Standard Horizon GX1250SA Service Manual
  1. Manuals
  2. Brands
  3. Standard Horizon Manuals
  4. Transceiver
  5. ECLIPSE + GX1250SA
  6. Service manual
Standard Horizon GX1250SA Service Manual

Standard Horizon GX1250SA Service Manual

25 watts vhf/fm marine transceiver
Hide thumbs Also See for GX1250SA:
Table of Contents

Advertisement

Quick Links

See also: Owner's Manual
25 W atts VHF/FM Marine T ransceiver
GX1250SA
SER VICE MANUAL

Advertisement

Table of Contents
loading

Related Manuals for Standard Horizon GX1250SA

Summary of Contents for Standard Horizon GX1250SA

  • Page 1 25 W atts VHF/FM Marine T ransceiver GX1250SA SER VICE MANUAL...

  • Page 2: Table Of Contents

    CONTENTS 1. GENERAL INFORMA TION ........................2. THEOR Y OF OPERA T ION ........................2.1 Phase-Locked Loop (PLL) ......................2.2 Receiver ............................. 2.3 T ransmitter ..........................2.4 Power supply ..........................2.5 Control ............................3. DISASSEMBL Y ..........................3.1 Front case / chassis block removal ....................

  • Page 3: General Informa Tion

    STANDARD HORIZON, A DIVISION of Vertex Standard GX1250SA is a VHF/FM transceiver designed for use in the transmitter frequency range of 156.025 to 157.475 MHz and receiver frequency range of 156.050 to 163.275 MHz. The GX1250SA re- quires 13.8V for operation and has a switchable RF output power of 1 watt or 25 watts.

  • Page 4: Theory Of Operation

    2. THEORY OF OPERATION 2.1 Phase-Locked Loop (PLL) Refer to Figure 2-1. The Phase-locked loop (PLL) consists of VCO ZZ01, reference oscillator XP01, PLL IC QP02, and PLL loop filter QP04 and QP05. The microprocessor QL01 supplies the data, clock, and strobe signals determined by the operating frequency set by the UP/ DOWN keys.

  • Page 5: Receiver

    2.1.6 Unlock Detector Circuit When there is a phase difference between the reference and The PLL circuit is locked or unlocked (operational / not opera- programmable frequencies in QP02, the PLL circuit is unlocked tional) depending on the output of pin 7 of PLL IC QP02. and a 2.5 V level is output from pin 7 of PLL IC QP02.
  • Page 6 2.2.4 Second lF Circuit 2.2.6 Noise Squelch Circuit Refer to Figure 2-3. A portion of the audio signal from pin 11 of QR60 is applied to The first lF signal through pin 20 of second lF IC QR60 is the low pass filter comprised of RR64, RR65, RR63, CR63, applied to the second mixer in QR60.

  • Page 7: T Ransmitter

    2.2.7 W eather Alert 2.3 T ransmitter Refer to Figure 2-4. A portion of the audio signal from pin 11 of QR60 is applied to 2.3.1 Microphone Amplifier pin 3 of the tone decoder IC Q107. In order for Q107 to oper- Refer to Figure 2-5.
  • Page 8 2.3.2 TX Amplifiers Refer to Figure 2-6. The TX amplifier circuit consists of QT01 (pre-driver) and QT02 (driver). This circuit is used to amplify a transmitting RF signal of 1 mW from the VCO to 200 mW. The amplified signal is applied to pin 1 of final power amplifier QT03.

  • Page 9: Power Supply

    2.4 Power supply The power supply block is diagrammed below. (Figure2-7) Vcc (+13.8 V) QT03 pin 3 DC CABLE QT55 DC 13.8 V POWER SWITCH RG02 SWED +B Q101 QR02 LR04, LR30 +8V REGULATOR QP01 +8 V SWED+8V Q201 QP04 NJM7808FA QP05 RX +B switch...
  • Page 10 2.5 Control 2.5.1 Microprocessor QL01 The functions of the In/Out ports of microprocessor QL01 are listed below. Table 2-1 No. Port name S.I/O S.PD Signal name I/O Active Initial P.UP/DN Function P67 / AN7 I/O,A/D ---- PTT SW E-UP PTT Input terminal H : PTT Off / L : PTT On P66 / AN6 I/O,A/D ---- H/L CONT...
  • Page 11 Table 2-1 No. Port name S.I/O S.PD Signal name I/O Active Initial P.UP/DN Function 51 P03 / SEG19 I/O,SEG ---- SEG 4 ---- ---- ---- Segment 4 Output Terminal 52 P02 / SEG18 I/O,SEG ---- SEG 5 ---- ---- ---- Segment 5 Output Terminal 53 P01 / SEG17 I/O,SEG ----...
  • Page 12 2.5.2 Display connection EXP H I Figure 2-8 Segment connection diagram EXP H I Figure 2-9 Common connection diagram 2.5.3 LCD The microprocessor QL01directly drive the LCD QL15. QL15 is the dynamically-driven field-effect LCD (Liquid Crys- tal Display). 22 segment terminals and 2 common terminals with 1/2 duty ratio and1/2 bias drive the display system.

  • Page 13: Control

    (g) Remove the clamper(031B) from the chassis. The TX/RX P.C.board can be removed from the chassis. Sleeve case CAUTION When GX1250SA is assembled, apply Silicon Heat Trans- 016B fer Compound to the Transistor r, t, y and u. Front case block...

  • Page 14: Adjustment

    4.2 Activation of T est Mode 4.3 Activation Process This test mode is built in the microprocessor QL01 to ad- just, check and measure GX1250SA. The purpose of the test mode is for easy adjustment and quick confirmation of performance of GX1250SA.

  • Page 15: Vco Adjustment And Confirmation

    (a) For High Power, press PTT in CH16 and adjust RT51 to (marked “LOCK TP”) to 2.0V ± 0.05V DC. set RF power to 25.0W. (b) For Low Power, set GX1250SA at Low Power with H/L - Confirmation - key in CH16, press PTT and adjust RT51 to set RF power (a) Set channel to EXP04 with UP/DOWN key.

  • Page 16: Pll Frequency Adjustment

    4.6 PLL Frequency Adjustment 4.7 Modulation Level Adjustment and Confirmation Adjust transmission frequency and receiving local frequency. This section is to adjust modulation level on transmission. - Adjustment - Figure 4-6 - Adjustment - (a) Connect MIC tool (a tool for deviation measurement: de- scribed in Appendix 1, see page 19) to JL01.

  • Page 17: Receiving Local Level Adjustment

    4.8 Receiving Local Level Adjustment 4.9 Receiving Front-End Adjustment and Confirmation Figure 4-8 Figure 4-7 - Adjustment - - Adjustment - (a) Set the Spectrum Analyzer as below. (a) Turn SQL off. Set channel to CH06 (156.300MHz). center frequency : 159.000 MHz (b) Connect measurement cable to test point for local level span : 20.00 MHz...

  • Page 18: Receiving If Adjustment

    Adjustment”. Figure 4-10 - Adjustment - (a) Setup GX1250SA as shown in Figure 4-10 and set chan- nel to CH06 (156.300MHz). (b) With receiving the signal from Signal Generator, adjust LR30 and LR31 to the positions where reading value of DC voltage meter that is connected to the test point (marked “IF TP”) becomes highest.

  • Page 19: Receiving W Eather Alert Tone Adjustment And Confirmation

    Figure 4-12 emitted. Also check that deviation is not over ±2.5kHz at (a) Setup GX1250SA as shown in Figure 4-12. Press WX key that time (Scan stops and alert sounds). to set Weather Channel, then press Up/Down key to set (e) Press WX key and check that alert stops and voice is channel to WX10.

  • Page 20: Lcd V Isual Check

    JL03 with cable for adjustment, then power Setting Process of EXP CH on GX1250SA with pressing Down and Scan key. (b) Check that the initial status of memory backup is set as (a) Short-circuit the land that is marked “EXP” on the parts follows.

  • Page 21: Frequency List

    4.15 Frequency List - Channelization of USA, International and Canada - Channel Number Frequency [MHz] Channel Number Frequency [MHz] 156.050 156.050 156.025 160.625 156.050 160.650 156.075 156.075 156.100 160.700 156.075 160.675 156.150 156.150 156.125 160.725 156.150 160.750 156.125 156.125 156.200 160.800 156.175 156.175...

  • Page 22: Specifica Tions

    5. SPECIFICA TIONS Performance specifications are nominal, unless otherwise indicated, and are subject to change without notice. 5.1 General Channels ....................... All USA, International and Canadian Input Voltage ..........................13.8 VDC +/–20% Current Drain Standby ............................... 0.5A Receive ............................... 1.5A Transmit ...........................

  • Page 23: P Arts List

    6. P ARTS LIST Parts list The parts list contains information on electrical and mechanical parts. Electrical parts are listed first, followed by mechanical parts. Chip parts Part numbers whose first three characters correspond to the following codes indicate chip parts. -Capacitors- -Resistors- -Semiconductors-...
  • Page 24 REF. REF. Q’TY PART NO. DESCRIPTION Q’TY PART NO. DESCRIPTION DESIG. DESIG. P101 TX/RX P .C.BOARD P101 TX/RX P .C.BOARD ±10% P001 WG175B1003 TX/RX P .C.BOARD KIT CP23 DK96102300 1000 pF ±10% P101 WG175B1013 TX/RX P .C.BOARD CP24 DK96102300 1000 pF ±10% CP25 DK96102300...
  • Page 25 REF. REF. Q’TY PART NO. DESCRIPTION Q’TY PART NO. DESCRIPTION DESIG. DESIG. P101 TX/RX P .C.BOARD P101 TX/RX P .C.BOARD ±10% CT50 DK96102300 1000 pF Q101 HC10120050 TA7252AP 1 µF / 50V CT51 EY10505020 Q102 HZ20009210 DAN202U CT52 DD99010300 1 pF Q103 HZ20008210 DA204U...
  • Page 26 REF. REF. Q’TY PART NO. DESCRIPTION Q’TY PART NO. DESCRIPTION DESIG. DESIG. P101 TX/RX P .C.BOARD P101 TX/RX P .C.BOARD 56 Ω ±5% ±5% R101 NN05560610 1/16W RR30 NN05332610 3.3 kΩ 1/16W 330 Ω ±5% ±5% R102 RI05331180 1/8W RR31 NN05102610 1 kΩ...
  • Page 27 REF. REF. Q’TY PART NO. DESCRIPTION Q’TY PART NO. DESCRIPTION DESIG. DESIG. PL01 CONTROL P.C.BOARD PL01 CONTROL P.C.BOARD ±5% P002 WG457X2000 CONTROL P.C.BOARD KIT RL11 NN05102610 1 kΩ 1/16W ±5% PL01 WG457X2010 CONTROL P.C.BOARD RL12 NN05473610 47 kΩ 1/16W 100 Ω ±5% RL13 NN05101610...
  • Page 28 REF. REF. Q’TY PART NO. DESCRIPTION Q’TY PART NO. DESCRIPTION DESIG. DESIG. PG01 VOL P.C.BOARD PG01 WG457X2020 VOL P.C.BOARD RG01 RB02030380 20 kΩ SQL RG02 RB12030390 20 kΩ Volume & Power Switch WG01 YB00071450 6pin CABLE TX/RX PCB to VOL PCB PV01 VCO P .C.BOARD ZZ01 ZZ175B0010...
  • Page 29 REF. REF. Q’TY PART NO. DESCRIPTION Q’TY PART NO. DESCRIPTION DESIG. DESIG. MECHANISM PACKAGE 001B 457X064010 FRONT CASE [WHT] 001S 457X801010 PACKING CASE 001B 457X064110 FRONT CASE [BLK] 002S 457X809010 PACKAGE CUSHION 002B 457X158010 WINDOW 003S 457X108020 PACKAGE SEAL [BLK] 003B 444X202010 SPEAKER NET...

  • Page 30: Exploded P Arts View

    7. EXPLODED P ARTS VIEW 0 1 7 B 0 2 6 B 0 1 5 B x 4 P L 0 1 0 1 6 B 0 2 8 B x 2 EG3 0 J L 0 4 0 0 3 B QL 1 5 0 1 4 B x 3 0 0 1 B...

  • Page 31: P Acking Diagram

    8. P ACKING DIAGRAM 0 0 4 V x 8 0 0 7 V 0 0 3 V x 4 0 0 5 V x 4 0 0 2 V x 2 0 0 6 V x 4 0 6 0 B U0 0 A B 0 0 1 S 1 ONL Y 0 1 2 V 0 0 3 S...

  • Page 32: Block Diagram

    9. BLOCK DIAGRAM P101 RX/TX CRYSTAL JT01 ANTENNA SWITCH B.P.F. RF AMP B.P.F. FIRST MIXER FILTER FIRST IF AMP ANTENNA CONNECTOR 21.4MHz QT04 QR02 QR04 FR30/FR31 QR30 L.P.F UN9401 2SK508(K53) 2SK508(K53) 21.4MHz 2SC2714(Y) TX: 156.025MHz ∼ 157.425MHz TX: 156.025MHz RX: 134.650MHz RX: 156.050MHz ∼...

  • Page 33: Comprehensive Wiring Diagram

    10. COMPREHENSIVE WIRING DIAGRAM EG30 SPEAKER YT50 JT01 ANTENNA CONNECTOR CT64 P101 RX/TX CT63 QT03 JT01 RT51 ZZ01 VCO ZZ01 VCO LR01 RT53 LOCK V RX+B ERROR CP08 LR02 WG30 VCO ADJ. LR07 LV03 TX+B LR08 LR04 IF TP WG457X2030 (Shown from solder side) R109 RM12...

  • Page 34: Schematic Diagram And Component Overlay

    11. SCHEMATIC DIAGRAM AND COMPONENT OVERLAY P101 RX/TX F,E(FRONT END) QR04 21.4MHz X TAL FILTER JT01 1st MIX LR31 LR30 2SK508(K53) FR30 FR31 QR30 1.3V∼2.1V TIGHT 1st IF AMP CT63 0.001 2SC2714(Y) LR01 CR03 LR02 QR02 LR04 CR09 LR05 CR11 LR06 QT03 BOOSTER...
  • Page 35 Q110 QP03,Q204,Q106 Q111 P101 RX/TX RT56 LT03 LT01 CT10 CT09 CT04 CT03 RT04 RT03 LT04 CT69 RT51 RT53 RP04 CP08 CP04 C204 R202 RM03 RM14 CM05 RM07 RR67 CM03 R110 R111 R108 C114 R118 WG175B1013 (Shown from component side) Look Pattern A (Red) Pattern A = Component side pattern...
  • Page 36 Q104,Q105 QR62 QT03 P101 RX/TX QT55 QT57 QT58 CT61 QT56 CT53 RT08 LT06 RT57 RP10 CT67 CP11 CP12 CR01 QT52 C106 RT50 CT52 RP09 CT66 RP11 CT50 CR02 RT54 LT08 CP01 RT61 C105 RT59 CP26 CR72 LR01 CT51 C120 C104 CR03 RR07 RR01...
  • Page 37 PL01 CONTROL JL04 ZEBRA CONNECTOR LL01 LK1U QL08 QL02 QL04 02CZ4.7Z CL-190Y-CD-T FY1101F-TX QL03 QL05 CL-190Y-CD-T FY1101F-TX RL07 RL08 QL15 SEG10 LCD25 RL09 SEG11 DATA RL10 SEG12 SEG13 RL11 SEG14 RL12 TX CONT SEG15 RL13 SEG16 RL14 SEG17 SEG18 RL15 BEEP QL01 SEG19...
  • Page 38 PL01 CONTROL RL42 RL43 QL14 JL01 RL44 RL24 CL15 RL39 LL01 RL37 QL06 QL01 CL03 QL09 XL01 RL29 RL03 RL31 QL10 RL07 RL32 RL40 RL08 RL33 RL09 QL07 CL09 CL11 CL10 QL13 QL11 RL35 QL12 QL06 QL08 RL05 CL04 RL23 PG01 VOLUME JL03 Look...
  • Page 39 © 2000 VERTEX STANDARD CO., LTD All rights reserved No portion of this manual may be reproduced Marine Division of VERTEX STANDARD with the permission of US Hedqurters 1720 Edwards Rd., Cerritos, CA 90703, U.S.A. VERTEX STANDARD CO., LTD printed in Japan 457X855010 2001/06...

Table of Contents