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Maxon SD-125 Series Service Manual

Rf link module
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  • Page 2: Table Of Contents

    MAXON SD-125 RF LINK MODULE TABLE OF CONTENTS…………………………………………………………………………………….…………. SPECIFICATIONS……………………………………………………………………………………………...……… UNPACKING……………………………………………………………………………………………………………. INTRODUCTION………………………………………………………………………………………………………… FEATURES ……………………………………………………………………………………………………………… THEORY OF OPERATION ……………………………………………………………………………………………. INTRODUCTION ………………………………………………………………………………………………………………… DIGITAL CIRCUITS ……………………………………………………………………………………………….. RF CIRCUITS ……………………………………………………………………………………………………… RF CIRCUITS PLL SYNTHESIZER …………………………………………………………………………….. RECEIVER …………………………………………………………………………………………………………. MAINTENANCE AND REPAIR ………………………………………………………………………………………. GENERAL …………………………………………………………………………………………………………. REMOVING & REPLACING THE UPPER COVER …………………………………………………………..
  • Page 3 MAXON SD-126 RF LINK MODULE VCO (400-430 MHZ) ……………………………………………………………………………… VCO (440-470MHz) ………………………………………………………………………………. FRONT-END (148-174MHz) …………………………………………………………………….. FRONT-END (400-430 MHz) ……………………………………………………………………. FRONT-END (440-470MHz.) ……………………………………………………………………. POWER AMPLIFIER (148-174MHz) ……………………………………………………………. POWER AMPLIFIER (400-430MHz) ……………………………………………………………. POWER AMPLIFIER (440-470MHz) ……………………………………………………………. DIGITAL PCB ASSEMBLY……………………………………………………………………….. RF PCB ASSEMBLY (148-174MHz) …………………………………………………………….

  • Page 4: Specifications

    MAXON SD-125 RF LINK MODULE SPECIFICATIONS GENERAL Equipment Type................Data Radio Performance Specifications …………………………………………TIA / EIA-603 & ETS 300-113 Band………………………………………………………………………UHF / VHF Channel Spacings………………………………………………………25 Khz, programmable RF Output Power ……………………………………………………….5/1 watt Modulation Type……………………………………………………….. F3D, F3E Intermediate Frequency ……………………………………………….451 MHz & 455 MHz Numbers of Channels…………………………………………………..16...
  • Page 5 MAXON Sd-125 RF LINK MODULE Frequency Bands: VHF:V1 136.000 – 162.000 MHz 136.000 – 162.000 MHz 148.000 – 174.000 MHz 148.000 – 174.000 MHz UHF:U2 440.000 – 470.000 MHz 440.000 – 470.000 MHz 400.000 – 430.000 MHz 400.000 – 430.000 MHz 420.000 –...
  • Page 6 MAXON SD-125 RF LINK MODULE Modulation Sensitivity ………………….. 100mmV RMS @ 60% Peak Dev. Hum & Noise: 25 Khz Channel Spacing……………….. > 40 dB(with no PSOPH) Modulation Symmetry…………………… < 10% Peak Dev @ 1kHz input for nominal dev + 20db Load Stabilitty ……………………………….
  • Page 7 MAXON Sd-125 RF LINK MODULE AF Distortion…………………………………………... < 5% @ Nom., < 10% @ Extreme Condition 25,0 kHz CP…………………………………………. < 40 dB No PSOPH Receiver Opening Range………………………….. < 16 mS Squelch Opening Range:…………………………… RF level for 6 to 14 dB Sinad Squelch Closing Range (Hysteresis)………………...

  • Page 8: Unpacking

    MAXON SD-125 RF LINK MODULE ENVIRONMENTAL (performance without degradation unless stated) Temperature……………………………………………….. Deg C Operating …………………………………………………. - 30 to + 60 C Degradation Specified @ Extreme Storage ……………………………………………………. - 40 to + 80 C Recharging…………………………………………………. - 10 to + 55 C ESD………………………………………………………….

  • Page 9: Introduction

    MAXON SD-125 RF LINK MODULE FEATURES INTRODUCTION Busy Channel Lockout The Maxon SD 125 Series of RF Link Modules From • Maxon utilizes the latest technology in its design and 16 Channels manufacturing. Both he UHF and VHF models (Phase •...

  • Page 10: Theory Of Operation

    MAXON SD-125 RF LINK MODULE CHANNEL SELECTOR One of 16 channels may be selected using the Dip Switch INTRODUCTION (SW401). SW401 encodes the channel number, selected into 4-bit binary code. The binary code plus one equals the The VHF and UHF radios are comprised of two PCB's (an channel number.

  • Page 11: Rf Circuits Pll Synthesizer

    MAXON SD-125 RF LINK MODULE LEVEL SHIFTER & CHARGE PUMP ANTENNA SWITCH The charge pump is used for changing output signals Fr, When transmitting, the diodes D5 and D6 are forward biased Fv at PLL IC from 0-5v to 0-12v necessary for controlling enabling the RF signal passage to the antenna.
  • Page 12 MAXON SD-125 RF LINK MODULE FIRST MIXER D9, T2 and T3 are double balanced mixers which provide the 45.1 MHz intermediate frequency output. The filtered frequency from the front end module is coupled to T2 . The 45.1 MHz IF output is matched to the input of the 2-pole monolithic filter by L14, L31, C69 and C97.

  • Page 13: Maintenance And Repair

    MAXON SD-125 RF LINK MODULE GENERAL When removing or fitting, use the Exploded View and Parts List, located on page 55 in conjunction with the following procedures: WARNING: Disconnect the SD-125 from all • external equipment at the D-Sub connector prior to disassembly.

  • Page 14: Removing 7 Replacing The Rf Board

    MAXON SD-125 RF LINK MODULE REMOVING & REPLACING BOARD Removing the RF Board Assembly: Remove the Upper Cover (refer to Removing & Replacing the Upper Cover). Remove the Digital Board Assembly and Shield Plate (refer to Removing & Replacing the Digital Board Assembly &...

  • Page 15: Programming

    MAXON SD-125 RF LINK MODULE The SD-125 UHF/VHF Receiver is by design, broad The SD-125 Series radio requires the ACC-900 band covering UHF(400-430 MHz & 440-470 MHz) Programming Software, ACC-2000 Interface Module, and VHF(148-174 MHz) and should require no 9-15 VDC 200mA Power Supply and QPA-4000 special alignment, unless repairs are performed on Programmer Interface Cable.
  • Page 16 With the setting is -116dBm, that is equivalent to 0.35mV) new SD-125 series, the squelch level to open or close (unmute or mute) is set up by software control. 8. Press and release "READ" button, LED indicator will flash 1 time then it will be OFF.
  • Page 17 MAXON SD-125 RF LINK MODULE for open and close squelch (mute LED will be OFF & unmute LED will be ON). NOTE: The difference of RF signal strength  between the unmute and mute levels must be greater than or at least equal to 0.15mV (i.e. at least -123.5dBm) for the squelch setting to...

  • Page 18: Test Equipment Setup

    MAXON SD-125 RF LINK MODULE PAGE-15- October 98...

  • Page 19: Alignment Points Diagram

    MAXON SD-125 RF LINK MODULE PAGE-16- October 98...

  • Page 20: Component Replacement

    MAXON SD-125 RF LINK MODULE surface mount component and any flux on the printed COMPONENT REPLACEMENT circuit board. COMPONENT REPLACEMENT Surface Mount Component Replacement Surface Mount Components Tin one terminal end of the new component and Surface mount components should always be replaced using the corresponding pad of the PCB.

  • Page 21: Trobleshooting Guide

    MAXON SD-125 RF LINK MODULE SIMPTOMS CAUSES COUNTERMEASURES 1. lncomplete connection 1. Check CON401 connection 2. Defective DC/DC VCC 2. Check U801 Unit does not work 3. Sv voltage source 3. 1C1 (Sv -0.2v) 4. PLL error 4. Check TCXOIVCO/PLL IC 5.

  • Page 22: Voltage Chart

    MAXON SD-125 RF LINK MODULE CONTROL CIRCUIT TRANSISTOR REF# Q401 Q402 Q403 Q404 Q405 Q406 Q407 Q408 RF BOARD TRANSISTOR REF# 18.0 18.0 18.0 18.0 18.0 18.0 PAGE-19- October 98...
  • Page 23 MAXON SD-125 RF LINK MODULE RF BOARD IC´S RECEIVE MODE Pin # IC3(OFF) IC7(OFF) IC8(OFF) OSC1 0SC2 AUDIO AUDIO AUDIO 0SC1 RF BOARD IC’S TRANSMIT MODE Pin # IC3(OFF) IC5(OFF) IC8(OFF) 1.88 1.88 1.88 AUDIO AUDIO 0SC1 PAGE-20- October 98...
  • Page 24 MAXON SD-125 RF LINK MODULE CONTROL CIRCUIT IC’S RECEIVE MODE IC402 IC403 IC404 IC405 IC406 IC407 IC408 PIN # AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO PIN # IC401 PIN # IC401 4.63 4.63 OSC2...
  • Page 25 MAXON SD-125 RF LINK MODULE CONTROL CIRCUIT IC’S TRANSMIT MODE PIN # IC402 IC403 IC404 IC405 IC406 IC407 IC408 AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO PIN # IC401 PIN # IC401 OSC2...

  • Page 26: Sd-125 Digital Board (Common) Parts List (650-010-0029)

    MAXON SD-125 RF LINK MODULE REF # DESCRIPTION _________ PART # REF # DESCRIPTION ________________ ____PART # C401 CAP, CER,1UF,+80-20%,16V,Y5V,0805 100-803-2105 C463 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 100-813-1104 C402 CAP, CER,0.001UF,10%,50V,X7R,0603 100-621-1102 C464 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 100-813-1104 C403 CAP, CER,0.022UF,10%,50V,X7R,0603 100-621-1223 C465 CAP, CER,0.0033UF,10%,50V,X7R,0603...
  • Page 27 MAXON SD-125 RF LINK MODULE REF # DESCRIPTION PART # REF # DESCRIPTION PART # R482 RES, TF,1K,5%,1/16W,+/-200,0603 741-102-1102 R418 RES, TF,10K,5%,1/16W,+/-200,0603 741-102-1103 R483 RES, TF,1K,5%,1/16W,+/-200,0603 741-102-1102 R419 RES, TF,10K,5%,1/16W,+/-200,0603 741-102-1103 R484 RES, TF,1K,5%,1/16W,+/-200,0603 741-102-1102 R420 RES, TF,9.1K,5%,1/16W,+/-200,0603 741-102-1912 R485(LK2.10) RES, TF, 0, 5%,1/16W, +/-200,0603 741-102-1000...

  • Page 28: Sd-125 (U1 400-430 Mhz)Rf Board Parts List (650-020-0027)

    MAXON SD-125 RF LINK MODULE REF # DESCRIPTION PART # REF # DESCRIPTION _______ PART # REPLACEMENT MODULES CAP, TA,10UF,20%,6.3V,3216,A 102-013-0106 ASSY, PCB,FRONT END,UHF,400-430MHZ 650-110-0019 CAP, CER,470PF,10%,50V,X7R,0603 100-621-1471 ASSY, PCB,PWR AMP,UHF,400-430MHZ 650-230-0017 CAP, CER,0.01UF,10%,25V,X7R,0603 100-611-1103 ASSY, PCB,TCXO 650-100-0002 C64 CAP, CER,470PF,10%,50V,X7R,0603...
  • Page 29 MAXON SD-125 RF LINK MODULE REF # DESCRIPTION PART # REF # DESCRIPTION PART # C909 CAP, CER,0.01UF,10%,25V,X7R,0603 100-611-1103 Q904 TRANS, NPN,KTC4075,UMT3 870-200-0031 FILTER, CER, LT-455FW,455KHZ 310-101-0010 Q905 TRANS, NPN,KTC4075,UMT3 870-200-0031 FILTER, CER,CF455HT,455KHZ 310-010-0013 R1 RES, TF,10K,5%,1/16W,+/-200,0603 741-102-1103 CON1 CONN, SKT,18P/DIP,2.0MMST,SMT...
  • Page 30 MAXON SD-125 RF LINK MODULE REF # DESCRIPTION PART # RES, TF,22K,5%,1/16W,+/-200,0603 741-102-1223 RES, TF,18K,5%,1/16W,+/-200,0603 741-102-1183 R76 RES, TF,10K,5%,1/16W,+/-200,0603 741-102-1103 R77 RES, TF,1.2K,5%,1/16W, +/-200,0603 741-102-1122 R78 RES, TF,22K,5%,1/16W,+/-200,0603 741-102-1223 R79 RES, TF,10,5%,1/16W,+/-200,0603 741-102-1100 R82 RES, TF,33K,5%,1/16W,+/-200,0603 741-102-1333 R83 RES, TF,20K,5%,1/16W,+/-200,0603 741-102-1203 R92 RES, TF,4.7M,5%,1/16W,+/-200,0603...

  • Page 31: Sd-125 (U2 440-470Mhz) Rf Board Parts List (650-020-0026)

    MAXON SD-125 RF LINK MODULE REF # DESCRIPTION PART # REF # DESCRIPTION PART # CAP, TA,4.7UF,20%,10V,A 102-023-0475 REPLACEMENT MODULES CAP, TA,10UF,20%,6.3V,3216,A 102-013-0106 ASSY, PCB,FRONT END,UHF,440-470MHZ 650-110-0017 C62 CAP, CER,470PF,10%,50V,X7R,0603 100-621-1471 ASSY, PCB,PWR AMP,UHF,440-470MHZ 650-230-0016 C63 CAP, CER,0.01UF,10%,25V,X7R,0603 100-611-1103 ASSY, PCB,TCXO...
  • Page 32 MAXON SD-125 RF LINK MODULE REF # DESCRIPTION PART # REF # DESCRIPTION PART # Q903 TRANS, PNP,KTA2014, USM 870-100-0018 C907 CAP, CER,0.01UF,10%,25V,X7R,0603 100-611-1103 Q904 TRANS, PNP,KTA2014, USM 870-100-0018 C909 CAP, CER,0.01UF,10%,25V,X7R,0603 100-611-1103 Q905 TRANS, PNP,KTA2014, USM 870-100-0018 CF1 FILTER, CER, LT-455FW,455KHZ...
  • Page 33 MAXON SD-125 RF LINK MODULE REF # DESCRIPTION __________ PART # RES, TF,470K,5%,1/16W,+/-200,0603 741-102-1474 RES, TF,22K,5%,1/16W,+/-200,0603 741-102-1223 R76 RES, TF,10K,5%,1/16W,+/-200,0603 741-102-1103 R77 RES, TF,1.2K,5%,1/16W, +/-200,0603 741-102-1122 R78 RES, TF,22K,5%,1/16W,+/-200,0603 741-102-1223 R79 RES, TF,10,5%,1/16W,+/-200,0603 741-102-1100 R82 RES, TF,33K,5%,1/16W,+/-200,0603 741-102-1333 R83 RES, TF,20K,5%,1/16W,+/-200,0603 741-102-1203 R92 RES, TF,4.7M,5%,1/16W,+/-200,0603...

  • Page 34: Sd-125 (V2 148-174Mhz) Rf Board Parts List (650-020-0029)

    MAXON SD-125 RF LINK MODULE REF # DESCRIPTION PART # REF # DESCRIPTION PART # CAP, CER,0.01UF,10%,25V,X7R,0603 100-611-1103 REPLACEMENT MODULES CAP, CER,470PF,10%,50V,X7R,0603 100-621-1471 FRONT-END ASSEMBLY (SEE NOTE 1) 650-110-0012 C65 CAP, TA,10UF,20%,10V,B,3528 102-023-1106 POWER AMP ASSEMBLY (SEE NOTE 1) 650-230-0012...
  • Page 35 MAXON SD-125 RF LINK MODULE REF # DESCRIPTION PART # REF # DESCRIPTION PART # CON1 CONN, SKT,18P/DIP,2.0MMST,SMT 140-020-0056 RES, TF,100K,5%,1/16W,+/-200,0603 741-102-1104 DIODE, PIN,UPP9401,(T&R)50V,2.5W 220-020-0001 RES, TF,2.2K,5%,1/16W,+/-200,0603 741-102-1222 D6 DIODE, PIN,UPP9401,(T&R)50V,2.5W 220-020-0001 R4 RES, TF,1.8K,5%,1/16W,+/-200,0603 741-102-1182 D9 DIODE, SCHOTTKY,CHIP,HSMS-2817#L31 220-040-0009 R5 RES, TF,1.8K,5%,1/16W,+/-200,0603...
  • Page 36 MAXON 0027) SD-125 RF LINK MODULE REF # DESCRIPTION PART RES, TF,10K,5%,1/16W,+/-200,0603 741-102-1103 RES, TF,1.2K,5%,1/16W, +/-200,0603 741-102-1122 R78 RES, TF,22K,5%,1/16W,+/-200,0603 741-102-1223 R79 RES, TF,10,5%,1/16W,+/-200,0603 741-102-1100 R82 RES, TF,33K,5%,1/16W,+/-200,0603 741-102-1333 R83 RES, TF,20K,5%,1/16W,+/-200,0603 741-102-1203 R90 RES, TF,300,5%,1/16W,+/-200,0603 741-102-1301 R91 RES, TF,300,5%,1/16W,+/-200,0603 741-102-1301 R92 RES, TF,4.7M,5%,1/16W,+/-200,0603...
  • Page 37 PAGE-34- October 98...

  • Page 38: Component Pinout

    PAGE-35- October 98...
  • Page 39 PAGE-36- October 98...
  • Page 40 PAGE-37- October 98...
  • Page 41 MAXON SD-125 RF LINK MODULE WIRING DIAGRAM Pin1 ..Audio In (Data RX) Pin2 ..Audio Out (Data TX) Pin3 ..PTT Pin4 ..GND (Ground) Pin5 .

  • Page 42: Wring Diagram

    page - 39...
  • Page 43 CON 404 OPTION CON 403 DATA PLL LOCK PLL ENB PLL CLK MOD INPUT N/S SE LECT MOD INVERT AUDIO TX En1 TX En2 RX ENB RSSI BUSY SD 120 LINK TABLE SD 125 DM-55 OPEN OPEN SHORT SHORT OPEN OPEN OPEN SHORT...

  • Page 44: Schematics, Block Diagram & Pcb´s

    REVISIONS G ND SD-125 RF SCHEMA TIC DIAGRAM ( V2 148-174MHz) 770-020-0029...

  • Page 45: Digital Board Schematic

    REV IS IONS DESCRIPTION DESCRIPTION REL EASED T O MANUF ACTUR I NG 1 0/98 SD-125 RF SCH EMA TIC DIAGR AM (U1 400-430M Hz) 770-020-0027...

  • Page 46: Rf Board (148-174 Mhz) Schematic

    REVISIONS DESCRIPTION DESCRIPTION RELEASED TO MANUFACTURING 10/98 SD -125 RF SCHEMA TIC DIAGR AM (U2 440-470MHz) 770-020-0026...

  • Page 47: Rf Board (400-430 Mhz) Schematic

    L205 VCO TX C21 2 R2 0 5 180n H 0 .00 1 2.2 K C2 1 7 Q2 03 2SC 508 4 S TR EENG OU T C 2 13 4 .7 P R2 04 2.2 K R2 06 10 0 Q20 2 C 208...

  • Page 48: Rf Board (440-470Mhz) Schematic

    L205 L205 C 2 12 C 21 2 VCO TX VCO TX R205 R205 33nH 33nH 220P 220P 2.2K 2.2K C217 C217 Q2 0 3 Q 203 2SC5084 2SC5084 STREENG STREENG (MCO) (MCO) C213 C213 R 204 R 2 0 4 2.2K 2.2K R 2 06...

  • Page 49: Tcox (148-174Mhz)

    4 4 4 C605 C608 0.001 33pF R602 R601 6.8K C601 C603 L601 680pF 56pF R603 C613 C616 C617 L607 Q601 C611 L604 39pF L602 L603 MMBR951 100pF C622 0.01uF C602 C604 C606 C607 R604 L606 39pF 100pF 39pF C612 120pF L605 D601...
  • Page 50 R501 R505 2.7K L506 2.2uH C515 Q502 Q501 MMBR951 BLT50 C505 0.01 C502 L502 L505 C501 L507 L508 27NH L509 L503 Q503 R509 150NH BLT52 R508 C509 R502 L504 L501 C504 C508 C513 C514 C507 8.2K 56NH R503 N/ F C517 R507 C503...
  • Page 51 Digital Board Assembly 416078A 650-010-0029 Digital Board Assembly 416078A 650-010-0029 PAGE 48...
  • Page 52 RF Board Assembly 416074A Rev. 06 148-174MHz 650-020-0029 RF Board Assembly 416074A Rev. 06 148-174MHz 650-020-0029 PAGE 49...
  • Page 53 RF Board Assembly 416074A Rev. 06 650-020-0027 (400-430MHz) 650-020-0026 (440-470MHz) RF Board Assembly 416074A Rev. 06 650-020-0027 (400-430MHz) 650-020-0026 (440-470MHz) PAGE 50...
  • Page 54 PAGE 51...

This manual is also suitable for:

Sd-125Sd-125u2 440-470

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