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Old 11-24-2008, 2:13 PM
qlajlu's Avatar
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Exclamation Custom Band Plan(s) for Rebanded Systems

These are two widely accepted Custom Band Plans (Trunking Tables) that work with rebanded Motorola Type II SmartZone Trunking systems. A Custom Band Plan is needed in your GRE PSR-500/600 to be able to follow the rebanded sites as well as those yet to be switched.

This chart might be a little easier to read and follow, but must be entered into your programming software manually. For WIN500 users, open the WIN500 program > select the TSYS Objects tab > click on the Trunking Tables bar > enter the table exactly as shown > click Okay. Now click on the Trunking Tables drop down menu and select Custom. Upload to scanner and save to your *.p500 file.
Code:
Lo Chan Hi Chan   Offset    Base Freq     Step
0       439       0         851.012500    25.000
440     559       440       851.025000    25.000
560     719       560       865.012500    25.000
720     759       720       866.000000    25.000
815     831       815       867.000000    25.000
958     958       958       868.975000    25.000
961     1022      961       867.425000    25.000
There's a slightly smaller version, one that merely moves the "rebanded" channels in front of the default 800 MHz table and is included in the current version of the WIN500 software. Open the WIN500 program, select TSYS Objects tab > click on the Trunking Tables bar > click the drop down menu in the new window > select "800 MHz Rebanded" > click Okay. Now click on the Trunking Tables drop down menu and select Custom. Upload to scanner and save to your *.p500 file.
Code:
Lo Chan Hi Chan   Offset    Base Freq     Step
440     559       440       851.025000    25.000
0       719       0         851.012500    25.000
720     759       720       866.000000    25.000
815     831       815       867.000000    25.000
958     958       958       868.975000    25.000
961     1022      961       867.425000    25.000
(This version is also the one that should be used on a PRO-96/2096, since that scanner only has 6 table entries available.)

As far as the PSR-500/600 (and PRO-96/2096) are concerned, the 6-entry version is functionally equivalent to the 7-entry version. The 7-entry version may be necessary for apps like UniTrunker, though. If you experience a hiccup with one Band Plan, try the other one.

Converting LCN (Logical Channel Number) to frequency

For an example let’s say the Control Channel sends voice traffic to channel 445.

Looking at the Band Plan(s) we know that channel 445 falls in between the low channel of 440 and the high channel of 559. So that points us to use the line of the table that covers that group of channels. We then use the following formula to compute the requested frequency:
1. Channel Number minus the offset (445 – 440 = 5).

2. The result of that is multiplied by the step. In our case 25 kHz or .025 MHz (5 x .025 = .125).

3. The result of that is added to the base frequency (851.025000 + .125 = 851.150000).
So we know that channel 445 using either table is 851.150000

The scanners that are not capable of rebanding will not work on some LCN channels between 440 & 559.

The frequencies that will not work are the ones that start with 851, 852 or 853 and contain a 0 as the fourth decimal place.

851.***0 will not work but 851.***5 will work.
852.***0 will not work but 852.***5 will work.
853.***0 will not work but 853.***5 will work.

(I am using * as a wild card.)

We have found that older, non-rebandable Trunk Tracking scanners will retain limited usage. If the Control Channel routes a call to a frequency that begins with 851, 852, or 853, and has a "0" in the fourth decimal place, that call will not be heard by the scanners that cannot be upgraded (flashed).

EDIT TO ADD: Information I have in this post was supplied by gadgetmikey and DonS in other forums or in personal e-mail. It is information given in answers to questions I have had and/or posts I have made. I'm not smart enough to come up with all of this on my own.
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Last edited by qlajlu; 11-25-2008 at 12:28 AM..
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Old 11-24-2008, 4:27 PM
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Location: Holladay,Utah
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Quote:
Originally Posted by qlajlu View Post
These are two widely accepted Custom Band Plans (Trunking Tables) that work with rebanded Motorola Type II SmartZone Trunking systems. A Custom Band Plan is needed in your GRE 500/600 to be able to follow the rebanded sites as well as those yet to be switched.

This chart might be a little easier to read and follow, but must be programmed into your programming software manually.
Code:
Lo Chan Hi Chan   Offset    Base Freq     Step
0       439       0         851.012500    25.000
440     559       440       851.025000    25.000
560     719       560       865.012500    25.000
720     759       720       866.000000    25.000
815     831       815       867.000000    25.000
958     958       958       868.975000    25.000
961     1022      961       867.425000    25.000
There's a slightly smaller version, one that merely moves the "rebanded" channels in front of the default 800 MHz table and is included in the current version of the WIN500 software. Open the WIN500 program, select TSYS Objects tab > click on Trunking Tables bar > click drop down menu > select "800 MHz Rebanded" > Okay.
Code:
Lo Chan Hi Chan   Offset    Base Freq     Step
440     559       440       851.025000    25.000
0       719       0         851.012500    25.000
720     759       720       866.000000    25.000
815     831       815       867.000000    25.000
958     958       958       868.975000    25.000
961     1022      961       867.425000    25.000
(This version is also the one that should be used on a PRO-96/2096, since that scanner only has 6 table entries available.)

As far as the PSR-500/600 (and PRO-96/2096) are concerned, the 6-entry version is functionally equivalent to the 7-entry version. The 7-entry version may be necessary for apps like UniTrunker, though. If you experience a hiccup with one Band Plan, try the other one.

Converting LCN to frequency

For an example letís say the control channel sends voice traffic to channel 445.

Looking at the Band Plan(s) we know that channel 445 falls in between the low channel of 440 and the high channel of 559. So that points us to use the line of the table that covers that group of channels. We then use the following formula to compute the requested frequency:
1. Channel Number minus the offset (445 Ė 440 = 5).

2. The result of that is multiplied by the step. In our case 25 kHz or .025 MHz (5 x .025 = .125).

3. The result of that is added to the base frequency (851.025000 + .125 = 851.150000).
So we know that channel 445 using either table is 851.150000

The scanners that are not capable of rebanding will not work on some LCN channels between 440 & 559.

The frequencies that will not work are the ones that start with 851, 852 or 853 and contain a 0 as the fourth decimal place.

851.***0 will not work but 851.***5 will work.
852.***0 will not work but 852.***5 will work.
853.***0 will not work but 853.***5 will work.

(I am using * as a wild card.)

We have found that older, non-rebandable scanners will retain limited usage. If the Control Channel routes a call to a frequency that begins with 851, 852, 853, and has a "0" in the forth decimal place, that call will not be heard by the scanners that cannot be upgraded.
So Let me get this straight from what you are saying the freq. with a "0" in the fourth position after the decimal will not work So there is only Two Freq in the top table and one in the lower table that will work is that correct? Why do we need the rest?
  #3 (permalink)  
Old 11-24-2008, 4:59 PM
qlajlu's Avatar
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Quote:
Originally Posted by camelcacher View Post
So Let me get this straight from what you are saying the freq. with a "0" in the fourth position after the decimal will not work So there is only Two Freq in the top table and one in the lower table that will work is that correct? Why do we need the rest?
Read the post carefully. The tables are used in a mathematical formula. The Control Channel uses LCNs to assign a frequency. Trunk Tracking scanners capture the LCN in the Control Channel's data stream and uses the Trunking Tables to determine what the frequency will be based on the LCN assigned by the Control Channel. It is the LCN (Logical Channel Number) that tells the radios on the trunked system which frequency they will use to transmit and receive voice traffic. That is why the LCN is an important integral part of our being able to scan.

Trunking Tables exist in all Trunk Tracking scanners. The Custom Band Plan replaces the tables that were in use prior to rebanding. Those frequencies you see stated in the tables are base frequencies only; a starting point in the math used to determine frequency, not necessarily the frequencies the scanners use.
__________________
If you can read this, thank a teacher - If you are reading it in English, thank a veteran.

Drive no faster than your guardian angel can fly.

Time has a way to corrupt everything.

Last edited by qlajlu; 11-24-2008 at 6:09 PM..
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Old 11-24-2008, 5:28 PM
bchris's Avatar
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Join Date: May 2008
Location: Salem, Utah
Posts: 213
Thumbs up Nice Job

Qlajlu & N7YUO

I just wanted you guys to know that I think you both have been doing a wonderful job dealing with this and other subjects recently. I wish I had the time and knowledge to contribute like you guys (and many others) do.

-bc
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