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G U A R D I A N V H F 1 1 0 W M O B I L E

3-1

CHAPTER 3: SOFTWARE THEORY OF OPERATION

3.1 Functional System Operation

3.1.1 General

All control and channel software is resident in the RECM.

3.1.2 Guardian Block Diagram

Figure 3-1: Software Theory of Operation Block Diagram

Switches

LCD

Keypad

Keypad MPU

H8 Controller

DSP

Audio

25 Acces

sory

onnect

Transceiver

PSU

Power Supply

External Power

Receiver/Exciter/Control

Module (RECM)

Battery
Data

Power

Modulation

Control

IF Output

Control/Fill/Code

Keyfill

User Data

Содержание G25AMK005

Страница 1: ...MOBILE RADIO TECHNICAL MANUAL Datron World Communications Inc 3030 Enterprise Court Manual Part No G25AMK005 Vista CA 92083 USA Release Date May 2002 Phone 760 597 1500 Fax 760 597 1510 Revision A E...

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Страница 3: ...of the Rights in Technical Data and Computer Software clause at 252 227 7013 For civilian agencies Restricted Rights Legend Use reproduction or disclosure is subject to restrictions set forth in subp...

Страница 4: ...r features and functions made available or restricted to the user FCC licensees are prohibited by federal law from enabling the radio to directly enter transmit frequencies using the radio s controls...

Страница 5: ...2 4 15 LED 2 9 2 4 16 RECM Power Consumption 2 9 2 5 RECM TRANSCEIVER SECTION 2 9 2 5 1 Interface Section 2 9 2 5 2 Receiver Section 2 10 2 5 3 Digital Analog Control 2 13 2 5 4 Keypad Microcontrolle...

Страница 6: ...ERFACE 3 12 3 5 1 CAI Data Interface 3 12 3 5 2 Synchronous Serial Data Interface 3 12 3 5 3 CAI Data Link Layer 3 12 3 5 4 Transmit Physical Link Layer 3 13 3 5 5 Receive Physical Link Layer 3 14 3 5...

Страница 7: ...s 5 5 5 4 2 Keyfill 5 5 5 4 3 Zeroize 5 6 CHAPTER 6 SERVICING THE RADIO 6 1 6 1 GENERAL 6 1 6 2 SELF TEST AT POWER UP 6 1 6 3 CAUTION 6 1 CHAPTER 7 TROUBLESHOOTING 7 1 7 1 INTRODUCTION 7 1 7 2 RADIO F...

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Страница 9: ...by modern public safety and commercial users The radio system is built from a remote power amplifier and a control head The 110W RF power amplifier mounts in a remote location such as a vehicle trunk...

Страница 10: ...oise wideband 46 dB 25 kHz 40 dB 12 5 kHz FCC Modulation Designators 16K0F3E 11K0F3E 20K0F1E Audio Distortion at 1000 Hz 2 Audio Response 1000 Hz Ref 3 dB 300 to 3000 EIA TIA 603 Frequency Stability 3...

Страница 11: ...Correction Method RS golay hamming Mounting Under dashboard using bracket Dimensions 2 94 x7 13 x7 06 H x W x D Weight 5 lbs Approximately Case Metal and plastic Temperature Range 30 to 60 C Channel...

Страница 12: ...st Method Procedure Low Pressure Altitude 500 4 II High Temperature 501 4 I II Low Temperature 502 4 I Temperature Shock 503 4 I Solar Radiation Sunshine 505 4 I Humidity 507 4 I Salt Fog 509 4 I Sand...

Страница 13: ...FF and R T switches Control Power spliter output power control monitor Filter combiner AMP AMP power sensor R R T T Fused DC Power DB9 Speaker out Ignition and Emergency Switch DB25 System Control and...

Страница 14: ...the main radio control function and all the baseband signal processing TCVR Module DB25 Accessory Connector Power Supply Keypad Board and Front Panel Interface Grey areas connect through the 80 pin c...

Страница 15: ...off regardless of the rotary switch setting However the H8 controller uses the PWRHOLD and PWROFF lines to implement a clean controlled switch off Figure 2 3 RECM Power Supply 2 4 1 3 Transmit Power...

Страница 16: ...he keypad board This interface is used to communicate with the keypad MPU and directly load the LCD controller The clock on this interface runs at 100 kHz An associated interrupt input to H8 is used t...

Страница 17: ...ce is capable of writing to the DAC at 48 ksps while still reading the ADC at 96 ksps The DSP ESSI 0 port is used to provide a full duplex synchronous interface to the audio CODEC using 8 kHz sampling...

Страница 18: ...is implemented in the FPGA 2 4 9 Logic Audio CODEC The audio CODEC is an integrated ADC DAC and audio filter device capable of full duplex operation on voice bandwidth signals at 8 ksps The samples ha...

Страница 19: ...re than 50 dB of useful attenuation range The circuit is part of a DAC controlled closed loop system in conjunction with the detector power control circuit U12 U13 and associated components which cont...

Страница 20: ...signal enters into the RX INPUT via the PIN diode switch discussed previously D1 and D2 are Schottky protection diodes to protect the front end circuitry from RF overloads that could occur if the PIN...

Страница 21: ...second LO consists of CR26 R33 Y1 L24 C59 C226 C227 and Q35 The oscillator is a Colpitts type with the crystal operating in the series mode CR24 is a varactor diode used to set the oscillator on frequ...

Страница 22: ...31 node transmit Q25 is the second buffer amplifier This amplifier is common to both the receive and the transmit VCOs R131 R141 and R142 are the combining elements used to make this possible This buf...

Страница 23: ...ntrol the attenuator is normally set for a desired amount of attenuation by this DAC controlled signal Q37 Q38 Q39 Q40 Q41 and associated components are used to enable and disable the 14 dB step atten...

Страница 24: ...he 3 3V supply as the LCD driver device 2 6 Audio Amplifier Board 2 6 1 Description The Audio amplifier board contains the internal and external audio and control circuitry It also houses the DB25 acc...

Страница 25: ...eived signal both amplifiers are placed in a low current standby mode by squelch comparator 2 6 5 Power Levels Detector Converter and RF DC Combiner ON OFF PTT and RF output power control signals to t...

Страница 26: ...t Q8 E to be equal to that at U3 3 After high power transmit is detected at the PA output The RF PA test circuit forces additional current back into this line The op amp loop holds the voltage at the...

Страница 27: ...river has an internal display RAM that copes with all the display refreshing autonomously Display data transfers from the main controller are only required when the display is changed selective displa...

Страница 28: ...LED lamps are mounted to this board Connection to the internal 5W speaker is via J6 ON OFF control Transistors Q11 14 are connected to the outputs of the binary volume switch SW3 The transceiver uses...

Страница 29: ...ockout latch is reset It is recommended to utilize the PTT condition lockout during programming the PTT light will stay off This is done by pressing ENTER key and after that hold the PTT key depressed...

Страница 30: ......

Страница 31: ...tware is resident in the RECM 3 1 2 Guardian Block Diagram Figure 3 1 Software Theory of Operation Block Diagram Switches LCD Keypad Keypad MPU H8 Controller DSP Audio DB25 Accessory Connector Transce...

Страница 32: ...ntrol coding 3 2 Radio Control Software This software controls the transceiver and baseband signal processing functions 3 2 1 Audio Control H8 controls the analog audio signal processing Audio for tra...

Страница 33: ...ols de emphasis and companding Digital setting Data rate and key algorithm Project 25 setting NAC TGID BER and test mode CVSD setting Data rate and key Project 25 setting Read by H8 SS bits low rate d...

Страница 34: ...eference oscillator modulation signal and used as a dc offset in receive mode 3 2 3 5 Receiver Control Setting 3 3VRXE enables the linear receiver chain The DSP implements software AGC system to contr...

Страница 35: ...d to control the following FPGA outputs Output Description PWRHOLD Set during normal operation the radio stays on regardless of the on off switch When PWROFF indicates that a switch off is required so...

Страница 36: ...m is shown in Figure 3 2 The major signal processing functions of the DSP transmit chain are described in the following paragraphs 3 3 1 1 Audio Coder Decoder CODEC The Guardian uses a Texas Instrumen...

Страница 37: ...shaping filter Interpolation from 8 ksps to 48 ksps is accomplished using a linear phase FIR filter A single quadrant sine look up table LUT using fractional addressing and quadrant folding generates...

Страница 38: ...ceive DSP Chain block diagram is shown in Figure 1 3 The major signal receive functions of the DSP receive chain are described in the following paragraphs Figure 3 3 Receive DSP Chain 3 3 2 1 Transcei...

Страница 39: ...nary data for use by the Project 25 Voice Module Once a target signal is detected the radio disables squelch using an enable transmit function so the user can monitor the signal If the detected signal...

Страница 40: ...algorithm is a 48 ksps data stream representing the sampled FM demodulated carrier To allow for variation in carrier frequency the dc component of the demodulated carrier is removed before zero cross...

Страница 41: ...imultaneous presses of the PTT switch and one auxiliary key are allowed Debounced and validated auxiliary key presses and PTT press and releases are passed to the serial data output buffer 3 4 5 Switc...

Страница 42: ...o the DSP and the clear to send CTS output from the DSP The request to send RTS input to the radio for this interface is processed by H8 3 5 2 Synchronous Serial Data Interface The DSP supports a 12 k...

Страница 43: ...ace software and a number of mode dependent physical link layer software modules 3 5 4 1 Transmit Modulation Interface The software provides a common interface to the dual modulation DAC in the transc...

Страница 44: ...one of ten possible phases for output to the slicer The slicer incorporates an averager with a time constant of at least 100 bits to correct for dc offsets in the received signal In parallel with the...

Страница 45: ...and secure receive modes Channel key assignment is accomplished by selecting the corresponding key tag Upon entering the secure transmit or secure receive mode H8 transfers the appropriate encryption...

Страница 46: ...current consumption These features are provided by the maximum use of low current standby modes in H8 and an interrupt driven architecture with a minimum of input polling In radio standby and receive...

Страница 47: ...log inputs are measured as appropriate to the radio mode of operation Input Description RSSI Receiver signal strength WRU External device detect BATT Main radio 10V supply monitor PA TEMP Transmitter...

Страница 48: ...l devices are accessible by the controller software 3 6 3 1 1 H8 Internal RAM The H8 controller has 2K x 8 of internal RAM This data is not retained when the radio is switched off or the power is remo...

Страница 49: ...r levels are associated with different channels programmed into the radio This data is programmed into the radio through the fill port 3 6 4 Program Fill Control Interface The controller provides a se...

Страница 50: ...ent the asynchronous data formats and baud rates 9 600 19 200 and 38 400 for the PC serial port The serial port driver software also controls the 232OFF signal to maintain the RS232 in its low current...

Страница 51: ...rammer When a zone is active selected channels within the zone are selected using the 16 position channel select switch on the front panel of the radio 4 1 3 Banks A bank is a group of zones Zones are...

Страница 52: ...select a different channel in the zone To change zones program one of the side keys program the three position toggle switch to zone select or program through the display using the select menu 4 3 7 T...

Страница 53: ...DES CVSD modulation voice 25 kHz 12 kbps Project 25 clear digital voice 12 5 kHz DTMF overdial 5 1 2 Antenna The antenna is a SO239 UHF jack mounted to the rear panel 5 1 3 Guardian PC Programmer Not...

Страница 54: ...Controls The radio controls consist of a 16 position channel rotary knob an on off volume rotary knob a 3 position toggle switch 3 programmable function keys an emergency push button a PTT switch and...

Страница 55: ...he emergency channel There are two programmable modes audio full alert and silent and display alert and silent In full alert mode EMERGENCY flashes on the display and an audio tone is sounded In silen...

Страница 56: ...rier using either conventional 12 5 or 25 kHz FM modulation or 12 5 kHz compatible 4 level FM C4FM The signal source is analog or digitized voice signals 5 3 1 2 Transmit Squelch Transmit squelch para...

Страница 57: ...DCS variable 5 3 2 2 2 Digital Receive Squelch There are 4 types of digital receive squelch Type Description Monitor Squelch is opened on any intelligible digital signal The NAC and talkgroup ID do n...

Страница 58: ...be programmed using an optional external emergency key to zeroize all encryption keys Using the programming menu the radio can also zeroize all encryption keys or selectively zeroize individual encryp...

Страница 59: ...rrors are reported to the user through displayed error messages and logged in the Flash The tests implemented include Flash checksum CRC RAM read and write FPGA configuration DSP host interface Keypad...

Страница 60: ......

Страница 61: ...2 and 1 channel in zone 3 For all of the channels use assigned transmit and receive frequencies turn transmit squelch off and set receive squelch to carrier level 8 When more than one remove and rece...

Страница 62: ...7 2 G U A R D I A N V H F M O B I L E...

Страница 63: ...ency band Continuous Tone Controlled Squelch System CTCSS Tone A sub audible tone superimposed on an analog signal to reduce interference from traffic and background noise Digital Coded Squelch DCS A...

Страница 64: ...can have up to 7 shadow channels A shadow channel has the same transmit and receive frequencies options and transmit power levels as its primary channel Individual shadow channels can be configured fo...

Страница 65: ...d there is activity on the transmit channel Invalid mode No programmed data on the selected channel Steady low pitched Radio locked Radio locks after 3 consecutive wrong password attempts Key press Va...

Страница 66: ...9 2 G U A R D I A N V H F M O B I L E...

Страница 67: ...ator input asserted by voltage 0 8 Vdc 12 GND Ground 13 INTERNAL_SPEAKER_P Balanced audio input from external device can override RECM audio output signal 14 PTT_SWITCH PTT input asserted by voltage c...

Страница 68: ...KER_P External speaker 6 BATTERY Battery power 7 GROUND Ground 8 GROUND Ground 9 EMERGENCY_SWITCH Emergency switch 10 3 Microphone Jack Connector Pins and Functions Pin Signal Name Description 1 EXTER...

Страница 69: ...G U A R D I A N V H F 1 1 0 W M O B I L E 11 1 CHAPTER 11 SCHEMATICS...

Страница 70: ...Y 2 S1 MENU KEY 1 KEYPAD_SCAN_OUT_1 KEYPAD_SCAN_OUT_2 KEYPAD_SCAN_OUT_3 KEYPAD_SCAN_IN_1 KEYPAD_SCAN_IN_2 S5 MENU KEY 1 S6 MENU KEY 1 S7 MENU KEY 1 LCD_CLOCK LCD_TX LCD_CS_N LCD_RESET_N LCD_DATA_MODE...

Страница 71: ...458 FB23 FB22 FB21 FB20 FB19 FB17 FB16 FB15 FB14 FB13 FB12 FB11 FB10 FB9 FB8 FB7 FB6 FB5 FB4 C52 100pF FB18 C26 100pF C27 100pF C28 100pF C29 100pF C30 100pF C31 100pF C32 100pF C35 100pF C36 100pF C3...

Страница 72: ...M2904 1 2 3 U6A LM2904 C25 1uF 25V SWBAT1 R55 0 01ohm 1 R63 100k SWBAT1 7 5 6 U7B LM2904 Q12 2N7002 R37 20 5K R27 10k R59 20 5K R58 20 5K SWBAT2 Vref R3 68k R5 100k Vref C98 0 1uF C100 10uF C18 1uF 25...

Страница 73: ...PAD_SCAN_IN_1 47K Q1 DTA144EK 3 3V R28 0ohm R26 0ohm R27 0ohm C24 0 1uF C30 0 1uF 1Y 1 1Z 2 2Y 4 4E 12 2Z 3 3Y 8 3Z 9 4Y 11 4Z 10 2E 5 1E 13 3E 6 VEE 7 VCC 14 U4 74HC4016 FB10 FB 3 3DTMF 3 3DTMF C39 D...

Страница 74: ...C313 C317 C320 C327 C329 C330 C333 C391 C394 C398 C402 C404 C530 C533 C548 D5 D6 D22 D29 D34 D51 J1 J4 L23 L26 L27 L29 L32 L34 L36 L54 L57 L59 L67 P1 Q3 Q6 Q8 Q9 Q20 Q28 Q30 Q37 Q45 Q56 R13 R30 R32 U5...

Страница 75: ...ORT 9 PORT 8 PORT 7 U63 HD6433044SS00XI 365582 VCC 68 5 17 4 16 3 15 2 14 1 13 0 12 4 91 3 90 MD2 75 MD1 74 MD0 73 EXTAL 66 XTAL 67 61 STBY 62 RES 63 VPP RESO 10 NMI 64 0 93 1 94 2 95 3 96 4 97 5 98 6...

Страница 76: ...0 1 uF 10 C509 0 01 uF 10 C522 2 2 uF 10 10V C508 0 1 uF 10 E4 PAD2 1 L79 BEAD R540 10K 1 R546 100 1 R552 10K 1 R569 NU R550 NU C525 100 pF 5 C532 NU C526 100 pF 5 C527 100 pF 5 C531 100 pF 5 C535 10...

Страница 77: ...0K 1 R500 100K 1 R496 15K 1 C471 2 2 uF 10V C480 0 033 uF 10 C470 0 1 uF 10 C478 470 pF 10 C467 0 1 uF 10 C479 0 1 uF 10 L74 BEAD R485 10 1 R560 475 1 R562 475 1 R561 33 2K 1 R559 33 2K 1 R492 150K 1...

Страница 78: ...Q60 2N7002 1 3 2 R471 10 1 D53 CMDSH2 3 2 1 R468 10 1 R464 10K 1 L73 BEAD C457 0 1 uF 10 Q62 2N7002 1 3 2 R480 4 75K 1 D54 CMDSH2 3 2 1 C461 100 pF 5 R565 10K 1 D55 CMDSH2 3 2 1 D60 CMDSH2 3 2 1 R475...

Страница 79: ...0 10V U51 LT1118 GND 2 VOUT 1 TAB GND 4 VIN 3 Q57 2N7002 1 3 2 R440 10 1 Q58 2N7002 1 3 2 U49A Si4953DY 1 2 7 8 U48 LTC1434IGN 365421 PWRVIN 20 SVIN 18 LBI 10 PLLIN 17 PLL LPF 16 COSC 15 ITH 13 VPROG...

Страница 80: ...Added GND to ICP Control Keypad R414 100 1 C410 0 01 uF 10 R410 1K 1 D40 CMDSH2 3 2 1 L69 BEAD R411 1K 1 R419 10 1 D42 CMDSH2 3 2 1 C411 0 01 uF 10 D45 CMDSH2 3 2 1 Q54 2N7002 1 3 2 R417 100 1 R413 1...

Страница 81: ...9 12DACDATA 3 9 8DACENA 2 9 7 5VT_XCVR 12 20VCLK 1 11 EEPWP 1 9 8DACENA 2 9 EEPWP 1 9 7 5VA 1 Scale R ev Sheet o f Size CAGE Code Dwg No None 23386 Drawn Thales Communications Inc Rockville Maryland T...

Страница 82: ...291 100 1 R172 90 9K 1 R290 100 1 R252 100K 1 C545 033 uF C257 0 1 uF 10 R254 100K 1 U76 LM7301 365661 OP 1 V 2 IP 4 IP 3 V 5 R255 100K 1 C269 0 1 uF 10 C271 0 1 uF 10 C544 033 uF U31 MAX525B 365588 O...

Страница 83: ...F 5 C13 120 pF 5 C19 2 10 pF SS 28058 1 2 C6 39 pF 5 R208 NU L10 330 nH 5 C14 18 pF 2 R251 51 1 1 C15 22 pF 2 C215 0 1 uF 10 L11 1 2 uH 5 C56 10 pF 0 25pF L22 150 nH 2 R276 51 1 1 C21 NU R571 49 9 1 R...

Страница 84: ...14 SRCLK 11 SRCLR 10 RCLK 12 G 13 QA 15 QB 1 QC 2 QD 3 QE 4 QF 5 QG 6 QH 7 QH 9 VCC 16 GND 8 R106 22 1 1 C140 1000 pF 5 R107 10 1 C123 4 7 uF 10 10V SS 25122 475 10 C160 1000 pF 5 R99 47 5 1 R183 1M...

Страница 85: ...00 pF 5 TP5 TP 1 R57 150 1 R72 1 82K 1 R319 0 TP6 TP 1 R55 1 3K 1 L38 1 2 uH 2 R52 475 1 Q15 BSS123 SS 32564 1 3 2 U14 LP2980A 5 0 365413 VOUT 5 ON OFF 3 4 4 VIN 1 GND 2 C216 0 1 uF 10 C540 1000 pF 5...

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