BK Radio GPH-CMD Service Manual Download Page 53

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GPH-CMD VHF Radio

Theory of Operation

BK RADIO

Page 4-9

4.3.5 DIGITAL SIGNAL PROCESSING

Figure 4-6 Digital Signal Processing Block Diagram

Digital Signal Processor

The Digital Signal Processor implements filters, tone generators, and other signal processing
algorithms required for operation.

B. Flash

Memory

The Flash Memory stores the Digital Signal Processor software.

C. CODEC

Converts analog signals to digital signals and vice versa.

D. TCXO

Provides a stable oscillator frequency for Digital Signal Processor.

E. Voltage

Regulators

3.3 Volts is provided by a switching regulator. A linear regulator produces 1.5 Volts.

DSP

CODEC

FLASH

MEMORY

TO CORE

TCXO

19.6608 MHz

LINEAR

1.8 V

REGULATOR

(1.4 MHz SW FREQ)

9.8304 MHz

CLK

DATA

SPEAKER

TX AUDIO

DISC

MIC

ADRS

DATA

COTROL

COTROL /

DATA BUS

AUDIO

1.8 V

3.3 V

A +

3.3 V

REGULATOR

SWITCHING

AUDIO

CONTROL

DATA

BUS

Summary of Contents for GPH-CMD

Page 1: ...GPH CMD PORTABLE RADIO Service Manual ...

Page 2: ... 3 1 CHANNEL BANDWIDTH 2 5 2 2 1 3 2 RECEIVE FREQUENCY 2 5 2 2 1 3 3 RECEIVE GUARD 2 5 2 2 1 3 4 TRANSMIT FREQUENCY 2 6 2 2 1 3 5 TRANSMIT GUARD 2 6 2 2 1 3 6 CHANNEL LABEL 2 6 2 2 1 4 GLOBAL PARAMETERS GRP 00 2 7 2 2 1 4 1 KEYPAD PROGRAMMING PASSWORD 2 7 2 2 1 4 2 GLOBAL OPTIONS ONE 1 12345678 2 7 2 2 1 4 3 GLOBAL OPTIONS TWO 2 12345678 2 9 2 2 1 4 4 AUTOMATIC NUMERIC IDENTIFICATION ANI 2 10 2 2 ...

Page 3: ... 3 7 3 MODIFICATION OF THE COMMAND GROUP 3 8 3 8 CHANNEL GROUPS 3 9 3 8 1 SELECT A GROUP CHANNEL 3 9 3 9 PROGRAMMABLE TOP SWITCHES FUNCTION MENU 3 9 3 9 1 KEYPAD LOCK 3 10 3 10 SCAN OPERATION 3 10 3 10 1 SCAN CODE GUARD CHANNELS 3 10 3 10 2 NUISANCE CHANNEL DELETE 3 10 3 10 3 TRANSMIT WITH SCAN ON 3 11 3 10 4 TALKBACK SCAN 3 11 3 10 5 CHANGE THE SCAN LIST 3 11 3 10 6 GROUP SCAN 3 11 3 11 PRIORITY ...

Page 4: ...FIGURE 4 2 TRANSMITTER BLOCK DIAGRAM 4 3 FIGURE 4 3 POWER AMPLIFIER BLOCK DIAGRAM 4 4 FIGURE 4 4 ANTENNA SWITCH FUNCTIONAL BLOCK DIAGRAM 4 4 FIGURE 4 5 SYNTHESIZER BLOCK DIAGRAM 4 5 FIGURE 4 6 DIGITAL SIGNAL PROCESSING BLOCK DIAGRAM 4 9 SECTION V MAINTENANCE 5 1 INTRODUCTION 5 1 5 2 TEST EQUIPMENT REQUIRED 5 1 5 3 OVERHAUL 5 2 5 3 1 ACCESSORIES 5 2 5 3 2 CLEANING 5 3 5 3 3 REPAIR 5 4 5 4 DISASSEMB...

Page 5: ...2 PARTS LIST DESCRIPTION 6 1 6 3 ASSEMBLY DRAWING SYMBOLS 6 1 FINAL ASSEMBLY 6 2 INTERCONNECT DIAGRAM 6 5 SYSTEM FRAME ASSEMBLY 6 7 CONTROL BOARD 505 662 6 13 SYSTEMS BOARD 309 610 6 19 TOP FRAME ASSEMBLY 6 33 RX TX FRAME ASSEMBLY 6 37 RX TX BOARD 5 WATT 309 609 6 41 FRONT COVER ASSEMBLY 6 53 OPTIONS BOARD 309 620 6 57 KEYBOARD DISPLAY ASSEMBLY 6 65 APPENDIX A A 1 ...

Page 6: ...ized using a single crystal for frequency control All models incorporate an EEPROM for the storage of data such as channel frequencies Code Guards and channel labels All models also include low battery and busy channel indicators Toggle switches can be programmed to control hi low transmit power channel scan priority scan repeater talk around and group scan Status and channel information is displa...

Page 7: ...tal Code Guard CDCSS Interstitial Frequency Capability Nuisance Channel Delete TalkBack Scan CHANNELS 500 25 groups of 20 channels OPERATING TEMPERATURE 30 to 60 C PHYSICAL DIMENSIONS Weight 20 oz 24 oz with large battery 0 6 kilograms 0 7 kg with large battery Width 2 55 in 64 8 millimeters Depth 1 5 in 38 1 mm Height 6 6 in 167 6 mm 7 8 in 198 1 mm with large battery ANTENNA TYPE Helical wound m...

Page 8: ...se only BK Radio approved supplied or replacement antennas batteries and accessories Use of non BK Radio approved antennas batteries and accessories may exceed the FCC RF exposure guidelines For a list of BK Radio approved accessories visit the following website http www relm com License Requirements This equipment must be licensed by the Federal Communications Commission FCC before it may be used...

Page 9: ...y packs are shipped uncharged or only partially charged Therefore a rechargeable battery pack should be properly charged before use B To install the battery locate the center hub on the radio base and place it in the recess of the battery pack Position the pack approximately at a 30 offset seating two metal studs in their recess Apply upward pressure to the pack while twisting the pack to its fina...

Page 10: ...sh button master switch will be on the top NOTE The cloning cable can be used as a substitute for the programming plug by inserting the end with the push button master switch into the side connector of the radio 2 Select a channel group to be programmed See Channel Groups in section 3 8 of this manual 3 Press and hold the master switch 4 While holding the master switch press and hold the FCN key A...

Page 11: ... or press the PRI key to increment to the desired channel Press the FCN key repeatedly to cycle through the data fields and then loop back to the CH entry point CHANNEL PARAMETERS CH 01 20 include Bandwidth key at CH prompt toggles Wide Narrow RX Frequency RX CxCSS TX Frequency TX CxCSS Channel Label To edit global data GRP 00 press and hold the key at any CH prompt to get the group selection prom...

Page 12: ...dvance to the next field without saving changes 2 2 1 2 2 GROUP LABEL After Group Options the display will show the label for the Channel Group Each Channel Group can have a label of up to twelve characters or spaces The characters can include 0 9 A Z h or blank If no change is needed press the FCN key to go back to the starting point for Channel 0 settings NOTE Special software available from BK ...

Page 13: ...d This is the receive frequency for channel 1 in MHz If the displayed frequency is correct press the FCN key to advance to the next field If a new frequency is desired press the CLR key followed by the digits of the desired frequency Then press the ENT key to store this frequency and automatically advance to the next field 2 2 1 3 3 RECEIVE GUARD After the RX FREQUENCY is set the RX GUARD field ap...

Page 14: ...t the display to 0 0 Press the number keys to enter a Tone Code Guard value See Tone Code Guard Values in section 2 3 To enter Digital Code Guard first press the CLR key then the key causing the letter D to appear followed by three zeros Enter the desired digital code using keys 0 thru 7 keys 8 9 do not respond See Digital Code Guard Values in section 2 4 Pressing the PRI key after the three digit...

Page 15: ... When the Option is disabled the number is steady If you wish to change the Option from enabled to disabled or vice versa press the number key corresponding to that Option EXAMPLE If Option 4 Priority 1 Lock is disabled the 4 in the display will not be flashing If the 4 key is pressed the 4 in the display will flash signifying that Priority 1 Lock is enabled A subsequent press of the 4 key will di...

Page 16: ... TX and SCN annunciators The display will not illuminate if Backlight Duration is set to LITE OFF See Backlight Duration in section 2 2 1 4 7 below OPTION 7 BACKLIGHT ON KEY PRESS When 0ption 7 is enabled flashing the display backlight will illuminate each time a key is pressed even if pressing the key has no other effect The display will not illuminate if backlight duration is set to LITE OFF See...

Page 17: ...etent To set Busy Channel operation use the following chart Busy Channel Option 2 Option 3 Indication Disable Steady Enable Flashing Lockout Enable Flashing Enable Flashing Override Enable Flashing Disable Steady OPTIONS 4 5 ANI DTMF MODE When Option 4 is enabled flashing the ANI ID number will be transmitted as a DTMF tone sequence with each press of the PTT switch See Automatic Numeric Identific...

Page 18: ...he ID number press the FCN key to advance to the next field A new number can be entered by pressing number keys The digits will appear at the right of display and move to the left Press the ENT key to store the new ID number and advance to the next section The existing ID number can be incremented one digit by pressing the PRI key Press the ENT key to store the new ID number and advance to the nex...

Page 19: ...ight duration to zero and display LITE OFF Press the PRI key to increase backlight duration by 1 second increments from LITE OFF to 1 SEC ON 2 3 4 5 6 SEC ON LITE ON illumination remains on constantly then back to LITE OFF Press the ENT key to store changes and advance to the next field Press the FCN key to advance to the next field without storing changes 2 2 1 4 8 PRIORITY 1 CHANNEL After Backli...

Page 20: ... the Priority 2 Channel is displayed Any one of the 500 channels in the radios can be designated as the Priority 2 channel or PR2 can be tied to the Channel Selector knob or programmed OFF The PR2 channel cannot be altered during normal radio operation Press the PRI key to cycle through the priority channel options Setting the channel to MAIN ties the PR2 channel to the Channel Selector knob Press...

Page 21: ... 2 2 2 CLONING RADIO SETTINGS Any Master radio a GPH CMD with the desired radio frequencies and settings is capable of transferring its program to another GPH CMD or GPH radio The radio receiving the program is referred to as the Slave or Clone The LAA0700 cloning cable will be required in the following procedure Data that can be cloned to another GPH CMD radio includes Group data Command Group da...

Page 22: ...Connect the other plug of the cable to the side connector of the radio you want to clone 6 Turn on the clone and set it to the desired channel group 7 Press the key on the Master radio keypad The radio will respond showing the prompt PROG GPHCMD on the first line and Group XX on the second line where XX is the currently selected group see Select A Group Channel section 3 8 of this manual for detai...

Page 23: ... CLR key Navigate to a CH prompt then press and hold the key to get the GRP prompt If cloning is finished turn off the Clone and disconnect the cloning cable Normal radio operation will occur when you turn on the Clone 11 If the download was not successful the master will flash FAILURE and multiple beeps will follow Failure of downloading can be due to Improper connection Failure to turn on the cl...

Page 24: ...5 4Z 146 2 4B 156 7 5A 167 9 6Z 179 9 6B 192 8 7A 210 7 M2 225 7 M4 241 8 74 4 79 7 85 4 YA 91 5 ZZ 50 60 Hz power distribution systems could cause falsing The assignments in a given area shall be made from within one of the Groups A B or C 2 4 DIGITAL CODE GUARD VALUES Codes for the Digital Code Guard system may be chosen from the following list This can be done during the code programming of the...

Page 25: ...izable Command Group User Selectable TX Code Guard DTMF ANI Transmit Time Out Timer Group Scan Scan Delay Talkback Scan Nuisance Channel Delete Dual Priority Scan with Code Guard Alphanumeric Display Up to 500 Channels Available in 25 Groups of 20 Channels 2 5 kHz Interstitial Frequency Capability Keypad Lock 3 2 FCC REQUIREMENTS Your radio must be properly licensed by the Federal Communications C...

Page 26: ...zations to develop standards for exposure to RF energy These standards provide recommended levels of RF exposure for both workers and the general public These recommended RF exposure levels include substantial margins of protection All 2 way radios marketed in North America are designed manufactured and tested to ensure they meet government established RF exposure levels In addition manufacturers ...

Page 27: ...tional RF exposure limits and may operate at duty factors of up to 50 talk Your BK Radio 2 way radio complies with the following RF energy exposure standards and guidelines United States Federal Communications Commission Code of Federal Regulations 47 CFR 1 1307 1 1310 2 1091 and 2 1093 American National Standards Institute ANSI Institute of Electrical and Electronic Engineers IEEE C95 1 1992 Inst...

Page 28: ...cturer s non approved accessories may result in exposure levels which exceed the FCC s occupational controlled environment RF exposure limits If you are not using a body worn accessory and are not using the radio in the intended use position in front of the face then ensure the antenna and the radio are kept at least one inch 2 5 cm from the body when transmitting Keeping the radio at the proper d...

Page 29: ...ICROPHONE LCD DISPLAY CHANNEL SELECT ON OFF VOLUME SQUELCH CODE GUARD G R P PRG TX RX SCNID CG DPH RADIO WITH KEYBOARD DISPLAY COVERED OR NOT INSTALLED REDUCED VIEW BK RADIO CG OFF SQ VOL 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 A B C KEYBOARD GPH CMD RADIO WITH KEYPAD DISPLAY COVERED REDUCED VIEW SQUELCH CODE GUARD HI LO ANTENNA TRANSMIT INDICATOR SCAN PRIORITY PROG TX RX SCN ID CG CMND home channe...

Page 30: ...t the detent places the receiver in Code Guard A message will be heard only when the proper Code Guard value is received 3 5 2 TRANSMIT Press the PTT Push To Talk switch When the transmitter is on the red Transmit Indicator glows and TX appears in the display Talk in a normal voice with the microphone one to two inches from your mouth Release the PTT switch to stop transmitting If the Transmit Ind...

Page 31: ...E GUARD TRANSMIT Turn the Squelch knob on clockwise and monitor the Code Guard channel before transmitting or if Busy Channel operation is enabled check the yellow LED NOTE Do not transmit if the channel is busy Press the PTT switch When the transmitter is on the red Transmit Indicator glows and TX appears in the display If monitoring the channel reset the squelch knob to the Code Guard position t...

Page 32: ...OMMAND GROUP The Command Group can be entered by pressing the key twice Operation in the Command Group is indicated on the display by the CMND icon Adding or deleting a channel to from the Command Group s scan list also changes the channel s status in its home group It is not valid for a priority channel to be set to a channel in the Command Group If while operating in the Command Group the PRI ke...

Page 33: ...The following functions can be assigned to the three top switches or the keypad FCN key menu FUNCTION FCN Key Menu Label Low Power Select TX LOW POWER Channel Scan CHANNEL SCAN Priority Scan PRI SCAN Repeater Talk Around TALK AROUND Group Scan GROUP SCAN Your dealer can also assign more than one function to the same top switch For example both low power select and RTA could be enabled by the same ...

Page 34: ...eived 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 10 1 SCAN CODE GUARD CHANNELS 1 Slide Switch B scan up 2 Turn the Squelch knob completely counterclockwise past the detent to the Code Guard position When a signal is detected scanning stops while the radio ...

Page 35: ...also on and your radio is programmed to always transmit on the Priority 1 channel 3 10 5 CHANGE THE SCAN LIST If the radio has not been programmed for Scan List Lock the user may add or remove channels from the Scan List If user changes are enabled follow these steps to change the Scan List 1 Slide Switches B scan and C priority down 2 Select a channel to be added or removed from the Scan List by ...

Page 36: ...nnel the radio receiver locks on to the priority channel and checks to see if the proper Code Guard value is present If the signal contains the proper Code 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 11 1 DUAL PRIORITY SCAN Up to two of the radio s 500 channels can be designated as priority chan...

Page 37: ...uration of the message The display shows the priority channel To reply to a message on the priority channel press the PTT switch and the radio will transmit on the priority channel Once activity ceases on the priority channel the radio returns to scan operation 3 11 4 PRIORITY MODE B With Switch C priority up and Switch B scan down the radio can receive on the knob selected channel while sampling ...

Page 38: ...he priority channel the radio overrides the active scan channel changes to the priority channel and holds for the duration of the transmission To reply to a message on the priority channel press the PTT switch The radio transmits only on the priority channel when Switch C priority is up Once activity has ceased on the priority channel the radio returns to scan operation 3 11 6 CHANGE THE PRIORITY ...

Page 39: ...DXXX Press PRI to increment through the list or key in a number Press ENT to exit the list viewer This feature is for viewing the list only Pressing ENT when a list item is displayed does NOT associate the UTXG with the selected channel Programming of the list if programming is not locked out by PC software can be accomplished as follows 1 While viewing the list press and hold the FCN key until th...

Page 40: ...ly 3 13 4 ANI ENCODING ANI encoding Automatic Numeric Identification if enabled transmits a sequence of DTMF tones each time you press the PTT switch You will hear a sidetone Your dealer can program the ANI number to be sent If DTMF and ANI are both enabled the ANI tone sequence is transmitted only after the ENT key is pressed while the PTT switch is activated You will hear a sidetone 3 13 5 TIME ...

Page 41: ...hannel Lockout feature applies only to those channels programmed with a receive Code Guard value When carrier activity is detected on the channel selected the radio checks the receive Code Guard value If the proper Code Guard value is present the radio can transmit on that channel even if the Squelch knob is in the Code Guard position If the radio detects an incorrect value or carrier activity onl...

Page 42: ...this manual Display annunciators indicate the following information ALPHANUMERIC INDICATION PR Priority Channel PROG 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 ID Programming Mode Automatic Numeric Identification ANI CG Programming Mode Code Guard CMND Command Group Active FIGURE 3 1 ...

Page 43: ...n 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 To display a group label turn scanning functions off then 1 Press the key on the keypad to display the group number 2 Press and hold the key to display the group label 3 Press the ENT key or...

Page 44: ...es Tones that sound like those used by a standard push button telephone ENT Enter FCN Function Individual Personality The information programmed with a PC on both a global and by channel basis that tells the radio exactly how to operate LCD Liquid Crystal Display PROG Program PRI Priority PTT Push To Talk RTA Repeater Talk Around RTX Channel Ready to Transmit Channel RX Receive SCN Scan SQ Squelch...

Page 45: ...PH CMD Series radio comprises five major circuits The RECEIVER which consists of RF Preselectors RF Preamplifier Mixer IF Filters IF Amplifiers FM IF IC and Noise Squelch circuitry The TRANSMITTER which consists of a Power Amplifier Harmonic Filter Antenna Switch and Power Control circuitry The SYNTHESIZER which consists of a Voltage Controlled Oscillator VCO VCO Buffer Synthesizer Buffer Synthesi...

Page 46: ...iltered audio noise is used to provide a squelch indication Figure 4 1 Receiver Block Diagram A RF Preselectors The Preselectors provide greater than 75 dB of attenuation at the image frequency Both bandpass filters are varactor tuned which allows a wide frequency spread Overall the preselectors exhibit a bandwidth of 4 5 MHz The preselectors consist of L2 L3 L4 L5 and associated circuitry B RF Pr...

Page 47: ... gain is controlled by the Microprocessor The squelch noise is detected by the internal Schmitt trigger of the FM IF IC The Microprocessor samples the Schmitt trigger output to determine signal level and squelch information 4 3 2 TRANSMITTER The Transmitter consists of four major blocks see figure below A Power Amplifier B Harmonic Filter C Antenna Switch D Power Control Circuit Figure 4 2 Transmi...

Page 48: ...Integrated Power Module provides sufficient RF power to meet the radio s output power specification after losses in the Harmonic Filter and Antenna Switch The DC current into the Integrated Power Module is monitored by the Power Control circuit B Harmonic Filter The Harmonic Filter attenuates the harmonics created by the Power Amplifier to meet or exceed the transmit spurious and harmonic specific...

Page 49: ...veloped across this resistance is fed to a bridge circuit and amplifier where it is compared to the PWR SET voltage Any difference in the levels is amplified and used to control the bias current to the Integrated Power Module 4 3 3 SYNTHESIZER The Synthesizer generates an RF signal either to down convert a desired receive frequency to a fixed IF or to drive the Transmitter The synthesizer is essen...

Page 50: ...VCO D Synthesizer IC Synthesizer chip U6 contains a 5 bit integer reference divider and a main divider controlled by an 18 bit delta sigma modulator The delta sigma fractional N capability permits very fine frequency resolution while using a very high phase detector sample rate The charge pump phase detector provides current pulses at the sample rate whose polarity and width are proportional to th...

Page 51: ...sor if the battery voltage falls too low for proper operation of this regulator A 15V switching regulator generates the negative supply needed to produce the negative VCO Coarse Tune and Receiver Front End Tune Transmitter Power Set signals Several special Transmitter features are implemented by the Microprocessor These include Repeater Talk Around Busy Channel Lockout DTMF Control ANI Control Sub...

Page 52: ...15V switching regulator Q25 is used to switch the regulator off during Battery Saver Mode I Receive Audio U9 is a 0 5 Watt Audio amplifier Muting is controlled by the Microprocessor The audio level out of U9 is controlled by the analog potentiometer connected to the Volume Knob R51 J Deviation Compensation The transmit Deviation Compensation is accomplished by one of the two digital potentiometers...

Page 53: ...he Digital Signal Processor software C CODEC Converts analog signals to digital signals and vice versa D TCXO Provides a stable oscillator frequency for Digital Signal Processor E Voltage Regulators 3 3 Volts is provided by a switching regulator A linear regulator produces 1 5 Volts DSP CODEC FLASH MEMORY TO CORE TCXO 19 6608 MHz uP LINEAR 1 8 V REGULATOR 1 4 MHz SW FREQ 9 8304 MHz CLK DATA DATA S...

Page 54: ...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 RF Voltmeter optional Boonton 92C or equivalent D RF Power Meter HP435B with 30 dB pad or equivalent E Service Monitor HP8920A Service Monitor or equivalent F Digital Multimeter Fluke 8012A or equivalent G Computer IBM PC or Compatible with an RS 23...

Page 55: ...es loose or missing hardware component corrosion and damage to the finish D Coils Inspect all coils for broken leads loose mountings and loose improperly soldered or broken terminal connections Check for crushed scratched cut or charred windings Inspect the windings leads terminals and connections for corrosion or physical damage Check for physical damage to forms and tuning slug adjustment screws...

Page 56: ...for excess solder protrusions from the joint pieces adhering to adjacent insulation and particles lodged between joints conductors or other components 3 Inspect for insufficient solder and unsoldered strands of wire protruding from conductor at the terminal Check for insulation that is stripped back too far from the terminal 4 Inspect for corrosion at the terminal N Wiring Coaxial Cable Inspect wi...

Page 57: ...ldering instructions E Wiring Coaxial Cable When repairing a wire that has broken from its terminal remove all old solder and pieces of wire from the terminal restrip the wire to the necessary length and resolder the wire to the terminal Replace a damaged wire or coax with one of the same type size and length 5 4 DISASSEMBLY ASSEMBLY 5 4 1 BATTERY REMOVAL To remove the battery pack turn the radio ...

Page 58: ...d D Synthesizer and VCO Remove the screw and unsolder the five tabs that secure the Synthesizer shield to the Systems board Remove the shield halves from both sides of the Systems board E Top Plate and Switch Board 1 Remove the channel select volume and the squelch knobs 2 Remove the retaining fasteners from the channel select switch volume control and the squelch control 3 Remove the bezel and in...

Page 59: ...ff any radio features assigned to the keypad function menu and set the manual controls as follows Channel Selector Channel 1 Channel Group Group 1 On Off Volume On volume minimum Monitor Squelch Unsquelched fully clockwise Radio Top Switches Off Toward front of radio Refer to Figures 5 1 and 5 3 for Transmitter and Receiver Test Setup These figures show the interface between test equipment and the...

Page 60: ...tored in non volatile memory Connect a suitable 50Ω power meter to the antenna output of the radio Follow the instructions for Transmit Power Adjustment in the GPH CMD Editor Software Check the power at low 136 MHz mid 155 MHz and high 174 MHz frequencies If any high power reading is below 5 Watts readjust to obtain 5 Watts If any low power reading is below 2 Watts readjust to obtain 2 Watts C Ref...

Page 61: ...to optimize receiver distortion If components in the mixer or IF circuitry are replaced this adjustment may be necessary to maintain specified receiver distortion As the transformers are manually tuned the IF filter passband shape is affected To perform the adjustment 1 Program 136 MHz receive frequency wideband 25 30 kHz mode Turn the monitor squelch control fully clockwise Adjust the volume cont...

Page 62: ...dpass filters in the receiver front end are electronically tuned to optimize reception above 136 MHz The tuning is customized using the receiver front end slope adjustment If components in the bandpass filters RF amplifier or mixer are replaced this adjustment may be necessary to maintain specified RF sensitivity Four varactors are used in the receiver front end bandpass filters The control voltag...

Page 63: ... the radio Modulate the generator with a 1 kHz tone at 3 kHz deviation c Connect a distortion analyzer to the radio speaker output d Adjust the RF signal generator level to obtain an 8 dB SINAD reading on the distortion analyzer e Follow the instructions for Receiver Front End in the GPH CMD Editor Software 3 Narrowband Mode This adjustment should always follow the wideband adjustment To perform t...

Page 64: ...GPH CMD VHF Radio Maintenance BK RADIO Page 5 11 Figure 5 1 Transmitter Test Setup 50 OHM LOAD RF POWER METER RFPOWER METER ...

Page 65: ...5 2 Systems Board Adjustments ADJUSTS VCO TOP SIDE 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 ...

Page 66: ...GPH CMD VHF Radio Maintenance BK RADIO Page 5 13 Figure 5 3 Receiver Test Setup ...

Page 67: ...Maintenance GPH CMD VHF Radio Page 5 14 BK RADIO Figure 5 4 RX TX Board Adjustments ADJUSTS SENSITIVITY FRONT END TUNING ADJUSTS AUDIO FOR LOWEST DISTORTION ...

Page 68: ...Harmonic filter failing Power amplifier failing Power control circuit failing Antenna switch failing VCO buffer failing Code Guard Signal Not Being Transmitted No Code Guard signal programmed on transmit channel Poor Battery Life Weak or defective battery Transmitter power adjusted too high Audio amplifier not switching off Radio Unmutes With No Carrier Present When In Preset Condition Internal sq...

Page 69: ...nal to synthesizer loop amplifier Transmitter Frequency Out Of 2 5 PPM Specification XTAL frequency misadjusted Failing temperature compensation circuit on Systems board Failing XTAL Audio Opening Without Receiving The Programmed Code Guard Monitor switch failing Monitor switch buffer Q8 on Systems board failing Insufficient Transmit Range Improper or defective antenna Open antenna jack Failing an...

Page 70: ...mblies are also listed by a part number helping you find the correct sub assembly parts Each part and Sub assembly has a 12 digit number that is unique Parts are usually identified by their schematic reference number or in the case of an assembly their item number 6 3 ASSEMBLY DRAWING SYMBOLS Several symbols are used in the Assembly Drawings One symbol helps to identify parts or items that are lis...

Page 71: ...NK HOLES EP GP_Portable ITM 9 2801 30714 510 Scr MS 2 56X 3 16 T1CR FH100 SS PS ITM 10 2820 20031 405 Screw M2 5X5 0 FHP ITM 11 2820 30603 017 Scr MS M2 5X 45X8 T1CR PH SS BLKOX ITM 12 2820 30603 019 Scr MS M2 5X 45X35 T1CR PH SS BLKOX ITM 13 2507 30923 801 Label 1 89 x0 79 Brady B428 Mtl_Poly ITM 14 1601 20033 303 Tape Copper ITM 15 2508 30904 302 Shield w Finish Modified ITM 16 2512 20033 900 Ga...

Page 72: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 1 Final Assembly Page 6 3 Dwg No 0008 30932 800 Rev D ...

Page 73: ...333 30962 000 KEYBOARD DISPLAY P98 P97 P96 P95 P91 P92 P93 P94 5V AO CLK DI GND CORE 3 3V KEYPAD CS J98 J97 J96 J95 J91 J92 J93 J94 SYSTEMS BOARD SCHEMATIC 3333 30961 001 P7 J7 P2 J2 P1 J1 RECEIVER TRANSMITTER BOARD SCHEMATIC 3333 30960 900 5 WATT 2 4 6 8 10 1 3 5 7 9 1 3 5 7 9 2 4 6 8 10 GND SQ NOISE PWR SET TUNE SW A NC RX 5 DPTT DISC AUDIO CAR PRES WIDE IF 1 2 3 GND LOCAL OSC GND 1 2 3 J15 EXT ...

Page 74: ...nob Vol Sq ITM 20 1405 30093 201 Chan Bezel Sw Molded 20 ITM 23 2402 50541 603 Knob Assy Channel Select W Blank Inlay ITM 24 6026 30315 803 Wire Strnd 26GA 250V Red Teflon ITM 26 7011 20238 900 EPH EPI Lower Lid Assembly ITM 27 7011 20238 800 EPH EPI Top Lid Assembly ITM 28 2832 30737 505 Scr 0 80X3 8 PHP ITM 31 1411 40005 400 Antenna Bushing Molded EP ITM 32 1411 40005 700 Antenna Nut Molded EP I...

Page 75: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 3 System Frame Assembly Page 6 9 Dwg No 0008 30932 900 Rev E ...

Page 76: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 4 System Frame Assembly Additional Notes Page 6 11 Dwg No 0008 30933 000 Rev B ...

Page 77: ... S4 1411 40004 300 Switch Spacer Molded EP 1700 50566 200 Bd Pc Cont GPH P11 P12 P13 2105 20031 703 Conn Hdr Rt_Angle 3_Pin Between Top frame and switches S2 S3 and S4 2800 20027 400 Spacer Switch 2 lengths 48 ea Insulate leads of CR1 3101 00000 018 Tubing Clear Teflon 22GA CR1 4810 20009 302 Di LED Yel S1 5111 30942 501 Switch Rotary 16 pos No Stop S2 S3 S4 5114 20004 300 Switch Toggle W15mm Lev ...

Page 78: ...D DIMENSIONS ARE IN INCHES AND INCLUDE APPLIED THIS DRAWING IS PROPERTY OF PRODUCTS WITHOUT PERMISSION REPRODUCED COPIED OR USED AS THE BASIS FOR MANUFACTURE OR SALE OF RELM COMMUNICATION AND SHALL NOT BE 2 PLACE DIM 3 PLACE DIM ANGLES SCREW THREADS AMERICAN NATIONAL CLASS PROJECTION THIRD ANGLE FINISH TOLERANCES CLASS TOLERANCES WEST MELBOURNE FL 32904 COMMUNICATIONS INC TM RELM DRAWING NO TITLE ...

Page 79: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 6 Control Board Schematic Page 6 17 BY 503 BY 692 11 08 04 C D GPH GPH CMD BY 720 D 15 03 05 ...

Page 80: ...0D 3216 C20 1570 02106 778 Cap CP 10uF X5R 10 1206 C21 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C22 1570 03100 123 Cap CP 10pF NPO 5pf 50V 0402 C23 1570 03109 113 Cap CP 1pF NPO 25pf 50V 0402 C24 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C25 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C26 1570 03159 113 Cap CP 1 5pF NPO 25pF 50V 0402 C27 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C28 1570 00102 ...

Page 81: ...54 778 Cap E 470UF 30 20 16V 85D 10X12 5mm C76 1570 00103 273 Cap CP 10nF 10 X7R 50V 0603 C77 1570 03102 271 Cap CP 1000pf 10 X7R 10V 0402 C78 1570 00223 273 Cap Cp 022uF X7R 10 50V 0603 C79 1570 00105 777 Cp Cap 1uF X5R 10 10V 0603 C80 1570 00223 273 Cap Cp 022uF X7R 10 50V 0603 C82 1570 03101 263 Cp Cap 100PF X7R 5 0402 C83 1570 03103 261 Cap Cp 01uF 5 X7R 16V 0402 C84 1570 03101 263 Cp Cap 100P...

Page 82: ...tching Dual SOT 23 CR7 4810 20009 303 Di LED Red FB1 2503 20022 300 Ferrite Bead Surfc Mt FB2 2503 20022 300 Ferrite Bead Surfc Mt FB3 2503 02102 410 Bead FB4 2503 02102 410 Bead FB5 2503 02102 410 Bead FB6 2503 02102 410 Bead FB7 2503 02102 410 Bead FB8 2503 02102 410 Bead FB9 2503 02121 505 Bead Fer FB10 2503 02102 410 Bead Ferrite FB11 2503 02121 505 Bead Fer FB12 2503 02121 505 Bead Fer FB13 2...

Page 83: ...W 0402 R5 4734 01001 311 Res CP 1 00K 1 1 16W 0402 R6 4734 01001 311 Res CP 1 00K 1 1 16W 0402 R7 4734 01001 311 Res CP 1 00K 1 1 16W 0402 R8 4734 01009 311 Res Cp 10_Ohms 1 16W 1 0402 R9 4734 01002 311 Res CP 10K 1 1 16W 0402 R10 4734 01009 311 Res Cp 10_Ohms 1 16W 1 0402 R11 4734 01009 311 Res Cp 10_Ohms 1 16W 1 0402 R12 4734 01009 311 Res Cp 10_Ohms 1 16W 1 0402 R13 4734 01009 311 Res Cp 10_Ohm...

Page 84: ...4734 02261 311 Res Cp 2 26K 1 1 16W 0402 R59 4734 02002 311 Res Cp 20K 1 1 16W 0402 R60 4734 01003 311 Res CP 100K 1 1 16W 0402 R61 4734 01003 311 Res CP 100K 1 1 16W 0402 R62 4734 02052 311 Res Cp 20 5k 1 16W 1 0402 R63 4734 05112 311 Res Cp 51 1K 1 1 16W 0402 R64 4734 01004 311 Res Cp 1M 1 1 16W 0402 R65 4734 04122 311 Res Cp 41 2K 1 1 16W 0402 R66 4734 03012 311 Res CP 30 1K 1 1 16W 0402 R67 47...

Page 85: ...3 4734 01003 311 Res CP 100K 1 1 16W 0402 R114 4734 02003 311 Res Cp 200K 1 1 16W 0402 R115 4734 01003 311 Res CP 100K 1 1 16W 0402 R116 4734 04992 311 Res Cp 49 9K 1 1 16W 0402 R117 4734 02492 311 Res Cp 24 9K 1 1 16W 0402 R118 4734 00000 008 Res Cp 0_Ohms Jumper 1 16W 1A 0402 R119 4734 01001 311 Res CP 1 00K 1 1 16W 0402 R120 4734 01001 311 Res CP 1 00K 1 1 16W 0402 R121 4734 01001 311 Res CP 1 ...

Page 86: ... 30V S0 8 U5 3134 30950 402 IC DC DC Invert SOT23 5 U6 3134 30577 404 IC Freq_Syn TSSOP U7 3134 30747 819 IC EEPROM 256K 2 5V SO8 U8 3134 30670 403 IC RGA SO8 U9 3134 30927 201 IC BTL_Audio_Amp 1W U10 3134 30670 413 IC OPA SO8 U11 3134 30906 202 IC SW SPST SOT23 6 U12 3134 30950 304 IC REG ADJ LDO SOT 23 U13 3134 30950 304 IC REG ADJ LDO SOT 23 U14 3134 30670 403 IC RGA SO8 U15 3134 30911 002 IC O...

Page 87: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 7 System Board 309 610 Rev A Page 6 27 Dwg No 8888 30961 000 Rev A ...

Page 88: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 8 System Board Schematic 309 610 Rev A Page 6 29 Sheet 1 ...

Page 89: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 9 System Board Schematic 309 610 Rev A Page 6 31 Sheet 2 ...

Page 90: ...40X6 T1CR PH SS ITM 9 2858 40007 700 Nut Blind Press ITM 11 1411 50702 104 Housing PTT GPH ITM 12 2801 30714 512 Scr MS 2 56 X5 16 T1CR FH100 SS BLKOX ITM 13 3110 20032 500 Insulatr Shim PTT HSG ITM 15 2512 40011 200 Gasket PTT ITM 18 1403 50704 302 Chassis Topframe w finish ITM 19 3101 00000 018 Tubing Clear Teflon 22GA ITM 20 6024 00000 001 Wire Buss 24GA Tin Copper ITM 21 6026 30315 808 Wire 26...

Page 91: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 10 Top Frame Assembly Page 6 35 Dwg No 0008 30933 200 Rev A ...

Page 92: ...me Assembly Item Reference Number Part Number Description ITM1 1403 40008 701 Chassis Sulframe Stl EP ITM2 2801 30714 510 Scr MS 2 56 X3 16 T1CR FH100 SS PS ITM3 5400 60705 100 Heatsink Chromate Only ITM4 1601 20007 102 Tape Mylar 250W ITM5 5400 30961 901 Adaptor Heatsink ITM6 2803 30668 136 Scr MS 4 40 x 5 32 H BHC SS ...

Page 93: ...DIMENSIONS 2 FINISH TOLERANCES THIRD ANGLE PROJECTION CLASS TOLERANCES 1 OF 1 COMMUNICATIONS INC WEST MELBOURNE FL 32904 NTS 1 DPHx 0008 30965 600 REV REFERENCE TM DRAWING NO SCALE SIZE B TITLE RX TX FRAME ASSEMBLY RELM SHEET A A B FORMAL RELEASE IN ACAD 14 CHK BY 2 ZONE LTR J E Villanueva A DRAWN BY C 06 29 04 REVISION J E Villanueva APPRD BY EN FR DATE 1 D 1 3 6 2 4 5 ASSY 1 NOTES 3 REQ D 1 DO N...

Page 94: ...69 133 Cap Cp 5 6pF S 0 25pF 250V 0603 C17 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C18 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C19 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C20 1570 00100 163 Cap CP 10pF 5 COG 50V 0603 C21 1553 50525 320 Cap Cp 39PF 10 NPO 50V 0805 C22 1553 50313 551 Cap Cp 8 2PF 25PF NPO 50V 0805 C24 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C25 1573 02270 163 Cp Cap 27pF...

Page 95: ...10 X7R 50V 0603 C83 1570 00103 273 Cap CP 10nF 10 X7R 50V 0603 C94 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C95 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C96 1570 00103 273 Cap CP 10nF 10 X7R 50V 0603 C97 1570 00103 273 Cap CP 10nF 10 X7R 50V 0603 C98 1570 00102 163 Cap CP 1 0nF 5 COG 50V 0603 C99 1570 00103 273 Cap CP 10nF 10 X7R 50V 0603 C100 1570 00103 273 Cap CP 10nF 10 X7R 50V 0603 C107 15...

Page 96: ...nd Cp 820nH 5 0805 L10 1812 82103 020 Ind Cp 820nH 5 0805 L21 1808 20013 630 Ind Fxd_Coil 1 5UH 7 9MHz SMD L24 1801 20023 310 Ind Fxd_AW_Coil 4T 24GA 0 133D Lft_Hnd L25 1801 20023 309 Ind Fxd_AW_Coil 5T 24GA 0 139D Lft_Hnd L26 1801 20023 308 Ind Fxd_AW_Coil 5T 24GA 0 136D Lft_Hnd L27 1800 20013 200 Ind RF_Xfmr P_8T S_4T 2_PRI 4T Can L28 1800 20048 300 Ind RF_Xfmr P_6T S_15T 16 9MHz Can L29 1800 20...

Page 97: ... Cp 1 62K 1 1 16W 0603 R27 4732 00181 531 Res CP 180 5 1 16W 0603 R29 4732 04023 511 Res Cp 402K 1 1 16W 0603 R30 4732 02211 511 Res Cp 2 21K 1 1 16W 0603 R31 4732 07682 511 Res Cp 76 8K 1 1 16W 0603 R36 4732 00300 531 Res Cp 30_Ohm 5 1 16W 0603 R37 4732 01132 511 Res Cp 11 3K 1 1 16W 0603 R38 4732 01103 511 Res Cp 110K 1 1 16W 0603 R39 4732 05112 511 Res Cp 51 1K 1 1 16W 0603 R43 4732 02001 511 R...

Page 98: ...16W 0603 S1 2508 20029 701 Shield 30 12 5_RT SHM EP U1 3134 30670 505 IC BAS SO14 U3 3134 50394 077 IC RFA SOT143 U4 3132 30595 002 IC RFA U5 3134 30911 003 IC OP_AMP R R SOT 23 U6 3134 30950 302 IC REG ADJ LDO 50ma SC70 U7 3134 30670 620 IC IF FM SSOP16 XF1 2705 20022 600 Fltr Xtal 16 9MHz XF2 2705 20022 600 Fltr Xtal 16 9MHz XF3 2705 20022 800 Fltr Xtal 16 9MHz XF4 2705 20022 800 Fltr Xtal 16 9M...

Page 99: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 12 RX TX Board 5 Watt 309 609 Rev B Page 6 47 ...

Page 100: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 13 RX TX Board 5 Watt Schematic Page 6 49 Sheet 1 ...

Page 101: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 14 RX TX Board 5 Watt Schematic Page 6 51 Sheet 2 ...

Page 102: ...e ITM 13 2813 20027 702 Standoff LPU MPU ITM 14 2801 00437 006 Scr MS 2 56 X7 16 P PH ST CAD ITM 15 2816 30434 007 Scr Plas 2 28 X9 32 P PH ST BLKOX ITM 17 2506 30968 201 Cover Blank Display Keyboard Optional ITM 17 2506 30968 202 Cover w Cut Outs Display Keryboard Optional ITM 17 2506 30968 301 Cover Blank Keyboard Optional ITM 17 2506 30968 302 Cover w Access Holes Keryboard Optional ITM 20 6026...

Page 103: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 15 Front Cover Assembly Page 6 55 ...

Page 104: ...100PF X7R 5 0402 C18 1570 03103 261 Cap Cp 01uF 5 X7R 16V 0402 C19 1570 03103 261 Cap Cp 01uF 5 X7R 16V 0402 C20 1570 03103 261 Cap Cp 01uF 5 X7R 16V 0402 C21 1570 03103 261 Cap Cp 01uF 5 X7R 16V 0402 C22 1570 03103 261 Cap Cp 01uF 5 X7R 16V 0402 C23 1570 03103 261 Cap Cp 01uF 5 X7R 16V 0402 C24 1570 03103 261 Cap Cp 01uF 5 X7R 16V 0402 C25 1570 03103 261 Cap Cp 01uF 5 X7R 16V 0402 C26 1570 03103 ...

Page 105: ...R8 4734 01002 311 Res CP 10K 1 1 16W 0402 R9 4734 01001 311 Res CP 1 00K 1 1 16W 0402 R10 4734 01502 311 Res CP 15K 1 1 16W 0402 R11 4734 01001 311 Res CP 1 00K 1 1 16W 0402 R12 4734 01502 311 Res CP 15K 1 1 16W 0402 R13 4734 01001 311 Res CP 1 00K 1 1 16W 0402 R14 4734 05621 311 Res CP 5 62K 1 1 16W 0402 R15 4734 01652 311 Res CP 16 5K 1 1 16W 0402 R16 4734 04751 311 Res CP 4 75K 1 1 16W 0402 R17...

Page 106: ... DSP U2 3134 30949 800 IC Flash Mem U3 3134 30949 900 IC Quad 2 Input Pos NAND U4 3134 30950 000 IC 16 Bit A D 16 Bit D A U5 3134 30950 400 IC Sw Reg 3 3V SOT 23 U6 3134 30950 305 IC REG 1 5V 150mA LDO U7 3134 30960 100 IC Uni Direct Xlator U8 3134 30950 600 IC T_Logic ULP D_Flp Flp U9 3134 30950 601 IC T_Logic ULP Y1 2390 30957 100 TCXO 19 6608 MHz SMD ...

Page 107: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 16 Options Board 309 620 Rev D Page 6 61 ...

Page 108: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 17 Options Board Schematic Page 6 63 ...

Page 109: ...Replacement Parts Keyboard Display Assembly Item Reference Number Part Number Description Item 1 2001 30959 701 KEYBOARD SILICONE Item 2 2003 30964 300 LCD Keyboard Assembly Item 3 1411 30959 600 Insert Assembly Black Item 4 2816 30434 012 Scr 2 28x 156 FPH Item 5 2512 20034 101 Gasket Kybd Display ...

Page 110: ...GPH CMD VHF Radio Illustrated Parts List BK RADIO Figure 6 20 Keyboard Display Board Schematic Page 6 67 J E Villanueva ...

Page 111: ...GPH CMD VHF Radio Integrated Circuit Data BK RADIO Page A 1 ...

Page 112: ...Integrated Circuit Data GPH CMD VHF Radio Page A 2 BK RADIO ...

Page 113: ...GPH CMD VHF Radio Integrated Circuit Data BK RADIO Page A 3 ...

Page 114: ...Integrated Circuit Data GPH CMD VHF Radio Page A 4 BK RADIO ...

Page 115: ...GPH CMD VHF Radio Integrated Circuit Data BK RADIO Page A 5 ...

Page 116: ...Integrated Circuit Data GPH CMD VHF Radio Page A 6 BK RADIO ...

Page 117: ...GPH CMD VHF Radio Integrated Circuit Data BK RADIO Page A 7 ...

Page 118: ...Integrated Circuit Data GPH CMD VHF Radio Page A 8 BK RADIO ...

Page 119: ...GPH CMD VHF Radio Integrated Circuit Data BK RADIO Page A 9 ...

Page 120: ...Integrated Circuit Data GPH CMD VHF Radio Page A 10 BK RADIO ...

Page 121: ...GPH CMD VHF Radio Integrated Circuit Data BK RADIO Page A 11 ...

Page 122: ...Integrated Circuit Data GPH CMD VHF Radio Page A 12 BK RADIO ...

Page 123: ...GPH CMD VHF Radio Integrated Circuit Data BK RADIO Page A 13 ...

Page 124: ...Integrated Circuit Data GPH CMD VHF Radio Page A 14 BK RADIO ...

Page 125: ...GPH CMD VHF Radio Integrated Circuit Data BK RADIO Page A 15 ...

Page 126: ...Integrated Circuit Data GPH CMD VHF Radio Page A 16 BK RADIO ...

Page 127: ...GPH CMD VHF Radio Integrated Circuit Data BK RADIO Page A 17 ...

Page 128: ...Integrated Circuit Data GPH CMD VHF Radio Page A 18 BK RADIO ...

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