COMMERCIAL GOVERNMENT & INDUSTRIAL SOLUTIONS SECTOR
1301 E. ALGONQUIN RD. 
SCHAUMBURG, IL. 60196 
(847) 576-0180 

DATE : MARCH, 1999
PSB # 828-B (Supercedes PSB #828A)
APC # 218, 225, 301, 360


EXPIRES : N/A

SUBJECT: LOSS OF RANGE AFTER SYSTEM MIGRATION OR FIRMWARE UPGRADE

PSB 828-A CHANGES FROM THE ORIGINAL PSB 828: UPDATED TO INCORPORATE THE LATEST SOFTWARE RELEASES SINCE THE ORIGINAL PSB 828 WAS ISSUED.

PSB 828-B CHANGES FROM THE ORIGINAL PSB 828 AND 828-A UPDATED TO CHANGE TABLE # 1 FOR 12.5 kHz BW CHANNEL SPACING FOR RELEASE 9.6 OR LATER. CORRECT SETTING IS F8 VERSUS FE

MODELS AFFECTED : ALL NON INTELLEREPEATERS, NON SIMULCAST QUANTAR/QUANTRO

SYSTEMS AFFECTED : TRUNKING NON-SIMULCAST USING TRUNKED RADIO SYSTEM CENTRAL CONTROLLER OR STARTSITE CONTROLLER

SYMPTOM: After migrating to Quantar/Quantro stations or upgrading the station firmware some customers have experienced a loss of range in their system. It has been discovered that certain Quantar firmware releases have additional throughput delay on the control channel. This added delay results in a reduction and/or change in the ISW decode range of the Quantar/Quantro station.

RESOLUTION:
The recommended changes to the IRB T0 setting shown in table 1 will compensate for any changes in delays in the Quantar stations when upgrading to a newer release. Using the recommended T0 setting will allow subscriber radios to talk back a maximum distance that is comparable with the MSF5000 which is used as the benchmark. If less coverage is desired, then decrement the T0 counter by 1 until the desired coverage from the site is reached. 
Use this procedure as described above only if the existing IRB T0 setting is the factory default of F6. If the existing IRB T0 setting is not F6, it is recommended that the T0 counter be adjusted by the amount shown in Table 2. If the desired range is not achieved, then adjust the T0 counter up or down by 1 until the range desired is reached.
Consult the Trunked radio system controller manual or Startsite Controller manuals for assistance in adjusting the T0 counter.

Table 1:

Release Number

T0 setting
25 kHz BW 
Channel spacing  
T0 setting  
12.5 kHz BW  
channel spacing
6.2 F8 FA

7.0

F6   F8
7.1 F6   F8
7.2 F6   F8
7.3 F6   F8
8.0 F6   F8
MSF  F6   F8
MICOR  F6   F8
8.1 FC   FE
8.2  FC   FE
8.3 FC   FE
8.4  FC   FE
8.5  FC   FE
9.0  FC   FE
9.1   FC   FE
9.2 FC   FE
9.3 FC   FE
9.4 FC   FE
9.5    FC   FE
9.6 and later  F6   F8

 

Table 2:
BAND WIDTH
Existing Release Number (s)  New Release Number(s) T0 Adjustment
25 kHz BW or 12.5 kHz  Channel Spacing
6.2  7.X, 8.0 , MSF, MICOR, 9.6 and later  decrement by 2
6.2   8.1-8.5,9.0-9.5 increment by 4
7.X MSF, MICOR  7.X, 8.0, 9.6 and later, MSF,MICOR no change
7.X, 8.0 MSF,MICOR  8.1- 8.5, 9.0 9.5  increment by 6
8.1 8.5 8.1 8.5, 9.0 9.5  no change
8.1 - 8.5 9.6 and later decrement by 6
9.0 9.5  9.0 9.5  no change
9.0 - 9.5  9.6 and later  decrement by 6


NOTE: 

No reference to warranty is implied or intended. 

The following five diagrams show how to set the T0 jumpers on IRB version B (TRN8662B).


NOTE: Version A (TRN8662A) does not have jumpers, but the connections are identical. The solder pads are hardwired on the back of the card.
      

   

   

 

The following diagrams show the T0 DIP switch setting for the IRB version C board (TRN8662C).