HIGH SPECIFICATION DATA TRANSCEIVER PART NO. 242-3474-XX0 Second Printing August 1998 Part No. 001-3474-002 8-98 Printed in U.S.A.
HIGH SPECIFICATION DATA TRANSCEIVER PART NO. 242-3474-XX0 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 1 GENERAL INFORMATION 1.1 1.2 SCOPE OF MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 EQUIPMENT DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TABLE OF CONTENTS 4.3 4.4 RECEIVER CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 HELICAL FILTER (Z201), RF AMPLIFIER (Q201) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 MIXER (U221), FIRST LO AMPLIFIER (Q301) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TABLE OF CONTENTS 8 SCHEMATICS AND COMPONENT LAYOUTS VCO COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TRANSCEIVER COMPONENT LAYOUT-COMPONENT SIDE VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TRANSCEIVER COMPONENT LAYOUT-OPPOSITE SIDE VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TRANSCEIVER SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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SECTION 1 GENERAL INFORMATION 1.1 SCOPE OF MANUAL This service manual contains alignment and service information for the Johnson Data Telemetry (JDT) DM3474 UHF High Specification Data Module Transceiver. 1.2 EQUIPMENT DESCRIPTION 1.2.1 GENERAL The JDT DM3474 is a synthesized data transceiver (transmitter and receiver) which operates in the 403-512 MHz UHF frequency range. Transmitter power output is 2 watts nominal, and operation is simplex or half duplex.
GENERAL INFORMATION 1.4 PART NUMBER BREAKDOWN The following is a breakdown of the part number used to identify this transceiver: 242-3474 - X Y Z 0 = Base 2 = Portable 1 = 12.5 kHz BW 2 = 20 kHz BW 3 = 25 kHz BW 8 = 12.5 kHz BW * 9 = 25 kHz BW * 1 = 380-403 MHz 2 = 403-419 MHz 3 = 419-435 MHz 4 = 435-451 MHz 5 = 450-466 MHz, 450-470 MHz 6 = 464-480 MHz 7 = 480-496 MHz 8 = 496-512 MHz * This number applies to 450-470 MHz transceivers. 1.
GENERAL INFORMATION When your call is answered at JDT, you will hear a brief message that contains the options: “1” for Sales, “2” for Order Entry, “3” for Customer Service, “4” for Marketing, “7” for other issues, or “9” to repeat the message. When you enter a first number of “3”, you may enter “1” for Technical Assistance, “2” for Product Repair or “3” for Warranty. This number may be entered during or after the message using a tone-type telephone.
GENERAL INFORMATION 1.9 IF A PROBLEM ARISES... JDT products are designed for long life and failure-free operation. If a problem arises, factory service is available. Contact the Customer Service Department before returning equipment. A service representative may suggest a solution eliminating the need to return equipment. 1.9.1 FACTORY REPAIR Component level repair is not recommended on the DM3474 Transceiver.
GENERAL INFORMATION 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.
GENERAL INFORMATION Duty Cycle Transmitter Attack Time Spurious and Harmonic FM FM Hum and Noise Audio Response Data Input Impedance Modulation Response Current Drain 50%, 60 seconds maximum transmit < 7 ms (dependent on synthesizer implementation) -37 dBm -40 dB 12.5 kHz, -45 dB 25 kHz ±1.5 dB from DC to 5 kHz (reference to 1 kHz) Programmable to ±1 dB at the RF band edges via J201, pin 14. 100k ohm ±1 dB from DC to 5 kHz (reference to 1 kHz) < 800 mA at 2W, +7.5V DC 1-6 Part No.
SECTION 2 INSTALLATION 2.1 PRE-INSTALLATION CHECKS Field alignment should not be required before the 3474 is installed. However, it is a 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 DM3474 ONLY Connector J201 on the data transceiver PC board provides the interface with the data equipment. This is a 14pin female connector with .025" square pins on 0.
INSTALLATION Pin 11 (Carrier Detect) - This output is not used at this time. Pin 12 (RSSI Output) - The RSSI (Receive Signal Strength Indicator) output provides a voltage that increases in proportion to the strength of the RF input signal. Pin 13 (Rx Output) - The data output level is 600-1200 millivolts P-P (200-400 mV RMS) with a modulation signal of 1 kHz at 60% of maximum deviation. The output is DC coupled and referenced to +2.5V DC. Load impedance should be 10k-100k ohms. 2-2 Part No.
SECTION 3 PROGRAMMING 3.1 INTRODUCTION 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 DM3474 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 three 34-bit words are required to load the 3474 Data Transceiver.
PROGRAMMING 3.2.2 B-WORD The B-Word is 24-bits long (see Figure 3-2). It contains the Address, Charge Pump setting factor (CN), Binary Acceleration factors (CK, CL), and Prescaler Type (PR). The Charge Pump Current setting (CN) could be changed on a channel-by-channel basis for ultimate rejection of the Fraction N spurious responses close into the carrier frequency. The 3474 synthesizer has an adjust (R855) for the fractional compensation current.
PROGRAMMING NM1 and NM2 are calculated as follows: N = (NM1 + 2) x 64 + NM2 x 65 Where: N = total division ratio NM1 = Number of main divider cycles when prescaler modulus equals 64 NM2 = Number of main divider cycles when prescaler modulus equals 65 Example: Calculate NM1 and NM2 to Receive 454.500 MHz. LO = 454.5 + 52.95 = 507.45 MHz (52.95 MHz IF with High Side Injection) N = RX LO ÷ FCM = 507.45 ÷ 0.05 = 10149 (FMC = Loop Reference Frequency) NM2 = 64 x FRAC [N ÷ 64] = 64 x FRAC [10149 ÷ 64] = 64 x 0.
PROGRAMMING Figure 3-2 B-WORD Figure 3-3 A-WORD 3-4 Part No.
PROGRAMMING Figure 3-4 SERIAL INPUT WORD FORMAT 3-5 Part No.
PROGRAMMING 3.3 RECEIVE TO TRANSMIT SEQUENCE Refer to Figure 3-5. 1. Synthesizer is loaded (B and A 24-Bit words or one long 32-bit A-Word). 2. The state of the 5RCL line does not have to be changed until the last bit is sent. However, RX will cease as soon as it is changed. 3. 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. 4.
PROGRAMMING 3.4 TRANSMIT TO RECEIVE SEQUENCE Refer to Figure 3-6. 1. 7.5 TX is turned OFF. For best TX adjacent channel power performance this could be shaped. 2. The synthesizer load process could begin slightly before, but when the last bit is strobed in the synthesizer it will become unlocked. For ETSI specs, the TX should be turned OFF “on-frequency”. 3. The 5RCL line should switch from low to high AFTER the 7.5 TX is switched. The 5RCL not only turns the RX circuits on but also Pin Shifts the VCO. 4.
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SECTION 4 CIRCUIT DESCRIPTION 4.1 GENERAL 4.1.1 INTRODUCTION The main subassemblies of this transceiver are the RF board, VCO board, and TCXO. A block diagram of the transceiver is located in Figure 4-1. The VCO board is enclosed by a metal shield and soldered directly to the RF board. The VCO is not serviceable. The 3474 is available with a reference oscillator stability of ±1.5 PPM. The TCXO (Temperature Compensated Crystal Oscillator) is soldered directly to the RF board. 4.1.
CIRCUIT DESCRIPTION 4.1.4 TRANSMITTER The transmitter produces a nominal RF power output of 2W adjustable to 500 mW (-XX0). Frequency modulation of the transmit signal occurs in the synthesizer. Transmit audio processing circuitry is contained in the customer-supplied equipment. 4.2 SYNTHESIZER 4.2.1 INTRODUCTION A block diagram of the synthesizer is shown in Figure 4-1 and a block diagram of Synthesizer IC U801 is shown in Figure 4-2.
CIRCUIT DESCRIPTION RF BPF RF AMP RF BPF Z201 Q201 Z202 MIXER U221 BUFFER 52.
CIRCUIT DESCRIPTION CLOCK DATA SERIAL INPUT + PROGRAM LATCHES VDD STROBE PR Vss EM RF IN 2 2 64/65/72 PRESCALER RF IN NM1 NM2 NM3 FB FB 12 FMOD 8 NF 3 PRESCALER MODULUS CONTROL FRACTIONAL ACCUMULATOR MAIN DIVIDERS RF RN CN TEST 8 EM NORMAL OUTPUT CHARGE PUMP MAIN PHASE DETECTOR 2 NR EM+EA PHP CL 2 SM SPEED-UP OUTPUT CHARGE PUMP MAIN REFERENCE SELECT 12 CK 4 REF IN REFERENCE DIVIDER +2 +2 INTEGRAL OUTPUT CHARGE PUMP +2 PHI SA 2 RA SECONDARY REFERENCE SELECT 2 PA
CIRCUIT DESCRIPTION 4.2.2 VOLTAGE-CONTROLLED OSCILLATOR Oscillator (Q850) The VCO is formed by Q850, several capacitors and varactor diodes, and a ceramic resonator. It oscillates at the transmit frequency in transmit mode and first injection frequency in the receive mode (approximately 450 MHz in transmit and 500 MHz in receive). Biasing of Q850 is provided by R862, R867 and R868.
CIRCUIT DESCRIPTION 4.2.3 VCO AND REFERENCE OSCILLATOR MODULATION Both the VCO and reference oscillator (TCXO) are modulated in order to achieve the required frequency response. If only the VCO was modulated, the phase detector in U801 would sense the frequency change and increase or decrease the VCO control voltage to counteract the change (especially at the lower audio frequencies).
CIRCUIT DESCRIPTION When J201, pin 4 is high in receive, Q834 is turned off, Q101 is turned on and the collector voltage goes low. A low on the base of Q102 turns the transistor on and the regulated +5.5V on the emitter is on the collector for the receive circuitry. With a low on the base of Q831 the transistor is off and the collector is high. With a high on the collector of Q831 and a low on the emitter of Q834, this reverse biases CR850 for a high impedance.
CIRCUIT DESCRIPTION 4.3 RECEIVER CIRCUIT DESCRIPTION 4.3.1 HELICAL FILTER (Z201), RF AMPLIFIER (Q201) Capacitor C201 couples the receive signal from the antenna switch to helical filter Z201. (The antenna switch is described in Section 4.4.5.) Z201 is a bandpass filter tuned to pass only a narrow band of frequencies to the receiver. This attenuates the image and other unwanted frequencies. The helicals are factory set and should not be tuned.
CIRCUIT DESCRIPTION 4.3.4 SECOND LO AMP/TRIPLER (Q401), SECOND IF FILTER (Q901) The input frequency to Q401 is 17.5 MHz from TCXO Y801 coupled through C402. Bias for Q401 is provided by R401, R402, R403 and R404. C403, C404 decouple RF from the amplifier. L401, L402, C405, C406 and C407 pass the third harmonic of the input (52.5 MHz) to U241, pin 1. The output of the amplifier is coupled to U241, pin 1 by C241, and C410 and L404 provided low frequency decoupling. 4.3.
CIRCUIT DESCRIPTION Second IF Filter The output of the internal double-balanced mixer is the difference between 52.95 MHz and 52.5 MHz which is 450 kHz. This 450 kHz signal is fed out on pin 3 and applied to second IF filters Z241 and Z242. These filters have passbands of 9 kHz (12.5 kHz BW), 15 kHz (20 kHz BW) or 20 kHz (25 kHz BW) at the -6 dB points and are used to attenuate wideband noise. Limiter-Amplifier The output of Z241/Z242 is applied to a limiter-amplifier circuit in U241.
CIRCUIT DESCRIPTION 4.4.2 PRE-DRIVER (Q501), DRIVER (Q521) Pre-driver Q501 is biased class A by R501 and R502 and R506. L501 and C502 match Q501 to Q851. C520 and C508 bypass RF from the DC line, and R503 provides supply voltage isolation. R507 ties the +7.5V supply to the circuit for high power applications and R508 ties the circuit to +5V for low power applications. Impedance matching between Q501 and Q521 is provided by L502, L503 and C511. R504 and C504 provide negative feedback to prevent oscillation.
CIRCUIT DESCRIPTION C567, L566, and C570 form a discrete quarter- wave line. When CR561 is forward biased, this quarter-wave line is effectively AC grounded on one end by C570. When a quarter-wave line is grounded on one end, the other end presents a high impedance to the quarter-wave frequency. This blocks the transmit signal from the receiver. C569 matches the antenna to 50 ohms in transmit and receive. In the receive mode, no power is applied to L565, so all the diodes are “off”.
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 NOTE: The user-supplied circuitry must disable the transmitter and receiver when an out-of-lock condition is indicated. When the VCO is unlocked, the fR and fV inputs to the phase detector are usually not in phase (see Section 4.1.2). The phase detector in U801 then causes the VCO control voltage to go to the high or low end of its operating range. This in turn causes the VCO to oscillate at the high or low end of its frequency range.
SERVICING 5.3 RECEIVER SERVICING To isolate a receiver problem to a specific section, refer to the troubleshooting flowchart in Figure 5-1. Tests referenced in the flowchart are described in the following information. NOTE: Supply voltages are provided by the user. 5.3.1 SUPPLY VOLTAGES AND CURRENT Measure the supply voltages on the following pins at interface connector J201: Pin 4 - 5.0V DC Receive Pin 5 - 5.
SERVICING Figure 5-1 RECEIVER SERVICING FLOWCHART 5.3.3 RF AMPLIFIER (Q201) AND FIRST MIXER (Q221) Refer to the schematic diagram for signal levels and test points for measuring levels. 5.3.4 RF AND IF AMPLIFIERS, FIRST MIXER Check the DC voltages shown on the schematic diagram. If they are normal, inject a signal at the input and output of each stage using a .01 µF coupling capacitor.
SERVICING Pin 2 - 7.5V DC Pin 3 - 7.5V DC Pin 4 - 0.0V DC (while transmitting) Pin 5 - 5.0V DC Pin 6 - 2.5V DC Transmit In/1.5V P-P max Place a DC ammeter in the supply line to the transceiver and the following maximum currents should be measured: Pin 2 - 650 mA Pin 3 - 250 mA Pin 5 - 12 mA Figure 5-2 TRANSMITTER SERVICING FLOWCHART 5-5 Part No.
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SECTION 6 ALIGNMENT PROCEDURE AND PERFORMANCE TESTS 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 Section 2.2, Interfacing with Data Equipment. 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 AND PERFORMANCE TESTS 6. Adjust R542 clockwise for 2.30V DC (+0/-0.1V DC). 7. Readjust C553 counterclockwise for minimum current. 8. Tune C527 clockwise for maximum power. 9. Tune C553 clockwise for 2.0W (±0.1W). Current should be less than 900 mA. (Power output should be 1.6-2.4W and current less than 900 mA from 403-512 MHz.) 10. Monitor the frequency with a frequency counter and adjust TCXO (Y801) for the channel frequency ±100 Hz. Figure 6-1 TRANSMITTER TEST SETUP 6.2.
ALIGNMENT PROCEDURE AND PERFORMANCE TESTS 6. Tune C553 clockwise for minimum power. 7. Adjust R542 for the required power level. 8. Tune C527 for power balance at frequencies which are as close as possible to ±5 MHz from the center of the channel frequency. 9. Re-adjust R542 for the power level required if necessary. 10. Monitor the frequency with a frequency counter and adjust TCXO (Y801) for the channel frequency ±100 Hz. 6.2.4 MODULATION FLATNESS ALIGNMENT 1.
ALIGNMENT PROCEDURE AND PERFORMANCE TESTS Figure 6-2 RECEIVER TEST SETUP 6.2.5 RECEIVER ALIGNMENT C A U T I O N: Do not key the transmitter with the generator connected! Severe generator damage may result. 1. Connect the test setup shown in Figure 6-2. Adjust the power supply for +7.5V DC. 2. Measure the receive current drain. (Typically current should be <80 mA.) 3. Preset tuning slugs of L222/L224 to the full clockwise position (slug in all the way). 4.
ALIGNMENT PROCEDURE AND PERFORMANCE TESTS NOTE: Maintain these deviation levels throughout the test when measuring AC levels, SINAD and % distortion. 3. Adjust L242 for 2.5V DC (±0.05V DC) at the receive audio output. 4. Set the RF signal generator level to -105 dBm, “unmodulated”. 5. Set the generator frequency 3 kHz below channel center (-X10) or 5 kHz below channel center (-X20/-X30). 6. Adjust C232, then L222 for peak RSSI voltage. NOTE: Use 2V scale on DVM. 7.
ALIGNMENT PROCEDURE AND PERFORMANCE TESTS R509 Figure 6-3 ALIGNMENT POINTS DIAGRAM 6-6 Part No.
SECTION 7 PARTS LIST .
PARTS LIST SYMBOL NUMBER C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C 229 230 232 235 241 242 243 245 246 247 248 261 262 263 265 301 302 303 304 306 309 310 401 402 403 404 405 406 407 410 501 502 503 504 505 506 507 508 509 510 511 520 521 522 523 524 525 526 527 528 DESCRIPTION PART NUMBER .01MF X7R K 0603 CHPR .01MF X7R K 0603 CHPR 1.5-5PF SMD CERAMIC .01MF X7R K 0603 CHPR .01MF X7R K 0603 CHPR .1UFD X7R J 1206 RL .1UFD X7R J 1206 RL .
PARTS LIST SYMBOL NUMBER C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C 541 542 546 547 548 549 550 551 552 553 554 555 560 561 562 563 564 565 567 568 569 570 571 572 573 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 817 818 819 831 832 833 834 835 836 837 DESCRIPTION PART NUMBER 68pF 5% NPO 0603 470pF 5% NPO 0603 68pF 5% NPO 0603 68pF 5% NPO 0603 1.0UFD 16V SMD TANT RL .
PARTS LIST SYMBOL NUMBER DESCRIPTION PART NUMBER C 838 C 839 C 840 C 841 C 842 C 844 C 845 C 846 C 847 C 848 C 849 C 850 C 851 C 852 C 855 CR 201 CR 561 CR 562 CR 831 CR 832 EP 200 EP 501 EP 541 J 201 J 501 L 201 L 202 L 222 L 223 L 224 L 242 L 301 L 302 L 401 L 402 L 404 L 501 L 502 L 503 L 521 L 522 L 541 L 561 L 562 L 563 L 564 L 565 L 566 L 801 L 851 68pF 5% NPO 0603 .01MF X7R K 0603 CHPR .01MF X7R K 0603 CHPR 68pF 5% NPO 0603 .01MF X7R K 0603 CHPR 1.0UFD 16V SMD TANT RL .
PARTS LIST SYMBOL NUMBER DESCRIPTION PART NUMBER MP 801 MP 802 MP 803 MP 804 MP 806 PC 001 Q 101 Q 102 Q 103 Q 131 Q 201 Q 221 Q 222 Q 301 Q 401 Q 501 Q 521 Q 541 Q 831 Q 832 Q 833 Q 834 Q 851 R 120 R 131 R 201 R 202 R 203 R 204 R 222 R 223 R 224 R 225 R 226 R 228 R 229 R 230 R 241 R 242 R 243 R 261 R 262 R 263 R 264 R 265 R 267 R 268 R 269 R 270 R 271 CAN-VCO 3474 TOP SHIELD 3474 XMIT SHIELD 3474 BOTTOM XMIT 3474 SHIELD BOTTOM SYNTH XTAL FLTR SHIELD 3472 PCB DL 3474 MAIN (MUL6) NPN TRANS SOT 23 80V DIG
PARTS LIST SYMBOL NUMBER R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R 301 302 303 304 401 402 403 404 501 502 503 504 506 508 509 521 522 524 541 542 543 546 550 551 562 564 801 802 804 805 806 807 808 810 811 812 813 814 817 831 834 835 836 838 839 840 841 842 844 845 DESCRIPTION PART NUMBER 3.3K OHM J 063W 0603 CHIP 1.8K OHMS J 063W 0603 CHI 180 OHMS J 063W 0603 CHIP 470 OHMS J 063W 0603 CHIP 10 OHMS J 063W 0603 CHIP 15k OHMS J 063W 0603 CHIP 4.
PARTS LIST SYMBOL NUMBER DESCRIPTION PART NUMBER R 846 R 847 R 848 R 851 R 852 R 853 R 854 R 855 R 856 R 857 R 858 R 860 RE 000 RE 000 RE 000 RM 000 U 101 U 131 U 221 U 241 U 261 U 801 Y 801 Z 201 Z 202 Z 221 Z 241 Z 242 18 OHMS J 063W 0603 CHIP 18 OHMS J 063W 0603 CHIP 1.5K OHM J 063W 0603 CHIP 150 OHMS J 063W 0603 CHIP 39 OHM J 0603 CHIP/R 150 OHMS J 063W 0603 CHIP 82 OHMS 5% 063W 0603 SMD 100K SMD TRIMMER 4.7K OHM J 063W 0603 CHIP 4.7K OHM J 063W 0603 CHIP 4.
PARTS LIST SYMBOL NUMBER DESCRIPTION PART NUMBER C 873 C 874 C 876 C 877 C 878 CR 850 CR 851 CR 852 CR 853 CR 854 CR 855 CR 856 L 851 L 852 L 853 L 854 L 855 L 856 Q 850 Q 851 Q 852 Q 853 R 851 R 852 R 853 R 854 R 856 R 857 R 858 R 862 R 863 R 864 R 865 R 866 R 867 R 868 R 869 R 870 R 871 R 872 R 874 R 875 RM 000 Z 850 100pF 5% NPO 0603 3.3pF +/-.1pF NPO 0603 8.2pF +/-.1pF NPO 0603 1pF +/-.
PARTS LIST EP 200 J 201 J 501 L 222 L 224 MP 801 MP 802 MP 803 MP 804 MP 806 R 230 R 261 RE 000 RE 000 Y 801 Z 221 Z 241 Z 242 MINI CER CRY PIN INSUL 14P SGL ROW RCPT.1CNTR STR TERM PCB 1+/-6%UH VAR. IND. 5MM 1+/-6%UH VAR. IND. 5MM CAN-VCO 3474 TOP SHIELD 3474 XMIT SHIELD 3474 BOTTOM XMIT 3474 SHIELD BOTTOM SYNTH XTAL FLTR SHIELD 3472 2.7K OHM J 063W 0603 CHIP 200k OHMS J 063W 0603 CHI SCHEMATIC DL 3474 MAIN ASSEMBLY DL 3474 MAIN BD 17.5 MHZ TCXO +/-1.5 PPM 52.
PARTS LIST C 227 EP 200 J 201 J 501 L 222 L 224 MP 801 MP 802 MP 803 MP 804 MP 806 R 230 R 261 RE 000 RE 000 Y 801 Z 221 Z 241 Z 242 10pF +/-.1pF NPO 0603 MINI CER CRY PIN INSUL 14P SGL ROW RCPT.1CNTR STR TERM PCB 1+/-6%UH VAR. IND. 5MM 1+/-6%UH VAR. IND. 5MM CAN-VCO 3474 TOP SHIELD 3474 XMIT SHIELD 3474 BOTTOM XMIT 3474 SHIELD BOTTOM SYNTH XTAL FLTR SHIELD 3472 1.8K OHMS J 063W 0603 CHI 100k OHMS J 063W 0603 CHI SCHEMATIC DL 3474 MAIN ASSEMBLY DL 3474 MAIN BD 17.5 MHZ TCXO +/-1.5 PPM 52.
SECTION 8 SCHEMATIC AND COMPONENT LAYOUTS TRANSISTOR AND DIODE BASING REFERENCE TABLE TRANSISTORS Part Number Basing Diagram Identification 676-0003-604 676-0003-616 676-0003-621 676-0003-634 676-0003-636 676-0003-640 676-0003-651 676-0006-450 676-0013-701 DIODES 2 1 1 1 1 3 1 4 1 3604 26 74 3B R25 24 1R 623-1504-001 623-1504-002 623-1504-023 623-5005-020 623-5005-022 - 4D 5A A7 S S INTEGRATED CIRCUITS 8-1 Part No.
SCHEMATICS AND COMPONENT LAYOUTS Figure 8-1 VCO COMPONENT LAYOUT (COMPONENT SIDE VIEW) 8-2 Part No.
SCHEMATICS AND COMPONENT LAYOUTS Figure 8-2 TRANSCEIVER COMPONENT LAYOUT (COMPONENT SIDE VIEW) 8-3 Part No.
SCHEMATICS AND COMPONENT LAYOUTS Figure 8-3 TRANSCEIVER COMPONENT LAYOUT (OPPOSITE COMPONENT SIDE VIEW) 8-4 Part No.
SCHEMATICS AND COMPONENT LAYOUTS Figure 8-4 DM-3474 SCHEMATIC Company Confidential Copyright 1998 Johnson Data Telemetry Corporation 8-5 Part No.
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