E.F. Johnson Company LTR-Net 7243 Manuel de service

TRUNKED PORTABLE RADIOSERVICEMANUALFirst IssueNovember 2001LTR-NET™7243 UHF PORTABLE7.5VDC1 and 4 WattsPart No. 242-7243-xxx

GENERAL INFORMATION1-4November 2001Part No. 001-7240-0011.12 BATTERY CHARGER INFORMATION1.12.1 GENERALThe battery pack for the 7243 portable contains

PARTS LIST7-6November 2001Part No. 001-7240-001R411 CR 1/16W 154JV resistor 022-3909-015R412 CR 1/16W 472JV resistor 022-3909-041R413 CR 1/16W 153JV r

PARTS LIST7-7November 2001Part No. 001-7240-001LOGIC BOARD ASSEMBLYC047 GRM39X7R103K50PT capacitor 022-3909-073C101 GRM39X7R103K50PT capacitor 022-390

PARTS LIST7-8November 2001Part No. 001-7240-001C241 GRM39X7R103K50PT capacitor 022-3909-073C242 GRM39Y5V104Z25PT capacitor 022-3909-074C243 GRM39COG27

PARTS LIST7-9November 2001Part No. 001-7240-001R112 CR 1/16W 394JV resistor 022-3909-038R113 CR 1/16W 124JV resistor 022-3909-011R114 CR 1/16W 273JV r

PARTS LIST7-10November 2001Part No. 001-7240-001* Service PartsR233 CR 1/16W 104JV resistor 022-3909-007R234 CR 1/16W 472JV resistor 022-3909-041R235

PARTS LIST7-11November 2001Part No. 001-7240-001Item No. From Pg 6-12Desig. /LocatorAssembly Description Part No.1 A004* Complete assy’s 20101361 Plas

PARTS LIST7-12November 2001Part No. 001-7240-001EXPLODED VIEW

November 2001Part No. 001-7240-0018-1INTERCONNECT SCHEMATICSECTION 8 SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTSBattery InModulation InBattery InSw Nar

November 2001Part No. 001-7240-0018-2C3017pFC3027pFC30318pFR301100kC3120.01L301C3043pFC30618pFR302100kC3130.01L302C3053pFC3075pFC3083pFC3143pFQ301AT-4

November 2001Part No. 001-7240-0018-318110CCCBBBEEECECBE213CBEBEC1120916RT4011234219201456AntennaJackBECECECBECBCECEB11-23-00RF BOARD TOP VIEWRF BOARD

GENERAL INFORMATION1-5November 2001Part No. 001-7240-0017243 SPECIFICATIONSThe following are general specifications intended for use in testing and se

November 2001Part No. 001-7240-0018-4+_7.5 VDCBATTERY PACKC2320.1BATTSourceL5VD201R220100kD202Q206UMT3904D204R22610kR2271kC24033pFD2053.9VR2242.2kSW B

November 2001Part No. 001-7240-0018-5LOGIC BOARD TOP VIEW LOGIC BOARD BOTTOM VIEW111120316191CCCBBBEEECBECBECBE10-5-0010-5-00J103J104J106130115 161219

November 2001Part No. 001-7240-0018-6D401D402D403D404R411100kR412100kR413100kR414100kD405R40247kR40147kR40447kR40347kL5VL5VR415100kR41647kR409100kL5VS

November 2001Part No. 001-7240-0018-7MicEH1D901D902D304D303D306 D305D308D307D310D309S13S14S15S1S2S3S4S5S6S7S8S9S10 S11S12*0#987FCNSYSGRP123456U5122234

November 2001Part No. 001-7240-0018-8ChargePumpBatU101A,U101BU102A,U102BU142A/B,U143A300-3000 HzBandpass FilterLow-Pass FilterLow-Pass FilterExpanderD

Part Number 001-7240-001NR11-01hph Printed in U.S.A.

2-1November 2001Part No. 001-7240-001OPERATIONSECTION 2 OPERATIONFigure 2-1 Top Panel Controls2.1 FEATURES2.1.1 GENERAL FEATURESThe following feat

OPERATION2-2November 2001Part No. 001-7240-001Figure 2-2 DisplayBUSYGSUIDTxP2CLOMSystemScan ListPhoneGroupGroup ScanListScanCall8-CharacterAlphanume

OPERATION2-3November 2001Part No. 001-7240-001 - Not currently used. L - Indicates that low transmit power is selected (see Section 2.4.8). - Indicat

OPERATION2-4November 2001Part No. 001-7240-001Dial ModeRCL - After recalling a number, scrolls through other numbers programmed in memory.FCN RCL (0-9

OPERATION2-5November 2001Part No. 001-7240-001Dial Mode8 - Dials the “8” digit.FCN SEND - Automatically transmits the number in the display (after the

OPERATION2-6November 2001Part No. 001-7240-0012.3.4 SYSTEM/GROUP DISPLAY MODETwo system/group display modes can be selected. One is a numeric format a

OPERATION2-7November 2001Part No. 001-7240-001NOTE: This password is not preprogrammed and there is no override procedure. Therefore, if it is forgott

OPERATION2-8November 2001Part No. 001-7240-001To manually monitor a conventional channel before transmitting to determine if it is being used by someo

7243LTR-NET™ PORTABLE RADIOSERVICE MANUALUHF, 430-470 MHzPart No. 242-7243-633Copyright© 2001 by the E.F. Johnson CompanyThe E.F. Johnson Company, whi

OPERATION2-9November 2001Part No. 001-7240-001Conventional Group TypesOnly dispatch calls can be programmed with conventional operation. Conventional

OPERATION2-10November 2001Part No. 001-7240-001Milwaukee. Up to sixteen banks can be programmed, and each bank is identified by a unique alpha tag. Ba

OPERATION2-11November 2001Part No. 001-7240-0012.4.5 ENCRYPTIONEncryption is currently not available. 2.4.6 HOME SYSTEM/GROUP SELECTThe Home Select fe

OPERATION2-12November 2001Part No. 001-7240-001Table 2-1 Menu Mode and Option Switch FunctionsFunction Menu Item Option Switch See Description in Se

OPERATION2-13November 2001Part No. 001-7240-001and then programming a default condition in the menu mode programming screen. However, if a parameter c

OPERATION2-14November 2001Part No. 001-7240-001display mode selected, the system number is replaced by dashes and likewise for the group number when g

OPERATION2-15November 2001Part No. 001-7240-0012.6.6 CONVENTIONAL MODE SCANNINGAs with LTR mode scanning, if a conventional system is selected with ro

OPERATION2-16November 2001Part No. 001-7240-001Scan Continue TimerThe scan continue timer controls the maximum time that a call is received before sca

OPERATION2-17November 2001Part No. 001-7240-0011. Access the radio system by briefly pressing the PTT switch. 2. When a dial tone is heard, dial the d

OPERATION2-18November 2001Part No. 001-7240-0012.7.6 RECALLING NUMBERS FROM MEMORYFrom Specific Location - FCN RCL 0-9 (location number)Stored in Next

TABLE OF CONTENTSiiiNovember 2001Part No. 001-7240-001TABLE OF CONTENTS1 GENERAL INFORMATION1.1 SCOPE OF MANUAL. . . . . . . . . . . . . . . . . . . .

OPERATION2-19November 2001Part No. 001-7240-001can be programmed as not interruptible. This has the same affect as programming it with a “1” priority.

OPERATION2-20November 2001Part No. 001-7240-001Mobile Disable, and Reassignment are originated by the system operator or a dispatcher. Special LTR-Net

OPERATION2-21November 2001Part No. 001-7240-0013. If placing a unique ID or directed group call, select the auxiliary group in the normal manner using

OPERATION2-22November 2001Part No. 001-7240-001Landside-Originate Special Calls Calls can be also be made from any landside tele-phone to specific mob

OPERATION2-23November 2001Part No. 001-7240-001mobile’s unique ID and the home repeater to be used. The registration information is forwarded to the C

OPERATION2-24November 2001Part No. 001-7240-001Capture Percentage - This is the percentage that squelch is tightened on the second and later passes wh

OPERATION2-25November 2001Part No. 001-7240-001Repeater Number Programming With AliasingSince the next lower numbered repeater is moni-tored when a sy

OPERATION2-26November 2001Part No. 001-7240-0015. When the other party answers, press the PTT switch and respond. The PTT switch must be pressed to ta

OPERATION2-27November 2001Part No. 001-7240-001with an LTR-Net or LTR system selected, scanning halts and “NOT CONV” is displayed, but monitoring is n

OPERATION2-28November 2001Part No. 001-7240-001option to disable the reverse burst or turn-off code on transmit channels programmed with Call Guard sq

TABLE OF CONTENTS (CONT’D)TABLE OF CONTENTSivNovember 2001Part No. 001-7240-0012.12 SUPERVISORY TONES . . . . . . . . . . . . . . . .2-28General Tone

OPERATION2-29November 2001Part No. 001-7240-001Intercept Tone - This is a siren-like tone (alternating high and low tones) consisting of 700 Hz and 80

OPERATION2-30November 2001Part No. 001-7240-001respond to your transmission. It sounds when you release the PTT switch, and you may partially hear thi

OPERATION2-31November 2001Part No. 001-7240-001TX DSBL - Indicates that the selected group system is programmed for monitoring only (see Section 2.4.1

OPERATION2-32November 2001Part No. 001-7240-001stored and can be read using the programmer (see next section). To return to normal operation, cycle po

3-1November 2001Part No. 001-7240-001PROGRAMMINGFigure 3-1 Programming SetupRemote Programming Interface (RPI)Programming CableP.N. 597-7200-031CAUT

PROGRAMMING3-2November 2001Part No. 001-7240-001injecting the transmit audio signal and monitoring receive audio during alignment (see Section 5). Ear

PROGRAMMING3-3November 2001Part No. 001-7240-0013. Select > Run and then click the Browse button and select the “Setupex.exe” file on the CD. 4.

PROGRAMMING3-4September 2001Part No. 001-7240-001 - Read the programming data from radio (Section 3.7). - Write programming data to a radio (Section 3

PROGRAMMING3-5November 2001Part No. 001-7240-001Figure 3-2 Main WindowTitle Bar -Menu Bar -Status Bar -Toolbar - Status/U208MemoryLeftU150MemoryLeft

PROGRAMMING3-6November 2001Part No. 001-7240-001and exit, or click the Cancel button to exit without saving any changes. 3.4.5 SYSTEM PROGRAMMINGEach

TABLE OF CONTENTS (CONT’D)TABLE OF CONTENTSvNovember 2001Part No. 001-7240-001Limiter (U151A). . . . . . . . . . . . . . . . . . . . . . . . 4-10Low

PROGRAMMING3-7November 2001Part No. 001-7240-0011. Connect the computer to the transceiver as described in Section 3.1.6. 2. Download the data to the

PROGRAMMING3-8November 2001Part No. 001-7240-0013.6.2 EDIT RADIO TYPE SCREENThe Radio Type screen shown below selects the type, tier, frequency band,

PROGRAMMING3-9November 2001Part No. 001-7240-001Call Delay - Selects the time from 0-7 seconds before scanning resumes after transmitting a message (S

PROGRAMMING3-10November 2001Part No. 001-7240-001grammed by the user. Numbers of up to 16 digits can be entered, and entering a “@” produces a 1-secon

PROGRAMMING3-11November 2001Part No. 001-7240-0013.6.9 EDIT SYSTEM SCREENThe Edit > Systems menu parameter (see Figure 3-3) or equivalent buttons i

PROGRAMMING3-12November 2001Part No. 001-7240-001 Read Setup Params - Reads the data contained in a transceiver. This function can be used to check tr

PROGRAMMING3-13April 2001Part No. 001-7240-001View Personality - Enables or disables the left pane in the main part of the screen which displays the c

PROGRAMMING3-14November 2001Part No. 001-7240-001between numbers. For example, a five-repeater system should be numbered 1, 5, 10, 15, and 20. These n

PROGRAMMING3-15September 2001Part No. 001-7240-001Table 3-2 Locality Programming Screen DescriptionThis screen is used to create a new locality or e

PROGRAMMING3-16September 2001Part No. 001-7240-001Parameter DescriptionDisplay ModeSelects if repeater frequencies are entered as programming Channel

TABLE OF CONTENTS (CONT’D)TABLE OF CONTENTSviNovember 2001Part No. 001-7240-001LIST OF TABLES1-1 7243 Portable Accessories . . . . . . . . . . . . .

PROGRAMMING3-17September 2001Part No. 001-7240-001Table 3-4 Group Programming Screen DescriptionThis screen is used to add groups to a system or edi

PROGRAMMING3-18November 2001Part No. 001-7240-001 Conventional Group Programming ScreenParameter DescriptionGroupNumberThis drop-down list selects the

PROGRAMMING3-19November 2001Part No. 001-7240-001Table 3-5 Bank Programming Screen DescriptionThis screen is used to create a new bank or edit a cur

PROGRAMMING3-20September 2001Part No. 001-7240-001Parameter DescriptionDone Button Click this button when finished editing the bank to save the change

4-1November 2001Part No. 001-7240-001CIRCUIT DESCRIPTIONSECTION 4 CIRCUIT DESCRIPTIONNOTE: A block diagram of the RF and logic boards is located on

CIRCUIT DESCRIPTION4-2November 2001Part No. 001-7240-001With the receive VCO, Q501 produces the first injection signal in the range of 385-425 MHz whi

CIRCUIT DESCRIPTION4-3November 2001Part No. 001-7240-001the C5V input voltage. This converter has a built-in relaxation oscillator and rectifier. The

CIRCUIT DESCRIPTION4-4November 2001Part No. 001-7240-001other inputs are unshifted in phase). This network consists of C410 and ceramic discriminator

CIRCUIT DESCRIPTION4-5November 2001Part No. 001-7240-001As forward power increases, the output voltage on pin 7 decreases. U103 then turns off more wh

CIRCUIT DESCRIPTION4-6November 2001Part No. 001-7240-00121 KEYR1 Input Key matrix scan in -22 KEYR2 Input Key matrix scan in -23 KEYR3 Input Key matri

1-1November 2001Part No. 001-7240-001GENERAL INFORMATION1.1 SCOPE OF MANUALThis service manual contains operation, program-ming, alignment, and servic

CIRCUIT DESCRIPTION4-7November 2001Part No. 001-7240-00164 - - External pull-up -65 BEEP Output Audio beep tone -66 - - - -67 - - - -68 - - - -69 - -

CIRCUIT DESCRIPTION4-8November 2001Part No. 001-7240-001107 MICMUTE Output Mutes microphone audio signal Low108 SQUELCH Input Squelch control -109 BWC

CIRCUIT DESCRIPTION4-9November 2001Part No. 001-7240-001Also applied at this point are the DTMF and beep tones. Muting of the DTMF tones is provided b

CIRCUIT DESCRIPTION4-10November 2001Part No. 001-7240-001U143A is selected. The data output signal on U141C, pin 4 is then applied to pin 24 of U147 w

CIRCUIT DESCRIPTION4-11November 2001Part No. 001-7240-001transmit data signal on pin 2 is selected is routed to the filter, and when it is high the re

5-1November 2001Part No. 001-7240-001ALIGNMENT PROCEDURESECTION 5 ALIGNMENT PROCEDUREFigure 5-1 Alignment Setup DiagramCAUTIONMake sure that the p

ALIGNMENT PROCEDURE5-2November 2001Part No. 001-7240-001alignment is complete, the LTR-Net operating soft-ware is reloaded. The procedure is described

ALIGNMENT PROCEDURE5-3November 2001Part No. 001-7240-0011. Connect the test setup and make sure that the switch on the front of the RPI is set to the

ALIGNMENT PROCEDURE5-4November 2001Part No. 001-7240-001Figure 5-2 PCTune Tune Radio ScreenDisplay Tune Parameters - Displays the following screen w

ALIGNMENT PROCEDURE5-5November 2001Part No. 001-7240-001ments that are performed are shown on the eight buttons on the left side. To perform just one

GENERAL INFORMATION1-2November 2001Part No. 001-7240-001transceiver. The cables from the RPI to computer and transceiver are not included with the RPI

ALIGNMENT PROCEDURE5-6November 2001Part No. 001-7240-001connected to the accessory jack. Make sure that the switch on the RPI is away from the LED so

ALIGNMENT PROCEDURE5-7November 2001Part No. 001-7240-0012. Inject a 1 kHz signal at the level indicated on the screen into the Mic Audio jack of the R

ALIGNMENT PROCEDURE5-8November 2001Part No. 001-7240-001PERFORMANCE TESTS5.14 RECEIVER PERFORMANCE TESTS5.14.1 PRELIMINARY SETUPWith the standard LTR-

ALIGNMENT PROCEDURE5-9November 2001Part No. 001-7240-0015.15 TRANSMITTER PERFORMANCE TESTS5.15.1 POWER OUTPUTRefer to Section 5.14.1 for information o

ALIGNMENT PROCEDURE5-10November 2001Part No. 001-7240-0015.16 TEST CODE FUNCTIONS5.16.1 GENERALWhen the special test operating code has been loaded as

ALIGNMENT PROCEDURE5-11November 2001Part No. 001-7240-0015.16.5 PARAMETER EDIT MODESGeneralSome levels set during alignment can be manu-ally controlle

6-1November 2001Part No. 001-7240-001LTR-NET OVERVIEWFigure 6-1 LTR-Net System DiagramDataBusVoice andData LinkViking® VX RepeatersDataBusVoice andD

LTR-NET OVERVIEW6-2November 2001Part No. 001-7240-001• Current LTR subscriber units can remain in service and LTR-Net subscriber units added gradually

LTR-NET OVERVIEW6-3November 2001Part No. 001-7240-001• Typical access time for group calls is the same as with LTR operation. • Priority access, autom

LTR-NET OVERVIEW6-4November 2001Part No. 001-7240-001LTR-Net Subscriber UnitsThese subscriber units are designed for operation in an LTR-Net radio sys

GENERAL INFORMATION1-3November 2001Part No. 001-7240-001repair. Clearly describe the difficulty experienced in the space provided and also note any pr

LTR-NET OVERVIEW6-5November 2001Part No. 001-7240-0016.2.5 CALL PROCESSORThe Call Processor is a Windows NT-based personal computer running switch man

LTR-NET OVERVIEW6-6November 2001Part No. 001-7240-001• The call is routed to a specified locality only if a call on the home/group has been recently d

LTR-NET OVERVIEW6-7November 2001Part No. 001-7240-001voice on any repeater because the data occupies the subaudible frequencies below the voice band.6

LTR-NET OVERVIEW6-8November 2001Part No. 001-7240-001Uses of unique ID codes include registering and de-registering on a locality, unit identification

LTR-NET OVERVIEW6-9November 2001Part No. 001-7240-001When a new locality is located, the subscriber unit registers on the locality by sending messages

7-1November 2001Part No. 001-7240-001PARTS LISTSECTION 7 PARTS LISTRef No Description Part No.COMPLETE ASSEMBLIESA001* Keypad/display board 51300081

PARTS LIST7-2November 2001Part No. 001-7240-001Q402 DTA123EUA switching SC-70 022-3909-226Q403 DTA123EUA switching SC-70 022-3909-226Q404 UMT3904 swit

PARTS LIST7-3November 2001Part No. 001-7240-001C136 ECS-T1CY475 capacitor 022-3909-111C137 GRM39X7R103K50PT capacitor 022-3909-073C138 GRM39COG471J50P

PARTS LIST7-4November 2001Part No. 001-7240-001C506 GRM39COG220J50PT capacitor 022-3909-083C507 GRM39COG070D50PT capacitor 022-3909-067C508 GRM39COG47

PARTS LIST7-5November 2001Part No. 001-7240-001L503 0805CIH21T33NJ chip coil 022-3909-211L504 0805CIH21T15NJ chip coil 022-3909-207L505 0805CIH21T27NJ