BK Radio DMH Operations Instructions

BK RADIO Page i TABLE OF CONTENTS SECTION I GENERAL INFORMATION 1.1 INTRODUCTION ...

Installation and Programming DMH Series VHF Radio Page 2-2 BK RADIO 8. Mount the microphone hanger clip securely to the desired location. The micr

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-15 Core Assembly Page 6-57 J.E. Villanueva

DMH Series VHF Radio Illustrated Parts List BK RADIO RX/TX Board Page 6-59 Table 6-10. Replacement Parts, RX/TX Board (309-586, Rev. B) Item Referen

Illustrated Parts List DMH Series VHF Radio Page 6-60 RX/TX Board BK RADIO Item Reference Number Part Number Description C28 1570-00220-163 Cap

DMH Series VHF Radio Illustrated Parts List BK RADIO RX/TX Board Page 6-61 Item Reference Number Part Number Description C62 1570-03101-163 Cap,

Illustrated Parts List DMH Series VHF Radio Page 6-62 RX/TX Board BK RADIO Item Reference Number Part Number Description C96 1570-03220-163 Cap

DMH Series VHF Radio Illustrated Parts List BK RADIO RX/TX Board Page 6-63 Item Reference Number Part Number Description FB1 2503-02121-505 Bead

Illustrated Parts List DMH Series VHF Radio Page 6-64 RX/TX Board BK RADIO Item Reference Number Part Number Description L20 1812-68003-020 Ind

DMH Series VHF Radio Illustrated Parts List BK RADIO RX/TX Board Page 6-65 Item Reference Number Part Number Description R14 4734-01001-311 Res,

Illustrated Parts List DMH Series VHF Radio Page 6-66 RX/TX Board BK RADIO Item Reference Number Part Number Description R49 4734-01009-311 Res

DMH Series VHF Radio Illustrated Parts List BK RADIO RX/TX Board Page 6-67 Item Reference Number Part Number Description R83 4732-01159-511 Res,

DMH Series VHF Radio Installation and Programming BK RADIO Page 2-3 Figure 2-1 Installation – Dash Mount

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-16.1 RX/TX Board Drawing (309-586, Rev. C) Page 6-69 [Sheet 1 – Top Side] J.E. Vill

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-16.2 RX/TX Board Drawing (309-586, Rev. C) Page 6-71 [Sheet 2 – Bottom Side] J.E. V

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-17.1 RX/TX Board Schematic Page 6-73 [Sheet 1]

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-17.2 RX/TX Board Schematic Page 6-75 [Sheet 2]

DMH Series VHF Radio Illustrated Parts List BK RADIO System Board Page 6-77 Table 6-11. Replacement Parts, System Board (309-587, Rev. C) Item Refer

Illustrated Parts List DMH Series VHF Radio Page 6-78 System Board BK RADIO Item Reference Number Part Number Description C535 1513-20012-054 C

DMH Series VHF Radio Illustrated Parts List BK RADIO System Board Page 6-79 Item Reference Number Part Number Description C626 1572-00105-734 Ca

Illustrated Parts List DMH Series VHF Radio Page 6-80 System Board BK RADIO Item Reference Number Part Number Description C717 1570-03101-163 C

DMH Series VHF Radio Illustrated Parts List BK RADIO System Board Page 6-81 Item Reference Number Part Number Description C751 1570-03101-163 Ca

Illustrated Parts List DMH Series VHF Radio Page 6-82 System Board BK RADIO Item Reference Number Part Number Description FB704 2503-02121-505

Installation and Programming DMH Series VHF Radio Page 2-4 BK RADIO 2.2 PROGRAMMING There are three different ways to program BK Radio radios: • B

DMH Series VHF Radio Illustrated Parts List BK RADIO System Board Page 6-83 Item Reference Number Part Number Description R506 4734-01501-311 Re

Illustrated Parts List DMH Series VHF Radio Page 6-84 System Board BK RADIO Item Reference Number Part Number Description R546 4734-01001-311 R

DMH Series VHF Radio Illustrated Parts List BK RADIO System Board Page 6-85 Item Reference Number Part Number Description R582 4734-01001-311 Re

Illustrated Parts List DMH Series VHF Radio Page 6-86 System Board BK RADIO Item Reference Number Part Number Description R623 4734-01002-311 R

DMH Series VHF Radio Illustrated Parts List BK RADIO System Board Page 6-87 Item Reference Number Part Number Description R719 4734-01001-311 Re

Illustrated Parts List DMH Series VHF Radio Page 6-88 System Board BK RADIO Item Reference Number Part Number Description U501 3134-20040-900 I

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-18.1 System Board (309-587, Rev. C) Page 6-89 [Sheet 1 – Top Side] ````````````````

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-18.2 System Board (309-587, Rev. C) Page 6-91 [Sheet 2 – Bottom Side] DCBA1234ABCD4

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-19.1 System Board Schematic Page 6-93 [Sheet 1]

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-19.2 System Board Schematic Page 6-95 [Sheet 2]

DMH Series VHF Radio Installation and Programming BK RADIO Page 2-5 2.2.2 GENERAL SETTINGS (CHANNEL 0) Channel 0 settings for each group must be p

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-19.3 System Board Schematic Page 6-97 [Sheet 3]

DMH Series VHF Radio Illustrated Parts List BK RADIO VCO Board Page 6-99 Table 6-12. Replacement Parts, VCO Board (309-647, Rev. A) Item Reference

Illustrated Parts List DMH Series VHF Radio Page 6-100 VCO Board BK RADIO Item Reference Number Part Number Description L5 1808-20013-628 Ind,F

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-20 VCO Board (309-647, Rev. A) Page 6-101 J.E. Villanueva-

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-21 VCO Board Schematic Page 6-103

DMH Series VHF Radio Illustrated Parts List BK RADIO Interface Board – Remote Mount Page 6-105 Table 6-13. Replacement Parts, Interface Board – Re

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-22 Interface Board Drawing – Remote Mount Page 6-107

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-23 Interface Board Schematic – Remote Mount Page 6-109

DMH Series VHF Radio Illustrated Parts List BK RADIO High Level PA Assembly Page 6-111 Table 6-14. Replacement Parts, High Level PA Assembly Item R

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-24 High Level PA Assembly Page 6-113 J.E. Villanueva

Installation and Programming DMH Series VHF Radio Page 2-6 BK RADIO 2.2.2.1 GROUP PASSWORD 1. After entering Programming Mode the display will sho

DMH Series VHF Radio Illustrated Parts List BK RADIO PA Board Page 6-115 Table 6-15 Replacement Parts, PA Board (309-639, D) Item Reference Numbe

Illustrated Parts List DMH Series VHF Radio Page 6-116 PA Board BK RADIO Item Reference Number Part Number Description C131 1570-00102-163 Cap,

DMH Series VHF Radio Illustrated Parts List BK RADIO PA Board Page 6-117 Item Reference Number Part Number Description R105 4732-00120-531 Res,

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-25 PA Board (309-639, Rev. D) Page 6-119 BOTTOM SIDETOP SIDE

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-26 PA Board Schematic Page 6-121

DMH Series VHF Radio Illustrated Parts List BK RADIO Filter Board Page 6-123 Table 6-16 Replacement Parts, Filter Assembly (309-655, Rev. A) Item

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-27 Filter Board Drawing Page 6-125 FILTER BD, DMH1 OF 1EN:CHK BY:DRAWN BY: DATE:REVIS

DMH Series VHF Radio Illustrated Parts List BK RADIO Accessory Board Page 6-127 Table 6-17 Replacement Parts, Accessory Board – Dash Mount Item R

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-28 Accessory Board Drawing – Dash Mount Page 6-129

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-29 Accessory Board Schematic – Dash Mount Page 6-131

DMH Series VHF Radio Installation and Programming BK RADIO Page 2-7 2.2.2.4 SCAN DELAY TIME After the Time-Out Timer is set, the upper display wil

Installation and Programming DMH Series VHF Radio Page 2-8 BK RADIO 2.2.2.6.1 OLD-STYLE BK PRIORITY SCAN The radio can be programmed to mimic the

DMH Series VHF Radio Installation and Programming BK RADIO Page 2-9 2.2.2.7.5 SCAN LIST LOCK When function 5 is enabled (flashing), the user will

Installation and Programming DMH Series VHF Radio Page 2-10 BK RADIO Busy Channel Override - This function is similar to Busy Channel Lockout excep

DMH Series VHF Radio Installation and Programming BK RADIO Page 2-11 2.2.2.9.5 ALPHANUMERIC/NUMERIC DISPLAY MODE When function 5 is enabled (flash

Table of Contents DMH Series VHF Radio Page ii BK RADIO 2.2.3.7 TRANSMIT FREQUENCY...

Installation and Programming DMH Series VHF Radio Page 2-12 BK RADIO b. Press the [FCN] key to shift the display left by one position, leaving posi

DMH Series VHF Radio Installation and Programming BK RADIO Page 2-13 2.2.3.4 RECEIVE ANALOG CHANNEL GUARD The next field is the Analog Channel Gua

Installation and Programming DMH Series VHF Radio Page 2-14 BK RADIO 2. If a different Squelch Mode is desired, press the [PRI] key to toggle the

DMH Series VHF Radio Installation and Programming BK RADIO Page 2-15 2.2.3.10 TRANSMIT NAC The next field is the Network Access Code (NAC) for Chan

Installation and Programming DMH Series VHF Radio Page 2-16 BK RADIO 1. If the key is correct, press [FCN] to advance to the next field. 2. If a

DMH Series VHF Radio Installation and Programming BK RADIO Page 2-17 2.3 CLONING RADIO SETTINGS A BK Radio D Series portable radio can transfer it

Installation and Programming DMH Series VHF Radio Page 2-18 BK RADIO 2.3.1 SPECIAL CLONING INSTRUCTIONS It is possible to change Channel 0 values o

DMH Series VHF Radio Installation and Programming BK RADIO Page 2-19 2.4 CTCSS CHANNEL GUARD VALUES The CTCSS Channel Guard system may be set for

Installation and Programming DMH Series VHF Radio Page 2-20 BK RADIO 2.6 QUICK REFERENCE – CHANNEL 0 RADIO MICROPHONE PROGRAMMING Group Password

BK RADIO Page 3-1 SECTION III OPERATION 3.1 INTRODUCTION This section contains information concerning the operational procedures for BK Radio DMH AP

DMH Series VHF Radio Table of Contents BK RADIO Page iii 3.11 SCAN OPERATION...

Operation DMH Series VHF Radio Page 3-2 BK RADIO 3.2.1 RF ENERGY EXPOSURE AWARENESS AND CONTROL INFORMATION, AND OPERATIONAL INSTRUCTIONS FOR FCC

Operation DMH Series VHF Radio BK RADIO Page 3-3 3.2.3 COMPLIANCE WITH RF EXPOSURE STANDARDS Your BK Radio 2-way radio is designed and tested to c

Operation DMH Series VHF Radio Page 3-4 BK RADIO CONTACT INFORMATION For additional information on exposure requirements or other information, visi

Operation DMH Series VHF Radio BK RADIO Page 3-5 Select a channel by turning the Channel Selector knob. When the unstopped channel selector is rota

Operation DMH Series VHF Radio Page 3-6 BK RADIO When operating in Digital Mode, each channel can be programmed to use either Normal squelch or Sel

Operation DMH Series VHF Radio BK RADIO Page 3-7 3.6.4 CHANNEL GUARD TRANSMIT Monitor the channel, before transmitting on Channel Guard channel

Operation DMH Series VHF Radio Page 3-8 BK RADIO 3.8 SECURE OPERATION The radio may optionally be configured for Secure communication on channels o

Operation DMH Series VHF Radio BK RADIO Page 3-9 3.8.2 ZEROIZATION The radio provides a method for the user to panic-zeroize all encryption keys.

Operation DMH Series VHF Radio Page 3-10 BK RADIO If a keypad microphone is used with the DMH radio, many of the functions above may also be enable

Operation DMH Series VHF Radio BK RADIO Page 3-11 PRI Priority Scan Press the [PRI] button to start or stop priority scanning. The PR annunciator a

Table of Contents DMH Series VHF Radio Page iv BK RADIO 4.3 THEORY OF OPERATION...

Operation DMH Series VHF Radio Page 3-12 BK RADIO HOM Home Channel Press the [HOM] button to go to the pre-programmed Home Channel. To set a differ

Operation DMH Series VHF Radio BK RADIO Page 3-13 When a signal is detected, scanning stops and the message is received. The received channel is sh

Operation DMH Series VHF Radio Page 3-14 BK RADIO Talkback Scan will not work if Priority Scan is also on and your radio is programmed to always tr

Operation DMH Series VHF Radio BK RADIO Page 3-15 If a message is received on a priority channel, the radio receiver locks on to the priority chann

Operation DMH Series VHF Radio Page 3-16 BK RADIO 3.12.4 PRIORITY MODE B With Priority Scan on and Channel Scan off, the radio can receive on th

Operation DMH Series VHF Radio BK RADIO Page 3-17 3. Press and hold the [PRI] button for more than 1 second. A short beep sounds and PR appears i

Operation DMH Series VHF Radio Page 3-18 BK RADIO a Unit-To-Unit call. If the RTX channel is programmed for Mixed Mode transmit, transmissions wil

Operation DMH Series VHF Radio BK RADIO Page 3-19 Press a number key (0 – 9) to go directly to the desired Call List ID, or press [PRI] repeatedly

Operation DMH Series VHF Radio Page 3-20 BK RADIO radio to transmit on the knob-selected channel with the emergency bit set, indicating an emergenc

Operation DMH Series VHF Radio BK RADIO Page 3-21 3.16 OTHER OPERATIONAL FEATURES The BK Radio D Series radio is based on a microprocessor core tha

DMH Series VHF Radio Table of Contents BK RADIO Page v SECTION VI ILLUSTRATED PARTS LIST 6.1 INTRODUCTION ...

Operation DMH Series VHF Radio Page 3-22 BK RADIO 3.16.6 BUSY CHANNEL If the radio has been programmed for Busy Channel operation, it will opera

Operation DMH Series VHF Radio BK RADIO Page 3-23 3.17 ALPHANUMERIC DISPLAY FEATURES The Alphanumeric Display can be programmed to operate in Nume

Operation DMH Series VHF Radio Page 3-24 BK RADIO 3.17.2 GROUP LABELS The display can show group labels in addition to group numbers. To displa

BK RADIO Page 4-1 SECTION IV THEORY OF OPERATION 4.1 INTRODUCTION This section contains a description of equipment and a theory of operation for the

Theory of Operation DMH Series VHF Radio Page 4-2 BK RADIO 4.3 THEORY OF OPERATION 4.3.1 SYSTEM BOARD System board functions include: • Core Micr

DMH Series VHF Radio General Information BK RADIO Page 4-3 (3) Loop Filter – Smoothes the output of the Synthesizer IC to reduce undesired modulati

Theory of Operation DMH Series VHF Radio Page 4-4 BK RADIO C. Front End The preselectors are varactor-tuned direct coupled filters. The preamp Q7

DMH Series VHF Radio General Information BK RADIO Page 4-5 C. Antenna Switch The antenna switch connects either the power amplifier or the receiver

BK RADIO Page 5-1 SECTION V MAINTENANCE 5.1 INTRODUCTION This section contains test and alignment procedures for an operational BK Radio DMH APCO Pr

Maintenance DMH Series VHF Radio Page 5-2 BK RADIO C. Chassis Inspect the chassis for deformation, dents, punctures, badly worn surfaces, damaged co

BK RADIO Specifications are subject to change without notice. Page 1-1 SECTION I GENERAL INFORMATION 1.1 INTRODUCTION This manual contains informatio

DMH Series VHF Radio Maintenance BK RADIO Page 5-3 L. Terminal Connections Soldered 1. Inspect for cold-soldered or resin joints. These joints pre

Maintenance DMH Series VHF Radio Page 5-4 BK RADIO 5.4 DISASSEMBLY & ASSEMBLY The DMH radio has three major assemblies which contain the follow

DMH Series VHF Radio Maintenance BK RADIO Page 5-5 5.4.2.1 CONTROL BOARD 1. Pull off the two rotary knobs from the front of the radio and remove

Maintenance DMH Series VHF Radio Page 5-6 BK RADIO 5.4.3 CORE ASSEMBLY 5.4.3.1 VCO AND RX/TX BOARDS 1. Remove the sheet metal shield from the RX

DMH Series VHF Radio Maintenance BK RADIO Page 5-7 5.4.4 PA ASSEMBLY A. Using a 7/16" deepwell socket, remove the hex nut from the antenna con

Maintenance DMH Series VHF Radio Page 5-8 BK RADIO A. Synthesizer Calibration This calibration records the required VCO pretuning voltage across

DMH Series VHF Radio Maintenance BK RADIO Page 5-9 To set up for this procedure, connect a suitable 50Ω power meter to the antenna output of the rad

BK RADIO Page 6-1 SECTION VI ILLUSTRATED PARTS LIST 6.1 INTRODUCTION This section helps you identify parts used in BK Radio’s DMH Series mobile radi

Illustrated Parts List DMH Series VHF Radio Page 6-2 Final Assembly – Dash Mount BK RADIO Table 6-1. Replacement Parts, Final Assembly - Dash Mount

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-1 Final Assembly – Dash Mount Page 6-3 J.E. Villanueva

General Information DMH Series VHF Radio Page 1-2 Specifications are subject to change without notice. BK RADIO 1.3 TECHNICAL CHARACTERISTICS FREQU

DMH Series VHF Radio Illustrated Parts List BK RADIO Final Assembly – Remote Mount RF Unit Page 6-5 Table 6-2. Replacement Parts, Final Assembly –

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-2 Final Assembly – Remote Mount RF Unit Page 6-7

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-3 Interconnect Diagram – Dash Mount Page 6-9

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-4 Interconnect Diagram – Remote Mount Page 6-11

DMH Series VHF Radio Illustrated Parts List BK RADIO Control Head Assembly – Dash Mount Page 6-13 Table 6-3. Replacement Parts, Control Head Assemb

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-5 Control Head Assembly – Dash Mount Page 6-15 J.E. Villanueva

DMH Series VHF Radio Illustrated Parts List BK RADIO Control Head Assembly – Remote Mount Page 6-17 Table 6-4. Replacement Parts, Control Head Asse

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-6 Control Head Assembly – Remote Mount Page 6-19

DMH Series VHF Radio Illustrated Parts List BK RADIO Control Board Page 6-21 Table 6-5. Replacement Parts, Control Board (309-648, Rev. C) Item Re

Illustrated Parts List DMH Series VHF Radio Page 6-22 Control Board BK RADIO Item Reference Number Part Number Description C125 1570-03101-163

DMH Series VHF Radio General Information BK RADIO Specifications are subject to change without notice. Page 1-3 TRANSMITTER 25 / 30 kHz 12.5 / 15

DMH Series VHF Radio Illustrated Parts List BK RADIO Control Board Page 6-23 Item Reference Number Part Number Description Q101 4823-3

Illustrated Parts List DMH Series VHF Radio Page 6-24 Control Board BK RADIO Item Reference Number Part Number Description R131 4734-01000-311

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-7.1 Control Board (309-648, Rev C) Page 6-25 [Sheet 1 – Top Side] J.E. Villanueva

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-7.2 Control Board (309-648, Rev C) Page 6-27 [Sheet 1 – Top Side] J.E. Villanueva

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-8.1 Control Board Schematic Page 6-29 [Sheet 1]

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-8.2 Control Board Schematic Page 6-31 [Sheet 2]

DMH Series VHF Radio Illustrated Parts List BK RADIO Options Board – Dash Mount Page 6-33 Table 6-6. Replacement Parts, Options Board (309-577 Rev.

Illustrated Parts List DMH Series VHF Radio Page 6-34 Options Board – Dash Mount BK RADIO Item Reference Number Part Number Description C31 157

DMH Series VHF Radio Illustrated Parts List BK RADIO Options Board – Dash Mount Page 6-35 Item Reference Number Part Number Description L2 1812

Illustrated Parts List DMH Series VHF Radio Page 6-36 Options Board – Dash Mount BK RADIO Item Reference Number Part Number Description R31 473

BK RADIO Page 2-1 SECTION II INSTALLATION AND PROGRAMMING 2.1 GENERAL INFORMATION This section contains information concerning the installation and

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-9.1 Options Board (309-577, Rev. C) – Dash Mount Page 6-37 [Sheet 1- Top Side] J.E.

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-9.2 Options Board (309-577, Rev. C) – Dash Mount Page 6-39 [Sheet 2- Bottom Side] J

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-10 Options Board Schematic – Dash Mount Page 6-41

DMH Series VHF Radio Illustrated Parts List BK RADIO Options Board – Remote Mount Page 6-43 Table 6-7. Replacement Parts, Options Board – Remote M

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-11 Options Board- Remote Mount Page 6-45

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-12 Options Board Schematic – Remote Mount Page 6-47

DMH Series VHF Radio Illustrated Parts List BK RADIO Switch Board Page 6-49 Table 6-8 Replacement Parts, Switch Board (607-006 Rev. D) Item Refer

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-13 Switch Board (607-006, Rev. D) Page 6-51 J.E. Villanueva-R.K. ENGRJ.S.-L940022J.D

DMH Series VHF Radio Illustrated Parts List BK RADIO Figure 6-14 Switch Board Schematic Page 6-53

DMH Series VHF Radio Illustrated Parts List BK RADIO Core Assembly Page 6-55 Table 6-9 Replacement Parts, Core Assembly Item Reference Number Part