloViking1975]

Now in the future will there be scanners that already have the custom band plans put in them without you having to program them? That would be a nice option where you just select a custom band plan and it is already in there.

Thats great you got that all figured out. It must of took some time.

 

[W2GLD]

Now in the future will there be scanners that already have the custom band plans put in them without you having to program them? That would be a nice option where you just select a custom band plan and it is already in there.

Thats great you got that all figured out. It must of took some time.

It took a little bit of messing around and trial and error; but worth it in the end. Sometimes it just helps to put your thoughts out there and it turn to spark new ones.

I believe that scanners in the future will already come setup for the standardized systems; however, there will always be those agencies who must be different and those will still mandate a custom programming schema.

Thanks,

 

[mikey60]

As of today (08-01-2011) 11:40 hours, I have confirmed the following custom tables to work with the Project-25 Phase II Hybrid systems.

Table 01:
Channel Lo=0
Channel Hi=4095
Offset=0
Base=851.00625
Step=6.25

Table 02:
Lo Chan=4096
Hi Chan=8191
Offset=4096
Base=762.00625
Step=6.25

Table 03:
Lo Chan=12288
Hi Chan=16383
Offset=12288
Base=851.01250
Step=12.5

Table 04:
Lo Chan=16384
Hi Chan=20479
Offset=16384
Base=762.00625
Step=12.5

I have tested these on a PSR-500, PSR-600, & PSR-800 and they are tracking a few systems perfectly...

Thank you all for your posts.

To be honest, it does no good to enter the last two tables unless the radio can do TDMA anyway. With those tables entered, the radio will attempt to tune to a frequency it can't decode. It's better to not enter them and let the scanner ignore the voice grants.

Now on the PSR-800, from what I've seen in Pro96Com data, you should see these tables on a P25 X2 system:

Table 00:
Channel Lo=0
Channel Hi=4095
Offset=0
Base=851.00625
Step=6.25
Slots=1

Table 01:
Lo Chan=4096
Hi Chan=8191
Offset=4096
Base=762.00625
Step=6.25
Slots=1

Table 02:
Lo Chan=8192
Hi Chan=12287
Offset=8192
Base=851.01250
Step=12.5
Slots=2

Table 03:
Lo Chan=12288
Hi Chan=16383
Offset=12288
Base=762.00625
Step=12.5
Slots=2

Mike

 

[fmon]

I need to know how to program the following custom trunking table for a project we are working on. Tables 01 & 02 are provided by default; however table 03 & 04 are not. Any help would be greatly appreciated for the missing information.

Table 01:
Channel Lo=0
Channel Hi=4095
Offset=0
Base=851.00625
Step=6.25

Table 02:
Lo Chan=4096
Hi Chan=8191
Offset=4096
Base=762.00625
Step=6.25

Table 03:
Lo Chan=8192
Hi Chan=12287
Offset=8192
Base=851.01250
Step=12.5

Table 04:
Lo Chan=12288
Hi Chan=16383
Offset=12288
Base=762.00625
Step=12.5

I need to know the channel Lo & Hi setting as well as the offset for table 03 & 04.

Thanks,

Jerry

Each new lo setting is previous hi + 1. New hi is lo + 4095. Offset is always equal to lo.

 

[Dewey]

Just as an FYI, I plugged these in to my 396XT, and it did not give me any TDMA advantage. The FDMA appears to still work the same as when it was automagically set.

Dewey

 

[W2GLD]

Just as an FYI, I plugged these in to my 396XT, and it did not give me any TDMA advantage. The FDMA appears to still work the same as when it was automagically set.

Dewey

This post wasn't designed to allow any scanners the ability to monitor TDMA; I was simply searching for this information. You will never hear X2-TDMA with the BCD396/996XT series radios. Now that Home Patrol is here, support is likely gone for all other radios, this has been the norm for Uniden as is why I will never again purchase one!

 

[RoninJoliet]

I believe "Upman" stated that even after the "update-upgrade" the HP-1 will not do Phase11 TDMA because it or any scanner needs new "hardware"....So this is most likely NOT the final product to do the new digital....