AIERIT20-250220 MHz TRANSCEIVER

TYPE OF EXHIBIT:PHOTOGRAPHS-EXTERNAL FCC PART:2.1033(c)(12) MANUFACTURER:RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL:DTX-254 TYPE OF UNIT:220 MHz Transceiver Module FCC ID:AIERIT20-250 DATE:December 23, 2004 External views of the unit follow:

TYPE OF EXHIBIT:EQUIPMENT LABELS FCC PART:2.1033(c)(11) MANUFACTURER:RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL:DTX-254 TYPE OF UNIT:220 MHz Transceiver Module FCC ID:AIERIT20-250 DATE:December 23, 2004 Drawing of label showing a) certification number, b) manufacturer’s name and c) model name or number. The label is located on the top of the unit as shown in the photograph on the next page. FCC ID: AIERIT20-250 IC: 1084A-DTX254 RITRON, INC. 505 W. Carmel Dr. Carmel, IN 46032 1-800-872-1872 www.ritron.com MODEL: DTX-254 MADE IN THE USASN: 4.1 cm 2.3 cm 12345

TYPE OF EXHIBIT:PHOTOGRAPHS-INTERNAL FCC PART:2.1033(c)(12) MANUFACTURER:RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL:DTX-254 TYPE OF UNIT:220 MHz Transceiver Module FCC ID:AIERIT20-250 DATE:December 23, 2004 Internal views of the unit follow:

TYPE OF EXHIBIT:OPERATIONAL DESCRIPTION FCC PART: 2.1033(C)(4), (5), (6), (7), (8), (10) MANUFACTURER:RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL:DTX-254 TYPE OF UNIT:220 MHz Transceiver Module FCC ID:AIERIT20-250 DATE:December 23, 2004 DESCRIPTION: The DTX-254 is a transceiver module designed to operate in the 220 MHz band. In the portion of this band where 5 kHz channels are the norm, this product is designed to use 3 contiguous channels to effect a 12 kHz occupied bandwidth. Also, this product can support 12.5 kHz channel operation. TYPES OF EMISSIONS: 11K1F3E and 11K0F1D FREQUENCY RANGE: 217-245 MHz RANGE OF OPERATING POWER: 1.0 to 6.0 watts 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), Y101, 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. 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 amplifiers, IC310-B and IC310-D. 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 40 dB stopband loss. CIRCUIT DESCRIPTION-MODULATION LIMITING: The modulation limiter is an operational amplifier, IC310-B, which is allowed to clip against its power supply rails. This limits the maximum deviation and thus, the maximum occupied bandwidth. CIRCUIT DESCRIPTION-POWER LIMITING: The RF output power is limited by the drain voltage and the power control voltage on the final RF power amplifier module. When adjusted per the alignment procedure in the maintenance manual, the maximum licensed power output will not be exceeded.

TYPE OF EXHIBIT:SEMICONDUCTOR LIST MANUFACTURER:RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL:DTX-254 TYPE OF UNIT:220 MHz Transceiver Module FCC ID:AIERIT20-250 DATE:December 23, 2004 List of semiconductors follows: Control Loader Board Ref. Des.Ritron P/NVendor P/NFunction CR30148A1005CMMBD7000Dual switching diode CR30248A1005CMMBD7000Dual switching diode CR30348A1005CMMBD7000Dual switching diode CR30448A1005CMMBD7000Dual switching diode CR30548A1005CMMBD7000Dual switching diode CR30648A1005CMMBD7000Dual switching diode CR30748A1005CMMBD7000Dual switching diode CR30848A1005CMMBD7000Dual switching diode CR30948A600011N4001Power Diode IC30131010004LM386Audio PA IC302314G0002MC68HC705Microprocessor IC3033113405374HC4053Analog Switch IC30431010015MC33204Quad Op-Amp IC3053113405374HC4053Analog Switch IC30631010015MC33204Quad Op-Amp IC307310K0001DS3088Digital Pot IC30831010015MC33204Quad Op-Amp IC3093113405374HC4053Analog Switch IC31031010015MC33204Quad Op-Amp IC31131210001X24C04EEPROM Memory IC31431010001LP29515-volt Regulator IC31603131027LM317Voltage Regulator IC31731040002MC780LC505-volt Regulator Q30148180001BCP69SMT Power Transistor Q3024801001QMMBT5088Small signal Transistor Q3034801002AMMBT3906Small signal Transistor Q30448010R02MUN2211Transistor w bias Q30548010R02MUN2211Transistor w bias Q30648010R02MUN2211Transistor w bias RF Board Ref. Des.Ritron P/NVendor P/NFunction CR10148A1005CMMBD7000Dual Switching Diode CR103480100A2MA4CP101PIN diode CR104480100A2MA4CP101PIN diode CR10548C10AQ3SMV1236-004Varactor diode CR10648C1004GMMBV2101Varactor diode CR10748A1004DMMBV3401PIN diode CR10948B1008KMMBZ5235Zener diode CR11048A1005CMMBD7000Dual switching diode IC1013151AAASMAX2681Mixer IC10231030006TA31136IF subsystem IC10331010008LM2904Op-amp IC10404801513RA07M2127MRF PA IC1063112741474HC14Inverter IC107310E0002LM2980Voltage regulator IC108310E0002LM2980Voltage regulator IC109313K0003LMX2352Synthesizer Y101230500032305000314.4 MHz oscillator

1 TYPE OF EXHIBIT:RF EXPOSURE EVALUATION MANUFACTURER:RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL:DTX-254 TYPE OF UNIT:220 MHz Transceiver Module FCC ID:AIERIT20-254 DATE:December 23, 2004 PROCEDURE: Because this product can be 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 Industry Canada. 2. The DUT was aligned for transmitter operation on 230.025 MHz at the 6.0 watt maximum output power rating of the DTX-254 per the tune-up procedure outlined in the Maintenance Manual. The unit was then terminated at the antenna port in a quarterwave 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 230 MHz. 2 TYPE OF EXHIBIT:RF EXPOSURE EVALUATION MANUFACTURER:RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL:DTX-254 TYPE OF UNIT:220 MHz Transceiver Module FCC ID:AIERIT20-250 DATE:December 23, 2004 PROCEDURE (CONT.): 4. The quarterwave 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 quarterwave antenna at the DTX-254’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 MANUFACTURER:RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL:DTX-254 TYPE OF UNIT:220 MHz Transceiver Module FCC ID:AIERIT20-250 DATE:December 23, 2004 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 MANUFACTURER:RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL:DTX-254 TYPE OF UNIT:220 MHz Transceiver Module FCC ID:AIERIT20-250 DATE:December 23, 2004 RESULTS FOR EIRP: AntennaPr PgenPs GaERPEIRP (dBm) (dBm) (dBm)(dBd) (dBm) (watts) Quarterwave+11.5 -0.3-27.3 0.1+38.4 11.3 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 environment is 0.2 mW/cm 2 . Converting to W/m 2 , the limit becomes 2.0 W/m 2 . The MPE limit of 2.0 W/m 2 is substituted for S and EIRP is entered in the above equation. 5 TYPE OF EXHIBIT:RF EXPOSURE EVALUATION MANUFACTURER:RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL:DTX-254 TYPE OF UNIT:220 MHz Transceiver Module FCC ID:AIERIT20-250 DATE:December 23, 2004 RESULTS FOR MPE: AntennaEIRPS limitDistanceDistance (watts)W/m 2 cm in Quarterwave11.3 2.0 67 26 RF WARNING STATEMENT: The following statement appears in the User/Maintenance Manual regarding RF safety: The DTX-254 has been evaluated for compliance with the maximum exposure limits for RF energy at the maximum power rating of the unit with a common unity gain quarterwave magnetic mount mobile antenna. To ensure compliance with the General Population/Uncontrolled maximum exposure limits, please observe the following: When the quarterwave remote magnetic mount antenna is used, mount the antenna in a location that will ensure that all persons will be at least 26 inches (67 cm) away from the antenna. Antennas other than a quarterwave magnetic mount antenna must be tested with the DTX-254 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.