AIERIT25-15GVHF MODEM TRANSCEIVER

TYPE OF EXHIBIT:DESCRIPTION OF MEASUREMENT FACILITY FCC PART:2.948 MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 The ERP and field strength of spurious emissions measurements filed with this application were made on a site certified by RITRON, Inc. Data pertaining to this site are on file with the FCC and Industry Canada. This site is used on a continuing basis exclusively by RITRON, Inc. and is utilized only for RF field strength measurements of equipment designed and manufactured by RITRON, Inc. It is not used for measurements by, or for, any other party on a contract basis or otherwise. All other measurements were taken at RITRON’s engineering laboratory in Carmel, IN. Sam L. Dulaney Chief Engineer RITRON, Inc. TYPE OF EXHIBIT:MANUFACTURER’S STATEMENT FCC PART: MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 The RITRON model DTXM-154-GBX6 is a VHF Modem Transceiver designed for operation on 6.25 kHz, 12.5 kHz, and 25 kHz channels. Its output power is variable from 1.0 watts to 6.0 watts. This product will be manufactured and marketed on a continuing basis in the United States of America by the applicant, RITRON, Inc. of Carmel, IN. TYPE OF EXHIBIT:STATEMENT OF CERTIFYING ENGINEER FCC PART:2.947 MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 I, Sam L. Dulaney, am now, and have been for the past eight years employed as the Chief Engineer with RITRON, Inc. I have been employed in the two-way radio industry for the past 27 years. I received a BSEE degree from West Virginia University in 1978 and an MSEE degree from West Virginia University in 1980. I hereby certify that all the measurements and data herein were taken by me, or under my direct supervision and that they were obtained using sound and accepted engineering principles and that they accurately reflect the performance and characteristics 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. Sam L. Dulaney Chief Engineer RITRON, Inc. TYPE OF EXHIBIT:ANTI-DRUG ABUSE CERTIFICATION FCC PART:1.2002(b) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 I, Sam L. Dulaney, certify that RITRON is not subject to a denial of Federal benefits, that include FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862 because of a conviction for possession or distribution of a controlled substance. Sam L. Dulaney Chief Engineer RITRON, Inc.

Ritron Inc. 505 West Carmel Dr. Carmel, IN 46032 Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: AIERIT25-15G Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit TypeFile Name Block Diagram Schematics Operational Description Semiconductor List Tune-up Procedure Users Manual DTXM15GBlkDia.pdf DTXM15GSchem.pdf DTXM15GOpDes.pdf DTXM15GPartsLst.pdf DTXM15GTunePro.pdf DTXM15GUserMan.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant is aware that the Commission does not ordinarily grant confidentiality to a Users Manual, but this product is marketed and sold to systems integrators who need highly technical and proprietary information to install, maintain, operate, and service the product. The Users Manual contains such information including a detailed theory of operation, alignment procedures, and circuit descriptions. Therefore, the applicant feels justified in requesting confidentiality of the Users Manual. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Sam L. Dulaney Chief Engineer Ritron, Inc.

TYPE OF EXHIBIT:PHOTOGRAPHS-EXTERNAL FCC PART:2.1033(c)(12) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-0BX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-150 DATE:August 15, 2007 External views of the unit follow: Front of Unit Rear of Unit Top of Unit Bottom of Unit

TYPE OF EXHIBIT:EQUPIMENT LABEL-LOCATION FCC PART:2.1033(c)(11) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-150 DATE:August 15, 2007 Photograph of unit showing location of equipment label follows: The Model Identification Label will be placed on the top of the unit as shown above. The label actually shown in the photo is for illustrative purposes only; the actual label will appear as shown in the Label Sample exhibit. Model Label

TYPE OF EXHIBIT:EQUPIMENT LABEL-SAMPLE FCC PART:2.1033(c)(11) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 Drawing of label showing a) certification number, b) manufacturer’s name and c) model name or number follows. FCC ID: AIERIT25-15G IC: 1084A-2515G RITRON, INC. 505 W. Carmel Dr. Carmel, IN 46032 Telephone: 1-800-872-1872 www.ritron.com MODEL: DTXM-154 MADE IN THE USA SN: 1 2 3 4 5 4.05 cm 2.25 cm

TYPE OF EXHIBIT:PHOTOGRAPHS-INTERNAL FCC PART:2.1033(c)(12) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 Internal views of the unit follow: RF Board-Top View RF Board-Bottom View Modem Board-Top View Modem Board-Bottom View Combined RF Board and Modem Board

1 TYPE OF EXHIBIT:RF EXPOSURE EVALUATION FCC PART:1.1310 MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 PROCEDURE: Because this product is used as a mobile device, an RF evaluation was done. The RF evaluation entailed testing the unit on RITRON’S 3-meter range to determine EIRP and then calculating the minimum safe distance from the antenna necessary to ensure compliance with the appropriate RF exposure limits. 1. The measurement for effective radiated power was taken at the RITRON, Inc. 3-meter test site, details of which are on file with the FCC and Industry Canada. 2. The DUT was aligned for transmitter operation on lower, middle, and upper band edge frequencies at the 6 watt maximum output power rating of the DTXM-154-GBX6 per the tune-up procedure outlined in the Maintenance Manual. The unit was then terminated at the antenna port in a quarter-wave magnetic mount antenna which is typical of what might be used with this product. (The user may connect other antennas, however.) 3. All field strength measurements were made with the Hewlett-Packard Model 8560E Spectrum Analyzer and an Electro-Metrics EM-6924 adjustable dipole antenna tuned to the carrier frequency. 2 TYPE OF EXHIBIT:RF EXPOSURE EVALUATION FCC PART:1.1310 MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 PROCEDURE (Continued): 4. The quarter-wave antenna was connected to the DUT via its cable and tested above a 0.5m x 0.5 m ground plane. The height of the field strength measurement antenna and the azimuth orientation of the antenna were varied to provide maximum field strength. The maximum levels were noted. 5. A substitution antenna, an Electro-Metrics EM-6924 adjustable dipole, was substituted for the quarter-wave antenna at the DTXM-154-GBX6’s previous location. An RF signal generator was set for the frequency of the DUT with the level at the substitution antenna noted. 6. The height of the receiving antenna was adjusted for maximum signal strength. The level at the receiving antenna was noted. 3 TYPE OF EXHIBIT:RF EXPOSURE EVALUATION FCC PART:1.1310 MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 EQUATIONS FOR EIRP: The substitution antenna is specified from the manufacturer in terms of antenna factor rather than antenna gain. The conversion is: Ga(dbd) = 20 log f (MHz) – AF(dB) – 31.9 The effective radiated power (ERP) is then: 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. The ERP is converted to watts from dBm by: ERP(watts) = antilog 10 ((ERP(dBm) – 30)/10) And finally, ERP is converted to EIRP (isotropic radiator) by: EIRP = 1.64 ERP 4 TYPE OF EXHIBIT:RF EXPOSURE EVALUATION FCC PART:1.1310 MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 RESULTS FOR EIRP: FrequencyPr PgenPs GaERPEIRP (MHz) (dBm) (dBm) (dBm)(dBd) (dBm) (watts) 150.030 16.0 0.0-20.0 0.335.76.09 155.50015.8 0.0-20.2 0.335.76.09 161.95015.4 0.0-20.5 0.335.65.95 DETERMINING MPE DISTANCE: Power density is related to EIRP: S(W/m 2 ) = EIRP(W)/4πr 2 where r is the distance from the source in meters. Rearranging for distance: _________ r = √(EIRP/4πS) The MPE (maximum permissible exposure) for a device operating in a General Population/Uncontrolled exposure environment is 0.2 mW/cm 2 . Converting to W/m 2 , the limit becomes 2 W/m 2 . The MPE limit is substituted for S and EIRP is entered in the above equation. 5 TYPE OF EXHIBIT:RF EXPOSURE EVALUATION FCC PART:1.1310 MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 RESULTS FOR MPE: FrequencyEIRPDuty CycleS limitDistance Distance (MHz) (watts) %W/m 2 cm in 150.0306.09 50 2.0 34.8 13.7 155.5006.09 502.0 34.8 13.7 161.9505.95 502.0 34.4 13.5 RF WARNING STATEMENT: The following statement appears in the Users Manual regarding RF safety: The FCC, with its action in General Docket 79-144, March 13, 1985, adopted a safety standard for human exposure to radio frequency electromagnetic energy emitted by FCC regulated equipment. The DTXM product family has been evaluated for compliance with the maximum exposure limits for RF energy at the maximum power rating of the unit and only with the antenna(s) sold for use with this product by RITRON. To ensure compliance with the General Population/Uncontrolled maximum exposure limits, please observe the following: For the AFB-1545 antenna for the DTXM-154 and DTXM-454 and a quarterwave whip for the DTXM-254, mount the antenna in a location that will ensure that all persons will be located away from the antenna by the following minimum distances: ModelMinimum DistanceAnt. Gain inc. cable (dBi) DTXM-154-GBX613.7 in. (34.8 cm) 0 DTXM-154-0BX613.7 in. (34.8 cm) 0 DTXM-254-0BX614.5 in. (36.9 cm) 0.6 DTXM-454-0BX311.3 in. (28.7 cm)-2.7 6 DTXM-454-0BX6 8.0 in. (20.2 cm)-2.7 DTXM-454-0BX9 6.5 in. (16.5 cm)-2.7 Antennas other than those indicated above must be tested with the DTXM for RF exposure compliance in the environment in which it is to be used per the FCC’s OET Bulletin 65, Edition 97-01 or Industry Canada RSS-102.

1 TYPE OF EXHIBIT:LIST OF ATTACHED EXHIBITS FCC PART:2.1033(c)(14) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 The following exhibits are contained in this file: Description of ExhibitPage List of Test Equipment Used 3 Description of Measurement Facility 4 Radio Frequency Output Power 5 Modulator Response 7 Clipper Filter Response 9 Modulation Limiting Curves11 Occupied Bandwidth14 Bandwidth Calculations/Modulation Types36 Conducted Spurious Emissions-Transmitter38 Conducted Spurious Emissions-Receiver40 Field Strength of Spurious Emissions-Transmitter42 2 TYPE OF EXHIBIT:LIST OF ATTACHED EXHIBITS FCC PART:2.1033(c)(14) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 Description of ExhibitPage Field Strength of Spurious Emissions-Receiver47 Frequency Stability vs Temperature51 Frequency Stability vs Supply Voltage53 Transient Frequency Behavior55 3 TYPE OF EXHIBIT:LIST OF TEST EQUIPMENT USED FCC PART:2.947(d) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 All measurements were conducted with one or more of the following pieces of equipment: ITEMMANUFACTURERMODEL NO.SERIAL NO. DC Power SupplyAstronVS 20M9205017 MultimeterFluke456723040 MultimeterBK Precision2704A234-008459 RF Test SetHewlett-Packard8920ABUS39225560 Spectrum AnalyzerAdvantestR3265A75060189 Spectrum AnalyzerHewlett-Packard8560E3720A02980 Storage ScopeFluke/PhilipsPM3335DM630034 Temp. ChamberDelta Design3900 CL0-52-R Audio Test SetAudio PrecisionSYS-322ASYS1-33641 ThermocoupleTriplett320-G/P 4 TYPE OF EXHIBIT:DESCRIPTION OF MEASUREMENT FACILITY FCC PART:2.948 MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 The Field Strength measurements filed with this application were made on a site certified by RITRON, Inc. Data pertaining to this side are on file with the FCC and Industry Canada and are current. This site is used on a continuing basis exclusively by RITRON, Inc. and is utilized only for RF Field Strength measurements of equipment designed and manufactured by RITRON, Inc. It is not used for measurements by, or for, any other party on a contract basis or otherwise. All other measurements were taken at RITRON’s Engineering Laboratory in Carmel, IN. Sam L. Dulaney Chief Engineer RITRON, Inc. 5 TYPE OF EXHIBIT:RADIO FREQUENCY OUTPUT POWER FCC PART:2.1046(a) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 PROCEDURE: 1. The DTXM-154-GBX6 was aligned for transmitter operation at full rated power per the tune-up procedure outlined in the Maintenance manual for frequencies at the lower, middle and upper band edges. 2. Power was supplied to the DTXM-154-GBX6 by an Astron VS 20M Power Supply. The DTXM-154-GBX6 was connected to a HP8920B Test Set used to measure the RF carrier power. The input to the Test Set provides a resistive 50-ohm termination at the frequencies and power levels used for this test. 3. A B&K Digital Multimeter was connected in series with the supply lead of the RF Power Module and set to measure current (Id). A Fluke 45 Digital Multimeter was used to measure the RF Power Module output stage power control voltage (Vcon) and drain voltage (Vd). 4. Measurements were taken at various power levels between 1.0 watts and 6.0 watts. 6 TYPE OF EXHIBIT:RADIO FREQUENCY OUTPUT POWER FCC PART:2.1046(a) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 RESULTS: Frequency (MHz) Po (watts)Vcon (V)Vd (V)Id (A) 150.0301.02.257.260.60 150.0302.02.547.240.81 150.0303.02.627.221.00 150.0304.02.737.201.18 150.0305.02.837.181.34 150.0306.02.957.161.50 155.5001.02.457.260.63 155.5002.02.567.230.87 155.5003.02.667.211.07 155.5004.02.767.181.26 155.5005.02.887.161.46 155.5006.02.997.141.62 161.9501.02.507.250.65 161.9502.02.627.220.91 161.9503.02.727.201.12 161.9504.02.837.181.30 161.9505.02.937.161.50 161.9506.03.047.141.66 7 TYPE OF EXHIBIT:MODULATOR RESPONSE-VOICE INPUT FCC PART:2.1047(a) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 PROCEDURE: 1. The DTXM-154-GBX6 was aligned for transmitter operation at 155.500 MHz at full rated power per the tune-up procedure outlined in the Maintenance manual. 2. The response was measured from the microphone input to the output of the last audio processing op-amp where it connects to the modulator. 3. The audio test set was swept in frequency from 200 Hz to 20 kHz and the results noted. The same circuitry is used for both 12.5 kHz and 25 kHz channel spacing operation, so only one plot is shown. The frequency response is independent of carrier frequency. 8 TYPE OF EXHIBIT:MODULATOR RESPONSE-VOICE INPUT FCC PART:2.1047(a) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 RESULTS:12.5 kHz and 25 kHz channel spacing -60 +10 -50 -40 -30 -20 -10 +0 d B r 20020k5001k2k5k10k Hz 9 TYPE OF EXHIBIT:CLIPPER FILTER RESPONSE-VOICE INPUT FCC PART:2.1047(a) MANUFACTURER:RITRON, Inc. MODEL:DTXM-154-GBX6 TYPE OF UNIT:VHF Modem Transceiver FCC ID:AIERIT25-15G DATE:August 15, 2007 PROCEDURE: 1. The audio output of the audio test set was coupled into the input of the modulation limiter, which is only used for voice inputs. The audio input of the test set was connected to the output of the clipper filter. 2. The audio generator frequency was swept from 200 Hz to 20 kHz and the response noted and plotted. The same clipper filter is used for both 12.5 kHz channel operation and 25 kHz operation. Therefore, only one response is shown. The frequency response is independent of carrier frequency. 10 TYPE OF EXHIBIT:CLIPPER FILTER RESPONSE-VOIC…

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