TABLE OF CONTENTS SECTION I GENERAL INFORMATION 1.1 1.2 1.3 1.4 1.5 1.6 INTRODUCTION .......................................................................................................................... 1-1 DESCRIPTION ............................................................................................................................. 1-1 TECHNICAL CHARACTERISTICS .............................................................................................. 1-2 ACCESSORIES.....................
Table of Contents 2.2.4 2.3 2.3.1 2.3.2 2.4 2.5 2.6 DMH Series VHF Radio 2.2.3.7 TRANSMIT FREQUENCY ................................................................................... 2-15 2.2.3.8 TRANSMIT MODE............................................................................................... 2-15 2.2.3.9 TRANSMIT ANALOG CHANNEL GUARD .......................................................... 2-15 2.2.3.10 TRANSMIT NAC ..........................................................................
DMH Series VHF Radio Table of Contents 3.11 SCAN OPERATION.................................................................................................................... 3-12 3.11.1 RECEIVE.............................................................................................................................. 3-12 3.11.1.1 BASIC SCAN ....................................................................................................... 3-13 3.11.2 SCAN CHANNEL GUARD CHANNELS ....................
Table of Contents 4.3 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.6 DMH Series VHF Radio THEORY OF OPERATION........................................................................................................... 4-2 SYSTEM BOARD................................................................................................................... 4-2 RX/TX BOARD....................................................................................................................... 4-3 HIGH LEVEL PA BOARD.............
DMH Series VHF Radio Table of Contents SECTION VI ILLUSTRATED PARTS LIST 6.1 6.2 6.3 INTRODUCTION .......................................................................................................................... 6-1 PARTS LIST DESCRIPTION ....................................................................................................... 6-1 ASSEMBLY DRAWING SYMBOLS.............................................................................................. 6-1 FINAL ASSEMBLY ..............
SECTION I GENERAL INFORMATION 1.1 INTRODUCTION This manual contains information about the physical, mechanical, and electrical characteristics of the BK Radio DMH APCO Project 25 digital radios. 1.2 DESCRIPTION The DMH APCO Project 25 digital radios are self-contained VHF FM Radios covering the frequency range of 136MHz to 174MHz. The radios are multi-channel and digitally synthesized using a single crystal for frequency control.
General Information 1.3 DMH Series VHF Radio TECHNICAL CHARACTERISTICS FREQUENCY RANGE 136-174 MHz CHANNELS: 400 (25 groups of 16 channels) OPERATING VOLTAGE 13.
DMH Series VHF Radio General Information TRANSMITTER 25 / 30 kHz 12.5 / 15 kHz RF OUTPUT POWER: 15 to 50 Watts 15 to 50 Watts OPERATING FREQUENCY SPREAD: 38 MHz 38 MHz SPURIOUS AND HARMONICS: 80 dB 80 dB MODULATION DEVIATION: 5 kHz 2.5 kHz FM HUM AND NOISE: 50 dB 45 dB FREQUENCY STABILITY: ±2.5 PPM ±2.5 PPM AUDIO DISTORTION: 3% 3% AUDIO RESPONSE (per EIA): +1 dB / -3 dB +1 dB / -3 dB MODULATION CHARACTERISTICS: 16K0F3E 11K0F3E 8K10F1E 8K10F1D 25 / 30 kHz 12.
SECTION II INSTALLATION AND PROGRAMMING 2.1 GENERAL INFORMATION This section contains information concerning the installation and programming of the BK Radio DMH APCO Project 25 digital radios. 2.1.1 UNPACKING AND INSPECTING EQUIPMENT Exercise extreme care when unpacking the equipment. Make a visual inspection of the unit for evidence of damage incurred during shipment. If a claim for damage is to be made, save the shipping container to substantiate the claim.
Installation and Programming DMH Series VHF Radio 8. Mount the microphone hanger clip securely to the desired location. The microphone hanger clip must be grounded for proper radio operation. Use the supplied ground wire if needed. 9. Mount any approved accessory speakers and route the wires to the rear of the radio bracket. 10. Connect the power lead, antenna connector, and accessory wires to the rear of the radio. 11.
DMH Series VHF Radio Installation and Programming Figure 2-1 Installation – Dash Mount BK RADIO Page 2-3
Installation and Programming 2.2 DMH Series VHF Radio PROGRAMMING There are three different ways to program BK Radio radios: 2.2.1 • BY PROGRAMMING MICROPHONE A radio can be programmed with the optional LAA 290 programming microphone. That procedure is described in this section. • BY CLONING You can transfer the programmed settings to another radio of the same frequency band by using a cloning cable. See "Cloning Radio Settings" in section 2.3 of this manual.
DMH Series VHF Radio 2.2.2 Installation and Programming GENERAL SETTINGS (CHANNEL 0) Channel 0 settings for each group must be programmed separately. NOTE: Settings listed as Group One Functions, Group Two Functions, and Group Three Functions refer to programming function groups, not channel groups. Press the [FCN] key repeatedly to view the settings in Channel 0 and then loop back to the CH 00 entry point.
Installation and Programming 2.2.2.1 GROUP PASSWORD PRG CH DMH Series VHF Radio 00 1. After entering Programming Mode the display will show ‘PRG CH 00.’ 2. Press the [FCN] key. PRG P123456 3. The display will indicate the password for the selected group. 4a. If no change is needed for the group password, press the [FCN] key to advance to the next field. 4b. To enter a new password, press the [CLR] key, then enter a new sixdigit password.
DMH Series VHF Radio 2.2.2.4 PRG Installation and Programming SCAN DELAY TIME SCN 2.0 sec After the Time-Out Timer is set, the upper display will indicate ‘PRG SCN.’ This is the Scan Delay time in seconds. Press the [FCN] key to advance to the next field if no change is needed. 1. Press the [PRI] key to increase the scan delay time by .5 seconds, up to 7.5 seconds. Press the [PRI] key again to change the time from 7.5 seconds to 0. 2. Press the [CLR] key to reset the scan delay time to 0. 3.
Installation and Programming 2.2.2.6.1 DMH Series VHF Radio OLD-STYLE BK PRIORITY SCAN The radio can be programmed to mimic the Old-Style BK Priority Scan Modes as follows: Mode PR1 TX on PR1 PR2 A On No Off B Fixed Channel # No Off C Fixed Channel # Yes Off See “Priority Scan” in section 3.12 of this manual for operational details of the Old-Style BK Priority Scan Modes. 2.2.2.
DMH Series VHF Radio Installation and Programming 2.2.2.7.5 SCAN LIST LOCK When function 5 is enabled (flashing), the user will not be able to change the channels in the Scan List. When disabled (steady), the user can enter or delete channels from the Scan List. See "Change the Scan List" in section 3.11.6 of this manual. PRG 1--12345 2.2.2.7.6 STORE GROUP ONE SETTINGS Once each function 1-5 is set as desired, you can store the changes, discard the changes, or disable all 5 functions.
Installation and Programming DMH Series VHF Radio Busy Channel Override - This function is similar to Busy Channel Lockout except the transmitter PTT can be activated by pressing the [CG] button. PRG 2--12345 To set Busy Channel operation, use the following chart: Busy Channel Function 2 Function 3 Indication Disable (Steady) Enable (Flashing) Lockout Enable (Flashing) Enable (Flashing) Override Enable (Flashing) Disable (Steady) 2.2.2.8.4 & 2.2.2.8.
DMH Series VHF Radio Installation and Programming 2.2.2.9.5 ALPHANUMERIC/NUMERIC DISPLAY MODE When function 5 is enabled (flashing), the display operates in Alphanumeric Mode, enabling the display of channel labels. When disabled (steady), the display operates in Numeric Display Mode. This mode displays channel numbers instead of labels. PRG 3--12345 2.2.2.9.
Installation and Programming DMH Series VHF Radio b. Press the [FCN] key to shift the display left by one position, leaving position 8 blank. c. Press the [PRI] key repeatedly to enter the next character, or press the [FCN] key a second time to enter a blank space. d. To abandon changes, press the [CLR] key, restoring the original label. Press the [ENT] key to store changes and go back to the starting point for Channel 0 settings. 2.2.2.
DMH Series VHF Radio 2.2.3.4 PRG Installation and Programming RECEIVE ANALOG CHANNEL GUARD RX CG 000.0 The next field is the Analog Channel Guard value for Channel 1 receive. This value is only used if the receive mode selected was Analog or Mixed, or if User Channel Guard is activated. The upper display will show ‘PRG RX CG' and the lower part of the display will show the programmed guard. NOTE: 0.0 indicates carrier squelch operation (no Channel Guard). 1.
Installation and Programming DMH Series VHF Radio 2. If a different Squelch Mode is desired, press the [PRI] key to toggle the setting. Then press the [ENT] key to store this setting and automatically advance to the next field. 2.2.3.7 TRANSMIT FREQUENCY PRG TX 148.00000 The upper part of the display will show ‘PRG TX.’ This is the transmitter frequency for Channel 1. 1. If it is correct, press the [FCN] key to advance to the next field. 2.
DMH Series VHF Radio Installation and Programming 2.2.3.10 TRANSMIT NAC PRG TX ID CG NACXXXX The next field is the Network Access Code (NAC) for Channel 1 transmit. This value is only used if the transmit mode selected was Digital or Mixed, or if User Channel Guard is activated. The upper part of the display will show ‘PRG TX ID CG’. The lower part of the display will show ‘NACXXXX’ where XXXX is the Network Access Code in decimal. 1.
Installation and Programming DMH Series VHF Radio 1. If the key is correct, press [FCN] to advance to the next field. 2. If a different key is desired, press [PRI] to cycle through the keys, or press the number buttons to directly enter the key number. 3. Press [ENT] to store the changes and advance to the next field. 2.2.3.14 TRANSMIT KEY LOCK (Only on models configured for encrypted operation) PRG TX ID KeY - sel The next field is the Transmit Key Lock option.
DMH Series VHF Radio 2.3 Installation and Programming CLONING RADIO SETTINGS A BK Radio D Series portable radio can transfer its programmed settings to a DMH radio by using a standard cloning cable. To clone a DMH radio from an G or E Series portable, a special cloning cable must be used. Alphanumeric display settings, including channel and group labels, are not transferred from the E Series portable. See your dealer for details concerning cloning between D and G or E Series radios.
Installation and Programming 2.3.1 DMH Series VHF Radio SPECIAL CLONING INSTRUCTIONS It is possible to change Channel 0 values on the portable radio, hold them in a temporary memory, and download them to the DMH without actually entering them into the permanent memory of the portable radio. This is convenient for sequential identification numbers used to identify a series of radios in a radio system.
DMH Series VHF Radio 2.4 Installation and Programming CTCSS CHANNEL GUARD VALUES The CTCSS Channel Guard system may be set for any frequency in the range of 67 to 255.9 Hz. However, since most systems adhere to the Electronic Industry Association (EIA) standards, tones should be selected from the following EIA list.
Installation and Programming 2.
SECTION III OPERATION 3.1 INTRODUCTION This section contains information concerning the operational procedures for BK Radio DMH APCO Project 25 digital mobile radios. To meet backwards compatibility as defined by the APCO Project 25 standard, the DMH digital mobile radio provides users the ability to interoperate with narrow or wide band analog channels as well as digital systems. Please take a moment to read the information in this manual so you can get optimum performance from your new radio. 3.1.
Operation 3.2.1 DMH Series VHF Radio RF ENERGY EXPOSURE AWARENESS AND CONTROL INFORMATION, AND OPERATIONAL INSTRUCTIONS FOR FCC OCCUPATIONAL USE REQUIREMENTS BEFORE USING YOUR MOBILE 2-WAY RADIO, READ THE INFORMATION BELOW WHICH CONTAINS IMPORTANT OPERATING INSTRUCTIONS FOR SAFE USAGE AND RF ENERGY AWARENESS AND CONTROL INFORMATION FOR COMPLIANCE WITH RF ENERGY EXPOSURE LIMITS IN APPLICABLE NATIONAL AND INTERNATIONAL STANDARDS.
Operation 3.2.3 DMH Series VHF Radio COMPLIANCE WITH RF EXPOSURE STANDARDS Your BK Radio 2-way radio is designed and tested to comply with a number of national and international standards and guidelines (listed below) for human exposure to radio frequency electromagnetic energy. This radio complies with the IEEE and ICNIRP exposure limits for occupational/controlled RF exposure environment at operating duty factors of up to 50% talk50% listen and is authorized by the FCC for occupational use only.
Operation DMH Series VHF Radio CONTACT INFORMATION For additional information on exposure requirements or other information, visit website http://www.relm.com. 3.3 3.4 SAFETY PRECAUTIONS • Do not operate the transmitter in close proximity to blasting caps. • Do not operate the radio in an explosive atmosphere (petroleum fuels, solvents, dust, etc.). • Do not operate the transmitter if a person outside the vehicle is less than three feet from the antenna or touching the antenna.
Operation DMH Series VHF Radio Select a channel by turning the Channel Selector knob. When the unstopped channel th selector is rotated past the highest (16 ) channel, the radio will emit a beep and st remain on the highest channel. When rotated past the lowest (1 ) channel, the radio will emit a beep and remain on the lowest channel. The display can show channel numbers (Numeric Mode), channel labels (Alphanumeric Mode), or receive and transmit frequencies.
Operation DMH Series VHF Radio When operating in Digital Mode, each channel can be programmed to use either Normal squelch or Selective squelch. A. Normal Squelch Normal squelch is used to mimic analog operation. Signals are only qualified with the programmed NAC. TGIDs and P25 Unit IDs are ignored. Each digital channel is programmed with a receive NAC and a transmit NAC. When an incoming signal’s NAC matches the channel’s programmed receive NAC, the radio unmutes. The default NAC is 659 ($293 hex).
Operation 3.6.4 DMH Series VHF Radio CHANNEL GUARD TRANSMIT Monitor the channel, before transmitting on Channel Guard channels, by lifting the microphone off hook or pressing the [MON] button. Listen to the channel for a few seconds to ensure that no communications are occurring on the channel. Press the PTT (Push-To-Talk) switch on the microphone. The TX annunciator appears on the display and the red Transmit indicator illuminates while the PTT is pressed.
Operation 3.8 DMH Series VHF Radio SECURE OPERATION The radio may optionally be configured for Secure communication on channels operating in Digital Mode. No encryption is available for analog channels. The receiver automatically detects both clear and secure signals. The transmitter selects clear or secure operation based on each channel’s programming. Digital channels can be programmed to always transmit encrypted, always transmit clear, or to select the Transmit Mode with the ‘TX Secure’ switch.
Operation 3.8.2 DMH Series VHF Radio ZEROIZATION The radio provides a method for the user to panic-zeroize all encryption keys. This service also sets all touchpad passwords to ‘FFFFFF’. The zeroization service is invoked as follows: • Press and hold the microphone’s [CLR] button. • Wait for the radio to start beeping and for the ‘ZERO ALL’ message to appear on the display. • While continuing to hold the [CLR] button, press and release the PTT switch. • Release the [CLR] button.
Operation DMH Series VHF Radio If a keypad microphone is used with the DMH radio, many of the functions above may also be enabled/disabled with the keypad [FCN] key. Not all microphones support these functions. Contact your dealer to determine which features are available with your microphone and have been enabled in the radio. 3.10.1 • Press the [FCN] key to display the function menu. • Press [PRI] to toggle the function on/off when the desired menu item is displayed.
Operation DMH Series VHF Radio PRI Priority Scan Press the [PRI] button to start or stop priority scanning. The PR annunciator and the flashing SCN annunciator appear on the display. If changes to the Priority 1 channel are allowed to make the current channel the fixed Priority 1 Channel, turn Scan and Priority Scan off, then press the [PRI] button and hold it down for 1 second or more. GRP Group Select Press the [GRP] button to toggle between Group Select and Channel Select Modes.
Operation DMH Series VHF Radio HOM Home Channel Press the [HOM] button to go to the pre-programmed Home Channel. To set a different Home Channel, select the desired channel using the Channel Selector knob, press the [HOM] button, and hold it for more than 1 second until the arrow above the HOM button appears on the display. The new channel then becomes the Home Channel. SPK Remote Speaker Press the [SPK] button to toggle between the built-in radio speaker and a remotely mounted speaker.
Operation DMH Series VHF Radio When a signal is detected, scanning stops and the message is received. The received channel is shown in place of the transmit channel. Once the signal ends, the radio continues to monitor the channel for the preset scan delay time before it resumes scanning. 3.11.1.1 BASIC SCAN 1. Press the SCN button to enable Scan (an arrow will appear above the button). 2. If Priority Scan is enabled, press the PRI button to turn it off.
Operation DMH Series VHF Radio Talkback Scan will not work if Priority Scan is also on and your radio is programmed to always transmit on the Priority 1 channel. 3.11.6 CHANGE THE SCAN LIST The radio can be programmed to enable the user to add or remove channels from the scan list. If user changes are enabled, follow these steps to change the scan list: 1. Turn Scan and Priority Scan off. 2. Select a channel to be added or removed from the scan list by turning the Channel Selector knob.
Operation DMH Series VHF Radio If a message is received on a priority channel, the radio receiver locks on to the priority channel and checks to see if the proper Channel Guard value is present. If the signal contains the proper Channel Guard value, the radio receives the message. Otherwise, the radio will re-check the channel every 4 seconds, until the activity on the channel ceases. 3.12.1 DUAL PRIORITY SCAN In each group, up to two of the 16 channels can be designated as priority channels.
Operation 3.12.4 DMH Series VHF Radio PRIORITY MODE B With Priority Scan on and Channel Scan off, the radio can receive on the knobselected channel while sampling the priority channel. If the priority channel becomes active, the Priority indicator lights up illuminates. The radio changes to the priority channel and holds for the duration of the transmission To reply to a message on the priority channel, turn the Channel Selector knob to the priority channel, and then transmit. 3.12.4.
Operation DMH Series VHF Radio 3. Press and hold the [PRI] button for more than 1 second. A short beep sounds and PR appears in the display, indicating that the displayed channel is now the priority channel. NOTE: If the radio is programmed for Dual Priority operation, only Priority 1 channel can be changed with the [PRI] button. NOTE: A channel can be the priority channel even if it is on the Scan List.
Operation DMH Series VHF Radio a Unit-To-Unit call. If the RTX channel is programmed for Mixed Mode transmit, transmissions will be made as digital Unit-To-Unit calls while the radio is in Unit-ToUnit Mode, regardless of the position of the ‘TX Digital’ switch. 3.13.2 INITIATING A UNIT-TO-UNIT CALL To initiate a Unit-To-Unit call, press the microphone’s [*] key to enter Unit-To-Unit Mode. The label of the last active (called or received) ID will appear on the display.
Operation DMH Series VHF Radio Press a number key (0 – 9) to go directly to the desired Call List ID, or press [PRI] repeatedly to cycle to the label of the ID to be re-programmed. Press and hold the [FCN] key to enter ID Programming Mode (PRG icon will be illuminated). As in keypad Programming Mode, normal radio function will be disabled until ID Programming Mode is exited. 3.13.6 PROGRAMMING A LABEL Press the [CLR] key. The display becomes blank. Press number keys to enter 0-9 in positions 1-7.
Operation DMH Series VHF Radio radio to transmit on the knob-selected channel with the emergency bit set, indicating an emergency condition. If the Channel Selector is changed, the Emergency Mode will follow to the newly selected channel. Cycle power to return the radio to normal operation. On channels programmed for analog transmissions, and channels programmed for Mixed Mode transmissions with the ‘TX Digital’ switch OFF, pressing PTT in Emergency Mode will result in a normal analog transmission. 3.
Operation DMH Series VHF Radio 3.16 OTHER OPERATIONAL FEATURES The BK Radio D Series radio is based on a microprocessor core that allows extra features and operational characteristics to be programmed into the radio. Your dealer can help define the best operational settings for your system and program them into the radio. 3.16.1 SCAN DELAY Scan delay lets the radio receive a response to a transmission before scanning the other channels for activity.
Operation 3.16.6 DMH Series VHF Radio BUSY CHANNEL If the radio has been programmed for Busy Channel operation, it will operate in one of the following three Modes: 3.16.6.1 • Busy Channel Indication • Busy Channel Lockout • Busy Channel Lockout with Override BUSY CHANNEL INDICATION The yellow Busy Channel Indicator glows if there is carrier activity on the selected channel.
Operation DMH Series VHF Radio 3.17 ALPHANUMERIC DISPLAY FEATURES The Alphanumeric Display can be programmed to operate in Numeric Mode, displaying channel numbers instead of labels. Display annunciators indicate the following information: ALPHANUMERIC INDICATION PR -Priority Channel PRG -Programming Mode TX -Transmit RX -Receive SCN -Scan List Channel -Flashing SCN indicates scanning in progress, and RX SCN indicates receiving on a scanned channel.
Operation 3.17.2 DMH Series VHF Radio GROUP LABELS The display can show group labels in addition to group numbers. To display a group label, turn scanning functions off, then: 1. Press the microphone’s [#] key to display the group number. 2. Press and hold the [#] key to display the group label. 3. Press the [ENT] key or wait for about 5 seconds to revert to normal radio operation. 3.
SECTION IV THEORY OF OPERATION 4.1 INTRODUCTION This section contains a description of equipment and a theory of operation for the BK Radio DMH APCO Project 25 digital VHF radio. To aid in understanding the operation of the equipment, schematic diagrams are found in Section VI of this manual. 4.2 EQUIPMENT DESCRIPTION The BK Radio DMH Series radio comprises the following sub-assemblies: 4.2.
Theory of Operation DMH Series VHF Radio 4.3 THEORY OF OPERATION 4.3.1 SYSTEM BOARD System board functions include: A. • Core Microprocessor • Synthesizer • Voltage Regulators • Baseband Signal Processor Core Microprocessor The core microprocessor communicates with the control head microprocessor and the baseband signal processor. It controls radio functions such as adjusting the deviation and receiver tuning. An EEPROM is used to store calibration and tuning data unique to each radio.
DMH Series VHF Radio C. General Information (3) Loop Filter – Smoothes the output of the Synthesizer IC to reduce undesired modulation of the VCO frequency. (4) VCO Coarse Tune Filter – When changing to a new frequency that requires a different Coarse Tune voltage, a switch is closed for a short time to allow the VCO control voltage to change to the new value rapidly. Otherwise the VCO Coarse Tune Filter provides a low noise voltage for setting the range of the VCO frequency.
Theory of Operation C. DMH Series VHF Radio Front End The preselectors are varactor-tuned direct coupled filters. The preamp Q7 provides gain to overcome filter losses and provide good noise performance. D. Front End Tuning U2 is a digital to analog converter that provides tuning voltages for each of the five varactor elements in the pre-selectors. E. Mixer/IF The mixer converts the RF input signal to an intermediate frequency of 16.9 MHz where it is filtered and amplified. F.
DMH Series VHF Radio C. General Information Antenna Switch The antenna switch connects either the power amplifier or the receiver to the antenna. It also provides isolation between the receiver and the power amplifier when the radio is transmitting. D. Directional Coupler A directional coupler and associated detectors provide DC voltages proportional to the forward and reflected power at the antenna connector. The voltages are used for power leveling and high VSWR protection. E.
SECTION V MAINTENANCE 5.1 INTRODUCTION This section contains test and alignment procedures for an operational BK Radio DMH APCO Project 25 digital mobile radio. This section also contains disassembly and assembly procedures. An understanding of the theory of operation is recommended before maintenance is attempted. 5.2 TEST EQUIPMENT REQUIRED A. RF Signal Generator HP8640 or equivalent B. Distortion Analyzer HP334A or equivalent C. Power Meter HP435B with 30 dB pad or equivalent D.
Maintenance C. DMH Series VHF Radio Chassis Inspect the chassis for deformation, dents, punctures, badly worn surfaces, damaged connectors, damaged fastener devices, loose or missing hardware, component corrosion, and damage to the finish. D. RF Coils Inspect all RF coils for broken leads, loose mountings, and loose, improperly soldered, or broken terminal connections. Check for crushed, scratched, cut, or charred windings.
DMH Series VHF Radio L. 5.3.2 5.3.3 Maintenance Terminal Connections Soldered 1. Inspect for cold-soldered or resin joints. These joints present a porous or dull, rough appearance. Check for strength of bond using the points of a tool. 2. Examine the terminals for excess solder, protrusions from the joint, pieces adhering to adjacent insulation, and particles lodged between joints, conductors, or other components. 3.
Maintenance 5.4 DMH Series VHF Radio DISASSEMBLY & ASSEMBLY The DMH radio has three major assemblies which contain the following circuit boards: • Control Head Assembly (at the front of the radio) Switch Board Control Board Options Board • Core Assembly (in the extruded housing) System Board RX/TX Board VCO Board PA Flex Circuit • PA Assembly (in the heatsink casting) Filter Board PA Board Accessory Board 5.4.1 UNIT DISASSEMBLY A.
DMH Series VHF Radio 5.4.2.1 Maintenance CONTROL BOARD 1. Pull off the two rotary knobs from the front of the radio and remove rubber resistance washer behind volume knobs. 2. Using the spanner tool, remove the nuts holding the rotary switches in place. NOTE: The spanner tool (076-01475-0000) has been modified for use with DMH radios. Older spanner tools may not have sufficient depth. NOTE: These 2 nuts do not have the same thread pitch and are not interchangeable.
Maintenance DMH Series VHF Radio 5.4.3 CORE ASSEMBLY 5.4.3.1 VCO AND RX/TX BOARDS 5.4.3.2 1. Remove the sheet metal shield from the RX/TX board by prying it up with a flat-blade screwdriver. 2. Remove the 4 screws from the VCO cover and lift off the VCO cover. 3. Carefully remove the VCO by lifting it from the center or prying it up evenly around the sides. 4.
DMH Series VHF Radio 5.4.4 Maintenance PA ASSEMBLY A. Using a 7/16" deepwell socket, remove the hex nut from the antenna connector on the back of the heatsink housing. B. Remove the 13 screws from the PA board. C. Remove the PA board from the heatsink housing by pushing the power connector and antenna connector. D. Remove the Accessory board by removing the one screw on the back. NOTE: During reassembly, press the heatsink housing evenly against the Core assembly while inserting the 4 screws.
Maintenance A. DMH Series VHF Radio Synthesizer Calibration This calibration records the required VCO pretuning voltage across the RF frequency band. This adjustment may be necessary if VCO components are replaced. No additional setup is required for this procedure. During the automatic calibration, the synthesizer will attempt to acquire several receive and transmit frequencies. For each test frequency, the pretune D/A converter voltage will be varied to determine the optimum value.
DMH Series VHF Radio Maintenance To set up for this procedure, connect a suitable 50Ω power meter to the antenna output of the radio. Output power must be observed while interactively adjusting the power. The final setting is recorded in the radio’s EEPROM memory. E. VCO Modulation Sensitivity This adjustment controls the maximum analog and digital mode FM deviation of the transmitter.
SECTION VI ILLUSTRATED PARTS LIST 6.1 INTRODUCTION This section helps you identify parts used in BK Radio’s DMH Series mobile radio. It includes Replacement Parts Lists for all major assemblies arranged from the Final Assembly down to an individual part level. Each List is followed by the corresponding Assembly Drawing (if required), Parts Placement Drawing, and Schematic Diagram. Parts itemized in the various lists meet BK Radio’s design specifications and are the recommended replacement parts. 6.
Illustrated Parts List DMH Series VHF Radio Table 6-1. Replacement Parts, Final Assembly - Dash Mount Item Reference Number Part Number Description ASY 1 7011-30963-900 DMH_PA_Bd_Heatsink_Assy ASY 2 7010-30966-000 Mob,Digtl.
DMH Series VHF Radio Illustrated Parts List J.E.
DMH Series VHF Radio Illustrated Parts List Table 6-2.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-2 Final Assembly – Remote Mount RF Unit Page 6-7
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-3 Interconnect Diagram – Dash Mount Page 6-9
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-4 Interconnect Diagram – Remote Mount Page 6-11
DMH Series VHF Radio Illustrated Parts List Table 6-3.
DMH Series VHF Radio Illustrated Parts List J.E.
DMH Series VHF Radio Illustrated Parts List Table 6-4.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-6 Control Head Assembly – Remote Mount Page 6-19
DMH Series VHF Radio Illustrated Parts List Table 6-5. Replacement Parts, Control Board (309-648, Rev. C) Item Reference Number Part Number ITM 1 1700-30964-800 PCB,DMH CONTROL BD. ITM 2 2005-20018-800 Disp,VF,EMH/EMV, ITM 3 1411-50701-300 Cushion,Mount-VFD,Molded,EM, B101 2503-02102-410 Bead,Ferrite,1K_Ohm,100MHz,0.1A,0603 B102 2503-02102-410 Bead,Ferrite,1K_Ohm,100MHz,0.1A,0603 B103 2503-02102-410 Bead,Ferrite,1K_Ohm,100MHz,0.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number C125 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C126 1570-03102-273 Cap,Cp,1000pF,X7R,10%,50V,0402 C127 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C128 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C129 1570-03102-273 Cap,Cp,1000pF,X7R,10%,50V,0402 C130 1570-03102-273 Cap,Cp,1000pF,X7R,10%,50V,0402 C131 1570-00105-777 Cp,Cap,1uF,X5R,10%,10V,0603 C132 1570-03102-273 Cap,Cp,1000pF,X7R,10%,50V,0402 C133 1
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number Q101 4823-30513-210 Xstr,PNP,Switching,SMBT2907A,SOT-23 Q105 4823-30680-102 Xstr,Dig,NPN,47K/47K,SC-70 Q115 4823-30680-104 Xstr,Dig,NPN,22K/22K,SC-70 R101 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R102 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R103 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R104 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R105 4734-01001-311 Res,CP,1.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number R131 4734-01000-311 Res,Cp,100_ohm,1%,1/16W,0402 R132 4734-02002-311 Res,Cp,20K,1%,1/16W,0402 R133 4734-01782-311 Res,Cp,17.8K,1/16W,1%,0402 R134 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R135 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R136 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R137 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R138 4734-01001-311 Res,CP,1.
DMH Series VHF Radio Illustrated Parts List J.E. Villanueva BK RADIO Figure 6-7.
DMH Series VHF Radio Illustrated Parts List J.E. Villanueva BK RADIO Figure 6-7.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-8.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-8.
DMH Series VHF Radio Illustrated Parts List Table 6-6. Replacement Parts, Options Board (309-577 Rev. C) – Dash Mount Item Reference Number Part Number ITM 1 2800-20019-000 Spacer,.096X.55 (Fastened to PCB) ITM 2 1700-30957-700 PCB,DMH,Option,Bd. B5 2503-20022-200 Ferrite,Bead,Surfc,Mt B6 2503-02121-505 Bead,Fer.,120_OHMS@100MHz,200ma,0402 B7 2503-02121-505 Bead,Fer.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number C31 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C32 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C33 1570-03104-777 Cap,Cp,0.
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number L2 1812-68915-261 Ind,Fxd,Pwr,6.8uH,20%,DO1813P-682HC L3 1812-68915-261 Ind,Fxd,Pwr,6.8uH,20%,DO1813P-682HC L4 1812-68915-261 Ind,Fxd,Pwr,6.8uH,20%,DO1813P-682HC L5 1812-68915-261 Ind,Fxd,Pwr,6.8uH,20%,DO1813P-682HC L6 1812-68915-261 Ind,Fxd,Pwr,6.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number R31 4732-00000-008 Res,CP,0_Ohm, R32 4732-00000-008 Res,CP,0_Ohm, R33 4732-00000-008 Res,CP,0_Ohm, R34 4732-00000-008 Res,CP,0_Ohm, R35 4732-00000-008 Res,CP,0_Ohm, R36 4732-00000-008 Res,CP,0_Ohm, S1 5110-30910-602 Switch,Poly,miniSMDM075/24 U1 3130-20042-610 IC,Class-D Stereo,PA,LX1722CDB U2 3134-30950-510 IC,N-CH,PwrTrench,FDS6912 U3 3134-30950-500 IC,P-CH,PwrTrench,FDS4953 U4 3134-30950-500
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-9.1 Options Board (309-577, Rev. C) – Dash Mount [Sheet 1- Top Side] Page 6-37 J.E. Villanueva - J.E.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-9.2 Options Board (309-577, Rev. C) – Dash Mount [Sheet 2- Bottom Side] Page 6-39 J.E. Villanueva - J.E.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-10 Options Board Schematic – Dash Mount Page 6-41
DMH Series VHF Radio Illustrated Parts List Table 6-7.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-11 Options Board- Remote Mount Page 6-45
DMH Series VHF Radio BK RADIO Figure 6-12 Options Board Schematic – Remote Mount Illustrated Parts List Page 6-47
DMH Series VHF Radio Illustrated Parts List Table 6-8 Replacement Parts, Switch Board (607-006 Rev.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-13 Switch Board (607-006, Rev. D) Page 6-51 R.K. - ENGR 11/93 J.S. - L940022 4/94 J.D - J.E.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-14 Switch Board Schematic Page 6-53
DMH Series VHF Radio Illustrated Parts List Table 6-9 Replacement Parts, Core Assembly Item Reference Number Part Number ASSY 1 7031-30958-700 DMH, System Bd., SMD ASSY 2 7031-30958-600 DMH, R/T Bd.
DMH Series VHF Radio Illustrated Parts List J.E.
DMH Series VHF Radio Illustrated Parts List Table 6-10. Replacement Parts, RX/TX Board (309-586, Rev. B) Item Reference Number Part Number ITM 1 1700-30958-600 PCB, DMH_R/T Bd. ITM 2 3110-20019-401 Insulator,Xtal (QTY 2) ITM 3 6022-00000-001 Wire,Buss,22GA,Tin ITM 4 2508-30968-401 Shield, Solder Down, RxTx ITM 5 2508-30968-401 Shield, Solder Down, RxTx C1 1570-00102-163 Cap,CP,1.0nF,5%,COG,50V,0603, C2 1570-00102-163 Cap,CP,1.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number C28 1570-00220-163 Cap,CP,22pF,5%,COG,50V,0603, C29 1570-00104-272 Cap,Cp,.1uF,10%,X7R,25V,0603 C30 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C31 1570-03910-163 Cap,CP,91pF,NPO,5%,50V,0402 C32 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C33 1570-03150-163 Cap,CP,15pF,NPO,5%,50V,0402 C34 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C35 1570-03508-173 Cap,Cp,0.
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number C62 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C63 1570-00104-272 Cap,Cp,.1uF,10%,X7R,25V,0603 C64 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C65 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C66 1570-03221-163 Cap,Cp,220PF,NPO,5%,50V,0402 C67 1570-03222-273 Cap,CP,2200pF,X7R,10%,50V,0402 C68 1570-00224-277 Cap,CP,0.22uF,10%,X7R,10V,0603, C69 1570-00223-273 Cap,Cp,.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number C96 1570-03220-163 Cap,Cp,22pF,5%,NPO,50V,0402 C97 1570-03220-163 Cap,Cp,22pF,5%,NPO,50V,0402 C98 1570-03220-163 Cap,Cp,22pF,5%,NPO,50V,0402 C111 1570-00102-163 Cap,CP,1.0nF,5%,COG,50V,0603, C112 1570-00102-163 Cap,CP,1.0nF,5%,COG,50V,0603, C113 1570-00339-163 Cap,Cp,3.3pF,5%,NPO,50V,0603 C114 1570-00104-272 Cap,Cp,.1uF,10%,X7R,25V,0603 C115 1570-00102-163 Cap,CP,1.
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number FB1 2503-02121-505 Bead,Fer.,120_OHMS@100MHz,200ma,0402 FB2 2503-02121-505 Bead,Fer.,120_OHMS@100MHz,200ma,0402 FB3 2503-02121-505 Bead,Fer.,120_OHMS@100MHz,200ma,0402 FB4 2503-02121-505 Bead,Fer.,120_OHMS@100MHz,200ma,0402 FB5 2503-02121-505 Bead,Fer.,120_OHMS@100MHz,200ma,0402 FB6 2503-02121-505 Bead,Fer.,120_OHMS@100MHz,200ma,0402 FL1 2705-20022-600 Fltr,Xtal,16.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number L20 1812-68003-020 Ind,Cp,68nH,5%,0805CS L21 1812-82103-020 Ind,Cp,820nH,5%,0805 L22 1812-10913-091 Ind,Cp,1.
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number R14 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R15 4728-03570-315 Res,Cp,357_Ohms,1%,1/4W,1206 R16 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R17 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R18 4734-02003-311 Res,Cp,200K,1%,1/16W,0402 R19 4734-01213-311 Res,CP,121K,1%,1/16W,0402 R20 4732-02210-511 Res,Cp,221_Ohm,1%,1/16W,0603 R21 4734-01213-311 Res,CP,121K,1%,1/16W,0402 R22 4732-02379-511 Res,Cp,23.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number R49 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R50 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R51 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R52 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R53 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R54 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R55 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R56 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R57 4734-01009-311 R
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number R83 4732-01159-511 Res,Cp,11.5_Ohm,1%,1/16W,0603 R84 4732-04320-511 Res,Cp,432_Ohm,1%,1/16W,0603 R85 4734-02001-311 Res,CP,2K,1%,1/16W,0402 R86 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R88 4734-01004-311 Res,Cp,1M,1%,1/16W,0402 R89 4734-01002-311 Res,CP,10K,1%,1/16W,0402 R90 4734-01000-311 Res,Cp,100_ohm,1%,1/16W,0402 R91 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R92 4734-01001-311 Res,CP,1.
DMH Series VHF Radio Illustrated Parts List J.E. Villanueva J.E. Villanueva BK RADIO Figure 6-16.1 RX/TX Board Drawing (309-586, Rev.
DMH Series VHF Radio Illustrated Parts List J.E. Villanueva J.E. Villanueva BK RADIO Figure 6-16.2 RX/TX Board Drawing (309-586, Rev.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-17.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-17.
DMH Series VHF Radio Illustrated Parts List Table 6-11. Replacement Parts, System Board (309-587, Rev. C) Item Reference Number Part Number ITM 1 1700-30958-700 PCB, DMH System Bd. ITM 2 1601-20000-903 Tape,Foam,3/8WX1/16th, C501 1552-60463-127 Cap,Cp_Tant,15UF,10%,25V,125D,7243, C502 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C503 1570-02225-271 Cap,CP,2.2uF,X7R,10%,16V,1206 C504 1570-02225-271 Cap,CP,2.2uF,X7R,10%,16V,1206 C505 1570-01224-271 Cap,CP,.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number C535 1513-20012-054 Cap,E,1000UF,+/-20%,25V,85D,10X20mm C536 1553-50237-780 Cap,Cp,.1UF,5%,X7R,50V,1206, C538 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C540 1570-03102-271 Cap,CP,1000pf,10%,X7R,10V,0402 C541 1570-00103-273 Cap,CP,10nF,10%,X7R,50V,0603, C542 1570-03102-271 Cap,CP,1000pf,10%,X7R,10V,0402 C549 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C550 1570-03103-261 Cap,Cp,.
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number C626 1572-00105-734 Cap,Cp,1.0uF,Film,20%,16V,1210 C627 1570-00104-272 Cap,Cp,.1uF,10%,X7R,25V,0603 C628 1570-00223-273 Cap,Cp,.022uF,X7R,10%,50V,0603 C629 1570-00223-273 Cap,Cp,.022uF,X7R,10%,50V,0603 C630 1570-00103-273 Cap,CP,10nF,10%,X7R,50V,0603, C631 1570-03509-113 Cap,Cp,5pF,NPO,+/-0.25pF,50V,0402 C632 1570-00103-273 Cap,CP,10nF,10%,X7R,50V,0603, C633 1570-00102-163 Cap,CP,1.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number C717 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C718 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C719 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C720 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C721 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C722 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C723 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C724 1570-03103-261 Cap,Cp,.
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number C751 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C752 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C753 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C755 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C756 1570-03101-163 Cap,Cp,100PF,NPO,5%,50V,0402 C757 1570-03103-261 Cap,Cp,.01uF,5%,X7R,16V,0402 C758 1570-03103-261 Cap,Cp,.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number Description FB704 2503-02121-505 Bead,Fer.,120_OHMS@100MHz,200ma,0402 FB705 2503-02121-505 Bead,Fer.,120_OHMS@100MHz,200ma,0402 FB706 2503-02121-505 Bead,Fer.
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number R506 4734-01501-311 Res,CP,1.5K,1%,1/16W,0402 R507 4718-50237-354 Res,Cp,4300_Ohm,1/8W,5%,1206, R508 4734-01009-311 Res,Cp,10_Ohms,1/16W,1%,0402 R509 4728-00309-335 Res,Cp,3_Ohm,1/4W,5% R510 4734-01373-311 Res,CP,137K,1%,1/16W,0402 R511 4734-01503-311 Res,CP,150K,1%,1/16W,0402 R512 4734-03653-311 Res,Cp,365K,1/16W,1%,0402 R513 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R514 4734-02492-311 Res,Cp,24.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number R546 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R548 4734-01002-311 Res,CP,10K,1%,1/16W,0402 R549 4734-01002-311 Res,CP,10K,1%,1/16W,0402 R550 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R551 4734-01003-311 Res,CP,100K,1%,1/16W,0402 R552 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R553 4734-01002-311 Res,CP,10K,1%,1/16W,0402 R554 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R555 4734-01001-311 Res,CP,1.
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number R582 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R583 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R586 4734-01000-311 Res,Cp,100_ohm,1%,1/16W,0402 R587 4734-01000-311 Res,Cp,100_ohm,1%,1/16W,0402 R588 4734-01000-311 Res,Cp,100_ohm,1%,1/16W,0402 R589 4734-01000-311 Res,Cp,100_ohm,1%,1/16W,0402 R592 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R593 4734-01001-311 Res,CP,1.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number R623 4734-01002-311 Res,CP,10K,1%,1/16W,0402 R625 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R626 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R627 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R628 4734-01004-311 Res,Cp,1M,1%,1/16W,0402 R629 4734-01004-311 Res,Cp,1M,1%,1/16W,0402 R630 4734-02491-311 Res,Cp,2.
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number R719 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R720 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R721 4734-01001-311 Res,CP,1.00K,1%,1/16W,0402 R722 4734-01001-311 Res,CP,1.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number U501 3134-20040-900 Ic,DMX,HCF4053,SO16, U503 3134-30950-501 IC,P-Ch,30V,PwrTrench,FDS6679,S0-8 U504 3134-30670-403 IC,RGA,LP2951CM,SO8, U505 3134-30950-402 IC,DC/DC,Invert,LT1617ES5-1,SOT23-5 U506 3134-20083-004 IC,Dig,Pot,AD5160BRJ10,SOT-23 U507 3134-20082-401 IC,MCU,MC9S08GB60FU,QFB U508 3134-30670-413 IC,OPA,LM2904D,SO8 U509 3134-30911-003 IC,OP_AMP,R/R,LT1783CS5,SOT-23 U510 3134-30940-810 IC,DUAL
DMH Series VHF Radio Illustrated Parts List 4 3 2 ```````````````````` 1 REV VER C 3 REVISION DRAWN BY: CHK BY: J.E. Villanueva APPRD. BY: EN: C. McClanahan - DATE: 07-28-05 FR FORMAL RELEASE D D C C B B A THIS DRAWING IS PROPERTY OF RELM COMMUNICATION AND SHALL NOT BE REPRODUCED, COPIED OR USED AS THE BASIS FOR MANUFACTURE OR SALE OF PRODUCTS WITHOUT PERMISSION. TOP SIDE RELM 2 PLACE DIM. .02 3 PLACE DIM. .
DMH Series VHF Radio Illustrated Parts List 4 3 2 1 REV VER C 3 REVISION DRAWN BY: CHK BY: J.E. Villanueva - APPRD. BY: EN: C. McClanahan DATE: FR 07-28-05 FORMAL RELEASE D D C C SH1 Placed Over U701 & U702 Components B B BOTTOM SIDE A THIS DRAWING IS PROPERTY OF RELM COMMUNICATION AND SHALL NOT BE REPRODUCED, COPIED OR USED AS THE BASIS FOR MANUFACTURE OR SALE OF PRODUCTS WITHOUT PERMISSION.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-19.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-19.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-19.
DMH Series VHF Radio Illustrated Parts List Table 6-12. Replacement Parts, VCO Board (309-647, Rev. A) Item Reference Number Part Number ITM 1 1700-30964-700 PCB,DMH VCO BD. B1 2503-20022-300 Ferrite,Bead,Surfc,Mt C1 1553-50313-582 Cap,Cp,1000PF,5%,NPO,50V,0805, C2 1553-50313-582 Cap,Cp,1000PF,5%,NPO,50V,0805, C3 1553-50237-768 Cap,Cp,39PF,5%,NPO,50V,0805, C4 1553-50313-582 Cap,Cp,1000PF,5%,NPO,50V,0805, C5 1553-50237-780 Cap,Cp,.
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number L5 1808-20013-628 Ind,Fxd_Coil,1000NH@25MHz,Q=38,SMD L7 1808-20013-649 Ind,Fxd_Coil,68NH@50MHz,Q=50,SMD P61 2107-50231-702 Term,Contact,Pin,W/Star P62 2107-50231-702 Term,Contact,Pin,W/Star P63 2107-50231-702 Term,Contact,Pin,W/Star P65 2107-50231-702 Term,Contact,Pin,W/Star P66 2107-50231-702 Term,Contact,Pin,W/Star P71 2107-50231-704 Term,Contact,Pin,W/Star, P72 2107-50231-702 Term,Contact,Pin,W/Sta
DMH Series VHF Radio Illustrated Parts List J.E. Villanueva BK RADIO Figure 6-20 VCO Board (309-647, Rev.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-21 VCO Board Schematic Page 6-103
DMH Series VHF Radio Illustrated Parts List Table 6-13.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-22 Interface Board Drawing – Remote Mount Page 6-107
DMH Series VHF Radio BK RADIO Figure 6-23 Interface Board Schematic – Remote Mount Illustrated Parts List Page 6-109
DMH Series VHF Radio Illustrated Parts List Table 6-14.
DMH Series VHF Radio Illustrated Parts List J.E.
DMH Series VHF Radio Illustrated Parts List Table 6-15 Replacement Parts, PA Board (309-639, D) Item Reference Number Part Number ITM1 1700-30963-900 PCB,DMH PA BD ITM 2 2508-30969-201 Shield, PA Module B101 2503-20022-200 Ferrite,Bead,Surfc,Mt B102 2503-20022-300 Ferrite,Bead,Surfc,Mt B103 2503-20022-200 Ferrite,Bead,Surfc,Mt C101 1575-02100-171 Cap,Cp,10pF,5%,NPO,250V,0805 C102 1575-02390-171 Cap,Cp,39pF,5%, NPO, 250V,0805 C103 1575-02270-171 Cap,Cp,27pF,5%,NPO,250V,0805 C104
Illustrated Parts List DMH Series VHF Radio Item Reference Number Part Number C131 1570-00102-163 Cap,CP,1.0nF,5%,COG,50V,0603, C132 1575-02159-121 Cp,Cap,1.5pF,+/-.1pF,NPO,250V,0805 C133 1570-00102-163 Cap,CP,1.
DMH Series VHF Radio Illustrated Parts List Item Reference Number Part Number R105 4732-00120-531 Res,Cp,12_Ohm,5%,1/16W,0603 R106 4732-01132-511 Res,Cp,11.3K,1%,1/16W,0603 R107 4732-08872-511 Res,Cp,88.
DMH Series VHF Radio Illustrated Parts List BOTTOM SIDE TOP SIDE BK RADIO Figure 6-25 PA Board (309-639, Rev.
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-26 PA Board Schematic Page 6-121
DMH Series VHF Radio Illustrated Parts List Table 6-16 Replacement Parts, Filter Assembly (309-655, Rev. A) Item Reference Number Part Number ITM 1 1700-30965-500 PCB,DMH FILTER BD.
DMH Series VHF Radio 4 Illustrated Parts List 3 2 REV VER A 1 1 REVISION DRAWN BY: CHK BY: J.E. Villanueva APPRD. BY: T. Wilkey - EN: DATE: FR 08-03-05 FORMAL RELEASE D D C C B B TOP SIDE A A THIS DRAWING IS PROPERTY OF RELM COMMUNICATION AND SHALL NOT BE REPRODUCED, COPIED OR USED AS THE BASIS FOR MANUFACTURE OR SALE OF PRODUCTS WITHOUT PERMISSION. RELM TM UNLESS OTHERWISE SPECIFIED DIMENSIONS TITLE: ARE IN INCHES AND INCLUDE APPLIED FINISH TOLERANCES TOLERANCES 2 PLACE DIM.
DMH Series VHF Radio Illustrated Parts List Table 6-17 Replacement Parts, Accessory Board – Dash Mount Item Reference Number Part Number ITM 1 1700-60700-700 Bd,Pc,Accy,EMH C1 1553-50313-531 Cap,Cp,100PF,5%,NPO,50V,0805 C2 1553-50313-531 Cap,Cp,100PF,5%,NPO,50V,0805 C3 1553-50313-531 Cap,Cp,100PF,5%,NPO,50V,0805 C4 1553-50313-531 Cap,Cp,100PF,5%,NPO,50V,0805 C5 1553-50313-531 Cap,Cp,100PF,5%,NPO,50V,0805 C6 1553-50313-531 Cap,Cp,100PF,5%,NPO,50V,0805 C7 1553-50313-531 Cap,Cp,100P
DMH Series VHF Radio BK RADIO Illustrated Parts List Figure 6-28 Accessory Board Drawing – Dash Mount Page 6-129
DMH Series VHF Radio BK RADIO Figure 6-29 Accessory Board Schematic – Dash Mount Illustrated Parts List Page 6-131