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- DTX-165-0
- Maintenance and operating manual
Ritron DTX-165-0 Maintenance and operating manual
Summary of 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.
Page 2: Table Of Contents
Table of contents i dtx modules 1 introduction 1.1 general 1.2 model identification 1.3 fcc regulations 2 models dtx-965 specifications 2.1 general 2.2 transmitter 2.3 receiver 3 dtx-965 input/output connector 4 accessories 5 operation 5.1 channel selection 5.2 power supply voltage 5.3 duty cycle/ke...
Page 3: Introduction
1 introduction 1.1 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 con...
Page 4
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. 1.3 fcc regulations 1.3.1 licensing for those frequency bands governed by fcc rules, the fcc requires t...
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 a...
Page 6
Note - table 1 lists the recommended minimum lateral distance for bystanders in an uncontrolled environment from transmitting types of antennas (i.E., monopoles over a ground plane, or dipoles) at several different ranges of rated radio power for mobile radios installed on a vehicle. For mobile appl...
Page 7
2 specifications 2.1 general fcc/ic identifier model fcc ic 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 90 industry canada rule p...
Page 8
Supply input connector 2-pin molex data interface 15 pin subminiature d type operating temperature -30 to +60 c maximum dimensions (l x w x h) 6.6” x 5.0” x 2.4” including connectors weight 35 oz..
Page 9
2.2 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. Modula...
Page 10
2.3 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. Image &...
Page 11
3 dtx input/output connectors db-15 connector pinout pin number name description comments 1 cs0 channel select low bit 2 cs1 channel select mid bit 3 cs2 channel select high bit 4 mic in microphone input input for microphone type signals to be transmitted. Signals at this input are pre- emphasized, ...
Page 12
3 cs2-most significant bit of the channel select lines. Active high 5 volt ttl/cmos level. Internal 10 k pull-up to +5 volts. Channel cs2 cs1 cs0 1 0 0 0 2 0 0 1 3 0 1 0 4 0 1 1 5 1 0 0 6 1 0 1 7 1 1 0 8 1 1 1 0 = logic low 1 = logic high note: due to the internal pull-up resistors, the unit default...
Page 13: Accessories
12 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. Note that this output level varies w...
Page 14: Operation
5 operation 5.1 channel selection the dtx module supports eight channels. The desired channel is chosen via pins 1, 2, and 3 of the 15 pin connector as shown: channel pin 3 (cs2) pin 2 (cs1) pin 1(cs0) 1 0 0 0 2 0 0 1 3 0 1 0 4 0 1 1 5 1 0 0 6 1 0 1 7 1 1 0 8 1 1 1 0 = logic low (0 to 0.3 vdc) 1 = l...
Page 15
Transmit mode – 5 watt output power supply voltage internal regulator current drain 11.0 v yes 3.4 a 12.5 v yes 3.9 a 16.0 v yes 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 recommende...
Page 16
5.5 operating modes 5.5.1 receive carrier detect and squelch operation the dtx 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...
Page 17
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 s...
Page 18: Programming
6 programming to program dtx module, the ritron pc programming kit, dtxp2-pcpk-1, must be used. 6.1 pc programming kit the user should install the programming software on the host computer. The ritron adapter cables connect the radio to a computer’s serial communications port. Once the cables are ho...
Page 19
6.5 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. Alignme...
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 t...
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 lo...
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 bein...
Page 23: Maintenance
Ii maintenance 10 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 warran...
Page 24: Theory Of Operation
3) re-assembly is the reverse of assembly with the rear screws installed before the side screws. 8 theory of operation 8.1 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 ...
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 p...
Page 26: Hardware Options
8.2 control/loader board the control/loader board is responsible for controlling the operation of the rf board and for processing the audio input and output signals to and from the rf board and to and from the outside. Audio chain the audio processing, both transmit and receive, is handled by the au...
Page 27: 10 Alignment
9.2 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 i ncrease in rf frequency causes an increase in dc voltage. This is considered “normal” mode. An inverted mode is available where an increase in freq...
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. Also, the uni...
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. 10.2....
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 ( approximately 15 khz. The demodulator output should be connected to an oscilloscope so...