LAND MOBILE PRODUCT SECTOR
1301 E. ALGONQUIN RD.
SCHAUMBURG, IL. 60196
PSB # 828
APC # 225,218,360,301
DATE: NOVEMBER, 1997
EXPIRES : N/A
SUBJECT: LOSS OF RANGE AFTER SYSTEM MIGRATION OR FIRMWARE UPGRADE
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.
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.
T0 setting T0 setting
25 kHz BW 12.5 kHz BW
Release Number Channel spacing 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
BAND WIDTH T0 Adjustment
25 kHz BW or 12.5 kHz
Existing Release Number (s) New Release Number(s) Channel Spacing
6.2 7.X, 8.0 MSF, MICOR decrement by 2
6.2 8.1-8.5,9.0-9.3 increment by 4
7.X MSF, MICOR 7.X, 8.0 MSF,MICOR no change
7.X, 8.0 MSF,MICOR 8.1- 8.5, 9.0 9.3 increment by 6
8.1 8.5 8.1 8.5, 9.0 9.3 no change
9.0 9.3 9.0 9.3 no change
_This recommendation is for Quantar/Quantro stations (all RF bands)
_ If stations within a system contain both EPIC and Non-EPIC boards, use release 6.2 as the non epic values to make the appropriate adjustments.
_ Version A and B IRB boards have one 8-bit T0 timer for all four control channels. Therefore, this recommendation will not work in existing systems with version A or B IRB boards and a T0 setting of FA or greater.
_ Systems with version A and B IRB boards have only one T0 timer, therefore all four control channels must be the same model base station (1.e. all MICOR, all MSF, all Quantar/Quantro). In this configuration Quantar/Quantro stations that are control channel capable must contain the same firmware versions within a site.
No reference to warranty is implied or intended.
Labor and parts warranty reference is limited to products sold in the United states. For products sold or in use Internationally this bulletin is for Informational Purposes Only.