AIERIT17-142VHF FM Transceiver Module

0 TYPE OF EXHIBIT: USERS MANUAL FCC PART: 2.1033(c)(3) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 21, 2003 1 DTX-142 PROGRAMABLE VHF FM TRANSCEIVER MODULE OPERATING AND SERVICE MANUAL RITRON INC. 2 TABLE OF CONTENTS SECTION TOPIC PAGE 1. DTX-142 SPECIFICATIONS GENERAL 2 RECEIVER 3 TRANSMITTER 3 SUB-D 15 PIN CONNECTOR 4 2. INTRODUCTION GENERAL 5 Model Identification 5 FCC REGULATIONS Licensing 5 Exposure to Radio Frequency Energy 5 FCC Label 6 MAINTENANCE INFORMATION 6 Surface Mount Repairs 6 Precautions for handling CMOS 7 Synthesizer shield 7 4. DESCRIPTION OF INPUT/OUTPUT 8 5. OPERATION 9 6. PROGRAMMING THE RADIO 10 PROGRAMMING THE RADIO USING A PC COMPUTER 10 Programmable Features 10 COMPUTER SOFTWARE COPYRIGHTS 10 7. DTX-142 THEORY OF OPERATION INTRODUCTION 11 POWER SUPPLY AND VOLTAGE DISTRIBUTION 11 REFERENCE OSCILLATOR 11 SYNTHESIZER 12 RECEIVER 12 Receiver Front End 12 FM Receiver Subsystem 12 Voice and Tone Conditioning 13 TRANSMITTER 13 Voice and Tone Conditioning in Transmitter 13 MICROCONTROLLER 15 8. DTX-142 ALIGNMENT PROCEDURE RECOMMENDED TEST EQUIPMENT 15 RADIO PREPARATION 15 REFERENCE FREQUENCY AND TRANSMITTER POWER 15 TRANSMITTER VOICE AND DATA DEVIATION 16 RECEIVER FRONT END TUNNING 16 RECEIVER SQUELCH 16 3 DTX-142 SPECIFICATIONS GENERAL FCC ID: AIERIT17-142 FCC Rule Parts: 90 Frequency Range: 136-156 MHz or 154-174 MHz RF Channels: 8 Independent TX/RX frequencies Synthesizer Step Size: 5 kHz Frequency Stability: +/-2.5 PPM (-30 to +50 C) Tone/Code Signaling: CTCSS (Quiet Call) and DCS Maximum Data rate: 9600 bps with 4-level FSK Power Supply: 8 to 15 VDC Battery Drain: RX Standby: 20 mA at 13.8 VDC RX Receive: 250 mA Transmit: 1 Amp @ 5 Watts at 13.5 VDC Dimensions: 5”H x 3”W x 1.25”D Weight: 3.8 oz. Antenna Fitting: BNC female or SMA female 4 DTX-142 SPECIFICATIONS RECEIVER Specifications Wide band Narrow band 25 kHz 12.5 kHz Sensitivity (12 dB SINAD): 0.25 μV 0.25 μV Adjacent channel: -70 dB -60 dB Spurious rejection: -55 dB -55 dB Image rejection: -70 dB -70 dB Intermodulation: -60 dB -60 dB FM hum and noise: -43 dB -37 dB Conducted spurious: -57 dBm -57 dBm Receiver attack time: < 15 ms < 15 ms Noise squelch attack time: < 15 ms < 15 ms RSSI squelch attack time: < 5 ms < 5 ms RSSI squelch sensitivity: Manually adjustable; factory set for –109 dBm Noise squelch sensitivity: Manually adjustable; factory set for 12 dB SINAD @ 3 kHz deviation AUX OUT frequency response: 6 - 3000 Hz @ +1 / -3 dB Audio Output >700 mW into 8 Ω, with less than 5 % THD TRANSMITTER RF Power Output: 1.0 Watt minimum @ 13.8 VDC < .4 A 5.0 Watt minimum @ 13.8 VDC < 1 A Voice Emission Designator: 16K0F3E 11K2F3E Data Emissions Designator: 11K2F1D Deviation: +/- 5.00 kHz +/- 2.50 kHz Transmitter attack time: 15 ms 15 ms FM Hum and Noise: -45 dB -40 dB Audio Distortion: < 5 % < 5 % Spurious and Harmonics: -20 dBm max Aux In frequency response: 7 Hz to 2700 Hz @ +1 / -3 dB 5 DTX-142 SPECIFICATIONS Sub D 15 Pin Connector The DTX-142 is equiped with a 15 pin female sub D connector with the following functions: Pin# Function 1 least significant channel select bit (CS0) 2 channel select 1 (CS1) 3 Most significant channel select (CS2) 4 Microphone input 5 High/ low power select (pull low to get low power) 6 + 8 to 15 VDC input 7 auxilary input 8 auxilary ouput 9 PC programing port 10 N/A 11 Auxilary monitor input (pull to ground to open squelch) 12 Speaker output 13 Carrier detect output (pulls to 5 VDC through 390 ohms) 14 PTT (pull to ground to transmit) 15 ground 6 INTRODUCTION GENERAL RITRON's DTX-142 transceiver module is designed to operate in the VHF band. Two band splits are available, 136-156 MHz (low) or 154-174 MHz (high). The unit supports voice through a microphone input and a nominal 1 watt speaker output. It supports up to 9600 bps 4-level FSK through its auxiliary in and auxiliary out ports. Each radio can be “dealer or factory” programmed to contain a unique set of eight operating frequencies and options. When all three channel select inputs are tied to ground the radio operates on channel 1. The channel selection is done in a binary manner on the CS2, CS1 and CS0 inputs. Separate RX and TX Quiet Call (CTCSS) or Digital Quiet call (DCS) tones can be programmed per channel. Each channel can be programmed to be low power (2 watts) or high power (5 watts). Transmitter wide or narrow deviation can be programmed on a per channel basis. Model Identification The DTX-142 model, serial number and FCC Identification are displayed on a label located on the top of the radio VCO shield. FCC REGULATIONS Licensing The FCC requires the radio owner to obtain a station license for his radios before using them to transmit, but does not require an operating license or permit. The station licensee is responsible for ensuring that transmitter power; frequency and deviation are within the limits specified by the station license. The station licensee is also responsible for proper operation and maintenance of the radio equipment. This includes checking the transmitter frequency and deviation periodically, using appropriate methods. Exposure to Radio Frequency Energy: The DTX-142 transceiver consists of a transmitter and a receiver. The transmitter is active when the Push- to-Talk line is connected to ground or when activated electronically and emits radio frequency (RF) energy at a power level up to 5.0 watts. This product has been evaluated for compliance with the maximum permissible exposure limits for RF energy at the maximum power rating of the unit with the whip antenna available from RITRON. To ensure compliance with the General Population/Uncontrolled Exposure RF exposure maximum limits, all persons must be at least 43 cm (16.9 inches) from the antenna while the unit is transmitting. The installer must site the antenna in such a way that all persons would be at least 43 cm (16.9 inch…

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TYPE OF EXHIBIT: MANUFACTURER”S STATEMENT FCC PART: MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 30, 2003 PRODUCT STATEMENT: The RITRON model DTX-142 is a two-way transceiver capable of supporting voice or data communications. It can support voice in either narrowband mode 10K4F3E or wideband mode 14K6F3E. In narrowband mode it is also capable of supporting data rates up to 9600 bps (9K2F1D). Power output can be adjusted from 1 to 5 watts. A DTX-142 will cover 136 to 174 MHz in two overlapping versions. This product will be manufactured and marketed on a continuing basis in the United States by the applicant, RITRON, Inc. of Carmel, IN. TYPE OF EXHIBIT: STATEMENT OF CERTIFYING ENGINEER FCC PART: 2.947 MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 30, 2003 STATEMENT: I, Dennis Zimmerman, am now, and have been for the past 5 years a project engineer at RITRON, Inc. I have been employed in the two-way radio business for the past 17 years. I received a BSEE degree from the University of Cincinnati in 1977. I hereby certify that all the measurements were taken by me, or under my direct supervision and that they were taken using accepted engineering principles and accurately reflect the performance of the unit tested. Further, I attest that manufacturing controls exist such that this data are representative of units which will be manufactured by RITRON. Dennis Zimmerman Project Engineer RITRON, Inc. TYPE OF EXHIBIT: STATEMENT CONCERNING SPECTRUM EFFICIENCY FCC PART: 90.203 (j)(3) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 30, 2003 STATEMENT: I, Dennis Zimmerman, certify that this product, DTX-142, meets the spectrum efficiency standard of one voice channel or 9600 bps of data per 12.5 kHz of channel bandwidth. Dennis Zimmerman Project Engineer RITRON, Inc.

Page 1 of 3 Correspondence Summary Questions and Answers June 12, 2003 SUBJECT: RITRON, INC. - FCC ID: AIERIT17-142 TCB 1.: This device does not appear to be a finished product, as it does not have its own enclosure. Module approval could be an option if the transmitter portion had its own shield. The photos show that the transmitter portion of this device is not entirely covered by a shield. This application was not made for a module approval. Please, explain Applicant 1.: It is RITRON's desire to get Certification on this product as a module approval. As you know, there are no FCC rules which specifically address a module approval, a module being defined as a product without a case and designed to be integrated into another product. There is, however, a policy document, DA 00-1407, which addresses module approval for Part 15 intentional radiators. Some, although not all, of the guidelines in that document could apply to our Part 90 submission. The overarching issue is that the Commission wants devices approved as modules to be essentially installation and enclosure independent i.e. incorporating the module into another piece of equipment and/or enclosure should not jeopardize meeting the regulations involving power, spurious, occupied bandwidth, etc. RITRON's issue is with the requirement that the entire transmitter be shielded. A shield over the entire transmitter should, by logic, prevent RF coupling to other structures (enclosures) by acting as a Faraday shield. In our product, however, it was determined that shielding the entire transmitter section was problematic from both a performance and a practical standpoint. With one large shield, coupling between the RF structures under the shield was a problem especially in meeting conducted spurious emissions. Also, it was very difficult to create a shield of the size required that would allow the unit to meet radiated spurious unless the shield was constructed with no holes and almost completely soldered around its perimeter to the ground plane. From a practical standpoint, this was nearly impossible and created an issue when adjustments were required of some of the components under the shield. Placing holes in the large shield jeopardized meeting the spurious emissions limits. Instead, the greatest performance was achieved by shielding the individual emission radiating components. This included the final transmitting amplifying stage and the inductors in the transmitter low-pass filter. In addition, shields were placed over the matching inductors in the mixer circuit to limit local oscillator radiation from the receiver, over the reference oscillator which determines the frequency stability of the unit, and over the voltage Page 2 of 3 regulator section. This allowed the unit to meet the intent of the policy document, if not the letter. Also, adjustments required by the alignment process could be done without the arduous task of removing a large shield. Our testing with our own enclosure has demonstrated that compliance inside an enclosure should not be a problem. In addition, all input/output pins, including the power input, are de-coupled and buffered. Multiple voltage regulators exist within the unit to make the performance essentially independent of installation and enclosure. TCB 2.: This radio appears to be using a different frequency determining and stabilizing circuitry for the low split 136-156M and high split 154-174M models. If this is the case, each split must be approved separately under its own FCCID. Please, explain. Applicant 2.: The frequency determining section of this device is common to both frequency splits. It consists of a shielded and packaged voltage controlled temperature compensated reference oscillator (VCTCXO) operating at 14.4 MHz. The specifications of the oscillator are in excess of that required by the FCC frequency stability rules. This part of the circuit does not differ between the two splits. TCB 7.: 90.203(e) - Programming capability: It is not explicitly written in the manual that the PC programming features are not available to the end-users, as this transmitter may be programmed outside the authorized frequency band. Please, show compliance with this section. Applicant 7.: Programming this unit requires both a special cable and proprietary programming software, both available only from RITRON and only to qualified RITRON customers. RITRON is very careful about allowing these two items to be sold to those that might be end users. TCB 8.: The Manual lists “The installer should confirm there is no RF interference picked up on the analog and digital control lines coming into the transceiver. “ Please, explain the impact of such statement on this equipment authorization Applicant 8.: This statement was placed in the manual mainly to protect equipment connected to the DTX-142 from RF exposure effects, not the unit itself. The unit is never in danger of not meeting the FCC requirements due to the de-coupling and buffering of the I/O. TCB 10.: Spurious emissions: Compliance testing was demonstrated at Mid-band and for High power only. Please, explain and include a rationale/statement in the test report Page 3 of 3 describing how compliance at 136 and 174MHz and at the lower power setting was determined. Applicant 10.: During emissions testing it was verified that worst case emissions occurred at the 5-watt level, the maximum power for this product. The band edges were checked as well and found to be at, or below, that listed for the center frequency. RITRON will continue to check the product at frequencies across the band and at various power levels and will either bring the unit into line with the values submitted or request a Class II permissive change to update the report. It is understood by RITRON that center frequency data is acceptable to the Commission, but compliance at all frequencies available under the grant parts is required. In any and all variants of power and frequency, RITRON will ensure…

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TYPE OF EXHIBIT: PHOTOGRAPHS FCC PART: 2.1033(c)(12) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Transceiver FCC ID: AIERIT17-142 DATE: May 30, 2003 Top view of DTX-142 with shield in place. Top view of DTX-142 without shield Bottom view of DTX-142

TYPE OF EXHIBIT: FCC ID LABEL FCC PART: 2.1033 (c)(11) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 30, 2003 Description: The FCC ID label will be printed on a .75 x .75 inch non-smearing label. Labels will be numbered sequentially, with an initial 5-digit number of A1234. Records are maintained to track the next available serial number. All DTX-142 models share the same serial sequence. Labels will contain an updated manufacturing date using the Ritron 4-digit date code (YYMM). FCC label attaches to the VCO shield as seen in photograph. RITRON# Model Description 14200138 DTX-142-GS0D PCB with vertical DB15 and SMA, 136-156 MHz 14200139 DTX-142- 0S0D PCB with vertical DB15 and SMA, 154-174 MHz Sample: CARMEL, IN 46032 1-800- RITRON, INC. USA-1-USA FCC ID: AIERIT17-142 MODEL: DTX-142-XXXX SN: A1234 Mfg Date: 0318 TYPE OF EXHIBIT: FCC ID LABEL FCC PART: 2.1033 (c)(11) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 30, 2003 LABEL LOCATION: Photograph of unit showing location of FCC Label follows. FCC LABEL

TYPE OF EXHIBIT: PHOTOGRAPHS FCC PART: 2.1033(c)(12) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Transceiver FCC ID: AIERIT17-142 DATE: May 30, 2003 Top view of DTX-142 with shield in place. Top view of DTX-142 without shield Bottom view of DTX-142

TYPE OF EXHIBIT: OPERATIONAL DESCRIPTION FCC PART: 2.1033 (c)(4), (5), (7), (8), (10) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 30, 2003 DESCRIPTION: The DTX-142 is a board level VHF FM RF transceiver module which operates at a maximum output power of five watts. It covers the frequency band of 136-174 MHz in two overlapping bands. The unit will support either 12.5 kHz or 25 kHz channel bandwidth operation for voice operation and/or 12.5 kHz channel bandwidth operation for data. The unit is designed to be operated in mobile service with an external source of DC power and an external antenna. TYPES OF EMISSIONS: For voice: 10K4F3E and 14K6F3E For data: 9K2F1D FREQUENCY RANGE: 136 to 174 MHz RANGE OF OPERATING POWER: 1.0 TO 5.0 watts MAXIMUM POWER RATING: 5.0 watts TYPE OF EXHIBIT: OPERATIONAL DESCRIPTION FCC PART: 2.1033 (c)(4), (5), (7), (8), (10) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 30, 2003 FINAL AMPLIFYING STAGE VOLTAGES AND CURRENTS: Po (watts) Vd (VDC) Id (A) 1.0 13.8 0.22 2.0 13.8 0.34 3.0 13.8 0.45 4.0 13.7 0.56 5.0 13.5 0.67 Where Po is the output power, Vd is the drain voltage, and Id is the drain current. CIRCUIT DESCRIPTION-STABILIZING FREQUENCY: The basic frequency stability of the unit is determined by the stability of the VCTCXO (voltage- controlled temperature compensated crystal oscillator), Y301, and the voltage which drives the modulation port of the VCTCXO. The VCTCXO is a monolithic device purchased by RITRON and specified to have a frequency stability in excess of that required by the Commission. Sampling of units by RITRON has confirmed that the devices do indeed meet the required stability. The voltage to the modulation port of the VCTCXO is maintained by a high stability voltage regulator. The variation in frequency caused by modulation port voltage variations is at least an order of magnitude below that of the basic VCTCXO. TYPE OF EXHIBIT: OPERATIONAL DESCRIPTION FCC PART: 2.1033 (c)(4), (5), (7), (8), (10) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 30, 2003 CIRCUIT DESCRIPTION-SPURIOUS RADIATION SUPPRESSION: Spurious radiation caused by modulation components is limited by the modulation limiter filter. The modulation limiter filter is an active lowpass filter formed around two operational amplifier sections with a third used for group delay compensation. This active filter has five poles with no transmission zeros. Harmonics of the transmitter carrier are suppressed by a 5-pole elliptic filter which follows the final transmitter stage matching network. This filter has less than 0.5 dB insertion loss and greater than 40 dB of ultimate rejection in the stopband. CIRCUIT DESCRIPTION-MODULATION LIMITING: Modulation limiting occurs by allowing the audio signal to be amplified enough to clip against an operational amplifier’s power supply rails and ground. The clipped signal is then sent to the limiter filter described above. In this product, IC305A and IC308A act as the modulation limiters. CIRCUIT DESCRIPTION-POWER LIMITING: The RF output power is limited by a closed loop power control which measures the current drawn by the final RF power device and adjust the drive level as appropriate to maintain a set current. The set point can be adjusted during alignment for output power levels between one and five watts.

TYPE OF EXHIBIT: SEMICONDUCTOR LIST FCC RULE: MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 30, 2003 The following pages contain a list of the semiconductors used in the DTX-142. Ref Des Ritron# Device # Description CR101 48DB0003 BA782S DIODE CR201 48DB0003 BA782S DIODE CR401 48CB0001 BB153 DIODE CR402 48CB0001 BB153 DIODE CR403 48CB0001 BB153 DIODE CR404 48CB0001 BB153 DIODE CR405 48CB0001 BB153 DIODE CR406 48CB0001 BB153 DIODE D301 48A1005C MMBD7000 DUAL DIODE CATH/ANODE D302 48A1005C MMBD7000 DUAL DIODE CATH/ANODE D303 48A1005C MMBD7000 DUAL DIODE CATH/ANODE D304 48A1005C MMBD7000 DUAL DIODE CATH/ANODE D601 48BA0831 1SMA5913 DIODE D602 48E00B14 MBRS140T3 SCHOTTKY POWER RECTIFIER Q101 482100W2 PBR951 TRANSISTOR, LOW PWR RF, UHF WIDEBAND Q102 4841006U MMBFJ309L TRANSISTOR, RF NFET Q103 48210E2P BFS17A TRANSISTOR Q104 4821003B MMBT918LT1 TRANSISTOR, VHF NPN Q106 4841006U MMBFJ309L TRANSISTOR, RF NFET Q107 4801002A MMBT3906L TRANSISTOR, PNP SMD Q108 48010A8A MMUN2211T1 TRANSISTOR WITH RESISTORS, NPN SMD Q110 48010A8A MMUN2211T1 TRANSISTOR WITH RESISTORS, NPN SMD Q201 480100DH BCW68GLT1 TRANSISTOR, PNP GENERAL PURPOSE Q202 4801001Q MMBT5088 TRANSISTOR, NPN SMD Q203 4801001Q MMBT5088 TRANSISTOR, NPN SMD Q204 48010A6D MMUN2114 TRANSISTOR WITH RESISTORS, PNP SMD Q205 480100DH BCW68GLT1 TRANSISTOR, PNP GENERAL PURPOSE Q206 4801001Q MMBT5088 TRANSISTOR, NPN SMD Q208 487A0002 PD540003 FET, RF PWR Q209 48280003 BFG16A TRANSISTOR, WIDE BAND Q210 4821003B MMBT918LT1 TRANSISTOR, VHF NPN Q302 48010A8A MMUN2211T1 TRANSISTOR, NPN SMD Q303 48010A6D MMUN2114 TRANSISTOR WITH RESISTORS, PNP SMD Q305 48010A6D MMUN2114 TRANSISTOR WITH RESISTORS, PNP SMD Q307 48010A6D MMUN2114 TRANSISTOR WITH RESISTORS, PNP SMD Q309 48010A8A MMUN2211T1 TRANSISTOR WITH RESISTORS, NPN SMD Q310 4801001Q MMBT5088 TRANSISTOR, NPN SMD Q311 48010A8A MMUN2211T1 TRANSISTOR WITH RESISTORS, NPN SMD Q312 480100DH BCW68GLT1 TRANSISTOR, PNP GENERAL PURPOSE Q313 4841006Y MMBFJ177 TRANSISTOR, P-CHANNEL FET Q315 48010A8A MMUN2211T1 TRANSISTOR WITH RESISTORS, NPN SMD Q316 48010A6A MMUN21111 TRANSISTOR WITH RESISTORS, PNP SMD Q404 4841006T MMBFJ310TI TRANSISTOR, GP NFET Q405 4801001Q MMBT5088 TRANSISTOR, NPN SMD Q406 4821003B MMBT918LT1 TRANSISTOR, VHF NPN Q407 482100V0 PBR-941 TRANSISTOR, LOW PWR RF, UHF WIDEBAND Q408 4801001Q MMBT5088 TRANSISTOR, NPN SMD Q409 4801001Q MMBT5088 TRANSISTOR, NPN SMD Q601 48180007 MJD210 TRANSISTOR Q602 4801001Q MMBT5088 TRANSISTOR, NPN SMD Q603 4801001Q MMBT5088 TRANSISTOR, NPN SMD Q604 4801001Q MMBT5088 TRANSISTOR, NPN SMD Q605 484100P3 MMBF0202PLT1 POWER MOSFET 300 mA, 20 VOLT, P-CHANNEL Q606 48010A6D MMUN2114 TRANSISTOR WITH RESISTORS, PNP SMD U101 31030006 TA31136FN I.C., FM IF SUBSYSTEM U104 31010018 LMV393 I.C., COMPARATOR U201 31010008 LMT2904D I.C., DUAL OP AMP U301 314L0002 ATmega8 I.C., MICROCONTROLLER U303 31140002 74V1G14 I.C., SINGLE SCHMITT INVERTER U304 310K0004 LMV324MT I.C., QUAD OP AMP U305 310K0004 LMV324MT I.C., QUAD OP AMP U306 3131009 LM386N-3 I.C., AUDIO PWR AMP U307 31010008 LMT2904D I.C., DUAL OP AMP U308 310K0004 LMV324MT I.C., QUAD OP AMP U401 313K0006 LMX2306TM I.C., PLL SYNTHESIZER U402 31040003 TPS76050DBVR I.C., VOLTAGE REGULATOR U601 310M0001 LM3485 I.C., HYSTERETIC PFET BUCK CONTROLLER Y301 23050003 23050003 14.4 MHZ REFERENCE OSCILLATOR

TYPE OF EXHIBIT: TUNE-UP PROCEDURE FCC PART: 2.1033 (c)(9) MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Two Way Radio Transceiver Module FCC ID: AIERIT17-142 DATE: May 30, 2003 DTX-142 ALIGNMENT PROCEDURE TRANSMITTER VOICE & DATA DEVIATION If the transmitter voice deviation needs adjustment perform the following. 1) Set the RF communications test set to the transmit mode. 2) Set audio filtering from <20 Hz to 15 kHz. 3) Set to FM demodulation with +/- peak deviation. 4) Connect oscilloscope to the demodulated output. 5) Select low edge channel on channel select inputs CS2, CS1 and CS0. 6) Connect sinusoidal 400 Hz audio source to pin 4 microphone input and set to 1 kHz and 100 mV peak-peak . 7) Ground /PTT (pin 14) to transmit. 8) Adjust deviation pot R388 for peak deviation of 4250 +/- 50 Hz.* 9) Adjust the balance pot R304 to give a flat sloop on the demodulated output oscilloscope waveform. 10) Readjust R388 as needed to maintain 4250 Hz deviation. 11) Stop transmitting by releasing the /PTT line on pin 14. 12) Check the upper channel to confirm similar performance. 13) Readjust both channel band edges as needed for the best compromised performance. *NOTE: Sub audible tone deviation is automatically set to be within 600 to 900 Hz after this adjustment on wide band tone channels. Maximum voice and tone deviation on wide band channels will then be 4850 to 5150 Hz. Narrow band tone deviation will be 350 to 500 Hz with overall deviation of 2450 to 2600 Hz. Having set up voice deviation, connect a data source to pin 7 of J301. Adjust R375 to obtain needed data deviation. Typically this will be +/- 3 kHz for a wideband channel and +/- 1.5 kHz for a narrowband channel. RECEIVER FRONT END TUNNING The DTX-142 receiver is factory tuned for a frequency range of 136 to 156 MHz (low split) or 154 to 174 MHz (high split). If receiver appears to be less sensitive on one of the band edges the front end tuning coils may need readjustment. Connect a SINAD meter to the SPEAKER output (pin 12). Unsquelch the audio amp by grounding pin 11. Set the generator to the upper band edge frequency programmed at –121 dBm with +/- 2.5 kHz deviation. Adjust coil cores L101 and L102 in until SINAD starts to drop. Back off slightly to maintain best SINAD. Now, set generator to the lowest frequency programmed at –121 dBm. Similar SINAD readings as the high band edge frequency should be obtained. If not, adjust coils slightly. Recheck high end and balance performance. RECEIVER SQUELCH The DTX-142 is capable of two squelch operating modes. Also, both can operate simultaneously. See the theory above. The units can be configured as the user requires. When the noise squelch is used the radio unsquelches when the carrier SINAD exceeds 12 db. If this is not happening or the squelch opening level needs to be changed perform the following. 1) Select a channel. 2) Adjust squelch pot R144 fully counter clockwise. 3) Ground the MONITOR pin 11 to unsquelch the radio. 4) Adjust the communications test set generator on frequency with an output level to yield a 12 dB SINAD. The deviation should be +/- 1.5 kHz for narrow or 3 kHz for wide with a 1 kHz tone. 5) Release pin 11 from ground to allow squelch to operate. 6) Slowly adjust squelch pot R123 clockwise until squelch opens. 7) Reduce generator level until radio squelches. 8) Increase generator level until audio opens. Confirm squelch hysteresis is between 0.5 and 4 dB. Set up for the RSSI squelch is similar except a fixed level, typically –110 dBm, is set on the generator and the RSSI squelch pot R123 is rotated clockwise until it opens. Ambient noise will affect the level at which the RSSI should be set. The squelch level ideally should be done on the desired frequency, in the actual location the radio will be used and connected to the desired antenna. The level should be set high enough to reject most false signals.

TYPE OF EXHIBIT: TRANSMITTER EFFECTIVE RADIATED POWER FCC PART: MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Transceiver FCC ID: AIERIT17-142 DATE: May 12, 2003 PROCEDURE: 1. The measurement for effective radiated power was taken at the RITRON, Inc. 3-meter test site. The measurement was via the substitution method. 2. The ERP measurement was made with a Hewlett-Packard Model 8560E Spectrum Analyzer and an Electro-Metrics BDA-25 dipole antenna. 3. A substitution antenna, an adjustable dipole, was substituted for the DTX-142 on the turntable 3 meters from the pick up dipole. An RF signal generator was set for the frequency of the DTX-142 at 159.100 MHz with a 0 dBm output level. 4. The height of the BDA-25 receiving dipole was varied to pick up maximum signal. 5. The DTX-142 was programmed for transmitter operation on 159.100 MHz at the 5.0 watt maximum obtainable from the unit. The unit was then terminated at the antenna port with a Nearson RAM1545 antenna, the only antenna available for this product from RITRON. 6. The DTX-142 antenna was then positioned on the turntable and the above procedure used to obtain maximum level at the receiving dipole. TYPE OF EXHIBIT: TRANSMITTER EFFECTIVE RADIATED POWER FCC PART: MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Transceiver FCC ID: AIERIT17-142 DATE: May 12, 2003 CALCULATIONS: The effective radiated power can be calculated as: ERP(dBm) = Pr(dBm) + Pgen(dBm) – Ps(dBm) –Ga(dBd) Where: Pr is the power level of the radio’s emission at the receiving antenna output. Pgen is the RF signal generator level at the substitution antenna input. Ps is the power level of the substitution antenna emission at the receiving antenna output. Ga is the gain of the substitution antenna relative to a dipole. ERP(watts) = antilog((ERP(dBm) – 30)/10) RESULTS: Pr(dBm) Pgen(dBm) Ps(dBm) Ga(dB) ERP(dBm) ERP(watts) 9.5 0 -25.0 0 34.5 2.82 TYPE OF EXHIBIT: MAXIMUM PERMISSIBLE EXPOSURE EVALUATION FCC PART: 1.1310 MANUFACTURER: RITRON, INC. 505 West Carmel Drive Carmel, IN 46032 MODEL: DTX-142 TYPE OF UNIT: VHF-FM Transceiver FCC ID: AIERIT17-142 DATE: May 12, 2003 PROCEDURE: The ERP value measured for this device will be used to determine the minimum safe distance from the antenna supplied by Ritron for use with this product in order not to exceed the Occupational/Controlled Environment RF exposure limits. The ERP must be converted to EIRP by multiplying by 1.64, the gain of the reference dipole. EIRP(W) = 2.8 x 1.64 = 4.62 W Power density as related to EIRP is: S(W/m 2 ) = EIRP/4πr 2 where r is distance from the source in meters. Rearranging for distance: _________ r = √(EIRP/4πS) The MPE for a device operating in the General Population/Uncontrolled Exposure Environment is 0.2 mW/cm 2 . Converting to W/m 2 we get 2 W/m 2 . Therefore: __________ r = √( 4.62 /4π…

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