MMASD225U1UHF DATA RADIO

User Guide Contents Introduction 2 Preparing for use 2 Unpacking and inspection 3 Description of modem 3 External Connections 3 Pin Outs 4 Channel Selection 5 Operation Transmit/Receive Operation Serial Commands Status Indicators Programming 5 Installation 5 Antennas 5 Power sources 6 Cabling 7 Fixing 7 Safety and general information 10 Warranty and repairs 12 Care of the equipment 12 Disposal / Recycling 12 Introduction The SD225 range is a 1 to 5 Watt PMR data modem at VHF and UHF frequencies The SD225 is housed in a rugged cast-aluminium box sealed to IEC 529 (IP54) making it suitable for a wide range of mobile and fixed applications. All SD225 modem units meet the essential requirements of the relevant directives. In order to maintain this compliance the installation and safety information must be adhered to at all times. • The SD225 modem must only be installed where unintentional contact cannot be made. The surface of the device may be hot to touch under certain transmit conditions. The SD225 is not designed for permanent transmission. If prolonged transmission periods are used, the unit will become hot and will require an additional heatsink to be fitted. • When fitting the modem into a fixed installation, care must be taken in the routing of all cabling such that the insulation cannot become damaged. • The recommended supply sources for use with the SD225 are a standard 12V / 2A dc supply, but is capable of operating in the range 9V - 18V. Preparing for use Unpacking and inspection Unpack the modem and check that you have received the following items: • SD225 modem • User Guide (this document) If any of these items are missing, please contact your supplier. Description of modem The SD225 is a network free, point to point data radio that offers great flexibility in varied applications where wireless data or voice communication is needed. It can be used as a transparent radio, with no internal modem fitted, to allow users to facilitate the use of their own modem and protocol. The correct signal levels need to be used with the use of separate control lines, see the pin out table below. The SD225 can also be fitted with a Bell 202/V23 modem (1200 baud rate). The internal modem allows communication with a pc using RS 232 for the data and control lines. For further details, please refer to the modem manual. SD225 has standard radio features available which are associated with a private radio. This includes CTCSS and DCS, software controlled squelch, time out timer options and busy channel lockout as listed below (not all available with option modem fitted). There is a microphone input and speaker output to allow speech to be transmitted and received. Features • Compact and rugged die cast box • Resistant to dirt, dust and water ingress (IP54 rated) • Network free, point to point communication • 1/5 watt programmable output power • Synthesised operation with 16 channel capability • SAT when used with Bell 202/V23 modem or speech • Programmable 12.5 / 25kHz channel spacing • External modem / Direct FM • Internal modem options available: Bell 202/V23 • ‘Busy’ output (can be set active high or low) • 9 – 18 volt supply input • Busy Channel lockout • Time out timer External Connections 1. HD 9-way d-type (data, control signals and power supply) 2. BNC antenna connector PIN Outs DB-9 PIN OUT table with input and output levels Pin No. Function Description Signal Type I/O 1 link option Data modulation IN (used with an ext. modem) A/c coupled signal directly injected to MOD through data low pass filter without pre-emphasis. Link 409 fitted. Link 412 not fitted Analogue signal 1KHz audio at 60% peak dev. input level =100 to 120mVrms I/P 1 link option RS 232 data IN Input to Bell 202/V23 modem Link 409 not fitted and link412 fitted RS232 level I/P 2 link option Data unfiltered OUT (RX disc) Discriminator audio from the D-200. Unprocessed AF signal (prior to tone filtering and de-emphasis) Link 413 fitted and link 414 not fitted. Analogue signal 1KHz audio at 60% peak dev. produces 200 to 300mVrms O/P 2 link option RS 232 Data OUT Output from Bell 202/V23 modem Link 413 not fitted and link 414 fitted RS 232 levels O/P 3 PTT In (Tx Key) / Program: READ Signal, which keys the transmitter. Is an active low signal with an internal pull up resistor. If required can be converted to active high using link options. Note: If the option modem board is installed, a jumper board can select RS-232 signal levels. See Modem manual Program : READ used for outputting programming data from mode TTL level 0V = Tx open cct = Rx RS-232 level (option) +12V = Tx -12V = Rx TTL level (RS 232 converter in cable I/P 4 Ground Ground connection to chassis of the radio. 0V (Chassis) 5 +Ve Power connection: +12 Volts nominal 9v-18v extreme 1/P 6 Busy (CD) Logic level output to indicate presence of a carrier. (If required, link changes enable the busy line to be active high) Note: If the option modem board is installed, a jumper board can select RS-232 signal levels. See Modem manual TTL level 0V = carrier 5V = no carrier RS-232 level (option) +12V = carrier -12V = no carrier O/P 7 MIC IN / Audio signal that is filtered (high pass and pre- emph) then follows same route as data mod through LPF. Sub-audio tone is mixed with audio after the LPF. 1KHz audio at 60% peak system deviation input level = 6 to 8Vrms I/P 8 Program : WRITE/ Serial command Used for inputting programming data and use of serial command TTL level (RS232 converter in cable) I/P 9 SPEAKER OUT Audio output from the audio amplifier. Filtered by tone-filter and de-emphasis circuit. 1KHz audio at 60% peak dev. produces nominal 1Vrms @ 8Ω O/P Operation Channel Selection Channels are selected by the use of internal switches and can be set as shown below. The top 4 screws will need to be removed to gain access to the switches, care must be taken to avoid any damage which could invalidate the warranty. The channel can also be changed by a serial command inputted from the…

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User’s Guide SD-225 Series 16 Channel UHF/VHF Data Radio www.midlandradio.com SD-225 User’s Guide 2 © 2006, Midland Radio Corporation FCC RF EXPOSURE COMPLIANCE REQUIREMENTS FOR OCCUPATIONAL USE ONLY The Federal Communications Commission (FCC), within its action in General Docket 93-62, November 7, 1997, has adopted a safety standard for human exposure to Radio Frequency (RF) electromagnetic energy emitted by FCC regulated equipment. Midland Radio Corporation subscribes to the same safety standard for the use of its products. Proper operation of this radio will result in user exposure far below the Occupational Safety and Health Act (OSHA) and FCC limits.  This radio is NOT approved for use by the general population in an uncontrolled environment. This radio is restricted to occupational use, work related operations only, where the radio operator must have the knowledge to control the user’s exposure conditions for satisfying the higher exposure limit allowed for occupational use.  DO NOT transmit for more than 50% of total use time (50% duty cycle). Transmitting more than 50% of the time can cause FCC RF exposure compliance requirements to be exceeded.  The antenna used with this radio should not have gain of more than 6 dBi. Make sure no one is closer than 20 inches to the antenna when transmitting. The radio is transmitting when the red LED on the cover of the radio is illuminated. You can cause the radio to transmit by grounding pin 3 on the radio connector. ! These are required operating conditions for meeting FCC RF exposure compliance. Failure to observe these restrictions means violation. SD-225 User’s Guide © 2006, Midland Radio Corporation 3 Contents Conventions and Symbols in this Book ................................... 4 Disclaimer ................................................................................ 4 Safety ....................................................................................... 4 Introduction .............................................................................. 6 Radio Models ....................................................................... 6 Radio Features..................................................................... 6 Recommended Accessories and Options ............................ 7 Radio Connections................................................................... 8 Connection Overview ........................................................... 8 External Interface ............................................................... 10 DB9 Radio Interface Connector Details ............................. 10 Setup and Operation.............................................................. 12 Mounting............................................................................. 12 Channel Selection .............................................................. 12 Status LED ......................................................................... 13 Specifications ......................................................................... 14 Warranty Statement............................................................... 15 SD-225 User’s Guide 4 © 2006, Midland Radio Corporation Conventions and Symbols in this Book  This symbol marks a “caution”. Cautions are special notices which you should read and follow carefully to avoid possible damage to your equipment and to avoid potential danger to yourself or other people. ! This symbol marks an “important point”. Important points are specific instructions which should be followed closely for proper operation.  This symbol marks a “note”. Notes are hints or tips which offer additional information to help you. Disclaimer Midland Radio Corporation is committed to continuous quality improvements, for this reason specifications may change without prior notice. Every effort has been made to ensure that the information in this document is complete, accurate, and up-to-date. Midland assumes no responsibility for the results of errors beyond its control. The manufacturer of this equipment also cannot guarantee that changes in the equipment made by unauthorized people will not affect the transceiver’s performance or functions. Safety Your SD-225 data radio has been carefully designed to give you years of safe, reliable performance. As with all electrical equipment, however, there are a few basic precautions you should take to avoid injury to yourself or damage to the radio:  Read the instructions in this book carefully. Be sure to save it for future reference.  Read and follow all warning and instruction labels on the radio itself.  Do not operate the radio near unshielded electrical blasting caps or in an explosive atmosphere. SD-225 User’s Guide © 2006, Midland Radio Corporation 5  Do not operate the transmitter of any radio unless all RF connectors are secure.  All equipment must be properly grounded for safe operation.  Do not allow children to operate or play with or near the radio equipment.  Never attempt to service the radio yourself. All equipment should be serviced by a qualified technician. Contact you local dealer or communications coordinator for assistance.  Do not allow the antenna to touch or come in very close proximity with the eyes, face, or any exposed body parts while the radio is transmitting.  The above warning list is not intended to include all hazards that may be encountered when using this radio. SD-225 User’s Guide 6 © 2006, Midland Radio Corporation Introduction Congratulations! By choosing the Midland SD-225 data radio, you have selected a flexible, easily configured communication device. Its rugged design will provide years of reliable service and exceptional performance. Radio Models The SD-225 data radio is available in three frequency ranges. SD-225V2: 5 W, VHF high band, 148-174 MHz SD-225U1: 5 W, UHF high band, 400-440 MHz SD-225U2: 5 W, UHF high band, 440-480 MHz Radio Features The SD-225 series data radio is a programmable, synthesized 16 chann…

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5900 Parretta Drive ● KANSAS CITY, MISSOURI ● 64120 TELEPHONE: (816) 241-8500 ● FAX: (816) 241-5713 EMAIL: [email protected] WEBSITE: www.midlandradio.com Midland Radio Corporation 5900 Parretta Drive, Kansas City, MO. 64120 Phone: (816) 241-8500 Fax: (816) 241-5713 Website: wwwl.midlandradio.com E-Mail: [email protected] August 14, 2007 Equipment Authorization Division Office of Engineering and Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Ref: FCC ID: MMASD225U1 Request for Confidentiality Dear Sirs: With regard to the referenced application, Midland Radio Corporation is requesting confidentiality of certain sections of the accompanying documents. The documents for which Midland Radio Corporation is requesting confidentiality are: Schematic Diagrams (2818UT7 Schematic DG.pdf, 2818UT7 Schematic RF.pdf) Block Diagram (2818UT7 Blockdiagram.pdf) Operational Descriptions (2818UT7 OperationalDesc.pdf) This request is made under the provisions of Section 0.457(d) of the Commission’s Rules, and Section 552(b)(4) of the Freedom of Information Act. The material for which confidentiality is requested falls within the scope of Section 552(b)(4) as trade secrets and includes material covered by Section 0.459 of the Commission’s Rules. Sincerely, Thomas L. Bishop, engineer

APPLICANT: MIDLAND RADIO CORP. FCC ID: MMASD225U1 EXTERNAL PHOTOS

APPLICANT: MIDLAND RADIO CORP. FCC ID: MMASD225U1 INTERNAL PHOTOS TOP REMOVED RF SHIELD REMOVED DIGITAL BOARD REMOVED DIGITAL PCB TOP DIGITAL PCB BOTTOM RF PCB TOP RF PCB BOTTOM

Item Part No. Value Part Name Qty Reference Manufacturer Supplier 1 UG-1094/U(F) BNC CONNECTOR 1 SAMWOO 21 AIM TECHNOLOGY 31 AIM TECHNOLOGY 41 AIM TECHNOLOGY 51 AIM TECHNOLOGY 61 AIM TECHNOLOGY 71 AIM TECHNOLOGY 81 AIM TECHNOLOGY 91 AIM TECHNOLOGY 104 AIM TECHNOLOGY 112 AIM TECHNOLOGY 121 AIM TECHNOLOGY Item Part No. Value Part Name Qty Reference Manufacturer Supplier 1 RC1005J000CS 0 Chip resistor - 0402 (LINK) 7 LK1 LK4 LK6 LK8-9 LK12 C62 SAMSUNG 2 RC1005J000CS 0 Chip resistor - 0402 1 R105 SAMSUNG 3 RC1005J100CS 10 Chip resistor - 0402 1 R53 SAMSUNG 4 RC1005J180CS 18 Chip resistor - 0402 3 R13 R33 R(C62) SAMSUNG 5 RC1005J330CS 33 Chip resistor - 0402 1 R98 SAMSUNG 6 RC1005J390CS 39 Chip resistor - 0402 1 R62 SAMSUNG 7 RC1005J470CS 47 Chip resistor - 0402 2 R17 R64 SAMSUNG 8 RC1005J510CS 51 Chip resistor - 0402 3 R5-6 R68 SAMSUNG 9 RC1005J101CS 100 Chip resistor - 0402 9 R1-2 R12 R14 R38 R49 R70 R88 R120 SAMSUNG 10 RC1005J121CS 120 Chip resistor - 0402 1 R39 SAMSUNG 11 RC1005J221CS 220 Chip resistor - 0402 2 R31 R56 SAMSUNG 12 RC1005J301CS 300 Chip resistor - 0402 4 R34 R32 R66-67 SAMSUNG 13 RC1005J471CS 470 Chip resistor - 0402 1 R22 SAMSUNG 14 RC1005J681CS 680 Chip resistor - 0402 1 R55 SAMSUNG 15 RC1005J102CS 1K Chip resistor - 0402 4 R47 R69 R85 R87 SAMSUNG 16 RC1005J122CS 1.2K Chip resistor - 0402 1 R28 SAMSUNG 17 RC1005J152CS 1.5K Chip resistor - 0402 1 R48 SAMSUNG 18 RC1005J182CS 1.8K Chip resistor - 0402 1 R73 SAMSUNG 19 RC1005J222CS 2.2K Chip resistor - 0402 3 R54 R72 R104 SAMSUNG 20 RC1005J272CS 2.7K Chip resistor - 0402 2 R10-11 SAMSUNG 21 RC1005J332CS 3.3K Chip resistor - 0402 1 R50 SAMSUNG 22 RC1005J392CS 3.9K Chip resistor - 0402 1 R101 SAMSUNG 23 RC1005J472CS 4.7K Chip resistor - 0402 3 R90 R95 R30 SAMSUNG 24 RC1005J562CS 5.6K Chip resistor - 0402 3 R9 R29 R96 SAMSUNG 25 RC1005J682CS 6.8K Chip resistor - 0402 1 R36 SAMSUNG 26 RC1005J103CS 10K Chip resistor - 0402 12 R16 R20 R24 R26 R46 R82 R7 R107 SAMSUNG R109-111 R8 27 RC1005J123CS 12K Chip resistor - 0402 2 R35 R52 SAMSUNG 28 RC1005J153CS 15K Chip resistor - 0402 1 R100 SAMSUNG 29 RC1005J203CS 20K Chip resistor - 0402 4 R102-103 R23 R108 SAMSUNG 30 RC1005J333CS 33K Chip resistor - 0402 1 R21 SAMSUNG 31 RC1005J473CS 47K Chip resistor - 0402 2 R15 R91 SAMSUNG 32 RC1005J513CS 51K Chip resistor - 0402 1 R94 SAMSUNG 33 RC1005J104CS 100K Chip resistor - 0402 1 R93 SAMSUNG 34 RC1005J184CS 180K Chip resistor - 0402 1 R92 SAMSUNG 35 RC1005J474CS 470K Chip resistor - 0402 2 R71 R86 SAMSUNG 36 RC1005J684CS 680K Chip resistor - 0402 1 R25 SAMSUNG 37 RC1005J105CS 1M Chip resistor - 0402 2 R51 R106 SAMSUNG 38 RC1005J475CS 4.7M Chip resistor - 0402 1 R57 SAMSUNG 39 RC1608J911CS 910 Chip resistor - 0603 2 R3-4 SAMSUNG 40 RC1608F683CS 68K Chip resistor - 0603 2 R58 R60 SAMSUNG 41 RC1608F104CS 100K Chip resistor - 0603 2 R59 R61 SAMSUNG 42 RC2012J000CS 0 Chip resistor - 0805 2 R42 R(C16) SAMSUNG 43 RC2012J2R2CS 2.2 Chip resistor - 0805 3 R43-45 SAMSUNG 44 RC2012J474CS 470K Chip resistor - 0805 3 R40-41 R65 SAMSUNG 45 0.1 Chip resistor - 1218 1 R63 YAGEO 46 RH03ADC14X 10KB VRES 3 RV1 RV3-4 ALPS 47 RH03ADC15X 100KB VRES 1 RV2 ALPS 48 GRM1555C1H3R0C 3pF Chip ceramic cap. - 0402 2 C21 C24 MURATA 49 GRM1555C1H3R9C 3.9pF Chip ceramic cap. - 0402 1 C33 MURATA 50 GRM1555C1H5R0C 5pF Chip ceramic cap. - 0402 2 C25 C100 MURATA 51 GRM1555C1H6R0D 6pF Chip ceramic cap. - 0402 1 C8 MURATA 52 GRM1555C1H6R8D 6.8pF Chip ceramic cap. - 0402 1 C28 MURATA 53 GRM1555C1H120J 12pF Chip ceramic cap. - 0402 2 C29 C31 MURATA 54 GRM1555C1H150J 15pF Chip ceramic cap. - 0402 1 C77 MURATA 55 GRM1555C1H240J 24pF Chip ceramic cap. - 0402 1 C30 MURATA 56 GRM1555C1H270J 27pF Chip ceramic cap. - 0402 2 C32 C78 MURATA 57 GRM1555C1H300J 30pF Chip ceramic cap. - 0402 1 C70 MURATA 58 GRM1555C1H330J 33pF Chip ceramic cap. - 0402 1 C79 MURATA 59 GRM1555C1H470J 47pF Chip ceramic cap. - 0402 1 C102 MURATA 60 GRM1555C1H820J 82pF Chip ceramic cap. - 0402 2 C64 C73 MURATA 61 GRM1555C1H221J 220pF Chip ceramic cap. - 0402 7 C5 C9 C18 C23 C49 C98 C101 MURATA 62 GRM155R71H471J 470pF Chip ceramic cap. - 0402 25 C42-44 C48 C50 C53 C55-60 C19-20 C7 MURATA C89-90 C92 C99 C13 C112 C26-27 C135 C137 63 GRM155R71H102K 0.001uF Chip ceramic cap. - 0402 9 C71 C75 C15 C81 C108-109 C114 C136 C138 MURATA 64 GRM155R71H472K 0.0047uF Chip ceramic cap. - 0402 2 C94 C93 MURATA 65 GRM155R71E103K 0.01uF Chip ceramic cap. - 0402 8 C80 C84 C86 C45 C11 C103 C117 C69 MURATA 66 GRM155R61A104K 0.1uF Chip ceramic cap. - 0402 17 C14 C46 C10 C72 C74 C76 C85 C87 C95 C97 MURATA C110-111 C116 C118 C131-133 67 0.22uF Chip ceramic cap. - 0402 1 C120 MURATA 68 CL10C110JB8NNNC 11pF Chip ceramic cap. - 0603 1 C66 SAMSUNG 69 CL10C220JB8NNNC 22pF Chip ceramic cap. - 0603 1 C65 SAMSUNG 70 CL21CR75BBAANNC 0.75pF Chip ceramic cap. - 0805 1 C41 SAMSUNG 71 CL21C1R5BBAANNC 1.5pF Chip ceramic cap. - 0805 1 C35 SAMSUNG 72 CL21C3R3CBAANNC 3.3pF Chip ceramic cap. - 0805 1 C36 SAMSUNG 73 CL21C080DBAANNC 8pF Chip ceramic cap. - 0805 1 C39 SAMSUNG 74 CL21C140JBAANNC 14pF Chip ceramic cap. - 0805 1 C37 SAMSUNG 75 CL21C160JBANNNC 16pF Chip ceramic cap. - 0805 2 C38 C61 SAMSUNG 76 CL21C471JBANNNC 470pF Chip ceramic cap. - 0805 2 C40 C34 SAMSUNG 77 CL21B474KOFNNNE 0.47uF Chip ceramic cap. - 0805 1 C54 SAMSUNG HEAT SINK BSP 1.0T NI-PL MAIN SHEILD SPTE 0.3T POWER CAN SPTE 0.3T D-SUB CONN.PACKING(9P) RUBBER SHEET 1.0T D-SUB CONN. POST BSBM NI-PL 4.0 POST PILLER BSBM NI-PL (M3) Bill of the Material for SD225 UHF1 Mechanical ASS'Y UPPER COVER RF CAN SPTE 0.3T VCO-CAN SPTE O.3T DD-CAN SPTE 0.3T BOTTOM COVER RF BOARD ASS'Y 78 CL21B105KOFNNNE 1uF Chip ceramic cap. - 0805 1 C68 SAMSUNG 79 ECHU1H103JX5 0.01uF METAL-POLY CAP 2 C3-4 PANASONIC 80 ECHU1H223JX5 0.022uF METAL-POLY CAP 1 C2 PANASONIC 81 ECPU1C334MA5 0.33uF METAL-POLY CAP 1 C1 PANASONIC 82 TCSVN1D474KAAR 0.47uF/20V Tantalum Capacitor - A type 1 C51 PARTSNIC 83 TCSVN1C105MAAR 1uF/16V Tantalum Capacitor - A type 1 C128 PARTSNIC 84 TCSVS1D225MAAR 2.2uF/20V Tantalum Capacitor - A type 1 C12 PARTSN…

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The SD-225 series UHF/VHF transceivers cover the frequency bands, U1(400-440 MHz) U2(440-480 MHz) and V2(148-174 MHz). They should not require any special alignment, unless repairs are performed on the transceiver portion. Should repairs be necessary, use the “Alignment Points Diagram", in conjunction with the following procedures. An extender board is required in order to separate the digital and RF PCB’s to allow access to the alignment points. RECEIVER RX VCO The RX VCO is pre-tuned at factory and no further adjustment should be required. To identify a defective of RX VCO, check the VCO control voltage as follows. 1. Set the unit to the highest receive frequency, 440MHz(U1), 480MHz(U2) or 174MHz(V2) and check the VCO control voltage is under 10.0 volts. If it’s over 10.0 volts, adjust C308 of RX VCO to obtain 10.0 volts as measured at TP1. 2. Set the unit to the lowest receive frequency, 400MHz(U1), 440MHz(U2) or 148MHz(V2) and check that the VCO voltage is above 1.5 volts. If it’s less than 1.5 volts, adjust C308 to obtain 1.5 volts as measured at TP1. Audio Output Level Adjustment 1. Select a receiver channel that is programmed for standard band (25kHz) operation. 2. Prepare the standard test signal as follows. 3. Set the RF signal generator to the receiver frequency. 4. Set the AF modulation signal to 1 kHz at ±3kHz deviation. 5. Set the RF output level of the RF signal generator to –47dBm (1mV). 6. Apply a standard test signal to the receiver antenna terminals. 7. Adjust RV401 for the specific audio output level (1 Vrms into 8 ohms is default). Level Shifter for Modem Option Board 1. Select a receiver channel which is programmed for standard band (25kHz) operation. 2. Apply a standard test signal for to the antenna terminal of the receiver. 3. Adjust RV403 until the center voltage of the demodulated signal (1KHz sine wave) at TP401 (IC416 pin 8) is 2.5 Vdc. 4. Select a receiver channel which is programmed for narrow band (12.5kHz) operation. 5. Apply a standard narrow band test signal (decrease deviation of AF modulation signal to ±1.5KHz) to the antenna terminal of the receiver. 6. Check the center voltage of the demodulated signal at TP401 (IC416 pin 8) is 2.5 Vdc. If necessary, adjust RV403 until the center voltage is near 2.5 Volts for each bandwidth (25KHz / 12.5KHz). TRANSMITTER Connect the unit to a service monitor with the power meter set to the 10 W scale (or autorange) TCXO Set the radio to a mid-range frequency 420MHz(U1), 460MHz(U2) or 160MHz(V2) MHz, adjust TCXO1 for a reading of ±200Hz of the programmed frequency. TX VCO The TX VCO is pre-tuned at factory and no further adjustment should be required. To identify a defective of TX VCO, check the VCO control voltage as follows. 1. Set the unit to the highest transmit frequency, 440MHz(U1), 480MHz(U2) or 174MHz(V2) and check the VCO control voltage is under 10.0 volts. If it’s over 10.0 volts, adjust C208 of TX VCO to obtain 10.0 volts as measured at TP1. 2. Set the unit to the lowest transmit frequency, 400MHz(U1), 440MHz(U2) or 148MHz(V2) and check that the VCO voltage is above 1.5 volts. If it’s less than 1.5 volts, adjust C208 to obtain 1.5 volts as measured at TP1. CTCSS, DCS & TX Deviation and Balance Adjustment 1. Set the unit to a mid range frequency and a CTCSS of 67Hz. Key the radio and adjust RV402 for desired CTCSS tone deviation. 2. Switch to a channel with the same frequency and CTCSS of 250.3Hz. Key the radio and adjust RV1 to the same CTCSS tone deviation same as step 1. 3. Switch between the 67Hz channel and the 250.3Hz channel and adjust RV1 until the deviation is the same on both channels. It may be necessary to readjust RV402 to achieve the desired deviation. 4. Set the unit to a mid range frequency and apply 100 mVrms of 400 Hz audio to the TX data input (pin 1 on the DB9 connector). 5. Increase the signal level to 20 dB from standard level (1Vrms). 6. Monitor the demodulated signal from service monitor. Adjust RV1 to make the monitored signal a balanced square wave. 7. Reduce modulation signal to the standard level (100mVrms) and adjust RV2 for the standard deviation. APC 1. Set the unit to a mid range frequency high power channel and adjust RV4 for 5W. 2. Set the unit to a mid range frequency low power channel and adjust RV3 for 1W. SQUELCH ADJUSTMENT RSSI squelch adjustment using ACC-2025 & ACC-917 The factory default squelch level for the SD-225 series is approximately: Squelch open (un-mute) at -114 to -113dBm (0.45 - 0.5μV of the RX signal strength) Squelch close (mute) at -117 to -116dBm (0.3 - 0.35μV of the RX signal strength) Changing the default squelch settings requires use of the programming cable, software and a RF signal generator. A radio communications test set is recommended. 1. Connect the ACC-2025 to the PC and SD-225 respectively. 2. Run the ACC-917 software and select squelch mode. 3. Select “Custom Define” from the squelch window of the ACC-917. 4. Adjust the RF signal generator for the desired signal strength to OPEN squelch (the default setting is - 114dBm, or 0.45μV) 5. Press “SET(OPEN)” button, the LED indicator will flash 3 times. 6. Adjust the RF signal generator for the desired signal strength to CLOSE squelch (the default setting is -117dBm, or 0.3μV) 7. Press “SET(CLOSE)” button, the LED indicator will flash 2 times. 8. Press “SAVE” button, the LED indicator will flash once. 9. Squelch level is now set. Test for the desired level by increasing or decreasing the RF signal to the levels set for squelch (LED will be OFF when squelch is closed and ON when squelch is open). NOTE: The squelch closing level should be at least -123.5dBm (0.15μV). The difference of RF signal strength between the un-mute and mute levels should be at least 1 dB for the squelch setting to work properly. If the levels are too close, RSSI through the A/D conversion can not differentiate between the mute and un-mute level properly. As a result, the CD (Carrier Detect) will act intermittent. ALIGNMENT…

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FCC RF Exposure Requirements General information: FCCID: MMASD225U1 Device category: Mobile per Part 2.1091 Environment: Controlled Exposure Mobile devices that operate under Part 90 of this chapter are subject to routine environmental evaluation for RF exposure prior to equipment authorization or use if they operate at frequencies of 1.5 GHz or below and their effective radiated power (ERP) is 1.5 watts or more. However, compliance with the power density limits of 1.1310 is not required. Antenna: This device has provisions for operation in a vehicle, or a fixed location. Although the manufacturer does not specify an antenna. A typical vehicle antenna usually has a gain of less than 6 dBi, a gain of 6 dBi was used in this application. Configuration Antenna p/n Type Max. Gain (dBi) Passenger car Any omni 6 Operating configuration and exposure conditions: The conducted output power is 5 Watts. Typical use qualifies for a maximum duty cycle factor of 25%. This value is an intrinsic characteristic of this transceiver as the power amplifier can not handle a higher duty cycle without permanent damage to the power amplifier semiconductor. The manufacturer also markets this device only for occupational use. - Part 2.1091 states that devices are excluded from routine evaluation if the EIRP is less than 2.46Watt (or 1.5WERP). - Vehicle Operation: A typical vehicle installation consists of an antenna system with a coaxial cable of the type RG 58 which has a loss of 1dB for a length of 15 feet. MPE Calculation: The minimum separation distance is calculated as follows: The limit for general /uncontrolled exposure environment above 300 MHz is f/1500 mW/cm 2 . 9/13/2007 Page 1 of 3 FCCID: MMASD225U2 Channel frequency: 406.1-440 MHz The conducted power output is 5 watt. The coax loss was taken as 1 dB. Antenna gain was taken as 6 dBi 25% talk time in 30 minutes Coax LossFor all UHF frequencies dBd3.85:=CL1:=dB GdBd2.15+CL−:= f406.1:= G5= Net gain in dBi Gn10 G 10 :=S f 1500 := mW cm 2 from OET 6 5 Gn3.162= Gain Numeric R W1expGn⋅() 4π⋅S⋅ () := Rinches R 2.54 := R34.086= distance in centimeters Rinches13.42= required for compliance Power in WattsDuty Factor in decimal % (1=100%) W5:=D1:= for an FM device D=1 Exposure time in minutes U30:= (use 6 for controlled and 30 for uncontrolled) E7.5:= PC E U := percent on time WexpWD⋅ E U ⎛ ⎜ ⎝ ⎞ ⎠ ⋅:= PC0.25= Time compensated power output Wexp1.25=Watts W1expWexp1000⋅:= W1exp1.2510 3 ×=mWatts ___________________________________________________________________________ Antenna gain 9/13/2007 Page 2 of 3 FCCID: MMASD225U2 Conclusion: The device complies with the MPE requirements by providing a safe separation distance of 34.1 cm between the antenna, including any radiating structure, and any persons when normally operated . Proposed RF exposure safety information to include in User’s Manual: “FCC RF Exposure Requirements: CAUTION: The antenna(s) used for this transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. This device is approved with emissions having a source-based time- averaging duty factor not exceeding 25%. Vehicle – Antenna Installation: - Antennas used for this transmitter must not exceed an antenna gain of 6 dBi with a minimum cable loss of 1dB. - For rear deck trunk and roof top installations, the antenna must be located at least 34.1 cm away from rear-seat passengers and bystanders in order to comply with the FCC RF exposure requirements. Failure to observe these restrictions will result in exceeding the FCC RF exposure limits. 9/13/2007 Page 3 of 3 FCCID: MMASD225U2

FCC PART 90 AND IC RSS-119, RSS-GEN TEST REPORT APPLICANT MIDLAND RADIO CORPORATION 5900 PARRETTA DRIVE KANSAS CITY MO 64120 USA FCC ID MMASD225U1 IC CERTIFICATION 3690A-SD225U1 MODEL NUMBER SD225U1 PRODUCT DESCRIPTION DATA MODULE DATE SAMPLE RECEIVED 8/14/2007 DATE TESTED 8/21/2007 TESTED BY Joe Scoglio APPROVED BY Mario de Aranzeta TIMCO REPORT NO. MIDLANDRADIO_MMA\2818UT7TestReport.doc TEST RESULTS PASS FAIL THE ATTACHED REPORT SHALL NOT BE REPRODUCED EXCEPT IN FULL WITHOUT THE WRITTEN APPROVAL OF TIMCO ENGINEERING, INC. TABLE OF CONTENTS 849 NW STATE ROAD 45 NEWBERRY, FL 32669 USA PH: 888.472.2424 OR 352.472.5500 FAX: 352.472.2030 EMAIL: [email protected] HTTP: //WWW.TIMCOENGR.COM Certificate # 0955-01 Applicant: MIDLAND RADIO FCC ID: MMASD225U1 Report: M\MidlandRadio\MMA_\2818UT7\2818UT7TestRe…

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