Product Support Bulletin 787

LAND MOBILE PRODUCT SECTOR PSB # 787 1301 E. ALGONQUIN ROAD APC # 225, 448, 482, 509 SCHAUMBURG, ILL. 60196 Date: OCTOBER, 1996 (847) 576-0180 EXPIRES : N/A Subject: DROPPED TYPE 1 CALLS DUE TO CONFIG OF TX IDLE FREQUENCY NOT EQUAL TO REPEAT FREQUENCY MODELS AFFECTED: 6809 TRUNKED OR INTELLIREPEATER QUANTAR/ QUANTRO BASE STATIONS REFERENCE NUMBERS: DDTS# TRKrs03006; FRB # 287 . ISSUE : DROPPED TYPE 1 CALLS. Intermittent dropped calls are experienced in a type 1 system when the Tx idle frequency is programmed to be not equal to the repeaters active transmit frequency. A similar symptom may be encountered with type II or hybird systems. The problem is due to an unavoidable delay when changing frequencies when keying up. WORK AROUND : SAME AS SOLUTION, MAKE TX IDLE = TX ACTIVE FREQUENCY Do not programm the Tx idle frequency to a value different than the active Tx frequency in trunked systems. SOLUTION : THE R9.0 RSS WILL CONTAIN THE FOLLOWING HELP TEXT NOTE: The actual channel keyup time (i.e., time for the station to switch from the Idle frequency to the channel transmit frequency), will be directly proportional to the frequency difference between the Tx Frequency and the Tx Idle Frequency. Certain applications (Trunking) require minimal delay between switching between these states. In Trunking configurations, make the Tx Idle frequency the same as the Tx Frequency . This is an Informational Bulletin Only. No reference to warranty is implied or intended.