3% | Hardware Turing and Troubleshooting 48 PIN MOTHERBOARD INTERFACE CONNECTOR A 48 pin connector is used for interfacing the MT-3 Motherboard to the receiver and transmitter.
Hardware Tuning and Troubleshooting | 37 RECEIVER TROUBLESHOOTING The receiver is composed of 4 main components; the Receiver Main Board, the Synthesizer Module, the RF Prospector, and the Universal Daughter Board (BUD. An optical Decryption Board can be installed in the Receiver. These steps will help you determine the most likely sub-assembly that contains a fault, and may help you determine what that fault is. The sub-assembly or the entire receiver can be sent back to Daniels Service section for repair.
8 | Hardware Tuning and Troubleshooting Receiver Main Board Check the following test points on the receiver Main Board: Test Point Signal Monitored Typical Voltage TP Voltage from motherboard +13.8 VDC line +10 to +17 VDC TPZ Regulated +8.5 VDC from motherboard +85VDC 5% TPS Switched +13.8 VDC line from front panel switch +10 to +17 VDC P37 +6.0 VDC supply +80VDC 5% TP38 8.0 VDC supply £0VDC 25% TP54 +3.3 VDC supply +33VDC 26% TOSS +1.2 VDC supply +12VDC +5 % PSST +1.8 VDC supply TP57 +2.
Hardware Tuning and Troubleshooting | 39 Synthesizer and UDB Modules The Synthesizer module and UDB are bound together through their communication link. At this level of fault diagnosis it is not feasible to isolate the problem between two units.
40 | Hardware Tuning and Troubleshooting TRANSMITTER TROUBLESHOOTING The Transmitter is composed of 4 main components, the Transmitter Main Board, the Synthesizer Module, RF Power Amplifier and Universal Daughter Board (BUD. An optional Encryption Board can also be installed in the Transmitter. These steps will help you determine the most likely sub-assembly that contains a fault, and may help you determine what that fault is.
Hardware Tuning and Troubleshooting | 41 Transmitter Main Board Check the following test points on the Transmitter Main Board: Test Point Signal Monitored Typical voltage TP Voltage from motherboard +13.8 VDC line +10 to +17 VDC TP2 Regulated +9.5 VDC from motherboard TP3 USB connector power +3.0 VOC or +53.0 VDC TP4 Switched +13.8 VDC fine from front panel switch +10 to +17 VOC Test Points are shown on the MT-4 Transmitter Jumper and Test Point Locator Illustrations.
42 | Hardware Tuning and Troubleshooting if the transmitter front panel NORMAL/OFF/ KEY TX switch is set from the OFF position 1o the NORMAL position and the two front panel LED both turn ON for less than 2 seconds and then turn OFF and the RF output power control is set at its maximum in the Power Levels area of the Service section on the RSS, but the RF output power is considerably less than 8 W.
Hardware Tuning and Troubleshooting | 43 SYSTEM TROUBLESHOOTING If the radio system is not receiving or transmitting on the right frequency, check the Channel and Bank select lines of the Receiver and Transmitter modules. The Motherboard has jumpers that allow one of 16 channels to be selected on a receiver or transmitter. The factory default is to have them all set to ground the channel select lines CLOSE-3, forcing the radio to operate on channel 1.
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45 RADIO SYSTEM CONFIGURATIONS REPEATER The MT-4 series Receivers and Transmitters may be configured in a repeater configuration. The standard way of setting up a repeater system Is to connect the receiver to the transmitter through a Radio Interconnect Cable plugged into the RJ45 CLINT BUS connectors on the front panels of each radio module. This cable routes Analog and Digital COR / PTT signals and LIDS Serial Data from the receiver to the transmitter in both Analog and P25 Digital mode.
46 | Repeater System Configuration ANALOG FIXED (BASE) STATION INTERFACE The MT-4 series Receivers and Transmitters may be configured in a fixed (or base) station configuration with an analog interface. An Audio Control Card or Base Controller is added to the system for E & M control, For Tone Remote control of the system, a Tone Remote Adapter is added fo the system along with the Controller.
47 ILLUSTRATIONS PRINTED CIRCUIT BOARD NUMBERING CONVENTION Daniels Electronics Ltd. has adopted a printed circuit board (PCB) numbering convention in which the last two digits of the circuit board number represent the recruit board version. All PCB's manufactured by Daniels Electronics Ltd. are identified by one of the following numbering conventions: PCB number 43-912010 Indicates circuit board version 1.
48 | Frustration MT-4 RECEIVER FRONT VIEW Factory Set Operating Frequency Receiver Model identifier =" MT-4 VHF & UHF Receiver & Transmitter Instruction Manual — | MOB-MT-4E-TXRX
50 | illustrations MT-4 RECEIVER BLOCK DIAGRAM [grass as seen 1524 as i wan ce soo ge, a [rm UNIVERSAL DAUGHTER SES Ze mn BOARD (UDR) 17% sore fie o BAe pr come wo sas enn sme ane {3 con noes: ” correction barometer carotene (GF = acre oom (PF LES [— coax RF INPUT CHISEL =" MT-4 VHF & UHF Receiver & Transmitter instruction Manual LD= I MOB-MT4E-TXRX
52 Must rations MT-4 RECEIVER TOP COMPONENT VIEW (2) +8.
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56 | ministrations MT-4 TRANSMITTER FRONT VIEW Factory Set Operating Frequency Transmitter Model identifier =" MTGE VHF & UHF Receiver & Transmitter Instruction Manual —— |
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60 | Frustration MT-4 TRANSMITTER BOTTOM COMPONENT VIEW RF Output from Synthesizer RF Input to Amplifier Amplifier Connector J1 8 Watt Discrete Amplifier Assembly Universal Daughter Board MT-4 VHF & URF Receiver 8 Transmitter instruction Manual IMO8-MT-4E-TXRX 0="
65 PARTS LISTS MT-4 RECEIVER ELECTRICAL PARTS LIST Part Number Description Product Quantity A11-FEA150 RF PRES ELECTOR CLASS VHF CLASS B 1 A11-FE4A-150 RF PRES ELECTOR CLASS A, 136-174 VHF CLASS A 1 A13-FE4-420 RF PRES ELECTOR CLASS UHF (406-430) CLANS B 1 A13-FE4A-420 RF PRES ELECTOR CLASS A 408-430 UHF (408-430) CLASS A 1 A13-FE4-460 RF PRES ELECTOR CLASS UHF (450-470) CLASS B 1 A13-FE4A-460 RF PRES ELECTOR CLASS A 450-470 UHF (450-470) CLASS A 1 A13-FE4-500 RF PRES ELECTOR CLASS UHF (470-520) CLASS B 1 R
Parts Lists | §7 MT-4 TRANSMITTER ELECTRICAL PARTS LIST Part Number Description Product Quantity AN-DUB UNIVERSAL DAUGHTER BOARD ALL 1 A21-TX4E-MAIN TRANSMITTER MAIN BOARD ASSEMBLY ~~ ALL 1 A21-VPA155-08 TX POWER AMP, VHF 130-180 MHz VHF 1 A23-UPA450-08 TX POWER AMP, UHF 380-512 MHz UHF 1 AB 4-0T4-180 SYNTHESIZER, TX, VHF, 138.
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69 GLOSSARY OF TERMS AMBE+2™ CIVICS Abbreviation for ‘Advanced Multi Band Abbreviation for “Continuous Tenn-Controlied Excitation”, Squelch System”. Bandwidth nes The difference between the limiting Abbreviation for “Digital Coded Squelch”. frequencies of a continuous frequency band. Typically measured in kilohertz. May be DSP considered the amount in kilohertz required Abbreviation for “Digital Signal Processor” a for a single communications channel. specialized microcomputer.
o= Glossary of Terms. L188 Abbreviation for “Least Significant BIT" MSB Abbreviation for “Mast Significant BIT" NAC Abbreviation for “Network Access Code." A twelve bit field identifying the network of the radio message. Typically used to steer repeater functions. DE PTT Abbreviation for *Push-to-Talk", the switch on a subscriber unit which, when pressed, causes the subscriber unit to transmit, BR SKIP Abbreviation for "Quadrature Phase Shift Keying” modulation technique. PSK using four phase states.
7 REVISION HISTORY Revision Date €o Description 1-0-0 Dec 08 > + Product Release “CO's 6219; 6250, 6236; and 6256 1-0-1 Jan 07. oo « Formatting updates. IM Content remains the same.
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