GPH-CMD PORTABLE RADIO Service Manual
TABLE OF CONTENTS SECTION I GENERAL INFORMATION 1.1 1.2 1.3 INTRODUCTION .......................................................................................................................... 1-1 DESCRIPTION ............................................................................................................................. 1-1 TECHNICAL CHARACTERISTICS .............................................................................................. 1-2 ACCESSORIES ................................
General Information GPH-CMD VHF Radio SECTION III OPERATION 3.1 3.1.1 3.2 3.2.1 3.2.2 3.2.3 3.2.4 3.2.5 3.3 3.4 3.5 3.5.1 3.5.2 3.6 3.6.1 3.6.2 3.7 3.7.1 3.7.2 3.7.3 3.8 3.8.1 3.9 3.9.1 3.10 3.10.1 3.10.2 3.10.3 3.10.4 3.10.5 3.10.6 3.11 3.11.1 3.11.2 3.11.3 3.11.4 3.11.5 3.11.6 3.12 3.13 3.13.1 3.13.2 3.13.3 3.13.4 3.13.5 3.13.6 INTRODUCTION .......................................................................................................................... 3-1 FEATURES ............................
GPH-CMD VHF Radio General Information 3.14 ALPHANUMERIC DISPLAY....................................................................................................... 3-18 3.14.1 DISPLAY BACKLIGHTING .................................................................................................. 3-19 3.14.2 CHANNEL AND GROUP LABELS ...................................................................................... 3-19 3.15 DEFINITIONS AND ACRONYMS ....................................................
General Information GPH-CMD VHF Radio 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 GPH-CMD radios. 1.2 DESCRIPTION The GPH-CMD 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.
GPH-CMD VHF Radio General Information TRANSMITTER 25 / 30 kHz 12.5 / 15 kHz RF OUTPUT POWER: SPURIOUS AND HARMONICS: MODULATION DEVIATION: FM HUM AND NOISE: FREQUENCY STABILITY: AUDIO DISTORTION: AUDIO RESPONSE (per EIA): 5/2 Watts 60 dB 5 kHz 50 dB ±2.5 PPM 3% +1 dB / -3 dB 5/2 Watts 60 dB 2.5 kHz 45 dB ±2.5 PPM 3% +1 dB / -3 dB MODULATION CHARACTERISTICS: 16K0F3E 11K0F3E 25 / 30 kHz 12.
SECTION II INSTALLATION AND PROGRAMMING 2.1 GENERAL INFORMATION This section contains information concerning the installation and programming of BK Radio GPHCMD 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. The claim should be promptly filed with the transportation company.
Installation and Programming 2.2 GPH-CMD VHF Radio HOW TO PROGRAM RADIOS You can program GPH-CMD radios in three different ways: A. BY KEYPAD A radio can be programmed with its keypad and a programming plug, LAA0701. That procedure is described in this section. B. BY CLONING You can transfer a radio’s programmed settings to another GPH-CMD or GPH radio by using a cloning cable, LAA0700. See “Cloning Radio Settings" in section 2.2.2. C.
GPH-CMD VHF Radio 2.2.1.1 Installation and Programming NAVIGATION 1 2 3 FCN 4 5 6 PRI 7 8 9 ENT * 0 # CLR When Programming Mode is entered, programming starts (after password entry) with the Group Parameters (CH 00) for the currently selected group. To edit another Channel Group (GRP 01 - 25), press and hold the [#] key at any CH prompt to get the group selection prompt. Enter the number of the group to be programmed, or press the [PRI] key to increment to the desired group.
Installation and Programming 2.2.1.2 GPH-CMD VHF Radio GROUP PARAMETERS (CH 00) Press the [FCN] key at the CH 00 prompt to access group parameters. 2.2.1.2.1 GROUP OPTIONS: 1-12345678 This is a group of eight individual options that can be enabled or disabled. When an option is enabled, the corresponding number in the display will flash. When the option is disabled the number is steady.
GPH-CMD VHF Radio Installation and Programming Keys 0 and 1 can be used to enter the following characters: 0: 0, space, –, _, ., *, + 1: 1, <, >, /, \, |, $, %, h Press the [ENT] key to store changes and go back to the starting point for Channel 0 settings. 2.2.1.3 CHANNEL PARAMETERS (CH 01 – CH 20) At the starting point for Channel 0, the display shows ‘PROG CH 00’. At this point, a channel number can now be entered to allow access to the frequencies and Code Guard values for that channel. 2.2.1.3.
Installation and Programming GPH-CMD VHF Radio the [ENT] key to store the Code Guard value and automatically advance to the next field. 2.2.1.3.4 TRANSMIT FREQUENCY After the RX GUARD is set, the ‘TX FREQUENCY’ field appears. This is the transmitter frequency for Channel 1. PROG TX 148.00000 Tx frequency If it is correct, press the [FCN] key to advance to the next field.
GPH-CMD VHF Radio Installation and Programming At the starting point for Channel 1, the display will show ‘PROG CH 01’. Press the number keys for another channel number to gain access to the frequencies and Code Guard values for that channel. Each channel is then programmed using the same steps described for Channel 1. 2.2.1.4 GLOBAL PARAMETERS (GRP 00) PROG Grp 00 At any ‘CH’ prompt, press and hold the [#] key to get the ‘GRP’ prompt. Press ‘0’ on the keypad. The display will show ‘GRP 00’.
Installation and Programming GPH-CMD VHF Radio OPTION 4: PRIORITY 1 LOCK PROG 1-12345678 GBL OPTIONS When Option 4 is enabled (flashing) the user will not be able to change the designation of the Priority 1 Channel by selecting a channel and pressing the [PRI] key. When Option 4 is disabled (steady) the user will be able to change the channel that is designated as Priority 1 Channel. See "Dual Priority Scan" on page 3-12.
GPH-CMD VHF Radio Installation and Programming 2.2.1.4.3 PROG 2-12345678 GBL options GLOBAL OPTIONS TWO: 2-12345678 After the first group of Global Options is set, a second group is displayed. OPTION 1: RESERVED FOR FUTURE OPTIONS OPTIONS 2 & 3: BUSY CHANNEL OPERATION PROG 2-12345678 GBL options Busy Channel Off Options two and three are used to set Busy Channel operation. There are three types of busy channel operation available. They are described more fully under "Busy Channel" on page 3-16.
Installation and Programming GPH-CMD VHF Radio OPTIONS 6 – 8: RESERVED FOR FUTURE OPTIONS Once each option is set as desired, you can store the changes, discard the changes, or disable all displayed options. Press the [CLR] key to disable all displayed options (steady). Press the [ENT] key to store new displayed options settings into memory and advance to the next field. Press the [FCN] key to advance to the next field without saving changes. 2.2.1.4.
GPH-CMD VHF Radio Installation and Programming 2.2.1.4.6 PROG SCAN DELAY TIME After the Time-Out Timer is set, the ‘SCAN DELAY’ time is displayed. SCN 2.0 sec scan delay 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. Press the [CLR] key to reset the scan delay time to 0. Press the [ENT] key to store the changed setting and advance to the next field.
Installation and Programming GPH-CMD VHF Radio Press the [PRI] key to cycle through the priority channel options. Setting the channel to MAIN ties the PR1 channel to the Channel Selector knob. Press the [ENT] key to store the new priority channel and advance to the next field. 2.2.1.4.9 PROG GROUP 01 PRI-1 GROUP PRIORITY 1 GROUP If the Priority 1 channel has been programmed as one of the 500 channels in the radio, the group where the channel resides must be designated.
GPH-CMD VHF Radio Installation and Programming 2.2.1.4.12 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 Main No Off B Fixed Channel # No Off C Fixed Channel # Yes Off See “Priority Scan” in section 3.11 of this manual for operational details of the Old-Style BK Priority Scan Modes. 2.2.1.4.
Installation and Programming GPH-CMD VHF Radio When receiving an incoming clone from a GPH radio, the GPH-CMD radio ignores group data other than the group label and the group scan list bit. The GPH-CMD’s global data and channels 17-20 are not disturbed. Master Clone NOTE: Some groups may be “locked” by PC programming to prevent them from being overwritten. Only “unlocked” groups will accept incoming clones. 1. Make sure the battery packs for both radios are charged. 2.
GPH-CMD VHF Radio Installation and Programming 9. Once the target and data to be transferred have been selected, press the [FCN] key on the Master radio keypad. The top line of the display will flash ‘CLONING’ while the program in the master is being downloaded to the clone. CLONING Group 01 10. If the download was successful, the display on the Master will again display the clone prompt (target and data to be transferred). • To clone another channel group, press the Master radio’s [CLR] key.
Installation and Programming 2.3 GPH-CMD VHF Radio TONE CODE GUARD VALUES The Tone Code 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.
SECTION III OPERATION 3.1 INTRODUCTION This section contains information concerning the operation procedures for the BK Radio GPHCMD radios. The GPH-CMD radio has been designed to meet the tough requirements of today’s communications environment. Please take a moment to read the information in this manual so you can get optimum performance from your new radio. 3.1.1 3.
Operation 3.2.1 GPH-CMD VHF Radio RF ENERGY EXPOSURE AWARENESS AND CONTROL INFORMATION, OPERATIONAL INSTRUCTIONS FOR FCC OCCUPATIONAL USE REQUIREMENTS AND BEFORE USING YOUR PORTABLE 2-WAY RADIO, READ THIS IMPORTANT RF ENERGY AWARENESS AND CONTROL INFORMATION AND OPERATIONAL INSTRUCTIONS TO ENSURE COMPLIANCE WITH THE FCC’S RF EXPOSURE GUIDELINES.
GPH-CMD VHF Radio 3.2.3 Operation 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% transmitting and is authorized by the FCC for occupational use only.
Operation GPH-CMD VHF Radio Operating Instructions: • Transmit no more than the rated duty factor of 50% of the time. To transmit (talk), push the Push-To-Talk (PTT) button. To receive calls, release the PTT button. Transmitting 50% of the time, or less, is important because this radio generates measurable RF energy exposure only when transmitting (in terms of measuring for standards compliance).
GPH-CMD VHF Radio 3.
Operation 3.5 GPH-CMD VHF Radio BASIC OPERATION 3.5.1 RECEIVE Turn power on by turning the Volume knob clockwise. A beep sounds, indicating the radio is operational. The LCD display shows the current channel. Select a channel by rotating the Channel Selector knob. When the unstopped channel selector is rotated past the highest (20th) channel, the radio will emit a beep and remain on the highest channel.
GPH-CMD VHF Radio 3.6 Operation CODE GUARD OPERATION Code Guard™ allows one radio or a group of radios to be selectively called within a system. If the radio has been programmed with Code Guard, use the following receive and transmit instructions. 3.6.1 CODE GUARD RECEIVE Turn power on by turning the Volume knob clockwise. Select a Code Guard channel by turning the Channel Selector knob. Adjust volume by turning the Squelch knob clockwise until a noise is heard. Set the volume to a comfortable level.
Operation GPH-CMD VHF Radio 3.7.1 BUILDING A COMMAND GROUP 1 2 3 FCN 4 5 6 PRI 7 8 9 ENT * 0 # CLR CMND CHAN 5 After adding a channel, the display momentarily shows ‘CMND CHAN XX’ where XX is the channel number (1 – 20). Parameters associated with each selected channel, such as Bandwidth, Scan, and Power settings, are also used while operating in the Command Group.
GPH-CMD VHF Radio 3.8 Operation CHANNEL GROUPS Channels are arranged in 25 groups of up to 20 channels. 3.8.1 SELECT A GROUP/CHANNEL The rotary knob selects channels in the group selected by the keypad: 1 2 3 FCN 4 5 6 PRI 7 8 9 ENT * 0 # CLR 1. Press the [#] key on the keypad to display the current group number. 2. Press number keys for the new group number, or press [#] again to select the Command Group.
Operation GPH-CMD VHF Radio 3.9.1 KEYPAD LOCK To lock/unlock the keypad, press and hold the [FCN] key. When locked, “LOCKED” will be displayed if a key is pressed and a low beep will sound. LOCKED LOCKOUT EXCEPTIONS: PTT unlocks the keypad during transmit for enabled DTMF key presses. 3.10 SCAN OPERATION 1. Slide Switch B (scan) up. 2. Slide Switch C (priority) down. The display indicates scan operation by flashing SCN.
GPH-CMD VHF Radio 3.10.3 Operation TRANSMIT WITH SCAN ON When Switch B (scan) is up, the radio transmits on the channel selected by the Channel Selector knob unless Talkback Scan is enabled or “Transmit on Priority-1” is enabled (see Priority Scan operation). 1. Select a transmit channel by turning the Channel Selector knob. 2. Press and hold the PTT switch and talk in a normal voice.
Operation GPH-CMD VHF Radio 3.11 PRIORITY SCAN Priority Scan enables the radio to receive on any channel while monitoring for a message on the designated priority channel(s). The radio samples each priority channel at a preset rate (.25-2.0 seconds) regardless of activity on any other channel. Priority Scan operates only while the radio is not transmitting and can be used in combination with scan operation. 3 When Switch C (Priority) is up, the display flashes SCN.
GPH-CMD VHF Radio 3.11.2 Operation OLD-STYLE BK PRIORITY SCAN The radio can be programmed with one of three Priority Modes: A, B, or C. The table below shows how the priority channels and the transmit channels are selected in each mode. 3.11.3 Mode A Mode B Mode C Priority Channel Channel Knob Preset Preset Transmit Channel Channel Knob Channel Knob Priority Channel PRIORITY MODE A WITH SCAN In Priority Mode A, the priority channel is set by the Channel Selector knob.
Operation GPH-CMD VHF Radio To reply to a message on the priority channel, use the keypad to change groups if necessary, turn the Channel Knob to select the priority channel, and then transmit. Once activity has ceased on the priority channel, the radio returns to scan operation. 3.11.5 PRIORITY MODE C With Switch C (priority) up and Switch B (scan) down, the radio samples the fixed priority channel at the preset rate.
GPH-CMD VHF Radio Operation 3.12 USER TRANSMIT CODE GUARD When the radio is being programmed with transmit and receive frequencies for each channel, a receive Code Guard value and a transmit Code Guard value can also be assigned to each channel. On channels that do not have a default transmit Code Guard programmed, the user can choose CxCSSs from a global UTXG Pick List containing 32 entries.
Operation GPH-CMD VHF Radio 3.13.2 HI/LO POWER Each channel in the radio can be individually programmed to always transmit in Low-Power Mode, regardless of the position of the radio's top switch (or keypad [FCN] menu setting). If the programming for the channel allows highpower transmissions, the power level can be selected with a top switch or the keypad menu. 3.13.
GPH-CMD VHF Radio 3.13.6.1 Operation BUSY CHANNEL INDICATION The yellow Busy Channel Indicator glows if there is carrier activity on the selected channel. If the selected channel is a Code Guard channel and the proper Code Guard value is not detected, the Busy Channel Indicator remains on for the duration of the carrier activity and no message is heard. During Scan and Priority Scan operation, the Busy Channel Indicator glows when activity is detected on any channel on the Scan List.
Operation GPH-CMD VHF Radio 3.14 ALPHANUMERIC DISPLAY GPH-CMD radios may optionally have a slide-out keypad/display cover. To remove or install the cover, turn off the radio and remove the battery (see Battery Installation and Removal, section 2.1.2 of this manual).
GPH-CMD VHF Radio Operation GPH-CMD Series portable radios can be programmed with the following features: 3.14.1 DISPLAY BACKLIGHTING The GPH-CMD radios can be programmed by your dealer to backlight the display when a signal is received or when a key is pressed. The time duration of the backlighting can also be programmed. 3.14.2 CHANNEL AND GROUP LABELS The radio can be programmed with a label for each of the 25 channel groups and a label for each of the 20 channels within each group.
Operation GPH-CMD VHF Radio 3.15 DEFINITIONS AND ACRONYMS ANI CG CLR Cloning Automatic Numeric Identification Code Guard Clear The process of copying data from one radio, called “master,” to other radios, called “slaves” or “clones.” Code Guard A sub-audible tone for selective calling and receiving. Command A group of up to 20 channels selected by the user Group from any of the 500 channels in the radio. Detent The click/hesitation you feel as you turn a knob from one position to another.
SECTION IV THEORY OF OPERATION 4.1 INTRODUCTION This section contains the theory of operation for the BK Radio GPH-CMD radio. To help you understand the operation of the equipment, refer to the schematic diagrams in Section VI of this manual. 4.2 DESCRIPTION The GPH-CMD radios are self-contained VHF FM Radios covering the frequency range of 136 MHz to 174MHz. The radios are multi-channel and digitally synthesized using a single crystal for frequency control.
Theory of Operation GPH-CMD VHF Radio RF signals from the Front End enter a Mixer that converts them to 16.9 MHz. The 16.9 MHz IF signal passes through two crystal filters that provide adjacent channel selectivity. The IF amplifier then amplifies the signal and couples it to the 455 kHz IF integrated circuit. The 455 kHz IF IC consists of a Mixer, limiter, demodulator, and squelch circuit. The 16.9 MHz signal enters the Mixer and is converted to a 455 kHz IF signal.
GPH-CMD VHF Radio E. Theory of Operation FM IF IC The FM IF IC provides a second Mixer, a high-gain limiter, a demodulator, an OP-AMP, and a Schmitt trigger. The Mixer converts the 16.9 MHz signal to 455 kHz. The local oscillator for the Mixer consists of a 17.355 MHz crystal and associated circuitry. The 455 kHz signal is filtered by a ceramic filter. A limiter provides most of the gain for the Receiver. The FM signal is demodulated by the demodulator, the ceramic discriminator, and associated circuitry.
Theory of Operation A. GPH-CMD VHF Radio Power Amplifier The Power Amplifier comprises two RF amplifier stages (see Figure 4-3 below). These are: (1) Driver (2) Integrated Power Module Power Control L.O. Input (from VCO) Q1 Driver Stage U4 To Harmonic Filter Power Module Figure 4-3 Power Amplifier Block Diagram The Driver stage provides gain and isolation between the VCO and the Integrated Power Module.
GPH-CMD VHF Radio Theory of Operation In Transmit Mode, both pin diodes in the Antenna Switch are turned on, completing a signal path from the Transmitter and shunting the Receiver path to ground. In Receive Mode, both pin diodes are turned off, allowing RF signals to flow to the Receiver with the Transmitter output port removed from the circuit. D. Power Control Circuit The Power Control Circuit monitors the DC supply current to the Integrated Power Module.
Theory of Operation A. GPH-CMD VHF Radio Voltage Controlled Oscillator (VCO) Transistor Q4 provides the gain, and an L-C resonant tank circuit provides the frequency selectivity and phase shift necessary to produce an oscillator. Frequency control of the oscillator is accomplished by the tuning tank circuit comprised of mechanically adjustable transformer T1 and varactors CR4 and CR5. The cathode of CR4, connected to the Loop Filter, is used to lock the VCO to the desired carrier frequency.
GPH-CMD VHF Radio G. Theory of Operation VCO Coarse Tune Adaptive Filter R26 and C50 form a low cutoff frequency pole to filter out noise on the Coarse Tune line to the VCO. When changing to a new frequency that requires a different Coarse Tune voltage, switch U11 is closed for a short time to allow the voltage on C50 to change to the new value rapidly. H. 3.0V Regulator U12 provides a low noise regulated 3.
Theory of Operation D. GPH-CMD VHF Radio Front End Tuning and Power Set D/A converter U2 and amplifier U10-B allow the Microprocessor to set the Front End Tuning voltage in Receive Mode and the Power Set voltage in Transmit Mode to any value in the range of 0V to -15V. E. 3.3V Regulator U14 provides a regulated 3.3V supply for the Microprocessor and other digital circuitry in the radio. F. 5V Regulator U8 provides a regulated 5V supply for the Receiver and other analog circuitry in the radio. G. 7.
GPH-CMD VHF Radio 4.3.5 Theory of Operation DIGITAL SIGNAL PROCESSING 3.3 V REGULATOR SWITCHING A + (1.4 MHz SW FREQ) 3.3 V LINEAR 1.8 V REGULATOR TCXO 1.8 V 19.6608 MHz TX AUDIO 9.8304 MHz CLK SPEAKER AUDIO CODEC DATA DSP ADRS DATA FLASH MEMORY DATA COTROL CONTROL MIC CONTROL / COTROL DATA BUS/ DISC AUDIO DATA BUS TO CORE uP Figure 4-6 Digital Signal Processing Block Diagram A.
SECTION V MAINTENANCE 5.1 INTRODUCTION This maintenance section contains test and alignment procedures for an operational BK Radio GPH-CMD radio. This section also contains troubleshooting and assembly/disassembly procedures. An understanding of the theory of operation is recommended before maintenance is attempted. All LAA kits and programming items are available from BK Radio. 5.2 TEST EQUIPMENT REQUIRED A. RF Signal Generator: HP8640B or equivalent B. Distortion Analyzer: HP334A or equivalent C.
Maintenance GPH-CMD VHF Radio 5.3 OVERHAUL 5.3.1 ACCESSORIES This section contains instructions to assist in determining, by inspection, the condition of GPHCMD assemblies. Defects resulting from wear, physical damage, deterioration, or other causes can be found by these inspection procedures. A. Capacitors, Fixed Inspect capacitors for case damage, body damage, and cracked, broken or charred insulation. Check for loose, broken, or corroded terminal studs, lugs, or leads.
GPH-CMD VHF Radio I. Maintenance Insulators Inspect insulators for evidence of damage, such as broken or chipped edges, burned areas and presence of foreign matter. J. Jacks Inspect all jacks for corrosion, rust, deformations, loose or broken parts, cracked insulation, bad contacts, or other irregularities. K. Potentiometers Inspect all potentiometers for evidence of damage or loose terminals, cracked insulation, or other irregularities. L.
Maintenance 5.3.3 GPH-CMD VHF Radio REPAIR This section describes the procedure along with any special techniques for replacing damaged or defective components. A. Connectors When replacing a connector, refer to the appropriate PC board assembly drawing and follow the notes to ensure correct mounting and mating of each connector. B. Crystal The use of any other than a BK Radio crystal is considered an unauthorized modification. C.
GPH-CMD VHF Radio B. Maintenance Options Board and Keyboard 1. Disconnect the zero insertion force connector J10 from the Options board by sliding the connector sleeve toward the top of the radio. This allows the flex cable to be unplugged. 2. Remove the five screws that secure the Options board to the keyboard and the front cover, and unplug the keyboard. C. RX/TX Board 1. Unfasten the three retaining clip screws that secure the RX/TX board to the main frame. 2.
Maintenance 5.5 GPH-CMD VHF Radio ALIGNMENT PROCEDURES The GPH-CMD radio uses manual alignment for receiver front end tuning, receiver IF alignment and VCO adjustment. Electronic tuning is provided for all other adjustments. You will need the GPH-CMD Editor Software and programming cable, available from BK Radio. Refer to the GPHCMD Editor Help file for more complete details on using the program. 5.5.
GPH-CMD VHF Radio A. Maintenance VCO Adjustment The frequency range of the VCO must be tuned. If components in the VCO are replaced this adjustment may be necessary. As the inductance value of the VCO resonator is manually tuned, the synthesizer U12 (Systems board) changes the voltage applied to varactor CR4 (Systems board) to maintain the programmed frequency. Connect a suitable 50Ω RF load to the antenna output of the radio.
Maintenance D. GPH-CMD VHF Radio VCO Modulation Sensitivity This adjustment controls the maximum analog and digital mode FM deviation of the transmitter. If components in the VCO or Transmit Audio amplifier or filter are changed this adjustment may be necessary to maintain an FM deviation below 5 kHz (2.5 kHz for narrowband or digital mode). The level of the Transmit Modulation is controlled using a digital potentiometer U18 (Systems board).
GPH-CMD VHF Radio F. Maintenance Receiver Front End Tuning Bandpass filters in the receiver front end are manually tuned to optimize reception at 136 MHz. If components in the bandpass filters, RF amplifier, or mixer are replaced this adjustment may be necessary to maintain specified RF sensitivity. As the inductors of the bandpass filters are manually tuned, the passband is aligned with the incoming RF carrier, optimizing sensitivity. To perform the adjustment: 1.
Maintenance H. GPH-CMD VHF Radio Squelch 1. Squelch adjustment is a semi-automated process that must be performed in both wideband and narrowband. The squelch adjustment is controlled using a digital potentiometer U18 (Systems board). 2. Wideband Mode With preset squelch (monitor/squelch control fully counterclockwise) the GPH-CMD audio should turn on at approximately 8 dB SINAD. If components in the IF filter or squelch filter are replaced, adjustment of the squelch may be necessary.
GPH-CMD VHF Radio Maintenance RF POWER METER 50 OHM LOAD / RF POWER METER Figure 5-1 Transmitter Test Setup BK RADIO Page 5-11
Maintenance GPH-CMD VHF Radio ADJUSTS VCO NOTE: For clarity, the top lid of the shield is not shown. The access hole to T1 is covered with copper tape that is removed only for servicing purposes. The tape must be replaced after the adjustments are made.
GPH-CMD VHF Radio Maintenance Figure 5-3 Receiver Test Setup BK RADIO Page 5-13
Maintenance GPH-CMD VHF Radio ADJUSTS SENSITIVITY (FRONT-END TUNING) ADJUSTS AUDIO FOR LOWEST DISTORTION Figure 5-4 RX/TX Board Adjustments Page 5-14 BK RADIO
GPH-CMD VHF Radio 5.
Maintenance 5.6 GPH-CMD VHF Radio TROUBLESHOOTING (cont.) Transmitter Audio Modulation Is Too High Audio Output Power Does Not Meet Specification -Transmit Analog or Digital Deviation misadjusted -VCO modulation circuit failing -Audio power amplifier failing -FM demodulator IC failing Radio Always Gives Low Battery Indication ("LOBATT" Message Displayed) -Failing or shorted 8.
SECTION VI ILLUSTRATED PARTS LIST 6.1 INTRODUCTION This section helps you identify parts used in BK Radio’s GPH-CMD radios. 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), Schematic Diagram and Parts Placement. Parts itemized in the various lists meet BK Radio’s design specifications and are the recommended replacement parts. 6.
Illustrated Parts List GPH-CMD VHF Radio Table 6-1.
GPH-CM D VHF Radio BK RADIO Illustrated Parts List Figure 6-1 Final Assembly (Dwg. No. 0008-30932-800 Rev.
GPH-CMD VHF Radio Illustrated Parts List 4 3 2 1 ZONE LTR A REVISION DRAWN BY: CHK BY: APPRD. BY: EN: J. E. Villanueva M. Dohaney J. E.
GPH-CMD VHF Radio Illustrated Parts List Table 6-2.
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-3 System Frame Assembly (Dwg. No. 0008-30932-900 Rev.
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-4 System Frame Assembly – Additional Notes (Dwg No. 0008-30933-000 Rev.
GPH-CMD VHF Radio Illustrated Parts List Table 6-3. Replacement Parts, Control Board (505-662 Rev. E) Item Reference Number Part Number Between PCB and S2,S3,&S4 1411-40004-300 1700-50566-200 2105-20031-703 2800-20027-400 Switch,Spacer,Molded,EP Bd,Pc,Cont,GPH Conn,Hdr,Rt_Angle,3_Pin Spacer,Switch 3101-00000-018 Tubing,Clear,Teflon,22GA 4810-20009-302 5111-30942-501 5114-20004-300 Di,LED,Yel.
GPH-CMD VHF Radio Illustrated Parts List 4 3 2 ZONE 1 REVISION LTR DRAWN BY: CHK BY: C J.E. Villanueva E J.E. Villanueva APPRD. BY: EN: J. Delaby - DATE: BY-504 J. E. VillanuevaBY-623 01-02 03-20-03 D D C C VIEWED FROM BOTTOM VIEWED FROM TOP 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.
Illustrated Parts List GPH GPH-CMD D C BY-720 BY-692 BY-503 0315 05 1108 04 GPH-CMD VHF Radio BK RADIO Figure 6-6 Control Board Schematic Page 6-17 D
GPH-CMD VHF Radio Illustrated Parts List Table 6-4 Replacement Parts, System Board 5W (309-610 Rev.
Illustrated Parts List GPH-CMD VHF Radio Item Reference Number Part Number C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C80 C82 C83 C84 C85 C86 C87 C88 C89 C90 C91 C92 C93 C94 C95 C96 C97 C98 C99 C100 C101 C102 C103 C104 C105 C106 1570-00103-273 1552-60463-129 1570-03102-271 1572-00105-734 1570-00102-163 1570-00102-163 1570-03102-271 1570-03103-261 1570-00102-163 1570-03509-113 1570-00102-163 1570-00473-273 1570-03102-271 1570-00102-163
GPH-CMD VHF Radio Illustrated Parts List Item Reference Number Part Number C107 C108 C109 C110 C111 C112 C113 C114 C115 C116 C117 1570-02106-778 1570-03150-163 1570-03150-163 1570-03103-261 1570-00104-272 1570-00102-163 1570-00102-163 1570-03101-263 1570-03470-163 1570-03470-163 1570-03470-163 Cap,CP,10uF,X5R,10%,1206 Cap,CP,15pF,NPO,5%,50V,0402 Cap,CP,15pF,NPO,5%,50V,0402 Cap,Cp,.01uF,5%,X7R,16V,0402 Cap,Cp,.1uF,10%,X7R,25V,0603 Cap,CP,1.0nF,5%,COG,50V,0603, Cap,CP,1.
Illustrated Parts List GPH-CMD VHF Radio Item Reference Number Part Number Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q18 Q19 Q21 Q23 Q25 4823-20046-700 4823-10367-900 4823-30562-201 4823-10367-900 4823-30741-401 4823-20046-700 4823-20046-700 4823-30680-105 4823-30669-001 4823-30680-102 4823-30680-102 4823-30680-102 4823-30939-201 4823-30680-104 4823-30680-102 4823-30680-010 4823-30680-105 4823-50483-200 4823-30939-201 4823-30939-201 Xstr,PMosfet,Sm_Sig,SOT23 Xstr,NPN,RF_Sm_Sig,SOT23, Xstr,RF
GPH-CMD VHF Radio Illustrated Parts List Item Reference Number Part Number R35 R36 R37 R38 R39 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R50 R51 R52 R53 R54 R55 R56 R57 R58 R59 R60 R61 R62 R63 R64 R65 R66 R67 R68 R69 R70 R71 R72 R73 R74 R75 R76 R77 R78 R79 R80 R81 R83 R84 R85 R86 R87 R88 R89 4734-01000-311 4734-02001-311 4734-05112-311 4734-03571-311 4734-01502-311 4734-01001-311 4734-04322-311 4734-01212-311 4734-01001-311 4734-01001-311 4734-01001-311 4734-01001-311 4734-01001-311 4734-01001-311 4734-0
Illustrated Parts List GPH-CMD VHF Radio Item Reference Number Part Number R90 R91 R92 R93 R94 R95 R96 R97 R98 R99 R100 R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 R111 R112 R113 R114 R115 R116 R117 R118 R119 R120 R121 R122 R123 R124 R125 R126 R127 R128 R129 R130 R131 R132 R133 R134 R135 R136 R137 R138 R139 R140 R141 R142 4734-01001-311 4734-01001-311 4734-01003-311 4734-01004-311 4734-00335-331 4734-05113-311 4734-01001-311 4724-00332-233 4734-01001-311 4734-01001-311 4734-01001-311 4734-01000-3
GPH-CMD VHF Radio Illustrated Parts List Item Reference Number Part Number T1 1800-20012-701 Ind,RF_Xfmr,11/4T,100MHz,Can, U1 U2 U3 U4 U5 U6 U7 U8 U9 U10 U11 U12 U13 U14 U15 U16 3134-20082-400 3134-30940-810 3134-30670-409 3134-30950-501 3134-30950-402 3134-30577-404 3134-30747-819 3134-30670-403 3134-30927-201 3134-30670-413 3134-30906-202 3134-30950-304 3134-30950-304 3134-30670-403 3134-30911-002 3134-20083-001 IC,MCU,QFB IC,DUAL,DAC IC,OPA,SO8, IC,P-Ch,30V,S0-8 IC,DC/DC,Invert,SOT23-5 IC,Freq_S
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-7 System Board (309-610 Rev. A) (Dwg. No. 8888-30961-000 Rev.
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-8 System Board Schematic (309-610 Rev.
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-9 System Board Schematic (309-610 Rev.
GPH-CMD VHF Radio Illustrated Parts List Table 6-5 Replacement Parts, Top Frame Assembly Item Reference Number Part Number Description ITM 1 ITM 2 ITM 3 ITM 4 ITM 5 ITM 6 ITM 7 ITM 8 ITM 9 ITM 11 ITM 12 ITM 13 ITM 15 ITM 18 ITM 19 ITM 20 ITM 21 ITM 22 ITM 23 ITM 24 1700-40011-000 2883-20035-500 3110-20032-600 5112-40010-900 1411-40005-500 1411-50703-000 1411-40005-900 2820-30603-022 2858-40007-700 1411-50702-104 2801-30714-512 3110-20032-500 2512-40011-200 1403-50704-302 3101-00000-018 6024-00000-001
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-10 Top Frame Assembly (Dwg. No. 0008-30933-200 Rev.
GPH-CMD VHF Radio Illustrated Parts List Table 6-6 Replacement Parts, RX/TX Frame Assembly Item Reference Number ITM1 ITM2 ITM3 ITM4 ITM5 ITM6 BK RADIO Part Number 1403-40008-701 2801-30714-510 5400-60705-100 1601-20007-102 5400-30961-901 2803-30668-136 Description Chassis,Sulframe,Stl,EP, Scr,MS,2-56,X3/16,T1CR,FH100,SS,PS, Heatsink,Chromate, Only Tape,Mylar,.
GPH-CMD VHF Radio Illustrated Parts List 4 3 2 1 ZONE LTR A REVISION DRAWN BY: J.E. Villanueva CHK BY: APPRD. BY: EN: J. E. Villanueva - DATE: FR 06-29-04 FORMAL RELEASE IN ACAD 14 TAPE - 0.80" LONG APPLIED TO BACK CORNER OF HEATSINK 4 D D 5 ASSY 1 3 C C 2 3 REQ'D 6 NOTES: 1. DO NOT SOLDER ITEM 1 TO ASSEMBLY 1 UNTIL FINAL ASSEMBLY, UNLESS A FIXTURE IS USED. 2. PARTS COMMON TO ALL ASSEMBLIES UNLESS OTHERWISE NOTED IN B O M. 3. NOT USED IN GPH 2WATT ASSEMBLIES.
GPH-CMD VHF Radio Illustrated Parts List Table 6-7.
Illustrated Parts List GPH-CMD VHF Radio Item Reference Number Part Number C46 C47 C48 C49 C50 C54 C55 C56 C67 C68 C69 C70 C71 C72 C73 C74 C76 C77 C78 C82 C83 C94 C95 C96 C97 C98 C99 C100 C107 C108 C109 C110 1570-00223-273 1570-00684-777 1570-00102-163 1570-00102-163 1570-00104-272 1570-00102-163 1552-60463-156 1570-00102-163 1573-02689-133 1573-02689-133 1573-02100-163 1573-02399-133 1573-02120-163 1573-02109-123 1573-02689-133 1570-00560-163 1570-00102-163 1552-60463-113 1570-00103-273 1570-00103-273
GPH-CMD VHF Radio Illustrated Parts List Item Reference Number Part Number CR4 CR5 CR6 CR7 CR8 CR9 CR10 CR11 CR12 CR13 CR14 CR15 CR20 4824-30572-501 4824-20008-600 4824-20008-600 4824-20008-600 4824-20008-600 4824-30572-501 4824-30572-501 4824-30572-501 4824-30572-501 4824-20047-300 4824-30541-303 4824-30541-303 4824-30572-501 Di,Var. Di,Schottky,SOT-23, Di,Schottky,SOT-23, Di,Schottky,SOT-23, Di,Schottky,SOT-23, Di,Var. Di,Var. Di,Var. Di,Var.
Illustrated Parts List GPH-CMD VHF Radio Item Reference Number Part Number R1 R2 R3 R4 R5 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R26 R27 R29 R30 R31 R36 R37 R38 R39 R43 R44 R45 R46 R51 R52 R53 R65 R66 R81 R82 R83 R84 R89 R90 R91 R92 R93 R94 R95 R96 R97 4732-00334-531 4732-00680-531 4724-00000-009 4732-00124-531 4732-00124-531 4732-00222-531 4724-00560-233 4732-00181-531 4732-00124-531 4732-00124-531 4732-00103-531 4728-00019-945 4724-03922-213 4724-00222-233 4732-00151-531 47
GPH-CMD VHF Radio Illustrated Parts List Item Reference Number Part Number R98 R100 R101 R102 R103 4732-00104-531 4732-01743-511 4724-04123-213 4732-00101-531 4732-00101-531 Res,CP,100K,5%,1/16W,0603 Res,Cp,174K,1%,1/16W,0603 Res,Cp,412K,1%,1/10W,0805 Res,Cp,100,5%,1/16W,0603, Res,Cp,100,5%,1/16W,0603, S1 2508-20029-701 Shield,30/12.
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-12 RX/TX Board 5 Watt (309-609 Rev B) Page 6-47
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-13 RX/TX Board 5 Watt Schematic [Sheet 1] Page 6-49
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-14 RX/TX Board 5 Watt Schematic [Sheet 2] Page 6-51
GPH-CMD VHF Radio Illustrated Parts List Table 6-8.
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-15 Front Cover Assembly Page 6-55
GPH-CMD VHF Radio Illustrated Parts List Table 6-9 Replacement Parts, Options Board (309-620 Rev.
Illustrated Parts List GPH-CMD VHF Radio Item Reference Number Part Number J94 J95 J96 J97 J98 2108-20002-501 2108-20002-501 2108-20002-501 2108-20002-501 2108-20002-501 Socket,Mini,Spring, Socket,Mini,Spring, Socket,Mini,Spring, Socket,Mini,Spring, Socket,Mini,Spring, P7 P8 2105-20035-706 2105-20035-705 CONN_.025 SQUARE,6PIN Conn.Square,5_Pin,.
GPH-CMD VHF Radio Illustrated Parts List Item Reference Number Part Number U1 U2 U3 U4 U5 U6 U7 U8 U9 3134-30949-710 3134-30949-800 3134-30949-900 3134-30950-000 3134-30950-400 3134-30950-305 3134-30960-100 3134-30950-600 3134-30950-601 IC,DSP IC, Flash Mem, IC,Quad 2-Input,Pos-NAND, IC, 16 Bit A/D & 16 Bit D/A, IC,Sw,Reg,3.3V,SOT-23 IC,REG,1.5V,150mA,LDO, IC,Uni-Direct,Xlator, IC,T_Logic,ULP,D_Flp/Flp IC,T_Logic,ULP Y1 2390-30957-100 TCXO, 19.
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-16 Options Board (309-620 Rev.
GPH-CMD VHF Radio BK RADIO Illustrated Parts List Figure 6-17 Options Board Schematic Page 6-63
GPH-CMD VHF Radio Illustrated Parts List Table 6-10 Replacement Parts, Keyboard/Display Assembly Item Reference Number Item Item Item Item Item 1 2 3 4 5 BK RADIO Part Number 2001-30959-701 2003-30964-300 1411-30959-600 2816-30434-012 2512-20034-101 Description KEYBOARD, SILICONE LCD/Keyboard Assembly Insert Assembly,Black Scr,2-28x.
GPH-CMD VHF Radio Illustrated Parts List J.E.
GPH-CMD VHF Radio BK RADIO Integrated Circuit Data Page A-1
Integrated Circuit Data Page A-2 GPH-CMD VHF Radio BK RADIO
GPH-CMD VHF Radio BK RADIO Integrated Circuit Data Page A-3
Integrated Circuit Data Page A-4 GPH-CMD VHF Radio BK RADIO
GPH-CMD VHF Radio BK RADIO Integrated Circuit Data Page A-5
Integrated Circuit Data Page A-6 GPH-CMD VHF Radio BK RADIO
GPH-CMD VHF Radio BK RADIO Integrated Circuit Data Page A-7
Integrated Circuit Data Page A-8 GPH-CMD VHF Radio BK RADIO
GPH-CMD VHF Radio BK RADIO Integrated Circuit Data Page A-9
Integrated Circuit Data Page A-10 GPH-CMD VHF Radio BK RADIO
GPH-CMD VHF Radio BK RADIO Integrated Circuit Data Page A-11
Integrated Circuit Data Page A-12 GPH-CMD VHF Radio BK RADIO
GPH-CMD VHF Radio BK RADIO Integrated Circuit Data Page A-13
Integrated Circuit Data Page A-14 GPH-CMD VHF Radio BK RADIO
GPH-CMD VHF Radio BK RADIO Integrated Circuit Data Page A-15
Integrated Circuit Data Page A-16 GPH-CMD VHF Radio BK RADIO
GPH-CMD VHF Radio BK RADIO Integrated Circuit Data Page A-17
Integrated Circuit Data Page A-18 GPH-CMD VHF Radio BK RADIO
