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ST-2112D Service Manual - SmarTrunk Systems, Inc.

1. 14 5 4 MAIN RADIO ALIGNMENT en a an en 15 5 5 TRANSMITTER ALIGNMENT 15 5 5 1 e E PO ee ee 16 5 5 2 Transmit Power alignment LLL LLULLU ee 17 57 21120 SM 1 2 SMARTRUNK SYSTEMS INC 9 9 2 1 High POWERLEVELALIGNMENT une 17 5 9 2 2 Mid POWER LEVEL LIGNMENT en 18 5 5 2 3 LOW POWER LEVEL ALIGNMENT 00000 18 5 5 3 ANALOG MAXIMUM DEVIATION 18 5 5 4 Modulation Gain alignment cea 18 5 5 5 FDMA DATA MODULATION alignment 19 5 5 6 TDMA DATA MODULATION alignment 20 dd TOMES Level Alignment laica 20 5 5 8 DTMF signaling level alignment rra 20 5 5 9 DCS signaling 21 5510 BS 21 55 11 AP ______ _ ___ 22 5 6 RECEIVER ALIGNMENT 8 23 50 1 23 6 COMPLEMENTARY RADIO 24 Orla BATIERY WARNING 24 7 COMPLIMENTARY USER 25 Tela OPHONAEIGNMEN uu in OE 25 7 1 1 ANALOG MICrophone pain 25 7 1 2 ANALOG External Mic Gala 25 z ANALOG AU Corsa 26 7 1 4
2. 51 PORT E E 53 ST 2112 SERVICE MANUAL REVISIONS 55 ST 2112D SM 1 2 SMARTRUNK SYSTEMS INC m 1 Specifications n Auto aw Specifications subject to change without notice or obligation 5 Adjacent Channel Power 65dBC typ R Emissions 8K30F7E 8K30F7D lt LLI LLI O gt WY lt Lu Lu O Lu 2 ST 2112 EXPLODED VIEW REAR COVER 2 57 2112 EXPLODED VIEW SW GROUND PLATE BATTERY FRONT HOUSING ANT RUBBER SEAL CHANNEL KNOB EMG RUBBER KEY VOL KNOB LCD DISPLAY MAIN CHASSIS MAIN CHASSIS RUBBER PAD 36 MAIN CHASSIS O RING _ 1 SZER LED LIGHT BAR K 28 MICPHONE PCB BRACKET 10 FUNCTION RUBBER KEY MIC RUBBER CAP NN SmarTrunk AS VJ Systems Inc J EXPLODEDRAWING gt x TOLERANCE UNLESS OTHERWISE STATED CHECKED DATE M D Y 7 HE PART No DRAWN Jack Chang DISPLAY PLATE FRONT HOUSING AUX RUBBER PAD AUS REN 3 ST 2112 SIMPLIFIED DIAGRAM CTRL mm U3 Power Buffer AntS Dri Wd Detection AMP c AMP D2 1 01 4 Q2 I CLOCK Audio Processor U5 PWM VOCODER U6 Main Proces
3. _ 151 152 TioonF 30 28 R98 4K7 2 153 154 _ 155 156 Joone hor PROCESSOR POWER SUPPLY 5V 019 7233 227 hour OuF o o qu N IN a LI 1 1nF 5V F 100 0 0 CZ Al 47pF 47 D4 L16 HSM88AS 1 POWER CONTROL MAIN CLOCK C88 PROCESSOR CLOCK PWCTRL nF 56K R41 i C97 E R79 ANN PWR_TUNE C169 47 M s E 3 4 cosa 96 x2 100 MCP6241U 100_ 2 2 E 10uF 10nF 1nF 100nF 2 2 1nF 2 1 1uF 16Mhz C140 RER 100nF MODEM CODEC 3VA Gi d mos MSO VEAL 10 3VD SIDE L__ E oo C10 244 6105 6106 55 01 RANNE ONE Hour hour sexe elem i SIDE UP US 90595 49 10 C40 4 x R134 E 132 AA 122 lt 0 0 lt 029550 i soek 120 121 nF ink i 2 36 R574 22K 119 1 __ E x SMOSI 6 PWCTRL oonF hour fink
4. OF e C4 U3 BV HT7233 11 1 10 GPS 3 13 104 3VD VBL SMARTRUNK SYSTEMS INC itle ST 2112 FRONT BOARD ize Document Number Rev B DM 1001 111026 Date Wednesday August 29 2012 heet 1 of 1 11 ST 2112 COMPONENT LOCATOR LAYER REID oloJolo EE Es zje 12 ST 2112 COMPONENT LOCATOR BOTTOM LAYER ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC gt 13 ST 2112 PCB TOP LAYER ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 14 5 2112 PCB BOTTOM LAYER ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 15 ST 2112 PCB GROUND LAYER ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 16 51 2112 17 517 2112 FRONT BOARD COMPONENT LOCATOR TOP LAYER JP2 us H 31 9 R23 R e nmin A 2 Re N N 10 Re 8 57 21120 SM 1 2 SMARTRUNK SYSTEMS INC n 18 ST 2112 FRONT BOARD COMPONENT LOCATOR BOTTOM LAYER Q 5 5 5 O rel 57 21120 SM 1 2 SMARTRUNK SYSTEMS INC 19 ST 2112D BOM NAME DESCRIPTION VALUE RANGER PN ____ __ EPL211010D CAP CER 10UF 6 3V X5R 20 0603 CAP CER 4 7UF 6 3V 20 X5R 0402 ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 57 21120 SM 1 2 SMARTRUNK SYSTEMS INC C203 CAP CER 150PF 100V 10 NP0 0603
5. aa 26 7 1 5 MINIMOM VOLUME LEVE LU L u ____ ___ _ 27 7 1 6 SOUFLE H LEVEE oree a E E E E E AE 27 7 1 7 DISABLE RP POWER i u ic 27 8 RADIO APPEARANCE ALIGNMENT 28 9 1 DISPEAYSAND 28 8 1 1 Auto backlight delay alignment uuu u 28 8 1 2 EAN qc 28 51 21120 SM 1 2 SMARTRUNK SYSTEMS INC 8 1 3 29 S2 AP Pe ___ 29 3 ANNUNCIATIO u ee 29 A S C C DAP OPEN 32 10 S 2112 FROM BOARD SCHEMATIC u l uu u a ice 33 ST 2112 COMPONENT LOCATOR TOP LAYER 34 ST 2112 COMPONENT LOCATOR BOTTOM LAYER 35 TOP LAYER e H 36 SE 2112 PCBBOTFOM NE YP uuu 5 5 5 44 37 51 2112 GROUND LAVER nenn ea ee naeh 38 ST 2112 POB POWER 39 57 2112 FRONT BOARD COMPONENT LOCATOR LAYER 40 57 2112 FRONT BOARD COMPONENT LOCATOR BOTTOM LAYER 41 SL 2112 m 42 ST 2112 KEYBOARD amp DISPLAY BOM
6. Press to store it in the file The value will be updated after the file is transferred to the radio 7 1 7 DISABLE RF POWER Use this box to check when you do not want to use the RF power amplifier It is commonly used for dealers to make a demonstration of the radio features without interfering to any other existing user in the frequency or for operation without antenna connected to the radio SMARTRUNK SYSTEMS INC disable the RF power amplifier check the box Disable RF Powerfor Lab demo Press OK to store it in the file The value will be updated after the file is transferred to the radio 8 RADIO APPEARANCE ALIGNMENT Radio appearance can be customized as per user requirement Select Edit then appearance from radio top toolbars to access to the appearance screen i SDR Programmer and Alignment Software 123 0 123 0 Ed asswords ontacts 4 off ital Profiles E aa o F i SDR Programmer and Alignment Software a File Edit Radio Help i Bank Display Leds Tones Anna ounciation s Display 9 f 4 4 CA Model 572112 VHF FW Versio ESN Last Prog of o A soon Appearance option is selected a new window will pop up
7. SmarTrunk Systems Inc ST 2112D 450Mhz 520Mhz UHF FM DIGITAL TRANSCEIVER SERVICE MANUAL SmarTrunk Systems INC ST 2112D SM R1 2 Table of Contents le ee nee 5 Ze 8 6 3 5152112 nennen en 7 DESCRIPTION ea 8 OANE U 222 9 22 RECEIVE oni ninia iii 9 4 2 1 GIN etario out 9 4 2 2 ANALOG Audio Processing 9 4 2 3 gd ESA AAA A ee ee 9 4 2 4 Virtual VOLUME CONTROL uuu uuu E 10 4 2 5 a Udo 10 4 2 6 ANALOG AUDIBLE SIGNALING 10 4 2 7 DIGITAL AUDIO PROCESSING gt 10 Ae Qy m O GE 11 4 3 1 ANALOG TESIGNA Lera ee 11 4 3 2 AUDIO u u uuu ee 11 4 3 3 Drive and Final Amplifier Stages rr nnns 11 4 3 4 Automatic Transmit Power Control 12 EA A 13 a EE m 13 za ANGNMENT GOA uu u u unn us 13 9 9 uu PER PU i 14 5 3 1 GENERAL ALIGNMENT CONSIDERATIONS
8. ST 2112D SM R 1 2 8 1 DISPLAYS AND LEDS This screen lets you adjust the behavior of the display and keyboard backlight 8 1 1 Auto backlight delay alignment The auto backlight mode automatically set on power off status to the backlight after any event to reduce the battery demand To change the value of the delay before the backlight is powered off please enter the quantity of desired seconds for it Display Auto Backlight s 5 Power Text Smartrunk 8 1 2 Power on Text Type here the text to show on the display when the radio is powered on This string is very convenient for radio identification dealer advertising at the time the radio is powered on SMARTRUNK SYSTEMS INC The option to activate deactivate the power on text is disabled 8 1 3 Leds Future version will allow the user to disable the function of Rx and TX led Some application as security sometime demands no lights on the radio 8 2 Second folder appearance screen allows the user to adjust the tones which are played back in any event 91 Apparence Display Leds Ton Kay PTT De Key PTT Keypad Pre Alert Rotary Tones can be changed by the dealer Check Key PTT if you want to play back a tone to acknowledge any time PTT key is pressed Check De Key PTT if you want to play back a tone to acknowledges any time PTT is released Check Keypad if you want to pla
9. CK1471AK4A ST 2112D SM 1 2 SMARTRUNK SYSTEMS INC C20 ST 2112D SM 1 2 SMARTRUNK SYSTEMS INC 156 CAP 1 0UF 6 3V X5R 20 0402 CAP CER 15 250V 10 SMD 0603 CAP CER 5PF 250V COG SMD 5 CK9050AD1A ST 2112D SM 1 2 SMARTRUNK SYSTEMS INC n C193 CAP CER 47PF 50V 1 NPO 0402 CAP CER 47PF 50V 196 NPO 0402 CAP CER 56PF 50V 1 NPO 0603 D pope RBB86CS EDRB886CSY D4 __ SILICON SCHOTTKY BARRIER DIODE HSM8SAS EDHSMOOBBA _ D6 __ DIODE SWITCH 80V 100MAEMD3 DAN222 EDDANO222Y LTST LED GREEN RED BICOLOR 0606 SMD Serra s sees t8 __ 0 0 OHM 1 10WJIUMPOGO3 RCV0600047R t14 RES0 00HM1 10WJUMPOGO3 6006000478 _ L7 RESO OOHM1 10WJUMPO603 6006000478 _ 15 Fixed Inductors Air Core RF Inductor 13 7 nH 5 2 7 ME Fixed Inductors Air Core RF Inductor 13 7 5 2 7 25K3476 TY2SK34762 ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 04 ___ TRANS PREBIAS 150MW VMT3 TYDTALIAEM _ 860 RES 10K OHM 1 160 5 04025 0 RCY04034 R90 RES 10K OHM 1 16W 5 04025 0 1 60410347 _ R94 RES1OKOHM1 16W 5 04025MD_ 860410342 RES 1 0 OHM 1 16W 5 0402 SMD R6 RES LOK OHM 1 16W 5 04025MD 0410247 RES 1 0K OHM 1 16W 5 0402 SMD R9 __ RES 1 0K OHM 1 16W 5 0402 SMD RES 1 0K OHM 1 16W 5 0402 SMD RES 1 0K OHM 1 16W 5 0402 SMD RES 1 0K OHM 1 16W 5 040
10. Default m o This will set all the aligment values to its factory values Are you sure SMARTRUNK SYSTEMS INC 5 5 2 Transmit Power alignment ST 2112 has three power levels to be selected for each channel High medium and low power level can be aligned as per radio usage requirement For power alignment you can do a fine tuning as per your desire frequency sub band The software lets you linearize the complete band cutting the complete band into five steps to let you focus into your frequency bands Even when the software has already assigned the most convenient frequency points to consider the alignment you still can enter exactly the frequency of your interest 9 9 2 1 High POWER LEVEL ALIGNMENT To mn Power level select Software automatically retrieves actual level to the alignment slider 00 1 Low Max Deviation Battery Waming Level Main Clock Adjust ElA Tones Level Discriminator Gain Modulator Gain FDMA Deviation TDMA Deviation DTMF Level Power Medium Level Power Low Level DCS Level CTCSS Level Frecuency This level has been aligned in factory but you still can adjust it as per your desires realign please select Start then move the slider or introduce the ST 2112D SM R 1 2 value manually at the time you check the real transmit power on the wattmeter connected t
11. INC R104 RES 20 OHM 1 8W 5 0805 R96 RES 3 3K OHM 1 16W 5 0402 SMD RES 2 2 OHM 1 16W 5 0402 SMD SW KEY PUSH SWITCH SMD YM061 EWPS33083X CRYSTRAL 16MHZ 3 3V TCXO 0 5PPM 16Mhz on 20 ST 2112 KEYBOARD amp DISPLAY BOM ITEM DESCRIPTION SMTK PN ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC resistor 330 ohm 0402 RCYO433142 6 9 RESISTOR1K 0402 RCYO410242 8 5 RESISTOR47K 0402 0447242 9 1 RESISTOR22K 0402 RCYO422342 15 8 120053 20140205 16 FUSE0 2A32V 0402 EXO2Y40259 ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 21 ACCESSORY PORT In the side of the radio you will find four connectors 1 USB USB 2 0 compliance mini USB 2 External mic External PTT and RX serial data 2 5mm RX Serial TTL Mic PTT 3 External Speaker TX serial data 3 5mm Speaker TX Serial TTL 4 Accessory port Pin Function Comments ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 22 ST 2112 SERVICE MANUAL REVISIONS AUTHOR RELEASE DATE 5 DANIEL MARTIN JUN 2013 INITIAL RELEASE VERSION DANIEL MARTIN JUN 2013 ADDED SOFTWARE ZONE SPECIFICATION Copyright 2014 Printed in Malaysia www smartrunk com ST 2112DSMR1 2 ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC
12. Note Signal levels in dB referred to in the alignment procedure are based on 0 dBm 1 mV 5 3 1 GENERAL ALIGNMENT CONSIDERATIONS Evenly if the radio is powered off the alignment software will detect it but some of the test cannot be performed correctly Please be sure you turn the radio on before continue with this alignment procedure SMARTRUNK SYSTEMS INC In case the battery has not enough charge the test will be aborted by the software Please ensure the battery has more than 50 of remaining charge to complete the test 5 4 MAIN RADIO ALIGNMENT Before setup any parameter run SDR programming software then select Radio Alignment from top bar menu S SDR Programmer and Alignment Software CAUsers DANIEL DropboxiRuslan Template USER1002C rev2 SDR ali File Edit Radio Help E Read Radio F2 Andrew un 4 4 11 KEEN KEE 42407500 0 42407500 0 42217500 0 42407500 0 42217500 0 42217500 0 S o I 3 I B oeg m ir 4 A complementary message will be displayed on the time the software detects the radio connected to USB port on the computer Connecting ST 2112D SM R 1 2 If the radio isn t connected then the program will
13. be timed out after 20 seconds As soon as the radio is detected actual radio parameters are loaded Once the radio is connected a new screen pops up showing all alignment parameters The software downloads actual alignment parameters stored into radio memory so the information displayed on each alignment step is the real value form the previous alignment The radio also stores in a special memory area original values assigned in factory You can go back to those values anytime for any particular alignment step In case the radio is password protected dealer password is required to access to this alignment menu At any time press to end the alignment procedure then the radio will returns to alignment menu For any transmit related alignment parameter low power will be used 5 5 TRANSMITTER ALIGNMENT SMARTRUNK SYSTEMS INC 7 5V Power Supply PC compatible Setup the test equipment as shown for transceiver alignment apply 7 5 V DC power to the transceiver The RF parameters are typed on the alignment software to facilitate the alignment within all radio band avoiding special programming of the radio before start alignment procedure Al parameters can be aligned without relationship to any other so there is no an order to align On this way you can adjust only
14. confirm ST 2112D SM 1 2 the factory default alignment and then if you confirm it original values from factory will be loaded into current alignment settings 5 5 5 FDMA DATA MODULATION alignment To align 4FSK signaling deviation for FDMA mode select on Alignment screen Actual alignment value will be qu Max Deviation Battery Waming Level Main Clock Adjust EIA Tones Level Discriminator Gain Modulator Gain Deviton Deviation DTMF Level Power High Level Power Medium Level Power Low Level DCS Level CTCSS Level displayed on alignment slider Press Start then move the slider to reach the desired value at the time you checks the deviation meter to reach the desired signaling level for narrow band operation Radio will generate a 1000Hz reference tone for alignment proposes As soon the desired value is reached press Finish to store the value on radio memory 1 you want to retrieve factory default press Factory instead of Start You will be asked to confirm the factory default alignment and then if you confirm it original values from factory will be loaded into current alignment settings SMARTRUNK SYSTEMS INC 5 5 6 DATA MODULATION alignment To align 4FSK signaling deviation for TDMA mode select on Alignment screen Max Deviation Battery Waming Level Main Clock Adiust EIA To
15. the desired parameter avoiding to waste time realigning other parameters than required Before proceed to align any parameter a desired frequency must be loaded into both TX and RX Evenly when the radio has stable characteristics for all bandwidth it is recommendable to align on middle of the radio working band 5 5 1 Main Clock alignment To align the main clock for radio Tx and RX please select Main Clock EN option Alignment screen 51 21120 SM 1 2 siguen esa Max Deviation Battery Waming Level Main Clock Adjust ElA Tones Level Discriminator Gain TDMA Deviation DTMF Level Power High Level Power Medium Level Power Low Level DCS Level CTCSS Level Fig 12 alignment menu Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you checks the Frequency Counter to reach the desired frequency as shown on Frequency field of the alignment screen As soon the desired value is reached press Finish to store the value on radio memory If you want to retrieve factory default press Factory instead of Start You will be asked to confirm the factory default alignment and then if you confirm it original values from factory will be loaded into current alignment settings This confirmation screen will appears any time you want to realign any parameter to Factory Default
16. 1 5 MINIMUM VOLUME LEVEL This alignment lets the user to ensure the speaker level should be audible evenly when the volume control potentiometer is fully closed counter clockwise Minimum volume level can be aligned up to 250 max step 1 7 1 6 SQUELCH LEVEL ST 2112 supports individual squelch alignment for any channel to be programmed individually on each frequency defined into the frequency chart of each bank On this way the user can set a higher threshold level for noisy channels and lower for clear channels Once programmed if due to the proximity of the radio to a noisy environment the squelch level is not high enough the user can adjust a common reference for all the channels in the radio by adjusting the general squelch level ST 2112D SM R 1 2 Option screen on the edit menu lets you to program the default squelch reference all the channels This value can adjusted on the fly for the user if the dealer program on squelch control key or navigating through the radio menu To set a desired squelch reference please select you desired squelch level form the list so ss Minium Volumen Level 0 255 20 AGC J 00 0 dB 00 0 dB Squelch Level dBm 8 7 i 64 68 AGC 72 76 00008 Bd PTT Gain 000068 83 Backup E 7 Disable RF Powerfor Lab demo 92 Roger Beep 4 129 131 ME aS 15
17. 15nH a 34 T C 8pF D8 LTST C195KGJRKT 1 3 2 4 hooprhoopr fine hos hor Der hor AUDIO POWER SUPPLY BE DHL D6 DAN222 RDA POWER SUPPLY 5V R124 4 AA 2 2 cavRL RADIO PWR_TUNE TEMP ka i bs R1 R11 E L1 2 10 47K 4 LCB1608 600 nF EAD OnF 55 RTI 100nE _ 1 cia 16 819 50pF 10nF 2 21 10K R21 1uF 150pF iuF 216 1nF 47 27nH 150pF R23 150pF 470 18 150 256 24 79 1 r 1 0 e Q3 100pF 255 82 C29 35 36 37 38 9 NG 15pF E 7V TEV R8 100 47nH 13nH 13nH 0765 D3 BAR63 REFERENCES BLUE VALUES CORRESPOND TO ST 2112V PINK VALUES CORRESPOND ST 2112C GREEN VALUES CORRESPOND TO ST 2112V IF COMPONENT IS DIFERENT BETWEEN THE DIFERENT MODELS THEN YOU WILL FIND THREE VALUES UNDER THE COMPONENT 2 4pF 57 2 4pF 8 7 8pF OpF pF pF 8pF F F csvoc IRQVOC 18V E T hoon nF 134 6135 136 00nF 7uF 100 117 49 C13 118 ENABXTAL XTALSEL3 XTALSEL2 XTALSEL1 RESETC IOVDD VSSREF INPP INPN AVDD XTALIN VSS SYNC 25 150
18. 2 SMD RES 1 0K OHM 1 16W 5 0402 SMD R64 RES 1 0K OHM 1 16W 5 0402 SMD ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC R65 RES 1 0K OHM 1 16W 5 0402 SMD R66 RES LOK OHM 1 16W 5 0402 1K RCYO410242 R69 RES 1 0K OHM 1 16W 5 0402 SMD RES 1 0 OHM 1 16W 5 0402 SMD RES 1 0K OHM 1 16W 5 0402 SMD RES 1 0K OHM 1 16W 5 0402 SMD RES 1 0K OHM 1 16W 5 0402 SMD R73 RES0 00HM1 1wodo2sMD 0 RCYOA0004 RZ5_ RES0 00HM 1 16 0402 RCY0400042 R77 RES0 00HM 116 0402 RCY0400042 878 RESO 0OHM1 16W04025MD_ __ RCYO400042 R80 RESO OOHM1 16W04025SMD_ 0 RCY0400042 C60 RES0 0 OHM 1 16w 04025MD __ RCYO400042 _ RES0 00HM1 16wodo2sMD 1 RCY0400042 C161 RESO OOHM1 16W04025MD_ 0 RCYO400042 RB RES100OHM 1 16W5 04025MD 100 RCYO41014Z R44 RES 100 OHM 1 16W 59604025MD 100 RCY04014 R46 RES47KOHM 1 16W 59604025MD RCYO447342 ST 2112D SM 1 2 SMARTRUNK SYSTEMS INC n R38 RES 22K OHM 1 16W 5 0402 SMD RES 22K OHM 1 16W 5 0402 SMD RES 22K OHM 1 16W 5 0402 SMD RES 47 OHM 1 16W 5 0402 SMD 840 RES 47 OHM 1 16W 5 0402 SMD RES 47 OHM 1 16W 5 0402 SMD RES 2 2K OHM 1 16W 5 0402 SMD RES 2 26 OHM 1 16W 5 0402 SMD RES 10 OHM 1 16W 5 0402 SMD RES 10 OHM 1 16W 5 0402 SMD RES 10 OHM 1 16W 5 0402 SMD RES 4 7K OHM 1 16W 5 0402 SMD RES 4 7K OHM 1 16W 5 0402 SMD ST 2112D SM R 1 2 SMARTRUNK SYSTEMS
19. E omer 34 3VA a FT PS sun i HEADER 2 3 SMSO SR i 4 505 R60 50 pese pase 5 BOOTEN R2 59 pm Hour hour 17 hok i 8 DVSS 1g A cs 1 9 2 R66 2 10 159 1uE FP GPIOA _ ergo piat 6157 128 _ 28 R69 IK F jm jw jw u Tea een HEADER 2 88821590238 ie 43 RX ED 48 R74 10uF outr 7 R75 0 SIDE DOWN nF Ma 1 18 0 R78 radna 1 e L 18V 3VR P12 P15 h HEADER 1 gt C142 C143 inF NC HEADER 1 HEADER 1 R136 EMERGENCY P13 3VA nF Nc VAF 1 2 Ly 20 1 h P16 5 1 4 7 4 1 J3 Sw amp i 894 895 896 ds SW KEY YM06 i HEADER 1 10 10K 3K3 i 3VD HEADER 1 158 7 i 14 5V Tur 8 5 0 e 1 2160 sPEECH je 1 kr Oq fF E00 C161 Ef HEADER 1 1 1 162 C163 C164 2165 P8 1 1 m cim Tor Tor T woo er NC E a Ne HEADER 1 HEADER 1 AUDIO BA 5 P9 4 MOD2 1 MOUT Y HEADER 1 HEADER 1 LA 10 E ee pn ad P AUDIO 1 1 TUNE po gt 7824
20. alues from factory will be loaded into current alignment settings 5 5 9 DCS signaling alignment DCS signaling encoded from ST 2112 must be aligned by selecting alignment option from the alignment menu ST 2112D SM R 1 2 Battery Waming Level Main Clock Adjust Discriminator Gain Modulator Gain Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you check the deviation meter to reach the desired signaling level for narrow band operation Radio will generate 134 4Hz audio tone for alignment proposes As soon the desired value is reached press Finish to store the value on radio memory If you want to retrieve factory default press Factory instead of Start You will be asked to confirm the factory default alignment and then if you confirm it original values from factory will be loaded into current alignment settings 5 5 10 CTCSS signaling alignment CTCSS signaling encoded from ST 2112 can be aligned by selecting alignment option from the alignment menu SMARTRUNK SYSTEMS INC Er Battery Waming Level Main Clock Adjust ElA Tones Level Discriminator Gain Modulator Gain FDMA Deviation TDMA Deviation Level Power High Level Power Medium Level Power Low Level DCS Level FSK Mod Level m Actual alignment value will be display
21. cross the frequency range depending for each version Realignment should therefore not be necessary except in the event of a component failure or altering version type All component replacement and service should be performed only by an authorized SmarTrunk representative or the warranty policy may be void The following procedures cover the sometimes critical and tedious adjustments that are not normally required once the transceiver has left the factory However if damage occurs and some parts subsequently placed realignment may be required If a sudden problem occurs during normal operation it is likely due to component failure realignment should not be done until after the faulty component has been replaced We recommend that servicing be performed only by authorized SmarTrunk service technicians who are experienced with the circuitry and fully equipped for repair and align Therefore if a fault is suspected contact the dealer from whom the transceiver was purchased for instructions regarding repair Authorized Smartrunk service technicians realign all circuits and make complete performance checks to ST 2112D SM R 1 2 ensure compliance with factory specifications after replacing any faulty components Those who do undertake any of the following alignments are cautioned to proceed at their own risk Problems caused by unauthorized attempts at are not covered by the war
22. d signaling level for narrow band operation Radio will generate a 1000Hz reference tone for alignment proposes As soon the desired value is reached press Finish to store the value on radio memory If you want to retrieve factory default press Factory instead of Start You will be asked to confirm the factory default alignment and then if you confirm it original values from factory will be loaded into current alignment settings 5 5 8 signaling level alignment DTMF signaling generated by ST 2112 must be aligned by selecting alignment option from the alignment menu SMARTRUNK SYSTEMS INC Battery Waming Level Main Clock Adjust ElA Tones Level Discriminator Gain Modulator Gain FDMA Deviation TDMA Deviation Power High Level Power Medium Level Power Low Level S Level CTCSS Level FSK Mod Level Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you check the deviation meter to reach the desired signaling level for narrow band operation Radio will generate 1000Hz alignment reference tone for alignment proposes As soon the desired value is reached press Finish to store the value on radio memory If you want to retrieve factory default press Factory instead of Start You will be asked to confirm the factory default alignment and then if you confirm it original v
23. dio Processor Us which has a built in modem which operates for FDMA or TDMA signals controlling the modulation of the Transmitter U1 through the VC TXCO for DC to low frequencies and the direct modulation for higher frequencies 4 3 3 Drive and Final Amplifier Stages Final RF 15 amplified on 02 25C3356 then filtered to be fed to 2S5K34 75 then finally amplified by 25 3476 up to 5 watts output power The transmit signal then passes through the antenna switch 1 BAR63 and is low pass filtered to suppress harmonic Spurious radiation before delivery to the antenna SMARTRUNK SYSTEMS INC 4 3 4 Automatic Transmit Power Control The RF power detector RB705D detects transmitted feedback then sends the readout to audio processor U5 7141 Audio amplifier compares the transmitted power against the referred level stored on current channel memory adjusting the power control level generated as reference by one DAC output on the same Audio processor U5 then amplified by 2 MCP6241U controlling the gate current on 1 and 17 Evenly when power level is adjusted by software on three levels Hi Med Lo the power value can be adjusted to any desired value between zero and SWatts by the alignment software Notes ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 9 RC 2112 ALIGNMENT 5 1 Introduction The ST 2112 series is carefully aligned in factory for the specified performance a
24. e volume SMARTRUNK SYSTEMS INC and fed it to the audio power 4 3 2 DIGITAL TX AUDIO amplifier U10 The AF signal from the internal AUDIO 4 3 Transmitter System PROCESSOR vc Txco U5 Y1 4 3 1 ANALOG TXSIGNAL MAIN m 01 TRANSMITTER PROCESSOR US 012 01 VC TXCO Y1 The AF signal from the Internal microphone MK1 or external microphone 75 are processed as differential signal then it is conditioned and transformed into common mode by the microphone pre amplifier 012 The result of the conditioned band filtered signal is fed to the Audio Processor U5 which provides audio compander emphasize limitation encryption etc The high audio band of the signal from 300 to 3500 Hz are directly fed to the transmitter 01 which performs a direct modulation of a generated carrier Low frequency signaling audio are fed directly to 1 main clock generator and Ul with a corresponding balance controlled by software ST 2112D SM R 1 2 microphone MK1 external microphone 5 are fed directly to the vocoder chip U6 which perform the data codification delivering the digitized and encoded audio as digital frames which are processed by the Main Processor U8 which add a FEC Frame Error Correction encrypt the information and add the user related information as user ID etc The final data frame is fed to the Au
25. ed on alignment slider Press Start then move the slider to reach the desired value at the time you check the deviation meter to reach the desired signaling level for narrow band operation Radio will generate 123 0Hz audio tone for alignment proposes As soon the desired value is reached press Finish to store the value on radio memory If you want to retrieve factory default press Factory instead of Start You will be asked to confirm the factory default alignment and then if you confirm it original values from factory will be loaded into current alignment settings 5 5 11 FSK signaling alignment align FSK PSK signaling deviation select on Alignment screen ST 2112D SM R 1 2 DZ MAR Battery Waming Level Main Clock Adjust ElA Tones Level Discriminator Gain FSK Mod Level Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you check the deviation meter to reach the desired signaling level for narrow band operation Radio will generate 1000Hz alignment reference tone for alignment proposes As soon the desired value is reached press Finish to store the value on radio memory If you want to retrieve factory default press Factory instead of Start You will be asked to confirm the factory default alignment and then if you confirm it original values from factory will be
26. evel 5 Level CTCSS Level 5 5 2 3 LOW POWER LEVEL ALIGNMENT Repeat the same procedure to align Power but select Sap on the alignment menu Max Deviation Battery Waming Level Main Clock Adjust EIA Tones Level Discriminator Gain Modulator Gain FDMA Deviation TDMA Deviation DTMF Level Power High Level Power Medium Level A DCS Level CTCSS Level 5 5 3 ANALOG MAXIMUM DEVIATION Maximum deviation for analog signals modulated from ST 2112 can be aligned by ST 2112DSMR1 2 Max Deviation Low Tones qo Frecuency 456 00000 alignment option from the alignment menu Battery Waming Level i DCS Level CTCSS Level Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you checks the deviation meter to reach the desired signaling level for narrow band operation Radio will generate a 1000Hz alignment reference tone for alignment proposes As soon the desired value is reached press Finish to store the value on radio memory Wide band channels uses the same limiter No additional wide band max deviation alignment is required If you want to retrieve factory default press Factory instead of Start You will be asked to confirm the factory default alignment and then if you confirm it original values from factor
27. g Gain at 6 4dB and check AGC as bellow ST 2112D SM R 1 2 Options 4 Minium Volumen Level 0 255 Squelch Level 3 gt 100098 gt Ex PTT Mic Gain 00 088 gt Disable RF Powerffor Lab demo Press to store it in the file The value will be updated after the file is transferred to the radio 7 1 4 DIGITAL AGC ST 2112 has an Automated Gain Control for digital microphone This function adjusts the gain to reach a dynamic gain value which makes the voice to be equivalent to the right voice digitally played back in the other end produced by 50mV RMS on the microphone output and the selected target gain If you want to use AGC then you must select the target equivalent gain on the Mic Gain then check the Digital ACG Check Box For example if you want a dynamic gain which causes the same effect that a gain of 15 0dB when the voice on the microphone causes o0mV RMS in the microphone output standard voice at 4 inches away from the microphone or 6 0dB gain the external microphone connection then you must program the Digital Gain at 15 0dB and the external gain on 6 0dB then check Digital AGC as bellow SMARTRUNK SYSTEMS INC Minium Volumen Level 0 255 Squelch Level Bt PTT Gain Disable RF Powerfor Lab demo Press to store it in the file The value will be updated after the file is transferred to the radio 7
28. loaded into current alignment settings SMARTRUNK SYSTEMS INC 5 6 RECEIVER ALIGNMENT Setup the test equipment as shown for Receiver alignment apply 7 5 V DC power to the transceiver The RF frequency must be loaded on Receiver Frequency of the alignment software to facilitate the alignment within all radio band avoiding special programming of the radio before start alignment procedure signal generator 7 5V Power Supply PC compatible RECEIVER ALIGNMENT SETUP 9 6 1 DISCRIMINATOR GAIN This is a critical parameter which may not be realigned to different values other than factory default Under your risk if you still prefer to realign the overall modulation gain you must 501001 Gail on Alignment screen 51 21120 SM 1 2 Max Deviation Battery Waming Level Main Clock Adjust ElA Tones Level Frecuency Modulator Gain FDMA Deviation Deviation DTMF Level Power High Level Start Power Medium Level Power Low Level DCS Lev CTCSS Level Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value As soon the desired value is reached press Finish to store the value on radio memory Default value is you want to retrieve factory default press Factory instead of Start You
29. ncryption is used we recommend keeping it as low as possible Press OK to store it in the file The value will be updated after the file is transferred to the radio 7 1 2 ANALOG External Mic Gain It aligns microphone sensitivity ESSEN CJ Toe qm m Minium Volumen Level 0 255 20 AGC Mic Gain Be PTT Gain Digital AGC Mic Gain Bd Mic Gain 7 Disable RF Powerfor Lab demo conce Alignment step is 3 2dB SMARTRUNK SYSTEMS INC For noisy environments or when voice encryption is used we recommend keeping it as low as possible Press to store it in the file The value will be updated after the file is transferred to the radio 7 1 3 ANALOG AGC ST 2112 has an Automated Gain Control for analog microphone This function adjusts the gain to reach a dynamic gain value which makes the analog voice deviation be equivalent to the right deviation produced by 50mV RMS on the microphone output and the selected target gain If you want to use AGC then you must select the target equivalent gain on the Mic Gain then check the ACG Check Box For example if you want a dynamic gain which causes the same effect that a gain of 6 4dB when the voice on the microphone causes 50mV RMS in the microphone output standard voice at 4 inches away from the microphone OdB gain on the external microphone connection then you must program the Analo
30. nes Level Discriminator Gain Modulator Gain Deviation E TDMA Deviation Level Power High Level Power Medium Level Power Low Level V CTCSS Level Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you check the deviation meter to reach the desired signaling level for narrow band operation Radio will generate a 1000Hz reference tone for alignment proposes As soon the desired value is reached press Finish to store the value on radio memory you want to retrieve factory default press Factory instead of Start You will be asked to confirm the factory default alignment and then if you confirm it original values from factory will be loaded into current alignment settings 5 5 7 EIA tones Level Alignment EIA signaling generated by 51 2112 must be aligned by selecting alignment option from the alignment menu ST 2112D SM R 1 2 T e Battery Waming Level Main Clock Adjust ElA Tones Level Discriminator Gain Frecuency Modulator Gain FDMA Deviation TDMA Deviation DTMF Level Power High Level Power Medium Level Power Low Level DCS Level CTCSS Level FSK Mod Level Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you check the deviation meter to reach the desire
31. nly by software overriding the information received from the DAC 05 4 2 5 Sub audio signaling Received sub audio signaling like CTCSS and DCS are received and processed by the receiver Ul then detected on the audio processor 05 Once decoded the sub audio signaling is reported to the processor where the firmware compares it with the value programmed into the current channel programming If the received signaling matches the channel programming then the main processor U8 requests the ST 2112D SM R 1 2 audio processor 05 to open the audio patch 4 2 6 ANALOG AUDIBLE SIGNALING DTMF signals MDC1200 and tone signals are processed and decoded by the audio processor 05 Decoded information or received tone is reported to the main processor U8 4 2 7 DIGITAL AUDIO PROCESSING Digital received information is processed by the receiver DSP U1 AUDIO RECEIVER PROCESSOR PROCESSOR U8 VOCODER AMPLIFIER U6 U10 then delivered to the audio processor 05 which includes a high speed 4FSK modem Data decoded by the modem is transferred to the main processor US which de encrypts the information checks the integrity corrects the wrong bits and extract the audio information form the received frame The portion of the data received error free is moved to the vocoder U6 The vocoder re builds the audio from the compressed data then applies filter it adjust th
32. nt the radio plays a concerning message back any time the GPS changes the status Powered on Powered Off Fix etc only on those versions which includes GPS Check RSSI if you want the radio plays a concerning message back any time you ask for current RSSI Press OK once you finish the setting of all desired messages This feature will be stored into the file then it will be transferred to the radio at the time the file is uploaded to the radio ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC This page left blank intentionally ST 2112D SM R 1 2 SMARTRUNK SYSTEMS INC 9 ST 2112 SCHEMATIC PAENA _ 10 11 cal C63 1 1 1 oone 100 Fo ET LAN C81 T RADIO CLOCK MOD2 3VD UZ CSRAM MISO 5 C66 C257 22uF 10uF 22uF C86 E Tour 110 C111 12 113 C114 der der der der ar R93 SMTK 125 126 0808 ke door VBUS 9 123 124 15nH 1nF 15nH 50 7pF 1 7pF Ne 4 TLED SCK R NOORWNM USB MISO MOSI SPEECH _____ ACCESORY 3VA C141 166 _ hoone hour 167 168 10 12 PWR TUNE 2 206 bus R16 R17 470 47 0 15nH 33
33. o the radio as recommended on TX alignment diagram As soon as Start is pressed the radio start to transmit a carrier so please verify the antenna dummy load is properly connected to avoid any damage to the transmitter As soon the desired value is reached press Finish to store the value into radio memory If you want to load default High power only keeping any other value without any change press Factory instead of Start A pop up window will ask you to confirm the default parameters upload to the radio power Press to confirm As descripted previously you can manually select the frequency range to align divided into five different sub ranges low You also define the right frequency of interest to align typing the desired one into the frequency field Frecuency 136 00000 If selected frequency is not supported by radio hardware the frequency field will be filled on red In case the PLL is locked then it becomes filled on green Please be sure that the PLL is locked as soon as you press Start SMARTRUNK SYSTEMS INC otherwise the alignment should be not correct 9 9 2 2 Mid POWER LEVEL ALIGNMENT Repeat the same procedure to align Power but select on the alignment menu Discriminator Gain Modulator Gain FDMA Deviation TDMA Deviation Power High Level Power Medium Level Sat Power Low L
34. pen 1 07 1 1 C176 100 8106 AUDIO V oae ANN 3 C17 120K C178 OUTPL Wiz J VV vzak 1 220K 2 2uF hoopr 109 1 1 Lout 220K SPEAKER HEADER 1 HEADER 1 MICROPHONE 3VA EXT PTT R15 1K R138 1 100 na R118 8112 GPSRX R113 1988 __ E 470 R133 10 C217 1 230 2 cies R116 1nF C183 7 206 4 7 3 1 6 w ie me Eo C221 MCP6241U 06 E 3 E E E E i EXP 47 4 7uF R121 MEN 198 DTC114EM 47K R9 Q5 C223 0224 2 R139 1K C226 1nF 1 gt 100K T 118 LCB1608 600 R104 05 s 0 2 RR264M MAIC 17 Date Friday Jul 11 2014 itle RC 2112 R1 4 REF LAYOUT 1 4 ize Document Number Rev D DM 0911 15 F Sheet 1 of 1 10 ST 2112 FROM BOARD SCHEMATIC E 5 3VD 3VA 7V 4 27 26 25 24 23 22 21 20 19 SCL SDA FNC CSD pa 00 a D1 ACCESY PORT POWER SUPPLY R2 zz 2 A ZN 22 55 555 65 D2 A pap AAA GPSRX ma lt lt lt lt lt lt D3 94 06 1 07 2 5 3 4 5 CSA 6 7 T 8 916 R1 CON8 1K z L1 MAAMA lt ANT
35. ranty policy Also SmarTrunk reserves the right to change circuits and alignment procedures in the interest of improved performance without notifying owners Under no circumstances should any alignment be attempted unless the normal function and operation of the transceiver are clearly understood the cause of the malfunction has been clearly pinpointed and any faulty components replaced and realignment determined to be absolutely necessary 5 2 ALIGNMENT The following test equipment and thorough familiarity with its correct use is necessary for complete realignment Correction of problems caused by misalignment resulting from use of improper test equipment is not covered under the warranty policy While most steps do not require all of the equipment listed the interactions of some adjustments may require that more complex adjustments be performed afterwards Do not attempt to perform only a single step unless it is clearly isolated electrically from SMARTRUNK SYSTEMS INC all other steps Have all test equipment ready before beginning and follow all of the steps in a section in the order presented Required Test Equipment v RF Signal Generator with calibrated output level at 1 GHz v Deviation Meter detector In line Wattmeter with 5 accuracy at 1 GHz v 50 Ohm RF Dummy Load with power rating 10W at 1 GHz v 8 Ohm AF Dummy Load Attention Audio output is BTL output Regulated DC Po
36. sor 08 04 SERIAL PORT Notes 4 ST 2112 RF DESCRIPTION 4 1 Circuit Configuration The receiver is a single receiver with built in DSP fully integrated Incoming signals from the antenna after passing through LPF filter are fed direct to the DSP down converter to get the baseband voice from OHz to 3500Hz Demodulated signals are filtered and conditioned onto a second DSP based filter which also includes a high efficiency 4FSK modem For digital demodulation the recovered data is fed into a vocoder which converts the data to voice Analog voice from the analog path or the analog voice recovered from the vocoder are fed into an audio power amplifier Transmit signal frequency is generated by integrated VCO and PLL RF frequency generated by the integrated RF chip is amplified into a 3 step amplifier then filtered by a low pass filter to be applied to the antenna 4 2 Receiver System 4 2 1 Front end RF Receiver Incoming RF signals from the antenna are delivered to the Receiver Unit and pass through a Low pass filter antenna switching ST 2112D SM 1 2 PROTECTION RECEIVER FILTER U1 SWITCH diode and then fed to the receiver U1 passing through a limiter BPF 4 2 2 ANALOG Audio Processing AUDIO RECEIVER PROCESSOR AMPLIFIER U1 s U10 The RF signal is tuned by U1 which includes a base band DSP audio processing recovering fla
37. t audio from DC up to 3500 hz The detected audio is amplified fillered and conditioned inside of U5 which also includes a de emphasize filtering shape for received audio signals The output of the filtered and conditioned audio is delivered to an audio power amplifier U10 then to the speaker passing through the external audio connector switch 4 2 3 Virtual Squelch Circuit S N ratio is measured by the receiver U1 as the result of the analysis of the signal and the noise of the carrier The output is sent to the main processor as a digital frame which is analyzed by radio firmware removing noise then qualifying the signal level If the signal level is higher than the SMARTRUNK SYSTEMS INC for the current programmed squelch threshold then the processor analyzes the expected signaling programmed on the current channel table In case of not any signaling is required or the signal has been detected the processor ask to the audio processor U5 to open the audio path unmuting the audio amplifier 010 4 2 4 Virtual VOLUME CONTROL The potentiometer position RV1 is measured by one analog to digital converter on the audio processor 05 and then the information 15 reported to the main processor The firmware immediately adjusts the audio processor path gain to get the appropriate overall circuitry volume control Minimum volume emergency and private audio level are controlled o
38. u will be asked to confirm the factory default alignment and then if you confirm it original values from factory will be loaded into current alignment settings SMARTRUNK SYSTEMS INC 7 USER ALIGNMENT The above parameters only be aligned under dealer login and most of them should be critical for proper radio performance Additional complimentary parameters should be also aligned on user login mode it means the user can align it as per the most convenient way for particular radio usage 7 1 OPTION ALIGNMENT To access to the option alignment menu select Edit then Option form the main software toolbar 5 TX RX Sub Doma Passwords TX Sub Digital Profiles Accessory Port Model 512112 VHF FW Version Last Pro As soon as you click on Options the Options screen is popped up Analog Minium Volumen Level 0 255 20 AGC 25 Squelch Level y Mo Gan Bd PTT Mic Gain Disable RF Powerfor Lab demo o _ cance Backup ST 2112D SM R 1 2 From this screen the user can adjust 7 1 1 ANALOG Microphone gain It aligns microphone sensitivity Analog AGC Gain Ed PTT Mic Gain Digital v AGC Gain Ed PTT Mic Gain 7 Disable RF Powerfor Lab demo Alignment step is 3 2dB For noisy environments or when voice e
39. wer Supply standard 7 5 DC linear v Frequency Counter with 0 2 ppm accuracy at 2 v Audio Generator Voltmeter v DC Voltmeter v Sampling Coupler v IBM compatible Computer with Microsoft Windows XP or later operating system v SmarTrunk SDR Programming software version 1 0 2 or later v USBA B Programming Cable 9 3 Alignment Procedure Alignment Precautions Preparation amp A 50 Ohm RF Dummy Load and in line wattmeter must be connected to the main antenna jack in all procedures that request for ST 2112D SM R 1 2 transmission except where specified otherwise Correct alignment is not possible with antenna After completing one step read the following steps to determine whether the same test equipment will be required If not remove the test equipment except dummy load and wattmeter if connected before proceeding Correct alignment requires that the ambient temperature be the same as that of the transceiver and test equipment and that this temperature be held constant between 68 F and 86 F 20 C 30 When the transceiver is brought into the shop from hot or cold air it should be required to wait few minutes to come to room temperature before alignment Whenever possible alignments should be made with oscillator shields and circuit boards firmly affixed in place Also the test equipment must be thoroughly warmed up before beginning
40. will be asked to confirm the factory default alignment and then if you confirm it original values from factory will be loaded into current alignment settings SMARTRUNK SYSTEMS INC 6 COMPLEMENTARY RADIO ALIGNMENT 6 1 BATTERY WARNING LEVEL ST 2112 generates acoustic and visual alerts when battery has reached a low voltage Visual information is displayed on battery icon which flashes with a cross on it when the minimum hardware value is reached Acoustic signaling is generated by the radio when the battery warning voltage is reached and this value can be adjusted by the dealer To align batte warning levels select 0 or Alignment screen Max Deviation Main Clock Adjust EIA Tones Level Discriminator Gain Modulator Gain FDMA Deviation TDMA Deviation DTMF Level Power High Level Power Medium Level Power Low Level DCS Level CTCSS Level Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value This value means the percentage of charge when the radio starts the warning signals to the user visual and acoustic As soon the desired value 15 reached press Finish to store the value on radio memory ST 2112D SM R 1 2 Default value is 10 which correspond to 10 of residual charge to start the warning process you want to retrieve factory default press Factory instead of Start Yo
41. y back a tone to acknowledge any time any keyboard key is pressed Check Pre TOT if you want to play back a tone to allert when time out ST 2112D SM R 1 2 timer 15 close to expire 5 seconds ahead Check Rotary if you want to play back a tone to acknowledges any time the rotary switch changes its position 8 3 ANNUNCIATION Third folder on appearance screen allows the user to define if the radio will play back any annunciation message for some important events as per the associated check box Voice and language of the annunciation events can be adjusted as per user request Please refer to appendix to learn about it i Apparence Tones Bank Channel Squelch mode Squelch level Battery level Power GPS 551 Check Bank if you want the radio plays a concerning message back any time current bank has been changed Check Channel if you want the radio plays a concerning message back any time current channel has been changed Check Squelch mode if you want the radio plays a concerning SMARTRUNK SYSTEMS INC message back any time squelch function is changed Check Battery level if you want the radio plays a concerning message back any time battery level is below the value programmed as Battery Warning Level on alignment screen Check Power if you want the radio plays a concerning message back any time power level high med low or auto has been changed Check GPS if you wa
42. y will be loaded into current alignment settings 5 2 4 Modulation Gain alignment This is a critical parameter which may not be realigned to different values other than factory default SMARTRUNK SYSTEMS INC Lower means very high microphone gain must be assigned to get the proper radio voice deviation and higher gain means a risk because the max deviation limit must be reached by any signal which makes the limiter to introduce distortion to avoid over deviation Under your risk if you still prefer to realign the overall modulation gain you must select Modulator Gain on Alignment screen PZ 3 7 Max Deviation Battery Waming Level Main Clock Adjust EIA Tones Level Discriminator Gain Modulator Gain FDMA Deviation E TDMA Deviation DTMF Level Power High Level Power Medium Level Power Low Level DCS Level CTCSS Level Actual alignment value will be displayed on alignment slider Press Start then move the slider to reach the desired value at the time you checks the deviation meter to reach the desired signaling level for narrow band operation For this alignment step the radio does not generate any signal It only stores the new value of the overall modulation gain into the memory As soon the desired value is reached press Finish to store the value on radio memory If you want to retrieve factory default press Factory instead of Start You will be asked to

ST-2112D Service Manual - SmarTrunk Systems, Inc.

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