RITRON, INC.
TABLE OF CONTENTS I DTXM MODULES 1 INTRODUCTION 1.1 GENERAL 2 1.2 MODEL IDENTIFICATION 1.3 FCC/IC REGULATIONS SPECIFICATIONS 2.1 GENERAL 2.2 TRANSMITTER 2.3 RECEIVER 3 DTXM INPUT/OUTPUT CONNECTOR 4 ACCESSORIES 5 OPERATION 5.1 CHANNEL SELECTION 6 5.2 POWER SUPPLY VOLTAGE 5.3 CURRENT DRAIN vs SUPPLY VOLTAGE 5.4 DUTY CYCLE/KEY-DOWN LIMITATIONS 5.5 OPERATING MODES PROGRAMMING 6.1 PC PROGRAMMING KIT 6.2 LOADING THE PROGRAMMING SOFTWARE 6.3 COMPUTER SOFTWARE COPYRIGHTS 6.
1 INTRODUCTION 1.1 GENERAL The RITRON DTXM Plus modules are programmable 2-way radios, which operate either in the VHF or UHF professional FM communications bands as well as a number of other bands in the 220 MHz and 350 MHz region. Each of four channels can be programmed to contain a unique set of operating frequencies. The DTXM Plus module is made up of two PC boards, an RF board and a control/loader board.
F designates the regulator option I=Internal regulator (10-16 VDC operation with regulated RF power amplifier) D=No regulator (7.5 VDC operation) L=RF PA is unregulated, but the remainder of the modem is regulated (10-watt versions) Example: A DTXM-160-OBN6I would be a VHF module for operation between 136 and 174 MHz with a BNC RF connector, narrow (12.5 kHz channel spacing) IF bandwidth, 6 watts maximum output power, and an internal regulator to allow operation from 10 to 15 volts. 1.
This 2-way radio uses electromagnetic energy in the radio frequency (RF) spectrum to provide communications between two or more users over a distance. It uses radio frequency (RF) energy or radio waves to send and receive calls. RF energy is one form of electromagnetic energy. Other forms include, but are not limited to, electric power, sunlight and x-rays. RF energy, however, should not be confused with these other forms of electromagnetic energy, which when used improperly can cause biological damage.
Guidelines: • User awareness instructions should accompany device when transferred to other users. • Do not use this device if the operational requirements described herein are not met. Instructions: • Transmit no more than the rated duty factor of 50% of the time. To transmit (talk or send data), assert the PTT input pin. To receive calls, un-assert the PTT input.
INFORMATIONS DE SENSIBILISATION ET DE CONTRÔLE À L'EXPOSITION AUX ÉNERGIES RF, ET INSTRUCTIONS OPÉRATIONNELLES POUR LES EXIGENCES D'UTILISATION PROFESSIONNELLE DE LA FCC: AVANT D'UTILISER CETTE RADIO À 2 VOIES, LISEZ CES INFORMATIONS IMPORTANTES SUR LA SENSIBILISATION ET LE CONTRÔLE À L'ÉNERGIE RF ET LES INSTRUCTIONS OPÉRATIONNELLES POUR VOUS ASSURER LA CONFORMITÉ AVEC LES DIRECTIVES D'EXPOSITION AUX RF DE LA FCC ET DES IC. CET APPAREIL EST CONFORME À LA PARTIE 15 DES RÈGLES FCC.
allant jusqu'à 50% de conversation et 50% d'écoute et est autorisée par la FCC pour une utilisation professionnelle. En termes de mesure de l'énergie RF pour se conformer aux directives d'exposition de la FCC, votre antenne radio émet de l'énergie RF mesurable uniquement lorsqu'elle émet (pendant la conversation), pas lorsqu'elle reçoit (écoute) ou en mode veille.
Antennes • Installez les antennes en tenant compte des distances latérales minimales recommandées ci-dessus. Ces directives d'installation d'antenne sont limitées aux antennes avec des plans de masse appropriés. L'installation de l'antenne doit en outre être conforme à: a.) Les exigences du fabricant / fournisseur d'antenne. b.) Les instructions de ce manuel, y compris les longueurs minimales de câble d'antenne. c.
2 SPECIFICATIONS 2.1 GENERAL DTXM-160-0 FCC ID: IC ID: AIERIT51-16006 (Pending) 1084A-RIT5116006 (Pending) FCC Rule Parts 90 Industry Canada Rule Parts RSS-119 Frequency Range DTXM-160-0 136-174 MHz Number of Channels 4 Transmit/Receive Spacing Up to the span of the sub-band Mode of Operation Simplex or Half Duplex Frequency Control PLL Synthesizer Channel Increment (Synthesizer step size) DTXM-160 2.5 kHz/3.125 kHz 6.25 kHz Emissions Bandwidth Very narrow mode Narrow Mode 4.0-4.
2.2 TRANSMITTER Operating Bandwidth RF Output Power(internally adjustable) 6 watt version Up to the span of the sub-band 1 to 6 watts (2.5 watts min. recommended) Duty Cycle 5 to 100 % depending upon voltage and power level (see chart elsewhere in manual) RF Load Impedance 50 ohms Modulation Distortion (per TIA/EIA 603) 5 % max.
2.3 RECEIVER Operating Bandwidth Up to span of the sub-band Sensitivity (12 dB SINAD @ 1 kHz w de-emphasis) 0.25 uV (-119.0 dBm) RF Input Impedance 50 ohms nominal Adjacent Channel Selectivity +/-6.25 kHz w very narrow IF +/- 12.5 kHz w narrow IF 45 dB min. 60 dB min. Spurious and Image Rejection IF/2 Image & other 60 dB min. 70 dB min. Intermodulation Rejection 68 dB min. FM Hum and Noise Very narrow channel (5/6.25/7.5 kHz) operation Narrow channel (12.5/15 kHz) operation 40 dB min.
3 DTXM INPUT/OUTPUT CONNECTORS DB-15 Connector Pinout Pin Number Name Description Comments 1 Audio/Mic In External Audio Input Wideband input for data. 2 Audio Out Auxiliary Output Wideband output for data. 3 Speaker Audio PA Output Output of audio PA. 4 CS0 Channel Select low bit 5 RSSI Receive Signal Strength Analog Receive Signal Strength Indicator 6 Raw Supply Supply Voltage Input +10 to +16VDC Input. 7 DISC Out 8 RD Receive Program Data 9 TD Transmit Program Data 10.
4 CS0-Least significant bit of the channel select lines. Active high 5 volt TTL/CMOS level. Internal 10 k pull-up to +5 volts. Channel CS1 CS0 1 2 3 4 0 0 1 1 0 1 0 1 0 = Logic low 1 = Logic high Note: Due to the internal pull-up resistors, the unit defaults to channel 8 if the channel pins are left open (unconnected). Channel 4 would be the nominal channel when the Ritron programmer is connected.
4 ACCESSORIES Note: Programming kits are for use by authorized service/maintenance personnel only. The Programming Kit for DTXM Plus radios (via compatible computer) is model DTXM-NXDNPCPK-1. It includes: 1) Programming Software, DTXM-NXDN-PCPS-1. 2) DB-9 to DB-15 connector cable with power cable. 3) 9-Pin to USB Adapter, 2147C002. Factory programming of channels and features is also optional. Contact the factory for details.
5 OPERATION 5.1 CHANNEL SELECTION The DTXM module supports eight channels. The desired channel is chosen via pins 4 and 11 of the 15 pin connector as shown: Channel CS1 CS0 1 2 3 4 0 0 1 1 0 1 0 1 0 = Logic low 1 = Logic high Note: Due to the internal pull-up resistors, the unit defaults to channel 8 if the channel pins are left open (unconnected). Channel 4 would be the nominal channel when the Ritron programmer is connected.
Warning: Although the output power can be set as low as 1 watt, and the module is certified as low as 1 watt, operation below 2.5 watts output power is not recommended. At low power levels, the output power can vary by 50% or more with variations in ambient temperature. 5.4 Transmit Mode – 3 watt output power Supply Voltage Internal Regulator 7.5 V No 11.0 V Yes 12.5 V Yes 16.0 V Yes Current Drain 1.8 A 1.4 A 1.2 A 0.9 A Transmit Mode – 6 watt output power Supply Voltage Internal Regulator 7.5 V No 11.
5.5 OPERATING MODES 5.5.1 RECEIVE Carrier Detect and Squelch Operation The DTXM is a transceiver; i.e. it can receive and transmit, although not at the same time. A carrier detect system exists within the unit to detect the presence of a carrier which controls the logic state of the DCD (data carrier detect) output. The RF levels at which this output changes state are programmable.
Specialized Modem Operation Modems designed to achieve the highest data rates possible in a radio channel may require a direct DC connection to the modulation path and the removal of the limiter-filter. In order to receive FCC Certification, the DTX module must either be tested and approved with a specific modem connected to the transmitter, or a modulation limiter and limiter-filter must always be present in the transmit modulator audio path with the modulation inputs AC coupled.
6.3 COMPUTER SOFTWARE COPYRIGHTS The RITRON, Inc. products described in this manual include copyrighted RITRON, Inc. computer programs. Laws in the United States and other countries grant to RITRON, Inc. certain exclusive rights in its copyrighted computer programs, including the exclusive right to distribute copies of the programs, make reproductions of the programs, and prepare derivative works based on the programs. Accordingly, any computer programs contained in RITRON, Inc.
4. Update Radio-This button is used to update the radio with all of the changes that have been made via the programmer. Although the radio accepts changes as they are made via the programmer, the changes are volatile i.e. they are lost when the radio is powered off. Clicking on this button makes the changes non-volatile so that they are saved and stored permanently unless changed via the programmer. 5.
RX Discriminator Coupling- Selects whether the coupling from the discriminator output on the RF board is AC or DC coupled to the control/loader board. Since the audio outputs of the control/loader board are AC coupled, this function is normally set for AC as well. Setting this function to DC will extend the low frequency receiver response somewhat, but makes the audio output subject to clipping due to DC offsets on the discriminator output.
6.5.4 SUMMARY The summary page summarizes the information shown on the other three pages and, in addition, includes the model and serial number of the unit. 6.5.5 RESTORE EEPROM This selection is used to load a previously saved radio configuration file to the radio connected to the programmer. This is of benefit when a number of radios are to set to the same frequencies and with the same switch settings.
II MAINTENANCE 7 IMPORTANT MAINTENANCE INFORMATION Surface Mount Repair: RITRON surface mount products require special equipment and servicing techniques. Improper servicing techniques can cause permanent damage to the printed circuit board and/or components, which is not covered by RITRON’s warranty. If you are not completely familiar with surface mount component repair techniques, RITRON recommends that you defer maintenance to qualified service personnel.
2) Board Separation Remove the two screws that secure the control/loader board to the rear bracket. The rear bracket stays connected to the RF board. Remove the two screws that secure the RF board to the front bracket. The front bracket stays connected to the control/loader board. These four screws are removed with a TORX T-9 driver. The two boards are held together by their interconnecting header/socket. Gently pry the two boards apart at the header/socket.
