Ericsson LBI-38848D manual

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Table of contents for the manual

  • Page 1

    Maintenance Manual LBI- 38848D DUAL FORMAT MDX  806 - 870 MHz MOBILE RADIO TABLE OF CONTENTS RF BOARD . . . . . . . . . . . . . . . . . LBI-3884 9 SYSTEM BOAR D . . . . . . . . . . . . . LBI-38842 AUDIO/LOGIC BOARD . . . . . . . . . . LBI-38843 AUDIO AMPLIFI ER BOARD . . . . . . . LBI-38844 FRONT CAP ASSEMBLY . . . . . . . . . LBI-38 850 LB I-38[...]

  • Page 2

    Copyrigh t© Decem be r 19 92 , Ericsso n GE Mobile Comm un icat ion s Inc. T ABLE OF CONTENT S Page SPE CI FIC A TION S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 GEN ERA L DESC RIPTI ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 R F B O ARD[...]

  • Page 3

    GENERAL DESCRIPTION The D u al Fo rm at M DX  Mobile R adio is a s ynthe size d, wideba nd ra dio t hat use s int e grate d circ uits and micro com- puter tec hnology to pro v id e hig h pe rforma nce trunk ed oper a- tio n. Thi s radio operates in the Enhanced Di gital Access Communications System (ED A CS ® ), GE-MARC trunking en- vironments [...]

  • Page 4

    AUDIO/LOGIC BOARD The Audio/ Logi c Board pr ovi des all audio and digi tal processing of the receive and transmit audio fo r digital proc essin g by the Log ic Board . The board a lso c ontain s audio filtering, con v entional analog tone processing, and the receiver squ elch. The Aud io/L ogic Bo ard co ntrols the ope ra- tion of the radio and di[...]

  • Page 5

    HARDWARE AND HARDWARE OPTIONS The loc ation and pla cement of system har dware op tions are sh o wn o n Sheet 4 of th e 800 MHz Du al Format MD X Mobile Interconnect Diagrams. OPTION CABLE Option Cable Option PMCD7Z (19C851585P14) is used to bring all option con nections from the System Bo ard through th e back of the radio to the outside. This cab[...]

  • Page 6

    tone in order for the radio to enter the Ready mode. If no busy tone is present or if th e four-tone sequence isn’ t valid, the mobile will jump to the next channel in the call originate se t and ch eck fo r b usy tone as desc ribed a bov e. Ready Mode Whe n an inco ming call has been detec ted or an i dle ch an- nel has been acquired, the mobile[...]

  • Page 7

    In a two-tone call, the mobile sends the collec ted tone for a prog rammab le duration . In the four -t one call, th e mo- bile always se nds a 90-millisecond collect tone which the repe ater re gene rates an d sends fo r the corre ct duration . Group/Individual T ones Group/In di vidu al T ones chose n from the 34 standa rd frequencies follo w the[...]

  • Page 8

    ASSEMBLY DIAGRAM (19D904183, Sh. 1, Rev. 17) LBI-38 848D 7[...]

  • Page 9

    ASSEMBLY DIAGRAM (19D904183, Sh. 2, R ev. 17) (19D904183, Sh. 5, Rev. 17) LBI-38848D 8[...]

  • Page 10

    INTERCONNECTI ON DIAG RAM (19D904133, Sh. 1, R ev. 3) LBI-38 848D 9[...]

  • Page 11

    INTERCONNECTION DIAGRAM (19D904133, Sh. 2, Rev. 2) LBI-38848D 10[...]

  • Page 12

    INTERCONNECTI ON DIAG RAM (19D904133, Sh. 3, R ev. 2) LBI-38 848D 11[...]