Related Manuals for Ritron DTX-165-0
Summary of Contents for Ritron DTX-165-0
- Page 1 RITRON, INC. PRELIMINARY 08-16 RITRON MODELS DTX-X65 SERIES PROGRAMMABLE FM TRANSCEIVER MODULES MAINTENANCE & OPERATING MANUAL PRELIMINARY! FOR USE ONLY BY AUTHORIZED SERVICE/MAINTENANCE PERSONNEL...
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Page 2: Table Of Contents
TABLE OF CONTENTS DTX MODULES INTRODUCTION GENERAL MODEL IDENTIFICATION FCC REGULATIONS MODELS DTX-965 SPECIFICATIONS GENERAL TRANSMITTER RECEIVER DTX-965 INPUT/OUTPUT CONNECTOR ACCESSORIES OPERATION CHANNEL SELECTION POWER SUPPLY VOLTAGE DUTY CYCLE/KEY-DOWN LIMITATIONS OPERATING MODES RNET COMPATIBILITY MODE PROGRAMMING PC PROGRAMMING KIT LOADING THE PROGRAMMING SOFTWARE COMPUTER SOFTWARE COPYRIGHTS USING THE PROGRAMMING SOFTWARE PROGRAMMER MENUS... -
Page 3: Introduction
INTRODUCTION GENERAL The RITRON High Power DTX 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, 350 MHz, and 900 MHz region. Each of eight channels can be programmed to contain a unique set of operating frequencies. -
Page 4: Fcc Regulations
The part number system for a stand-alone RF board/Heat Sink assembly is the same as that for a module except that “F” designator (regulator option) does not exist and a “D” is appended at the end. FCC REGULATIONS 1.3.1 LICENSING For those frequency bands governed by FCC rules, the FCC requires that the radio owner obtain a station license for his radio before using the equipment to transmit, but does not require an operating license or permit. - Page 5 Federal Communications Commission Regulations: The FCC rules require manufacturers to comply with the FCC RF energy exposure limits for mobile 2-way radios before they can be marketed in the U.S. When 2-way radios are used as a consequence of employment, the FCC requires users to be fully aware of and able to control their exposure to meet occupational requirements.
- Page 6 Ritron accessories supplied or designated for this product. Use of other accessories may not ensure compliance with the FCC’s RF exposure guidelines, and may violate FCC regulations. • For a list of Ritron approved accessories see this user manual, or visit the following website which lists approved accessories: www.ritron,com...
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Page 7: General
SPECIFICATIONS GENERAL FCC/IC Identifier Model DTX-165-0 AIERIT34-1650 1084A-RIT341650 DTX-265-0 AIERIT34-2650 1084A-RIT342650 DTX-365-0 AIERIT34-3650 1084A-RIT343650 DTX-465-0 AIERIT34-4650 1084A-RIT344650 DTX-965-0 AIERIT34-9650 1084A-RIT349650 FCC Rule Parts Industry Canada Rule Parts RSS-119 Frequency Ranges DTX-165-0 136-174 MHz DTX-265-0 216-217MHz, 220-222 MHz DTX-365-G 340-360 MHz*... - Page 8 Supply Input Connector 2-Pin Molex Data Interface 15 pin subminiature D type -30 to +60 C Operating Temperature 6.6” x 5.0” x 2.4” including connectors Maximum Dimensions (L x W x H) Weight 35 oz.
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Page 9: Transmitter
TRANSMITTER( DTX-965) Operating Bandwidth Up to the span of the sub-band RF Output Power (internally adjustable) 5 to 30 watts Duty Cycle 5 to 100 % depending upon ambient temperature(see chart elsewhere in manual) RF Load Impedance 50 ohms Modulation Distortion (per TIA/EIA 603) 5 % max. -
Page 10: Receiver
RECEIVER (DTX-965) Operating Bandwidth Up to span of the sub-band Sensitivity (12 dB SINAD @ 1 kHz w de-emphasis) 0.25 uV (-119.0 dBm) typical RF Input Impedance 50 ohms nominal Adjacent Channel Selectivity +/- 12.5 kHz w narrow IF 60 dB min. Spurious and Image Rejection IF/2 100 dB min. - Page 11 DTX INPUT/OUTPUT CONNECTORS DB-15 Connector Pinout Pin Number Name Description Comments Channel Select low bit Channel Select mid bit Channel Select high bit MIC IN Microphone Input Input for microphone type signals to be transmitted. Signals at this input are pre- emphasized, limited, and filtered.
- Page 12 1000 ohms unless the resultant voltage drop is accounted for. PGN IN/OUT-Connect via RITRON DTXP-PCPK PC Programming Kit to computer for programming the unit. CTS-Clear-To-Send output from the unit which indicates that the unit is transmitting a carrier at the correct frequency and power level and is ready to accept an input signal to be transmitted.
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Page 13: Accessories
AUDIO OUT-This is the output of the audio power amplifier. This output can drive up to 100 milliwatts into an 8 ohm load. The output level can be controlled by programming. De-emphasis can be applied to this output, but not independently of the AUX OUT output. -
Page 14: Operation
Do NOT apply voltages outside the range of 0 to +5 volts to these pins. Note: When the Ritron programming cable is connected, these pins are not connected and thus, assume a logic high state. Therefore, the radio will be on channel 8 when the Ritron programming cable is connected. -
Page 15: Duty Cycle/Key-Down Limitations
Transmit Mode – 5 watt output power Supply Voltage Internal Regulator Current Drain 11.0 V 3.4 A 12.5 V 3.9 A 16.0 V 4.8 A Warning: Although the output power can be set as low as 5 watts, and the module is certified as low as 5 watt, operation below 5 watts output power is not recommended. -
Page 16: Operating Modes
AC coupled, but can be modified for DC coupling. This requires replacing a coupling capacitor with a zero-ohm resistor. Contact Ritron for details on this modification. The AUDIO OUT is always de-emphasized, but its gain can be programmed. This output can drive 8-ohm speaker- type loads. -
Page 17: Rnet Compatibility Mode
The end user/system integrator would then bear the responsibility of obtaining certification or operating in a frequency band where certification is not required. Contact RITRON for details. Note: Most modems will connect directly to the DTX without requiring any special modifications or programming. -
Page 18: Programming
RITRON, Inc. except for the non-exclusive, royalty fee license to use that arises in the sale of a product, or as addressed in a written agreement between RITRON, Inc. and the purchaser of RITRON, Inc. products. -
Page 19: Programmer Menus
PROGRAMMER MENUS The DTX Programmer has five menus or pages, selectable via tabs at the top of each page, which are always visible. These pages are: 1. Frequency-Used to program the channel frequencies of the radio. 2. Settings-Used to set programmable features/functions of the radio. 3. - Page 20 TX Pre-emphasis- Allows for the signal path from AUX IN and the MIC IN input to be either pre- emphasized or flat. Most applications where the AUX IN input is used work best with a flat response. Factory default is flat response. RX De-emphasis- Allows for the signal path from the discriminator to the AUX OUT and Audio Out to be either de-emphasized or flat.
- Page 21 Monitor Polarity- The monitor input is used to override the action of the receiver squelch (mute) when squelch is active. This function sets the polarity, active low or active high, of this input. When active, squelch is disabled, even is enable via the Squelch Enable setting above. PTT/RTS Input Logic Level- Sets the polarity of the PTT/RTS input.
- Page 22 Audio PA Gain- Sets the audio level of the AUDIO OUT output. Note that the AUDIO OUT level is also affected by the Aux Out(RX) Gain setting. Therefore, the Aux Out(RX) Gain should be set before setting the Audio PA Gain, even if the AUX OUT output is not being used. If the AUX OUT output is not being used, the Audio PA Gain should be set to 0.
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Page 23: Maintenance
The parts within the shield are low failure items; repair or replacement should not be required unless the RF board is mishandled. If failure of a part within the shield is deemed to have occurred, the RF board should be returned to RITRON for service or replacement. -
Page 24: Theory Of Operation
3) Re-assembly is the reverse of assembly with the rear screws installed before the side screws. THEORY OF OPERATION DTX-965 RF BOARD 8.1.1 RECEIVER RF amplifier and Bandpass Filters The incoming RF signal from the antenna connector passes backwards through the transmitter harmonic filter and to a diode switch. - Page 25 The output of the VCO is amplified to a level of about 0 dBm by Q401 and Q402. Q603 with R602, R603, CR601, C603 and C604 act as a very low noise power supply filter for the VCO. 8.1.2 TRANSMITTER PA Driver Stages The output of the VCO buffer drives Q204 and Q203 to provide a drive level to the RF PA device of about +17 dBm.
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Page 26: Control/Loader Board
The AUX OUT output is normally AC coupled through C372. If DC coupling is desired, an 0805 size SMD zero ohm jumper resistor (RITRON P/N 47100000) must be soldered in the location of C372. (In lieu of a zero ohm jumper, a small piece of wire may be carefully soldered between the pads.) The AUX OUT DC level then becomes nominally 1.67 volts. -
Page 27: Alignment
RF BOARD OPTIONS 9.2.1 DISCRIMINATOR POLARITY The polarity of the discriminator output at pin 14 of J102 is configured at the factory such that an increase in RF frequency causes an increase in DC voltage. This is considered “normal” mode. An inverted mode is available where an increase in frequency causes a decrease in voltage. - Page 28 The programmer must be connected to the unit via the programming interface cable and the alignment screen selected. During alignment, the channel may be selected via the channeling control lines on the module or through the programmer. A channel pull-down menu allows for the selection.
- Page 29 To determine the state of the DCD output, connect a DC coupled oscilloscope or DVM to the DCD output. It may help to disable the squelch via the Monitor input or Monitor button on the programmer so that the receive audio signal can be continuously observed i.e. not squelched when DCD is false.
- Page 30 An FM demodulator should be connected to the RF output of the module through a suitable power attenuator or coupler. The demodulator filters should be set for no de-emphasis, as low a highpass cutoff as possible (<50 Hz, preferably down to DC), and a lowpass cutoff of approximately 15 kHz.