3492 SYNTHESIZED 900 MHZ TRANSCEIVER SERVICE MANUAL Copyright® 1997 by the Johnson Data Telemetry Corporation. The Johnson Data Telemetry Corporation designs and manufactures radios and radio modems to serve a wide variety of data communication needs. The Johnson Data Telemetry Corporation produces equipment for the fixed data market including CICADA systems for utilities, petrochemical, waste and fresh water management markets and RF boards for OEM applications in the Radio Frequency Data Capture market.
TABLE OF CONTENTS GENERAL INFORMATION DL3492 WITH LOADER BOARD . DL3492 WITH MODEM. L122 DM3492 SYNTHESIZER PROGRAMMING .. TRANSCEIVER IDENTIFICATION . ACCESSORIES . . C12 PART NUMBER BREAKDOWN FACTORY CUSTOMER SERVICE . PRODUCT WARRANTY REPLACEMENT PARTS. FACTORY RETURNS INSTALLATION PER-INSTALLATION CHECKS .INTERFACING WITH DATA EQUIPMENT . DM3492 (RF Board) PROGRAMMING INTRODUCTION L331 DM3492 SYNTHESIZER DATA PROTOCOL . 3-1 L331 SYNTHESIZER DATA. .
TABLE OF CONTENTS RECEIVER CIRCUIT DESCRIPTION ces oes CERAMIC FILTER, RF AMPLIFIER . . CRYSTAL FILTER, FIRST IF SECTION SECOND LO/MIXER/DETECTOR 46 DRIVER TRANSMIT KEY-UP CONTROL. VOLTAGE REGULATORS... .. . +9.6 AND +5.5V REGULATED SERVICING GENERAL PERIODIC CHECKS . cee 51 SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS on 51 REPLACEMENT PARTS 5-1 OTC MODULE NOT SERVICEABLE . , . SYNTHESIZER SERVICING . . L540 INTRODUCTION oii CRYSTAL FILTERS pees -. 53 MIXER u. . 53 LOW NOISE AMPLIFIER (ULNA, ..
TABLE OF CONTENTS ALIGNMENT PROCEDURE GENERAL TEST EQUIPMENT C6 INITIAL SETTINGS . Lo 6 VCO CONTROL VOLTAGE... .. .. 61 TRANSMITTER AND FREQUENCY .
SECTION 1 GENERAL INFORMATION 1.1 SCOPE OF MANUAL This service manual contains alignment and service information for the JDT DM3492 900 MHz Synthesized Telemetry Unit. This manual concentrates on the RF section of the data link which may be paired with an internal Loader board or 9600 baud Modem board. Service manuals addressing items specific to the Loader board (001-3240-001) and the Modem board {001-3276-001) should be referenced for the users specific configuration, 1.2 EQUIPMENT DESCRIPTION 1.2.
RAL INFORMATION OTE: The synthesizer must be loaded each time pow is turned an. Therefore, one loader board or customer supplied programming circuit is required for ch data transceiver. 2.3 DL3492 WITH MODEM The DL3492 (Part No. 242-3492-5x0) includes e 9600 baud Modem (Part No. 023-3276-001), his supports the RNET™ communication proton, allowing data communication between the chanson Data Telemetry high specification synthesized products and the Motorola RENT radio/ odes.
1.6 FACTORY CUSTOMER SERVICE The Customer Service Department of the Johnson Data Telemetry Corporation provides customer assistance on technical problems and the availability of local and factory repair facilities. Customer Service hours are 7:30 a.m. 4:30 p.m. Central Time, Monday Friday. There is also a 24-hour emergency technical support telephone number.
ENTERAL INFORMATION Be sure to fill out a Factory Repair Request Form 271 for each unit to be repaired, whether warranty. These forms are available free of rage by calling the repair lab (see Section 1.6) or by questing them when you send a unit in for repair. early describe the difficulty experienced in the ace provided and also note any prior physical dame to the equipment. Include a form in the shipping maintainer with each unit.
GENERAL INFORMATION 3492 UHF SYNTHESIZED TELEMETRY UNIT SPECIFICATIONS The following are general specifications intended for use in testing and servicing this transceiver. For current advertised specifications, refer to the specification sheet available from the Marketing Department. Specifications are subject to change without notice.
r MINERAL INFORMATION TRANSMITTER frequency Stability bandwidth maximum System Deviation frequency Spread modulation tideland Data Input Bias arrow Band Input put Impedance audio Distortion audio Response aptness F Power Output aviation Symmetry * Output Impedance ity Cycle transmitter Adjacent Power er modulation Attenuation curious and Harmonic FM 1 Hum and Noise 1997 No. (01-3492-001 11.5 PPM from -30°C 10 +60°C (-22°F to +140°F) 32 MHz 5 kHz (25 kHz Channel), 2.5 kHz (12.
SECTION 2 2.1 PER-INSTALLATION CHECKS Field alignment should not be required before the 3492 is installed. However, it is still good practice to check the performance to ensure that no damage occurred during shipment. Performance tests are located in Section 6.2. 2.2 INTERFACING WITH DATA EQUIPMENT 2.2.1 DM3492 (RF Board) Connector J201 on the data transceiver PC board provides the interface with the data equipment. This is a 14-pin female connector with .025" square pins on 0.1" centers (DuPont 76308-114).
SECTION 3 PROGRAMMING 3.1 INTRODUCTION DM3492 The information in Section 3.2 describes synthesizer programming protocol. This information can be used as a basis for designing the synthesizer programming hardware and software required. 3.2 DM3492 SYNTHESIZER DATA PROTOCOL 3.2.1 GENERAL The 928-960 MHz band is divided into two segments for the purpose of reducing VCO gain. The "LOW?" band covers the 928-944 MHz segment and the "HIGH" band covers the 944-960 MHz segment.
PROGRAMMING 2.4 C-WORD CALCULATION (24 BITS) ‘The C-Word enables the auxiliary scalper, and 2ts the auxiliary divide ratio for the secondary (Send LO) loop {refer to Figures 3-4 and 3.7). A=0 Sets aux scalper mode =437 (0xIB5) Auxiliary divide ratio 87.4 MHz + (4x 437) = 50 kHz -Word = 0x91 oxbows 0x00 2.5 B-WORD CALCULATION (24 BITS) The B-Word programs the Fractional-N charge ump current setting factor. The Binary acceleration tors (CL/CK) and scalper type (modulus 3).
NM3 = (INT(64 x FRANC [N + 64]) (INT(64 x 0.59375) =(INT(38 =4-1 =3 PROGRAMMING 3.2.7 TX/RX FREQUENCY SHIFT AND BAND SELECTION As mentioned in 3.2.2, in order to implement the band selection and Rx/Rx an additional 8 bits of data are added to each of the synthesizer load words (D/C/ BRAQUE) (see Figure 3-1). The frequency bands and NM2 = 8x FRANC [N + 8] Transmit/Receive Bits are defined as follows: =8x0.
PROGRAMMING PT TT Ajo] ~F NML NM3 NM? LEAK iri riyal I LLL Cli TTT T I Djt ero 111 [°fe comfy 0 [111d ADDRESS BITS TEST BITS NOTE: E-Word not used in Synthesizer load. Figure 3-6 SERIAL INPUT WORD FORMAT Bom mom nm a mam wm mom Miss sao = UII U III ~ Ir Figure 3-7 DIAGNOSTIC SERIAL DATA STREAM June 1997 3-5 Part No.
PROGRAMMING .8 RADIO DIAGNOSTICS The diagnostic features allow the user to program digital-To-Analog Converter (DAC) to adjust RF put power and modulation flatness without theorem radio from the enclosure. Bit "a0" can be set provide an analog voltage representative of the ford and reverse RF power at the radio interface contort J201, pin 14. This feature can be used to monition condition of the transceiver and antenna/ dine.
4. For quickest lock times the SYNTH ENABLE line on the last load word should be held high for 2 to 3 milliseconds. It Must NOT be left high as the synthesizer in the SPEEDUP mode has poor noise performance and would degrade the Receive performance.
SECTION 4 CIRCUIT DESCRIPTION 4.1 GENERAL 4.1.1 INTRODUCTION The main sub assemblies of this transceiver are the RF board, VCO board, OTC, Loader board or Modem. A block diagram of the transceiver is located in Figure 4-1. The 3492 is also available in Transmit only and Receive only models. The 3492 has a reference oscillator stability of +1.5 PPM. The 17.5 MHz OTC (Temperature Compensated Crystal Oscillator) is soldered directly to the RF board. The OTC is not serviceable. 4.1.
42.1 VOLTAGE-CONTROLLED OSCILLATOR Oscillator The VCO is formed by QB, several capacitors and var actor diodes, and ceramic resonator L826. It oscillates at the transmit frequency in transmit mode and first injection frequency in the receive mode (928960 MHz in transmit and MHz in receive). Biasing of Q820 is provided by R823, R824 and R826. An AC voltage divider formed by C844 and C845 initiates and maintains oscillation and also matches Q820 to the tank circuit.
[CIRCUIT DESCRIPTION capacitance that is multiplied. If a noise pulse or other gate change appears on the collector, the base volt does not change significantly because of C842. \ere fore, base current does not change and transistor rent remains constant. CR840 decreases the charge ne of C842 when power is muted on. This shortens e start-up time of the VCO. C840 and C841 are RF coupling capacitors. 2.
4.2.7 SYNTHESIZER INTEGRATED CIRCUIT {Usu) Introduction Synthesizer chip U800 is shown in Figure 4-2, This device contains the following circuits: R (reference), Fractional-N, NMI, NM2 and NM3; phase and lock detectors, scalper and counter programming circuitry. The basic operation was described in Section 4.2.1. Channel Programming Frequencies are selected by programming the R, Fractional-N, NM1, NM2 and NM3 in U800 to divide by a certain number.
CIRCUIT DESCRIPTION 3.4 CRYSTAL FILTER, FIRST IF SECTION Z220 and Z221 form a 2-section, 4-pole crystal It er with a center frequency of 87.85 MHz and a 3 dB pass band of 8 kHz (12.5 kHz BW) or 15 kHz 25 kHz BW). This filter establishes the receiver selectivity by attenuating the adjacent channel and thee signals close to the receive frequency. C223, 224, and L221 adjust the coupling of the filter, 222, C226, C227 and R223 provide impedance watching between the filter and U230. .3.
4.4 TRANSMITTER CIRCUIT DESCRIPTION 4.4.1 DRIVER ‘The VCO RF output signal is applied to R846, R847 and R848 that form a resistivity splutter for the receive first local oscillator and the transmitter. The VCO signal is then applied to a 50 ohm pad formed by R500, R501, and R502. This pad provides attenuation and isolation. Q500 provides amplification and additional isolation between the VCO and transmitter.
CIRCUIT DESCRIPTION Q130, Q131 and Q132 act as switches that tum 1 with the RX_EN line. When J201, pin 4 goes low, 130 is turned off, which turns on Q131 that turns on 132. This applies +13.3V to U130 before the XENON line on J201, pin 3 goes high. U130B provides the condition circuit, C141/R137 provide a ramp up/ramp down the +9V TX during which dices load pull of the VCO during key-up. ‘The output on U130B, pin 7 is applied to the converting input of comparative U130D, pin 12.
SECTION 5 SERVICING 5.1 GENERAL 5.1.1 PERIODIC CHECKS This transceiver should be put on a regular maintenance schedule and an accurate performance record maintained. Important checks are receiver sensitivity and transmitter frequency, modulation, and power output. A procedure for these and other tests is located in Section 6. It is recommended that transceiver performance be checked annually even though periodic checks are not required by the FCC.
SERVICING control Voltage Check the DC voltage at C815 with a channel zar the center of the band. [f the VCO is locked on frequency, this should be a steady DC voltage near not locked on frequency, it should be near e lower or upper end of its range (OV or 5.5V). output Frequency Check the VCO frequency at R841. If the VCO locked on frequency, it should be stable on the transmit channel frequency. If the VCO is not locked 1 frequency, the VCO control voltage is probably ear OV or 5.5V. 2.
5.3.3 SECOND LO Verify that the Second LO signal is present at R245. The Second LO should be at 87.40 MHz and not less than 250 mV P-P. 5.3.4 AUDIO BUFFER AMP The Data output on J201, pin 13 should be 100200 mV RMS, with the preceding injection signal. If these levels are not correct, verify proper adjustment of L230 (see Section 6.7). The gain of U230 is 2.8 for 25 kHz radios and 5.8 for 12.5 kHz radios. 5.3.5 CRYSTAL FILTERS The 87.85 MHz IF signal is provided to the crystal filters 2220/2221. 5.3.
SERVICING 4.5 MODULATION INPUT Check for audio/data signals at J201, pin 6, Y800, pin 1 and A840, pin 3. 4.6 OTC Check Y800, pin 1 for 2.5V DC 1%. Adjust Y800 to set the transmitter to the frequency of operation. If the frequency cannot be set to the frequency of operation, replace the OTC. MEASURE SECTION 5.40) CHECK AUDIO REEK 10 . macro SECTION $0.2 "CHECK FREQUENCY (SECTION 547) REFER TI SECTION $4.4 ANTENNA SWITCH Figure 5-2 TRANSMITTER SERVICING ne 1997 ire No.
SECTION 6 ALIGNMENT PROCEDURE 6.1 GENERAL Receiver or transmitter alignment may be necessary if repairs are made that could affect tuning. Alignment points diagrams are located in Figure 6-5 or component layouts are located in Section 8. Fabricate test cables by referring to Figure 2-1. This cable should include power and ground, a transmit keying switch that shorts the keying line to ground, data input and data output.
ALIGNMENT PROCEDURE 5.1 MODULATION ALIGNMENT Apply a 1V, 100 Hz square-wave to J201, pin 6. Transmit into the modulation analyzer and observe modulation output on the oscilloscope. Set the modulation analyzer high pass filtering OFF and no less than a 15 kHz low pass filter. Preset R818 to the center position. Load the synthesizer with a channel frequency at the MIDDLE of the band. Adjust R818 for a flat square wave. Apply a 100 Hz sine-wave to J201, pin 6.
. Repeat Step 5 for channels on the LOW and HIGH ends of the band. . Power output should be (50% duty cycle) and current should be less than 2.5A. 8. Select a Transmit channel frequency in the MIDDLE of the band . Adjust the frequency displayed on the Modulation Analyzer to the desired channel frequency by adjusting the OTC (Y801). 6.6.1 MODULATION ADJUSTMENT 1. Apply a 1V, 100 Hz square wave to J201, pin 6. 2. Transmit into the modulation analyzer and observe modulation output on the oscilloscope.
ALIGNMENT PROCEDURE Load the synthesizer with a receive channel frequency at the MIDDLE of the band. Apply a-47 dBm signal from the RF signal generator to J501 on the radio. Adjust deviation for: 1.5 kHz with 1 kHz tone for 12.5 kHz radios 3 kHz with 1 kHz tone for 25 kHz radios. OTE: Maintain these deviation levels throughout the st when measuring AC levels, SIN AD and % distortion, unless otherwise instructed. Preset L230 for 2.5V DC £0.05V at J201, pin 13. Set RF signal generator to -105 dBm, modulated.
ALIGNMENT PROCEDURE omen & » Communications Figure 6-4 Rx WITH LOADER TEST SETUP sso | B40 3 A840 Y800 5 2231] 2230 1201 L230 o L212 L222 C223 —] fusion — Figure 6-5 ALIGNMENT POINTS DIAGRAM June 1997 6-5 Part No.
TRAS LIST 'MOL BIMBER 139 140 141 148 200 201 202 203 205 212 213 214 215 223 230 231 232 233 234 240 241 242 243 244 245 246 247 248 249 250 260 261 262 263 264 265 266 267 500 501 502 503 504 DESCRIPTIO 470 ohm £5% 0.063W 0603 3.6k ohm £5% 0.063W 0603 5.6k ohm £5% 0.063W 0603 10k ohm +5% 0.063W 0603 12k ohm £3% 0.063W 0603 39k ohm £5% 0.063W 0603 300 ohm 5% 0.063W 0603 39k ohm 5% 0.063W 0603 2.2k ohm £5% 0.063W 0603 10 ohm %5% 0.063W 0603 1k ohm #5% 0.063W 0603 10k ohm £5% 0.063W 0603 160 ohm £5% 0.
SYMBOL NUMBER R 848 R 349 R900 R901 R911 Ro1R2 R913 R914 Silo Lull U130 uU230 uso Usu U 800 U 840 U 900 undue U 902 Y 800 Z 200 7201 7220 7220 Z221 Z221 2230 Z230 Z231 Z231 DESCRIPTION 24 ohm £5% 0.063 W 0603 24 ohm £5% 0.063W 0603 10k ohm £5% 0.063W 0603 10k ohm £5% 0.063 W 0603 10k ohm +5% 0.063 W 0603 47k ohm £5% 0.063W 0603 47k ohm £5% 0.063 W 0603 1k ohm £5% 0.
ARTS LIST SYMBOL LUMBER DESCRIPTION ) 820 ) 821 ) 822 ) 823 820 821 822 823 824 825 826 . 827 830 831 832 833 835 836 840 842 843 NPN transistor NE85619 NPN transistor NE85619 NPN transistor NE85619 NPN transistor NE83619 10k ohm +5% 0.063W 0603 100 ohm +5% 0.063W 0603 10k ohm £5% 0.063W 0603 10k ohm £5% 0.063 W 0603 3.3k ohm =5% 0.063W 0603 10 ohm £5% 0.063 W 0603 150 ohm £5% 0.063W 0603 10 ohm +5% 0.063W 0603 4.3k ohm +5% 0.063W 0603 5.6k ohm =35% 0.063W 0603 3k ohm 5% 0.063W 0603 200 ohm £5% 0.
DL3286 4-LEVEL 9600 Bps MODEM SERVICE MANUAL 3286 9600 / 4800 BPS PROGRAMMABLE 4-LEVEL FSK MODEM PART NO. 242-40VW-WYZ Copyright© 1998 by the Johnson Data Telemetry Corporation.
TABLE OF CONTENTS Section 1 GENERAL INFORMATION Title Number 1.1 SCOPE OF MANUAL 1.2 INTRODUCTION 1.2.1 GENERAL 1.4 FACTORY CUSTOMER SERVICE . JP LS PRODUCT WARRANTY oii ie LE REPLACEMENT PARTS. ooh 1-3 FITFUL A PROBLEM ARISES 1.7.1 Factory Repair FR DL~3286 SPECIFICATIONS iin, 1-5 GENERALIZE ties ee 2-1 L021 aaa 2-1 2-2 S22 ..23 2.2.5 TRANSMIT DEVIATION LEVEL ADJUSTMENT . 22.6 RECEIVE LEVEL ADJUSTMENT . 22.725 VDC LEVEL ADJUSTMENT ooh inch, 2-3 Section 3 PROGRAMMING GENERALIZE 31 3-1 3.1.
TABLE OF CONTENTS 322 EDIT 3.2.3 EDIT FREQUENCIES WINDOW 3.2.4 UTILITIES 3.2.5 PROGRAM CODE 32.6 PRODUCTION TEST 3.2.7 SETUP PRODUCTION FREQUENCIES . 3-11 328FKEY FUNCTIONS aa 3.12 3.2.10 ENGINEER SZ AL WINDOW. otter rears aa vac ranee 4.1 INTRODUCTION 4.1.1 GENERAL 42 INTERFACE 4.2.1 INTERFACE DESCRIPTION . 4.2.2 FLOW CONTROL PROTOCOL 4.2.3 RESTRICTS HANDSHAKING PROTOCOL 4.3 DIAGNOSTICS GENERALIZE 4.3.2 HARDWARE DIAGNOSTICS 4.3.3 NETWORK DIAGNOSTICS MISCELLANEOUS LL...
TABLE OF CONTENTS List of Figures Figure/Title Page Number 2-1 3286 Programming Software Screen. .. 2-2 3286 Modem Board 3-1 Main Window 23-1 3-2 Edit Radio Types Window. . 3-3 Edit Frequencies Window . . 3-4 Advanced Radio Frequencies Window 3-6 3-5 Communication Settings Window. . 3-7 3-6 Edit Radio Specifications Window 3-8 3-7 Production Test Window 3-9 3-8 3-11 3286 Modem Board Component Layout (T op) 6-2 3286 Modem Board Component Layout (Bottom) 6-3 3286 Modem Schematic ii net iii Part No.
TABLE OF CONTENTS List of Tables Table/Title Page Radio Type/Frequency Range .. 3-2 Tx Modes 3-3 Dysfunctions iii iia »; Harrison Part No.
SECTION 1 GENERAL INFORMATION 1.1 SCOPE OF MANUAL 1.1.1 INTRODUCTION This manual contains setup and service information for the Johnson Data Telemetry (JDT) FL-3286 Telemetry Modem. For servicing information on the 3400-series telemetry radios which may be used with this modem, refer to the specific transceiver service manual, 1.2 MODEM DESCRIPTION 1.2.1 GENERAL The function of a modem is to convert digital data to an analog signal which can be used to modulate an RF carrier.
GENERAL INFORMATION 1.3 ACCESSORIES Accessories available for the 3286 Modem are listed in Table 1-1. To order accessories by phone, dial the toll-free number and enter "3" (see Section 1.4). The Sales Fax number is 507-835-6648 or orders may be sent by mail (see JDT address in Section 1.4). Table 1-1 ACCESSORIES Description Part No.
GENERAL INFORMATION With a touch-tone type telephone, you may also enter the 4-digit extension number of the person that you want to reach if you know what it is.If you are calling from outside the continental United States, the Customer Service telephone numbers are as follows: Customer Service Department (507) 835-6911 Customer Service FAX Machine (507) 835-6969 You can contact the Customer Service Department by mail. Please include all information that may help solve your problem.
GENERAL INFORMATION 1.7.1 FACTORY REPAIR Component level field repair is not recommended on the 3286 modem. Surface mount technology is used to install many components. Those components require specialized training and equipment to service. DDTs factory is best equipped to diagnose problems and make repairs. When returning equipment for repair, fill out a Factory Repair Request Form for each unit to be repaired regardless of warranty status.
GENERAL INFORMATION FL-3286 SPECIFICATIONS The following are general specifications intended for use in testing and servicing this Modem. For current advertised specifications, refer to the specification sheet available from the Marketing Department. Specifications are subject to change without notice.
GENERAL INFORMATION This page intentionally left blank. DATA TELEMETRY chanson "A Paradise Company Part No.
SECTION 2 SET UP AND ALIGNMENT 2.1 GENERAL 2.1.1 INTRODUCTION This section contains set-up and alignment for the Johnson Data Telemetry (JDT) DL3286 Modem. For servicing information oni the 3400-series telemetry radios which may be used with this modem, refer to the specific transceiver service manual. 22 SETUP 2.2.1 GENERAL The 3286 Modem is factory aligned and should not require adjustment in the field.
SETUP AND ALIGNMENT 2.2.4 8 POSITION DIP SWITCH S100 The first 3 DIP switches (1 3) are for selecting the desired channel (Table 2-1). The last DIP switch (8) is for putting the modem into setup mode (Table 2-2). For more information on programming channels see Section 3. Table 2-1 Channel Selection CHANNEL Table 2-2 Setup Mode Setup Mode ON Operating Mode FF 2.2.
SETUP AND ALIGNMENT Utilities Program Code Production Test Engineer Emile Edit Diagnostics: Voltage: Current: R551 Voltage: Forward Power: ll Rx Frequency: Tx Frequency: [460.
SETUP AND ALIGNMENT Ea) TP 200 RX level adjust SL 0 R410 S100 Q Co) 1GHHTaE] O OFF TEI Eh “Channel Select” Test Mode 2.5 VDC Adjust TP400 ° N, TP5020 © TP500 [] J R632 R508 SS © P60 TX Deviation adjust C ooocoosocoooso O 90 00 O0¢ POI O S102 Jie Oo 22 Johnson A Data radio Company Figure 2-2 3286 Modem Board 24 Part No.
SECTION 3 PROGRAMMING 3.1 GENERAL 3.1.1 INTRODUCTION This section describes the use of the DL3286 Programming software. The programming parameters are factory installed with default parameters. Programming information is stored in an PROMOTE in the modem’s microprocessor. Desired, radio parameters, frequency and file changes are made using the 3286 Programming software (part number 023-9998-001) and the programming/power cable (part number 023-3286.
PROGRAMMING Figure 3-1 Main Window 3.2 3286 WINDOWS This window provides access to pull-down menu options. 3.2.1 FILE Data files contain the information for frequency programming and allow the user to install previously defined configurations.
PROGRAMMING ® Radio Type Toggles through the available radio types (3412, 3422, 3492) Radio Type: Radio Range: Freq Steps. Enable Pwr LED {Gm) Enable CD LED {Yell: Enable Tx LED (edt Tu-Only Radio: 0 Modem Parameters Protocol [Flow Control (FEC) Half Speed: Oo Figure.
PROGRAMMING Frequency Steps Toggles through frequency step sizes 2.5 kHz, 5 kHz, 6.25 kHz, and 7.5 kHz NOTE: Frequency step size will not effect the functionality of the transceiver/modem. This is just a check for the user to verify the selected frequency is the desired step size. Example: If the user is operating on a 6.25 kHz system and enters a 7.5 kHz frequency, an error message will be displayed but the 3286 software will load the 7.
PROGRAMMING 3.23 EDIT FREQUENCIES WINDOW Figure 3-3 Edit Frequencies Window ® Receive and Transmit Frequencies There are a maximum of § pairs of channels (8 Rx and 8 Tx) that can be programmed into the modem. Channel frequencies can be copied from one channel to another by double clicking on the desired frequency, holding the right mouse button, dragging and dropping the data to the channel to be changed. ? The Power, and Tx Mod values are all set to factory settings.
PROGRAMMING ERE ET Ede Edit Utilities Program Code Production Test Insetting Window Help REEL ACT Jig x] Frequency vanned Chan: Rawer, Tx Mod: [@Factory | [@Faction || @Facility || © Factor : | Eventide {| Override || Override [| Eventide [Officious || @Facility | [Factory || CF Factory Eventide || Override || Override || Override [Focal | [Faction proctor || OF actor Override || Override || Override || CO Override [Factory |[SFaclony |[BFecioy || Factory : | Provender || Override || © Override k Figure 3.
PROGRAMMING 3.2.4 UTILITIES eo Communication Settings Sets parameters for Com Port and Baud Rate for communication between the PC and the modem. Sets parameters for primary and secondary receive and transmit modes. 3286 Programmer Com Port: Com Port: Baud Rate: Baud Rate: | Data Bits: Parity: Stop Bits: Stop Bits: DTH Enable: DTR Enable: . | Value Value SYNC Value (in Hex): CTS Timeout (x S0mS}: | ESC Value fin Hex): A 37 DATA TELEMETRY | Fart No.
PROGRAMMING n Setup Default Radio Frequencies und CNs ox: Exit and Save RB . Cancel: Exit and Don't Save Chan Pai: Ax Frequency: Tx Frequency: Low: 380. | [380.008800 | |o6 86 Mid: | 1391.5008008 98 88 High: | 180 20 ie Figure 3-6 Edit Radio Specifications Window «Edit Radio Specs Resets default radio frequencies. 3.2.5 PROGRAM CODE ® Program Code To install a new version of firmware, the modem must be taken out of it’s case. Short the two pins of J102 and cycle power (see Section 2, Figure 2-2).
PROGRAMMING Er MN Production Test Radio: Freq Pair: Range: Rx Frequency: Tx Frequency: 460.
PROGRAMMING e Tx Mode Table-2 Tx Modes Tx Mode Description symbol Sync [Carrier is modulated with sine wave Full-Speed 1.2 kHz sine wave Half-Speed 600 Hz sine wave dom Data Carrier is modulated with random data ‘est Data Carrier is modulated with test data are Wave [Carrier is modulated with 2 100 Hz square lo Modulation [Carrier tone with no modulation # Dias. En Enables diagnostics # Protocol Selects the protocol between the PC and modem.
PROGRAMMING 3.2.7 SETUP PRODUCTION FREQUENCIES Some of the same functions appear in the Edit Frequencies window as in the Edit Radio Specs. window (see Figures 3-6 and 3-8). per 412 Enable Pwr LED: Heat Run Times (in 5) . Enable CD LED: T: . | Range: [5 Enable Tx LED: x [5.000 Rx [5.900 Default DAC Adj Values J Chan Rx Frequency Frequency Rx TX Pwr Mod Front-End 459, 008000 | |459. | [96 86 150 { 165 74 Mid: [460.6808080 | 468. 080060 | jo8 88 158 | {90 127 High: |470.000800 | [v70.
PROGRAMMING 3.2.8 FEY FUNCTIONS Table 3-3 F Key Functions F Key Function Description F2 Auto Front-End Adjust | Automatically tunes front end filters of receiver {unable front-end currently available on FL-3422) F3 Initial Tune Settings | Sends default settings to modem for Pwr, and Tx Mod.
SECTION 4 3286 PROTOCOL 4.1 INTRODUCTION 4.1.1 GENERAL The specifications is Section 4 describe the requirements for the FL-3286, a 9600 bps half-channel or 19200 full-channel 4-level FSK Modem. 4.2 RTU INTERFACE 4.2.1 INTERFACE DESCRIPTION The RTU Interface is an RS232 connection. The data format will be § data bits, 1 start bit, 1 stop bit and no parity. The baud rate is programmable (19200 / 9600 / 4800 baud) with the 3286 Setup Software (2 Windows® based program.
PROTOCOL Figure 4-1 RTU Data Controlled by CTS Signal Figure 4-2 Absence of CTS Signal in Small Packet Use 4.2.3 RESTRICTS HANDSHAKING PROTOCOL ‘When the RESTRICTS Handshaking protocol is used, the modem will send raw data containing NO Forward Error Correction information. with this protocol, the Modem CAN NOT be programmed to expect an ACK or BACK for each packet sent. This is the protocol used by the JOT 3282 and 3276 Modems.
PROTOCOL 4.3 DIAGNOSTICS 4.3.1 GENERAL The 3286 Modem is capable of tracking different hardware (voltages) and network (modem) diagnostics. These diagnostics are available locally via the RS232 Interface and remotely via an RF link. Local diagnostics are available only while the modem is in the setup mode. Remote diagnostics are available anytime, provided there is a master modem connected to a PC running the Setup Software. 4.3.
PROTOCOL 4.3.4 MISCELLANEOUS The 3286 Modem is capable of sending and receiving data at two different speeds. This could be used to automatically change to the lower speed (if necessary.) The half-channel modem has a high speed of 9600 bps and a low speed of 4800 bps. Some programmable parameters are: e Number of re-tries (for modem setup to receive an ACK for each packet) ® Ability to change baud rates automatically (for modem setup to receive an ACK for each packet) . .
SECTION 5 CIRCUIT DESCRIPTION 5.1 GENERAL 5.1.1 INTRODUCTION The modem board (Part number 023-3286-001) is a plug-in circuit board. The three main functions of the modem board include loading the synthesizer, providing the base band modulating signal for the transmitter, and demodulating receive audio signals. The modem board is programmed by a personal computer and software and connects to the radio through a 14-pin connector, J100.
CIRCUIT DESCRIPTION 5.1.5 POWER SUPPLIES U604 provides 5.5V for the receiver 5.5REG and analog modem circuitry, while U602 provides 5V for the CPU and other digital logic. 5.1.6 MISCELLANEOUS FUNCTIONS An error condition (when the logic voltage regulator goes out of regulation) resets the processor. U606 is a temperature sensor used by the firmware to compensate for variations in RSI.