SYNTHESIZED VHF TELEMETRY UNIT PART NO. 242-3422-XYLEM 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.
TABLE OF CONTENTS GENERAL INFORMATION DL3422 WITH LOADER BOARD DM3422 SYNTHESIZER PROGRAMMING . . TRANSCEIVER IDENTIFICATION . ACCESSORIES PART NUMBER BREAKDOWN FACTORY CUSTOMER SERVICE . he PRODUCT WARRANTY oo REPLACEMENT PARTS cas FACTORY RETURNS i Ll 7 Gal 2 INSTALLATION PER-INSTALLATION CHECKS INTERFACING WITH DATA EQUIPMENT . DM3422 ONLY D-WORD . C-WORD B-WORD A-WORD .. RECEIVE TO TRANSMIT SEQ 3-4 TRANSMIT TO RECEIVE SEQUENCE owe 34 CIRCUIT DESCRIPTION GENERAL INTRODUCTION . SYNTHESIZER . TRANSMITTER .
TABLE OF CONTENTS TRANSMITTER CIRCUIT DESCRIPTION . BUFFER (Q501) Tan PER-DRIVER (QS11) 0 a FINAL (US31), COMPARATIVE (BULIMIC) [7 a7 ANTENNA SWITCH (CR561, CR562). . . 48 TRANSMITTER KEY-UP CONTROL VOLTAGE REGULATORS... . +9.6 AND +5.5V REGULATED . . SERVICING SURFACE-] MOUNTED COMPONENTS. PN SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS . REPLACEMENT PARTS LIST. SYNTHESIZER SERVICING INTRODUCTION REFERENCE OSCILLATOR CO. SYNTHESIZER (US11). .
SECTION 1 GENERAL INFORMATION 1.1 SCOPE OF MANUAL This service manual contains alignment and service information for the Johnson DM3422 VHF Synthesized Telemetry Unit. 12 EQUIPMENT DESCRIPTION 1.2.1 GENERAL The Johnson DM3422 is a synthesized data transceiver (transmitter and receiver) which operates in the 132-174 MHz VHF frequency range. Transmitter power output is 1-5 watts, SW at 13.3V nominal, and operation is simplex or half duplex.
ENTERAL INFORMATION 5 PART NUMBER BREAKDOWN You may also contact the Customer Service Department by mail. Please include all information The following is a breakdown of the part number that may be helpful in solving your problem. The ed to identify this transceiver: mailing address is as follows: RS ry Johnson Data Telemetry Corporation 42-3422-XYLEM Customer Service Department LL 2 Fat 29% Johnson Avenue | = 15 kia BW P.O. Box 1733 3 30 kHz BW Case, MN 56093-0833 4= 132-150 MHz $= 150-174 MHz 1.
1.9 FACTORY RETURNS Repair service is normally available through local authorized Johnson Data Telemetry Land Mobile Radio Service Centers. If local service is not avail. able, the equipment can be resumed to the factory for repair. However, it is recommended that You contact the Field Service Department before returning equipment. A service representative may be able to suggest a solution to the problem so that rectum of the equipment would not be necessary.
GENERAL INFORMATION 3422 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.
ENTERAL INFORMATION TRANSMITTER frequency Stability 42.5 PPM from -30°C to +60°C (-22°F 10 +140°F) bandwidth 132-150 MHz, 18 MHz without tuning 150-174 MHz, 24 MHz without tuning maximum System Deviation 5 kHz (30 kHz), 2.5 kHz (15 kHz) adulation FM/DC coupled nut Bias 2.5V DC £1% temperature compensated to +100 mV. Supplied in Tx/Rx. put Impedance >40k ohms distortion maximum system deviation, | kHz tone capability 1.
SECTION 2 INSTALLATION 2.1 PER-INSTALLATION CHECKS Field alignment should not be required before the 3422 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 DM3422 ONLY Connector J201 on the data transceiver PC board provides the interface with the data equipment. This is a [4-pin female connector with 025" square pins on 0.
SECTION 3 PROGRAMMING 3.1 INTRODUCTION DM3422 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 DM3422 SYNTHESIZER DATA PROTOCOL Programming of the dividers and the charge pumps are performed on a 3-line bus; SYNTH ENABLE, SYNTH DATA, AND SYNTH CLK. On initial power up four 24-bit words are required to load the 3422 Data Transceiver.
PROGRAMMING The value of CN should be interpolated for frequencies between the band edges. With these recommended values of CN, the transceiver should have the factional spurs minimized far below the levels needed make 70 dB adjacent channel RX or TX specification. ample: del 3422-530 is a 150-174 MHz transceiver. IMHzTXCN=83 01010011 Binary 2 MHz Binary 4 A-WORD The A-Word must be sent last (see Figure 3-3).
PROGRAMMING MBC bp 0 ou mow owe ADDRESS NOT USED o cK . ALWAYS (CHARGE PUMP CURRENT SETTING) BINARY ACCELERATION {CHANNEL DEPENDENT) FACTOR {ALWAYS PR (SCALPER TYPE} 1 MODULATORS 51 Figure 3-2 B-WORD wist Cora Horn mono 2 on foul ow Poe hw mow own wn 2 mom METEOR OL mee war sen ADDRESS Cows " Hypnoses ox G2 458 TR sable REVERENCE SOE BY 4 CHARGE UNDERCURRENT SETTING.
PROGRAMMING } RECEIVE TO TRANSMIT SEQUENCE Synthesizer is loaded (B and A 24-Bit words or one long 32-bit A-Word). Refer to Figure 3.5. The state of the RX_EN line does not have to be changed until the last bit is sent. However, RX will cease as soon as it is changed. The SYNTH ENABLE line should be held HIGH for 2 to 3 milliseconds after the last word is sent. This puts the frequency synthesizer in a SPEEDUP MODE and slightly improves lock times.
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 and Loader board. A block diagram of the transceiver is located in Figure 4-1. The 3422 is also available in Transmit only and Receive only models. The 3422 is available with a reference oscillator stability of $2.5 PPM. The 14.85 MHz OTC (Temperature Compensated Crystal Oscillator) is soldered directly to the RF board. The OTC is not serviceable. 4.1.
ER CULT DESCRIPTION 5a RTA FLEE si cn mmc TRANSMITTER nn uc en Asian sri wxovr ois ou VCO nom gra gs nex Quagmire oor Figure 4-1 TRANSCEIVER BLOCK DIAGRAM ary 1997 No. 001-3422-001 4.
CIRCUIT DESCRIPTION Lock DATA SERIAL INPUT + PROGRAM CLASSLESS on STROBE Ns RO NMt NMS vee SCALPER i sas . ¢ FRACTIONAL SCALES s MAIN DIVIDERS x f— Mo Dells om PRESCHOOLER ACCUMULATOR Yells Lost 5 FT 8 NORMAL ar CHARGE Vale A EM—s{ PLASH UME DETECTOR o to php sep 3 ocr ‘ X LARGE Rr TERENCE MP Emma rer REFERENCE DIVIDER C Large Ht 3111 POMP 3 SECONDARY — ® REFERENCE SELECT Pita AUXILIARY PHASE o % Tue exile] AUXILIARY DIVIDER dopa SSA Figure 4-2 USU SYNTHESIZER BLOCK DIAGRAM 4.2.
AR CUT DESCRIPTION The -2.0V applied to the VCO is derived from 1e 14.85 MHz OTC frequency that is amplified by 902, rectified by CR902 and filtered by C912, C917, 918 and C920 on the RF board. The VCO frequency is modulated using a similar ethos. The transmit audio/data signal from J201, in 6 is applied across var actor diode CR861 which arise the VCO frequency at an audio rate. Series pastors C855/C856 set the amount of deviation educed along with CR862 and C365.
When J201, pin 4 is high in receive Q173 is turned on and the collector voltage goes low. A low on the base of Q172 turns the transistor on and the regulated +9.6V on the emitter is on the collector for the receive circuitry. Q171 applies a low on the base of Q841, the transistor is off and the collector is high. With a high on the base of Q842 and a low on the emitter, this reverse biases CR851 fora high impedance. . The capacities leg on the VCO board is formed by C852, CR851 and C853.
CIRCUIT DESCRIPTION Additional filtering of the receive signal is prided by a three pole discrete LC var actor tuned band ass filter composed of filter L221-1224, R283-CR285, C214-C217, C221-C223. L211 and 213 provide impedance matching between Q202 and is filter. Resistor R205 is used to lower the Q of 211 to make it Jess frequency selective. The same control voltage that adjusts to two pole filter on fret ency adjusts this filter as well.
the unwanted harmonics from the oscillator output. The output of Q251 is coupled to the auxiliary synthesizer phase detector by C814. The oscillator is phase locked at 21.9 MHz with L251 adjusted to center the control voltage. Second [F Filter The output of the internal double-balanced mixer is the difference between 21.45 MHz and 21.9 MHz which is 450 kHz. This 450 kHz signal is fed out on pin 3 and applied to second IF filters 2241 and 2242.
CIRCUIT DESCRIPTION crease on Q53] increases the power output level of 531. If the power output of U531 increases, the forward peak detector voltage increases and U111C creases the forward bias on Q531. The decrease on 531 decreases the output power of USU. The output of CRS91/CR592 is fed to US81A/B respectively. If the output of either buffer increases, e increase is applied to the inverting input of 11{C. The output of U111C then decreases and 531 decreases the input voltage to U531 to lower the wer.
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 5.3.2 MIXER/DETECTOR (U201) Check the DC voltage at C815 with a channel Data Output sar the center of the band. If the VCO is locked on quench, this should be a steady DC voltage near Using a .01 pF coupling capacitor, inject a V. Fit is not locked on frequency, it should be near 21.45 MHz, 1 mV signal, modulated with [ kHz at e lower or upper end of its range (OV or 13 kHz deviation at U241, pin |. The signal output at U241, pin § should be approximately 150 mV P-P.
5.3.3 SECOND LO (Q401) Verify that the Second LO signal is present at U241, pin 4. The Second LO should be at 21.90 MHz and not less than 500 mV P-P. 5.3.4 AUDIO BUFFER AMP (U241) 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 L253 (see Section 6.7). The gain of U241 is 2.8 for 30 kHz radios and 5.5 for 15 kHz radios. 5.3.5 CRYSTAL FILTERS The 21.45 MHz IF signal is provided to the crystal filters 5.
REJOICING 4.4 FINAL AMPLIFIER (USU) Check the voltages on U531. Pin 2 = 5.5V DC (varies with power setting) DC Pind=127vVDC Power output at C551 should be +39 DBMS. 1.5 ANTENNA SWITCH (CR561/CR562) Check the antenna switch voltages. CR561 =8.6V DC CR562 = 8.0V DC The loss through the Antenna Switch should be 1.9 to2.1dB. .6 MODULATION INPUT (J201, PIN 6) Check for audio/data signals at J201, pin 6, Y301, pin 1 and R821, pin 3. 7 OTC (Y801) Check Y801, pin 1 for 2.5V DC 1%.
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 6-3 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 . Load the synthesizer with a channel frequency in the MIDDLE of the band. . Key the transmitter, The voltage at J201, pin 2 should be 13.3V DC. do not transmit for extended periods.) Adjust R535 clockwise for 5.0W Adjust voltage and power if necessary. Check the power at a channel frequency on the LOW and HIGH ends of the band. The power output should be SW +1W with current less than 2.5A for 380-512 MHz transmitters. 5.1 MODULATION ALIGNMENT Apply a 1V, 100 Hz, +2.
6.6 TRANSMITTER/FREQUENCY WITH LOADER NOTE: If the radio is not intended to use Diagnostics go to Section 6.5. NOTE: Subtract the current drawn by the Test Loader or any Interface Units from all measurements. I. Set the Diagnostic Enable DAC (DACE) to 255, {Ff. 2. Select a Transmit channel frequency in the MIDDLE of the band. Make sure voltage at J201, pin 2 is 13.3VDC. 3. Adjust R535 fully clockwise for maximum power output. 4. Adjust the Power Adjust DAC setting (DAC) to set the power output to SW £0.3W.
ALIGNMENT PROCEDURE 7 RECEIVER CAUTION 0 not key the transmitter with the generator concocted because severe generator damage may result. OTE: If the radio is intended 1o use Diagnostics or is Radio/Loader board combination go to Section 6.8. OTE: All distortion and SIN AD measurements are formed with psychometric audio filtering. Connect the test setup shown in Figure 6.2. Preset tuning slugs of L201, 1.203, 1.212, L221 and 1.224 flush with the top of the can.
20.Measure the 12 dB SIN AD sensitivity. The RF input level should be less than -116 dBm (0.35 pV). 21.Load the synthesizer with a receive channel frequency to the MIDDLE of the band. 22.Set the signal generator to the same frequency with an amplitude of -116 dBm. 23. Adjust R920 for the best SIN AD reading. 24. Adjust the RF input level until 12 dB SIN AD is measured. The RF input level should be less than -116 dBm (0.35 pV). 25.
ALIGNMENT PROCEDURE 9. Turn the slug of L221 clockwise. This 24. Adjust the RF input level until 12 dB SIN AD is helps to center the filter tracking across the band. measured. The RF input level should be less than -116 dBm (0.35 pV). 0.Measure the 12 dB SIN AD sensitivity. The RF input level should be less than -116 dBm (0.35 pV). 25.
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. The Johnson Data Telemetry Corporation designs and manufactures radios and radio modems to serve a wide variety of data communication needs.
TABLE OF CONTENTS Section 1 GENERAL INFORMATION Page Title Number EPISCOPALIAN iii 1.2 INTRODUCTION 1.2.1 GENERAL 1.2.2 FL-3412, FL-3422, OR FL-3492 .. 1.3 ACCESSORIES. 1.5 PRODUCT WARRANTY 1.6 REPLACEMENT PARTS. PROBLEM ARISES. 1.7.1 Factory Repair FL-3286 SPECIFICATIONS . .. 2.1 GENERAL 2.2.2 EQUIPMENT REQUIRED. . , .. 223 ADJUSTMENTS 2.2.4 8 POSITION DIP SWITCH $100. . 2.2.5 TRANSMIT DEVIATION LEVEL ADJUSTMENT... . 2.2.6 RECEIVE LEVEL ADJUSTMENT 2.2.72.5 VDC LEVEL ADJUSTMENT BA GENERAL ooh 3.1.
TABLE OF CONTENTS 3.2.1 FILE 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 3.2.8 FEY FUNCTIONS 32.9 TEST FILE 3.2.10 ENGINEER 3.2.11 WINDOW 4.1 INTRODUCTION 4.2 RTU INTERFACE 42.1 INTERFACE DESCRIPTION ins . 422 FLOW CONTROL PROTOCOL La 42.3 RESTRICTS HANDSHAKING PROTOCOL DIAGNOSTICS 4.3.2 HARDWARE DIAGNOSTICS 4.3.3 NETWORK DIAGNOSTICS 4.3.
TABLE OF CONTENTS List of Figures Figure/Title Page Number 2-1 3286 Programming Software Screen cen cave 20] 2-2 demode Board... .. ..24 3-1 Main Window 3-1 3-2 Edit Radio Types Window. 33 3-3 Edit Frequencies Window ..3-5 3-4 Advanced Radio Frequencies Window. .. v.36 3-5 Communication Settings Window. Edit Radio Specifications Window Production Test Window ..39 3-8 Setup Production Frequencies Window. .
TABLE OF CONTENTS List of Tables Table/Title Page Number Radio Type/Frequency Range . 3-2 Tx Modes 3-3 F Key Functions... DATA TELEMETRY Johnson 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. JD T's 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. Xn; J hi SON 1-6 Compares 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 on the 3400-series telemetry radios which may be used with this modem, refer to the specific transceiver service manual, 2.2 SET UP 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 $100 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 OFF QFF OFF 2 OFF OFF ON 3 OFF ON OFF 4 OFF OFF OFF 6 ON OFF OFF Table 2-2 Setup Mode 8 Setup Mode ON Operating Mode DEE 2.2.
SETUP AND ALIGNMENT File Edit Utilities Pig gram Code Production Test Engineer Window Help MN Production Test Radio: Diagnostics: Voltage: ov Freq Pair: Cu rent: 0.004 Range: ASS Voltage: 0.60vV Forward Power: .00v Ra Frequency: Reverse Power: 0.00V SWERVE: 0.0:1 Tx Frequency: | Remote Can trot [] | Temperature: coco Symbol Sync: 0.
SETUP AND ALIGNMENT ON S100 Cas Naugahyde o 10 OFF 123 8 Se R crane Select Test Mode ™200 O [s¥) 2.5 VDC Adjust S TR400 « RX level adjust ° N, ~~ TPE020 [] «toe 1] R410 R632 Jit R808 o Rem TX Deviation adjust O Figure 2-2 3286 Modem Board 24 chanson 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 5H Framer Ed Little Program Code Production Tet Engineer Window Help Figure 31 Main Window 3.2 3286 WINDOWS This window provides access to pull-down menu options. 3.2.
PROGRAMMING ® Radio Type Toggles through the available radio types (3412, 3422, 3492) 1286 Programmer TE Ede EdR Utilities Program Code Production East Engineer Window Help 2 Setup Radio Parameters i Transceiver Parameters Enable Pc LED (Gm): [3 Enable CO LED (Yel) Enable Tx LED Red 7 TX-Ondp Radio: o Sodom Parameters.
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/modern. 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 7.5 kHz frequency into the transceiver.
PROGRAMMING 3.2.3 EDIT FREQUENCIES WINDOW fr Figure 3-3 Edit Frequencies Window ® Receive and Transmit Frequencies There are 2 maximum of § pairs of channels (8 Rx and 8 Tx) that can be programmed into the modem. Chance] 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 2sJohiisor 2286 Programmer File Edit Cuties Program Code Production Test Engineer Window Help EL Frequency vanned] Chan: Power. Tx Mod: Octopus || @Factory || € Factory : .
PROGRAMMING 3.2.4 UTILITIES ¢ 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. a.
PROGRAMMING m Setup Default Bahia Frequencies and TNs oK: Exit and Save Cancel: Exit and Don't Save Chan Pair: Rx Frequency: Tx Frequency: Low: | | [96 36 Mid: 391.5008800 | ] [98 38 High: 463. | 100 98 [Besot oaks] [THK] [once | Figure 3-6 Edit Radio Specifications Window o 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 1102 and cycle power (see Section 2, Figure 2-2).
PROGRAMMING 3286 Programmer Ede Edt Stiles mM Production Test Radio: Freq Pair: Range: Program Code Production Test Engineer Window Help RSI Voltage: Forward Power: I Rx Frequency: 468.008080 Reverse Power: SWERVE: Tx Frequency: 460.000880 | Remote Control: [J | Temperature: Enable Pwr LED: Enable CD LED: Enable Tx LED: TX-Only: Hall Speed: Protocol: FZ: Auto Front-End Adi nit Tune Settings F4: Start Heat Run Transmitter On F8: Send Start Test Symbioses Sync: Tx ode: © Power Adi Qed Adi Di .
PROGRAMMING eo Demode Table 3-2 Tx Modes Tx Mode Description symbol Sync [Sarnie 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 ware Wave [Carrier is modulated with a 100 Hz square lo Modulation Carrier tone with no modulation e Dias. En Enables diagnostics ® Protocol Selects the protocol between the PC and modem.
Program RR, re I Radio; Heat Bun Times fin 5) Te [5] 8pg Rx [5° age Defunct pac Adj Valuer Chan gy Frequency Tx Frequency Bx CN Ten Pwr Mod Front-Eng [f Low: 59. 999004 | [359 salaam [5] los [Fi] J ic: 459. gaga 468. 800085 | fon ag 127 | High: |475. Spay 878. 900887 | [195] [55 [195] | ———1 478. 850a7 | 3-1 No.
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 Pur, and TH 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 8 data bits, 1 start bit, | stop bit and no parity. The baud rate is programmable (19200 / 9600 7 4800 baud) with the 3286 Setup Software (a Windows® based program.
PROTOCOL omens OO 00 0-00 mm 7 — RTS ts Modem) Figure 4-1 RTU Data Controlled by CTS Signal RTS (12 Moderns // 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 JDT 3282 and 3276 Modems.
PROTOCOL 4.3 DIAGNOSTICS 43.1 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 2 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.
SECTION 5 CIRCUIT DESCRIPTION 5.1 GENERAL 5.1.1 INTRODUCTION The modem board (Part number 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. REG and analog modem circuitry, while U602 provides SV 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.