General Product Description 2 1.5 Functional Block Diagram coincide 4 INTERFACE DESCRIPTION IRC ncn 6 2.1 External Lo... aes 6 2.1.1 RE POTS Lottie IEEE ice vies ans 6 2.1.2 Dc Input Power Dvina iia 6 2.1.3 Interface PIOUS ooh 7 2.1.4 Interface Functional Description 8 SPECIFICATIONS ©. ties 9 3.1 DTA50 General Specifications cur. 9 3.2 Transmitter Specifications aloe ia 10 3.3 Receiver Specifications iii 11 3.4 Mechanical Specifications coo 12 3.5 Environmental Specifications ia 12 3.
THEORY OF OPERATION 16 5.1 Micro controller Section Cain 18 52 level FSK Modem Section 20 5.3 Injection Synthesizer iii 21 5.4 Transmit Base band Processing 23 55 UHF RECEIVED out seer ini annexation 24 5.5.1 UHF Front-End Section 24 5.5.2 45 MHz Receiver Section 26 5.6 Diversity Reception Controller 27 5.6.1 RSI Input Section 28 5.6.2 RSI Level Sifter 28 5.6.3 Receiver Selector co. 29 5.6.4 Recovered Modulation Input 29 5.6.5 Recovered Modulation Switch oil 30 5.6.6 Carrier Detector oo ii 30 5.
82 10 7.3.4 Micro strip Patch Antennas. coal e 40 MAINTENANCE AND ALIGNMENT PROCEDURES 41 8.1.1 Test Equipment Setup 41 ee 41 RECOMMENDED TOOLS AND TEST EQUIPMENT 42 8.2.1 Recommended Tools 42 8.2.2 Recommended Test Equipment 42 8.3 Transmitter Alignment Procedure 43 8.3.1 Injection Frequency Adjustment 43 8.3.2 Transmit Modulation Adjustment 44 8.4 Receiver ALIGNMENT ooh 45 8.4.1 Receiver #1 Distortion and SIN AD Alignment 45 8.4.2 Receiver #2 Distortion and SIN AD Alignment 47 8.
1. INTRODUCTION 1.1 Document Scope This document describes the Electrocute Model DT450 mobile radio comprehensively. Section 1: non-technical overview of the product and its features. Section 2: more detailed; describes various interfaces (i.e. connectors, power sources, interconnections, etc.). Section 3: covers various specifications the product is designed to meet. Section 4: contains operating and maintenance instructions.
1.3 Product Features DT450 Features: * Patented, dual receiver, diversity reception system U.S. Patent No, 5,640,695 . High stability 1.0 ppm . Internal 4-level FSK modem, 4800, 9600, 19200 bps with DES . Fast transmit attack time less than 10 sec ° 2 advanced-architecture, extremely sensitive, high-overload, FM receivers ° 40 Watt Tx output power . Digital PLL frequency synthesizer . Broadband operation by design . Compact size, rugged construction 1.
Amplifier) design which results in extreme sensitivity and high overload capability. The radio is capable of operating with any authorized transmit-to-receive frequency separation and is capable of operating on all authorized channels within the 400 to 512 MHz band. The mechanical package of the DT450 is extremely robust, constructed primarily of machined 1/4" aluminum plate.
1.5 Functional Block Diagram ant 2 V2 | Divers TY AIC oversensitive lg RECEIVER secretion controvert fem x Carmen DETECT J frm RECEIVER ceo 4 a conch ER sine Je A — INSECT ION POWER syntheses 1788 ARTERIAL MODULATION Figure 1. DT450 Functional Block Diagram The DT450 is divided into eight functional blocks as depicted in Figure 1.
ANT Ave Transitive | a receive 2 fg og] erection CONTROLLER at T carries DETECT ans Lo] receiver ices Je eve ese oe ve fed CONTRACTILE AIDE WITCH A | GENT 10m SYNTHESIZER erp] EXTERNAL MULATTO iON Figure 2. DT450 Functional Block Diagram Repeated for ceder convenience) Receiver: DRC (Diversity Reception Controller): Power Amplifier: T/R Switch: Provides reception and demodulation of Frequency Modulated (FM) UHF (400 to 512 MHz) RF signals.
2. INTERFACE DESCRIPTION 2.1 External 2.1.1 RF Paris The DT450 has two external RF ports. Both are type "N" coaxial connectors mounted directly to the chassis of the radio. J2 is a bi-directional port which serves as the transmit port during transmit operation, and as the receive port for receiver 1 in the receive mode. J3 is a receive only port for receiver 2 and is dedicated to diversity reception. 2.1.
2.1.4 Interface Functional Description Input Output Signal Name Power Description GND P Signal ground SWINISH P Switched revolt DC power source TURKEY* 1 A logic low on this pin will cause the DT450 to key, used by a control head or an external modem device to key the radio RX DATA o Recovered modulation, diversity reception discriminator audio, low pass filtered by a 4th-order 4800 Hz Bessel filter, approximately 600 mV peak-to-peak for a 1,0 kHz test tone at 4.
3. SPECIFICATIONS 3.1 DT450 General Specifications PARAMETER SPECIFICATION Frequency range 400 to 512 MHz (in 20 MHz bands) Channel spacing 12.5/ 25.0kHz Mode of operation Half-duplex, diversity reception Operating temperature range -30th +60C (-22 to +140F) Power supply voltage 13.8VDC 20% Power supply current consumption 0.75 A receive 9.
3.2 Transmitter Specifications PARAMETER SPECIFICATION Frequency range 400 to 512 MHz Channel spacing Frequency source Dielectric resonator based VCO Frequency stability +1 1.0 ppm -30C to +60C (-22F to +140F) Spurious and harmonic emissions -DBMS (maximum level) Transmit power 40 watts minimum (20 MHz bandwidth) SWERVE at transmit antenna port 2.0 or less (400 to 512 MHz) Load mismatch tolerance 8.
3.3 Receiver Specifications PARAMETER SPECIFICATION Frequency Range 400 to $12 MHz (in 20 MHz bands) Channel Spacing 12.5/ 25.0kHz Injection Frequency 45 MHz below the base station frequency (low side injection) Sensitivity 12.04B SIN AD at -121 dBi maximum level 12.0dB SIN AD at -122 dBm typical 12.0dB SIN AD at -123 dBm typical with diversity Selectivity 70 dB (minimum at 25 kHz) Spurious response 85 dB minimum Inter modulation distortion 75 dB minimum IF bandwidth 7.5kHz standard, 4.
3.4 Mechanical Specifications PARAMETER SPECIFICATION Width (excluding mounting bracket) 4.40" Depth (excluding mounting bracket) 8.60" Height (excluding mounting bracket) 2.75" ‘Width {including mounting bracket) 8.60" Depth (including mounting bracket) 8.60" Height (including mounting bracket) 3.50" Weight 4.
3.6 Regulatory Agency Specifications 3.6.1 FCC SPECIFICATION RULE SECTION Transmitter conducted spurious emissions CFR 47 Part 2 Section 991 Transmitter radiated spurious emissions CER 47 Part 2 Section 993 Transmitter frequency stability CFR 47 Part 2 Section 995 Transmitter RF output power CFR 47 Part 2 Section 985 Transmitter occupied bandwidth CFR 47 Part 2 Section 989 Receiver Spurious emissions CFR 47 Part 15 Section 63 Computer emissions (Class B) CFR 47 Part 15 Section 810 3.
4. OPERATION AND MAINTENANCE 4.1 Modes of Operation The DT450 is a simplex / half-duplex two-way mobile radio with dual receiver diversity reception. The radio can operate with carrier frequencies between 400 and 512 MHz in bands of 20 MHz. The DT450 has two RF ports, one {transmittance port, and one receive only port (dedicated to diversity reception).
4.3 Maintenance O00 0004 WARNING FCC regulations require that the frequency and ‘deviation of a. transmitter must. be checked before it is place into service and re-checked at one year intervals thereafter, FCC regulations also state that the RF output power: of a radio’ transmitter shall be no more than that required for satisfactory operation considering the ‘area to be covered and local conditions.
5. THEORY OF OPERATION avr DIVERSITY AUDIT Severe RECEIVER RECEPTION committee fe A ANT 4 RECEIVER cso 4 Even Fac — a controller woo Sweeten » insect Tom coven v —] SYNTHS | 288 Exe TIER AMPLIFIER beer — mb] 3 EXTERNAL MODULAR 10M Figure 3. DT450 Functional Block Diagram repeated for reader convenience) The DT450 is divided into eight functional blocks as depicted in Figure 3.
ANT 2 DIVERSITY AUC IC COVERS ITY RECEIVER 2 homer RECEIVER CRS TR | CONTROLLER spittoon [4 {NEGLECT ION ; E Owes _EXCITER — SYNTHS | ZER & aL FER K EXTERNAL AMBULATE ION Figure 1. DT450 Functional Block Diagram @repeated for reader convenience) Receiver: DRC (Diversity Reception Controller): Power Amplifier: T/R Switch: Provides reception and demodulation of FM (Frequency Modulated) UHF RF signals. The receivers also provide RF carrier amplitude information used by the DRC.
5.1 Micro controller Section 70] To INJECTION SYNTHS | ZER BRATTAIN (CATCH. : Kc ABLE TO/FROM PERIPHERAL DEVICES DATA BUS LEVEL FER MODEM ADDRESS BUS RATIO I s252 CHANNEL lo CONTROLLER SELECT LINES J TRANSMIT nszaz PORT CONTROL 4 Figure §. Micro controller Functional Block Diagram The DT450 micro controller controls all programmable devices in the radio and handles all internal and external communications. The micro controller is in essence, the brain of the radio.
for transmission. In the receive mode of operation, the modem passes received application data to the micro controller. The micro controller checks the ID field of the standard message portion of the received message to determine whether to pass this message to the external device. If so, it crypts the message, attaches the BR XI header and forwards the data to the external device via the RS232 interface.
5.2 4 Level FSK Modem Section The DT450 contains an internal 4-Level FSK modem for reliable transfer of data over-their. The modem interfaces with the micro controller and the DT450’s modulation / demodulation circuits to deliver reliable two-way transfer of high-speed application data over a wireless link. TO TRANSMIT MODULATOR data BUS Tx OUT, ADDRESS BUS FROM RECEIVER CISCO IMI GATOR F) Figure 6.
5.3 Injection Synthesizer TRANSMIT MODULAR 10 more oven novice pei connection OUT 2 Sven A ore our FREQUENCY TN sereneness or resize R CO Pin No TRANSMIT wean aT ion 4 Figure 7. Injection Synthesizer Functional Diagram The injection synthesizer creates the receiver injection signals in the receive mode of operation, and the transmit injection signal during transmit operation. Figure 7 is a functional diagram of the DT450’s injection synthesizer section.
for final amplification prior to transmission. Bowen power diviner Diviner Power DIVIDER INJECTION BUT { ! FADS VE #0 cot RECOVERY «008 Sent Hes TER FILTER Figure 8. Injection Synthesizer Functional Diagram (Repeated for reader convenience) The fourth injection signal is used at all times by the digital frequency synthesizer to keep the radio on channel. The frequency synthesizer divides the injection signal to produce a quotient signal of 12.5 kHz. The synthesizer also divides the signal from the 10.
5.4 Transmit Base band Processing MODEST ve (TEV IAT ION SONTAG EXT MID Get VEO ensurer BUFFER SUMMER 7 E aTe TOO ves COW FREQUENCY DEVIATION CONTROLS Figure §. Transmit Base band Processing Functional Diagram Figure 9 is a functional diagram of the DT450’s transmit base band processing section. The DT450 js capable of being modulated by an external device (control head, external modem, etc.) or by the internal 4-level FSK modem.
5.5 UHF Receiver The DT450 employs two independent, high-performance, low-noise, dual conversion FM receivers. The receiver is divided into two main sections, a front-end section and a 45 MHz receiver section. eur TREE ews SEABIRD Low-ions sez Lase FRONT END TATE Sean SECTION REJECT FILTER aur CUB BENT TO VOLTAGE converters [I pre EAN aoe E IE APF IER mite ee FILTER rie s Mater 203 | abt Figure 10.
5.5.1 UHF Front-End Section nur — I 51 gna OW mo LOW NOISE MAGES NO 88 Ave FAIR “game FILTER pres TECHIE ION signal wiz / A. out MIXER EJECT FILTER 45 Mz CRYSTAL FILTER FRONT END Figure 11. UHF Receiver Front-End Functional Diagram Figure 11 is a functional block diagram of the receiver front-end section. The front-end section employs an advanced-architecture cascaded-LA (Low Noise Amplifier) design for extreme sensitivity and high-overload performance.
5.5.2 45 MHz Receiver Section ee 1 CURRENT TH) VOLTAGE 8 seafront 45 MHz RECEIVER SECTION ax sas wiz reasoner 5 secondary Figure 12. 45 MHz Receiver Functional Diagram Figure I2 is a functional block diagram of the 45 MHz receiver. The 45 MHz first IF from the front-end is mixed with a 44.545 MHz injection frequency to produce a 455 kHz second IF which is passed by a 455 kHz filter. The second IF is then amplified and limited by an IF amplifier and limiting amplifier respectively.
5.6 Diversity Reception Controller SIFTER RSS in Put RECEIVER 2 BSS LEVEL SIFTER Fe REVERENCED MODULAR 10N DIVERSITY TTR AUDIO OUT | Figure 13. DRC Functional Block Diagram Figure 13 is a functional block diagram of the DRC (Diversity Reception Controller). The DRC is the central processor of a dual-receiver diversity reception system. The DRC accepts inputs from two receivers, determines which receiver has the better SNR (Signal to Noise Ratio), and selects that receiver to supply recovered modulation.
The DRC is divided into 7 functional sections. 5.6.1 RSI Input Section asst mess Level LL ari Fern LL A Lo currant Low rads ensurer Filter Figure 14. RSI Input Section Functional Diagram Figure 14 is a functional diagram of the RSI input section of the Forced ease of explanation, only one section is shown). RSI from each receiver is buffered to provide RSI load isolation.
5.6.3 Receiver Selector LEVEL SHIFTED RSS! 1g TO RECOVERED MODULATION SWITCH LEVEL SHIFTED RSFSR 20— | COMPARATIVE Figure 16, Receiver Selector Functional Diagram Figure 16 is 2 functional diagram of the DC's receiver selector. The receiver selector uses level-shifted RSI to select the appropriate receiver. In essence, the selector is a comparative which will output one logic level if receiver 1 RSI is higher than receiver 2 RSI (and will output the other logic level otherwise).
5.6.5 Recovered Modulation Switch ee BEWITCH CONTROL . [ FROM RECEIVER SELECTOR) RECOVERED MODULATION 7 go [0 cont Rel mpm SELECT RECOVERED MODULATION RECOVERED MODULATION 2 or 13 CTO OUTPUT FILTER SECTION Figure 18. Recovered Modulation Switch Functional Diagram Figure 18 is a functional diagram of the DC's recovered modulation switch. This section receives recovered modulation from both receivers as inputs. A control signal from the receiver selector actuates the switch appropriately.
5.7 Receive Base band Processing Div AUDIO DATA 3 i BESSEL BUFFER LOW-PASS Fitter Disc AUD Or Te MODEMS Figure 20. Receive Base band Processing Figure 20 is a functional diagram of the receive base band processing section. AUDIOTAPE (diversity audio) from the diversity reception controller is routed to two separate paths, depending on whether the audio is destined for an external device (control head, eternal modem, etc.) or for the internal 4-level FSK modem.
5.8 Power Amplifier Module [a [a \ bed > 0 POUT LN S5COMHZ LOW-PASS FILTER Figure 21. Power Amplifier Functional Diagram ETNA PWR AMPLIFIER Figure 21 is a functional diagram of the power amplifier. The transmit injection signal from the RF injection section is applied to a 1 watt amplifier. Following the amplifier, a 500 MHz low-pass filter reduces spurious and harmonic emissions.
6. RECOMMENDED TOOLS AND TEST EQUIPMENT 6.1 Recommended Tools Tem ECS Part Note Number Ceramic tuning tool 44010006 used to tune trimmer capacitors and potentiates Disengagement tool 44010008 used to disengage SMUT RF connectors #0 Phillips screwdriver used for 0-80 sized screw fasteners on boom cover #1 Phillips screwdriver used for 4-40 screws on and bottom cover and all PCB mounting screws #2 Phillips screwdriver used for 40 watt P.A.
7 INSTALLATION 7.1 Unpacking and Inspection Carefully unpack the data radio. It is recommended you verify the items shipped match the items ordered before discarding the packing material. Standard and optional items are listed below. If any damage has occurred during shipment, file a claim with the carrier immediately. Standard Equipment: . DT450 Mobile Radio with mounting brackets attached . Mounting hardware (4 ea number 10 self tapping screws) .
7.2 Installation Instructions It is recommended the installation be performed by qualified technicians familiar with two way mobile radio installation procedures. Contact your sales representative for a list of authorized installation facilities in your area. ont EU CAUTION Automotive ‘Electronics RF Susceptibility: Certain’ automotive electronic’ systems such as ABS (Anti-Skid Braking): systems; electronic fuel injection systems, electronic cruise ‘control . systems, electronic entertainment systems, ‘etc.
7.2.2 Installation Procedures Prior to installing the radio, it is recommended you ensure the following conditions are satisfied: . The radio will be securely mounted in a safe location (ensure the radio will not become a projectile in the event of a collision) . The radio will be located in an area free from standing water . The radio will be located in an area easily accessible to the radio technician . The radio will be located in an area which will not obstruct any automotive mechanisms .
The radio may be mounted vertically or horizontally. The position of the interface connector and the antenna connectors should always be considered carefully (right-angle antenna connectors can reduce the space requirements). Cables should be routed in a manner which ensures the cables will not be pulled or damaged in any way by cargo or passenger feet or any other mechanism.
EE A — WARNING FCC regulations require that the frequency and deviation of a transmitter must be checked “before it is placed into’ service ‘and’ re-checked at’ one year: intervals thereafter. FCC regulations also state that the ‘RE output power of a radio: transmitter ' shall be no more than that required for satisfactory: ‘operation . considering the -area robe covered and ‘focal conditions.
7.3 Antenna Considerations In general, the most important part of a radio is the antenna. This is particularly of the dual receiver, dual RF port, DT450. The unique architecture of the DT450 enables considerable operational flexibility; however, closely spaced antennas, and controlled antenna correlation require careful consideration. It is not practical to cover all possible situations; therefore, this section should be used as a guide to proper antenna configuration practices. 7.3.
objects (including other antennas) by a distance equal to the antenna’s near field given by the following formula: F,2d? A where: F, is the near field radius in inches, d is the length of the radiating element in inches, and A is the wavelength in inches. For example, a 5 dB gain antenna with a length of 33 inches will require an area free from objects extending 57 inches from the antenna in all directions.
8. MAINTENANCE AND ALIGNMENT PROCEDURES 8.1.1 Test Equipment Setup OSCILLOSCOPE oT AUD TEST TX AUD — sox { +i SERVICE g MONITOR o POWER o surely | © g 1a.gvoc) © 2 15a or period |B I C Bottom) or vem ona Figure 25. Test Equipment Setup The typical test equipment setup is illustrated in Figure 25. and should be used to perform functional tests and alignment procedures. It is recommended the troubleshooting flowcharts be used as the first sep in verifying proper radio operation.
8.2 RECOMMENDED TOOLS AND TEST EQUIPMENT 8.2.1 Recommended Tools Item ECS Part Note Number Ceramic tuning tool 44010006 used to tune trimmer capacitors and potentiates Disengagement tool 44010008 used to disengage SMUT RF connectors #0 Phillips screwdriver used for 0-80 sized screw fasteners on bottom cover #1 Phillips screwdriver used for 4-40 screws on and bottom cover and all PCB mounting screws #2 Phillips screwdriver used for 40 watt P.A, module removal and replacement 8.2.
8.3 Transmitter Alignment Procedure 26P000REEEOD reservations Figure 26. Transmit Adjustment PCB Locations 8.3.1 Injection Frequency Adjustment a. Select one of the six radio channels (0, 1,2, with the DT series test box and key the radio with the "PTT" switch. b. Using ceramic tuning tool, adjust Y3 for minimum frequency error.
622aEPeTOOI DY Figure 27. Transmit Adjustment PCB Locations (repeated for reader convenience) 8.3.2 Transmit Modulation Adjustment a. Inject a 1.0 Volt peak-to-peak 1.0 kHz audio test tone into "TX AUD" on DT series test box. b. While monitoring the service monitor, adjust potentiate RV2 for required system deviation. c. Inject a 1.0 Volt peak-to-peak 100 Hz audio test tone into "TX AUD" on DT series test box. d. While monitoring the service monitor, adjust potentiate RV1 to the same deviation as in step b.
8.4 Receiver Alignment werewolves aan ses wl Figure 28. Receiver #1 Adjustment PCB Locations 8.4.1 Receiver #1 Distortion and SIN AD Alignment a. Manually select receiver #1 and monitor "RX AUD" using DT series test box. b. Inject an on-frequency RF carrier signal at a level of -80 dBm modulated with a 1.0kHz test tone at 4.0kHz into receiver #1 RF port J2. ¢. Adjust trimmer capacitor CV to the center of its tuning range (reference schematic sheet 7). d.
USA-T7 3 = Fatal Figure 29. Receiver #1 Adjustment PCB LOCUTIONS (repeated for reader convenience) e. While monitoring the DC voltage at U8A pin 7, carefully adjust TAFT, then FT34A, then TAFT for maximum DC voltage at USA pin 7 (typically 2.6 VD. f. Reduce the RF level and verify minimum 12 dB sensitivity is within specification. g. Record 12 dB SIN AD RF level for DRC alignment purposes.
I= FLT — FLT / = wars 22 5 [ty Fam Figure 30. Receiver #2 Adjustment PCB Locations 8.4.2 Receiver #2 Distortion and SIN AD Alignment o Manually select receiver #2 and monitor "RX AUD" using DT series test box. b. Inject an on-frequency RF carrier signal at a level of -80 dBm modulated with a 1.0kHz test tone at 4.0 kHz into receiver #2 RF port J3. c. Adjust trimmer capacitor CV to the center of its tuning range (reference schematic sheet 12). d.
TTT! EEE Tomato Figure 31. Receiver #2 Adjustment PCB Locations Repeated for reader convenience) e. While monitoring the DC voltage at U8B pin 7, carefully adjust FT, then FT, then FT for maximum DC voltage at USB pin 7 (typically 2.6 VD. f. Reduce the RF level and verify minimum 12 dB sensitivity is within specification. g. Record 12 dB SIN AD RF level for DRC alignment purposes.
8.5 Diversity Reception Controller Alignment R140 Ean] Em aiE, Figure 32. RSI Alignment for Receiver #1 PCB Adjustment Locations 8.5.1 RSI Alignment for Receiver #1 Note: Receiver sensitivity must be measured and recorded in order to perform this alignment procedure. a. Inject an on-frequency, UN-meodulated RF carrier to RF port J2 with an amplitude equal to receiver #1's 12 dB SIN AD level. b. While monitoring TPI, adjust R110 to attain a level of 0.50 VDC at TP1 (reference schematic sheet 13 C7). Cc.
8.5.2 RSI Alignment for Receiver #2 ITT sacrosanctness vsasuvvoreess Figure 33. RSI Alignment for Receiver #2 PCB Adjustment Locations Note: Receiver sensitivity must be measured and recorded in order to perform this alignment procedure. a. Inject an on-frequency, UN-modulated RF carrier to RF port J3 with an amplitude equal to receiver #1’s 12 dB SIN AD level. b. While monitoring TP1, adjust R109 to attain a level of 0.50 VDC at TPL (reference schematic sheet 13 D7). c.
8.5.3 Receiver Audio Equalization R148 Figure 34. Receiver Audio Level Equalization PCB Adjustment Locations a. Using DT series test box, select "auto" and monitor receiver audio at "RX AUDI. b. Adjust R147 and R149 fully clockwise. c. Inject an on-frequency RF signal at a level of -80 dBm, modulated with 1.0 kHz test tone at a level of 4.0kHz deviation into RF port J2 (receiver #1). d. Record receiver audio level. e. Inject an on-frequency RF signal at a level of -80 dBm, modulated with a 1.
Transmitter Troubleshooting Flowchart TRANSMITTER FUNCTIONAL TEST START A APTLY Kez @ OVER TEST TONE TO “TX AUD PHAT On OT TEST 2OX Ts > Evergreen With In 2 200Hz OF ASSIGNED FRENEMY WHEN KEYED? DUST 3 REFER TO SECTION ©.
9.2 Receiver Troubleshooting Flowchart RECEIVER FUNCTIONAL TEST SELECT RX1 ANG MONITOR “RX ALD OM DT TEST 80x MEASURE RECEIVER #1 1248 SIN AD ANC ©: STORY iON 1S RECEIVER 27 SENSITIVITY TO PEG 7? YES ~ SEAFLOOR DRG AL) GARMENT sore me PERT TRY Tee aon as Ra ACE I VER ALIGNMENT . SECTION TEST BOX RETURN EOH Factory REFER TO SECTION §.
9.4 Diversity Reception Controller Audio Level Troubleshooting Flowchart DIVERSITY RECEPTION CONTROLLER AUDIO LEVEL TEST SELECT “AUTO OM DT TEST BOX NEGLECT -DOB RF SIGNAL ONLY TO 2X #1 AND RECORD AUDIO LEVEL INJECT -ICBM RF SIGNAL ONLY TO fix #2 AND RECORD AUDI LEVEL PERFORM AUD !O LEVEL EQUALIZATION REFER TH SECTION 8.
10 GLOSSARY BASE BAND BESSEL FILTER COS CPM CSS DES PROMOTE EMI ™ FSK 4-LEVEL FSK IMAGE FREQUENCY A signal whose frequency content is centered around DC (or 0 frequency) A filter with a linear phase response. Complementary Metal Oxide Semiconductor A type of integrated circuit with low power consumption. Continuous Phase Modulation, a family of modulation schemes in which no phase discontinuities are present.
HALF DUPLEX LNA NOISE FIGURE PCB PHASE NOISE PLL PPM PROM RCS RF RFI SIN AD SMT SNR TCVCXO process. A dual frequency mode of operation which inhibits simultaneous transmission and reception. Low Noise Amplifier The "Figure of Merit” of an amplifier. Specifically, noise figure is a measure of the degradation in SNR between the input and output ports of a network.
Oscillator TRANSMIT ATTACK TIME The elapsed time from transmit key assertion to 90% rated RF power is achieved. UHF Ultra High Frequency, the frequency band from 300 to 3,000 MHz vCo Voltage Controlled Oscillator an oscillator whose frequency can be adjusted by a DC control voltage.