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Summary of Contents for Spectra Engineering MX940
- Page 1 SPECTRA ENGINEERING PTY LTD DMR Repeater Technical Manual MX940...
- Page 3 Email: info@spectraeng.com.au Web: www.spectraeng.com.au In order to continually improve our products, Spectra Engineering Pty Ltd reserves the right to alter, without notice and at any time, the equipment and specifications described in this document. All performance figures quoted are typical and are subject to normal manufacturing and service tolerances.
- Page 4 2.6 m* Canada Customers The MX940 radio transmitter has been approved by Innovation, Science and Economic Development Canada to operate with the maximum permissible exposure (MPE) limits defined in Radio Communication Apparatus (All Frequency Bands) , RSS-102, Issue 5, March 2015.
- Page 5 MX940 Base Station & Repeater Record Of Changes Any changes to this manual are recorded on this list. Spectra Engineering may issue replacement pages to you from time to time. If any updates are issued, you will also receive a replacement for this page.
- Page 6 2. Operation in locations subject to abnormal environmental conditions such as extreme temperatures or ingress of moisture or excessively dusty environments. 3. Operation of the MX940 Transmitter output into an open or short circuit or an incorrectly terminated load. Although a level of VSWR protection is included, greater protection is provided by the addition of a TX RF isolator.
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Page 7: Table Of Contents
CN4 Pinouts ................19 MX940 Specifications ................20 5.3.1 Operating Frequency Bands ............20 5.3.2 General ..................21 5.3.3 Transmit ..................22 5.3.4 Receive ..................23 5.3.5 Ancillaries .................. 23 MX940 Model Number Configuration Guide ......... 24 © SPECTRA ENGINEERING 2022 Revision 1.0.0... - Page 8 MX940 Base Station & Repeater Technical Manual © SPECTRA ENGINEERING 2022 Revision 1.0.0...
- Page 9 Table 2-1 Micro Controller Jumper ................10 Table 4-1 Peak Deviation Settings ................15 Table 4-2 Nominal Deviation ..................17 Table 5-1 MX940 Interface Connectors ................ 18 Table 5-2 General Specifications .................. 21 Table 5-3 Transmit Specifications ................. 22 Table 5-4 Receive Specifications ................... 23 Table 5-5 Ancilary Specifications ..................
- Page 10 MX940 Base Station & Repeater Technical Manual List of Figures Figure 1-1 MX940 Front Horizontal View ............... 3 Figure 1-2 MX940 Rear Panel..................5 Figure 4-1 Mod Under (increase level) ................. 16 Figure 4-2 Mod Over (decrease level) ................16 Figure 4-3 Correctly Aligned Waveform ...............
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Page 11: General Description
The flexibility of the MX940 series allows it to be configured for a wide range of applications without removing any covers. Standard MX940 applications include: ... -
Page 12: Physical Description
MX940 Base Station & Repeater Technical Manual In addition, the MX940 can be fitted with options, not being limited to the following: Power supply Duplexer Batteries for power backup system. Note: Not all options and features may be available at the time of order. Please also refer to Spectra Engineering’s web site for software feature upgrades and additional... -
Page 13: Front Panel
Installation and Operation 1.1.1 Front Panel 1.1.1.1 Standard Front Panel The MX940 front panel provides the user with real time status of the MX940. Figure 1-1 MX940 Front Horizontal View Mute / Squelch Adjustment The squelch is used to eliminate any annoying background noise when there are no signals present. -
Page 14: Table 1-1 Led Functions
MX940 Base Station & Repeater Technical Manual Table 1-1 below explains the functions of the front panel LED's. Each LED indicates the status of the MX940 in real time. COLOR FUNCTION POWER AQUA Indicates the power supply voltage is within limits. -
Page 15: Table 1-2 Rear Panel Connections
Gives the base station an identity as a network element, and provides the physical connections for the Ethernet USB TYPE B Serial Data interface. Table 1-2 Rear Panel Connections Figure 1-2 MX940 Rear Panel. (RF Connecting cables not shown) © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 16: Module Functional Description
1.2 Module Functional Description 1.2.1 RF Module and Main Controller Assembly The MX940 consists of a full duplex RF module with its own shielded metal housing and a Main Controller board integrated on a single PCB. Using advanced yet simplified circuit designs, the size and complexity is reduced. This affords a number of advantages including;... -
Page 17: Power Amplifier Module
An on onboard EEPROM stores all of the user channel related data such as frequencies, CTCSS tones etc. A serial port at the Microphone accessory socket of the MX940 provides access to the Controller card software configurations for the purpose of the user to create and change this channel related information. -
Page 18: Installation And Operation
2.1 Installation The MX940 Radio is securely packed for transport within a pasteboard container. Before unpacking the MX940 radio, please inspect the packaging for signs of damage and report any damage to your MX940 distributor. Upon unpacking of the MX940 radio, please ensure that all items shipped were received, report any missing items to your MX940 distributor. -
Page 19: Screw Head Types
Modern screws employ a wide variety of drive designs, each requiring a different kind of tools to drive in or extract them. Spectra Engineering has chosen the Pozidriv ® screw head and screwdriver as it preferred screw type on all of its products, sizes 1 &... -
Page 20: Operation
MX940 Base Station & Repeater Technical Manual 2.3 Operation The MX940 can operate in local control Base Station mode or Repeater mode via the front panel controls. Setting up the MX940 to operate in the wanted settings is straightforward and involves one main step. -
Page 21: Adjustments
2.3.1.4 Configure Alarm LED The MX940 has an LED to display the status of alarms. The alarm trigger conditions can be set using the built-in radio configuration menu system software. The LED can be set to trigger on low forward power, high reflected power, power supply voltage out of range, VCOs unlocked and high PA temperature. -
Page 22: Options
Technical Manual 3. Options The MX940 also has the provision to mount a Duplexer internally using the a optional mounting plate. Wiring for this cases must be performed by the appropriate qualified personal. Please contact your Dealer or Distributor should you require the appropriate assistance. -
Page 23: Alignment And Testing
Technical Manual Installation and Operation 4. Alignment and Testing The MX940 test and alignment section assumes that the radio is a working module. Due to ongoing development the instructions may vary please refer to www.spectraeng.com.au for updates. 4.1 Transceiver Setup, Calibration and Alignment This section explains how to setup, calibrate and align the complete MX940 Base Station. -
Page 24: Setting Ctcss/Dcs
The RSSI calibration is used to calibrate the RSSI meter on the in-built menu system via Diagnostics Screen. The procedure requires an RF signal generator and the relevant leads to connect the signal generator to the RF input of the MX940 Base Station. RSSI calibration is done via software command To complete the RSSI calibration send the command CALR <enter>, and follow the instructions that in-built... -
Page 25: Temperature Calibration
The procedure requires dummy cable for SKB on the micro controller having a 2060-ohm resistor between pins 4 and 6 of this connector of the MX940 Base Station. Temperature calibration is done via the software command. To complete the temperature calibration send command CALT <enter>, and follow the instructions... -
Page 26: Tx Centre Frequency Alignment
MX940 Base Station & Repeater Technical Manual Adjust the Reference Deviation digital potentiometer until the top of the waveform is flat. If the waveform top droops increase the level (see Figure 4-1) and if it peaks reduce the level (see Figure 4-2). -
Page 27: Nominal Deviation
RF Communications test set +13.8VDC power supply MX940 Testing – Rx Mute: 1. Monitor the front panel RX Led with the base station connected to a RF Communications test set. Inject the correct RF frequency into the receiver for the test channel. -
Page 28: Appendices
MX940 Base Station & Repeater Technical Manual 5. Appendices 5.1 MX940 Interface Connections The user connections to the MX940 are all made via the Front and rear panel where the following connectors are located. Conn Type Function Description Mini-Fit Jr ,4P DC Power input 13.8 Volt DC power input. -
Page 29: Cn4 Pinouts
Technical Manual Installation and Operation 5.2.2 CN4 Pinouts Figure 4.1 CN4 DC INPUT Supply (Mini-Fit Jr Connector) PINS Description + 13V8 DC + 13V8 DC © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 30: Mx940 Specifications
Consult Spectra Engineering regarding current type approvals and for latest and current MX940 Specification Data sheet. 5.3.1 Operating Frequency Bands The MX940 is available in a number of models, which cover the range of operating frequency bands. Refer to Section 5.4 for details of the band breakdown. © SPECTRA ENGINEERING... -
Page 31: General
+/-2.5 kHz narrow band, +/- 5 kHz wide band Channel Spacing: 25 kHz or 12.5 kHz, software selectable. Synthesiser Step Size: 5 kHz or 6.25 kHz. Channels: 127 Software selectable. Table 5-2 General Specifications © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 32: Transmit
MX940 Base Station & Repeater Technical Manual 5.3.3 Transmit Measured in accordance with TIA/EIA-603 standards. Parameter Specification RF Power Output: 1W to 50W or 100W (See model type) 1.0 PPM for –30 to 60C, Frequency Stability: > 300 MHz 2.5PPM for –30 to 60C, <... -
Page 33: Receive
Within +1, -3 dB of 6 dB per octave curve. De-Emphasis Accuracy: Within +1, -3 dB of 6 dB per octave curve. Channel Select: Software Select Repeater Tail Timer: Programmable. Table 5-5 Ancilary Specifications © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 34: Mx940 Model Number Configuration Guide
Technical Manual 5.4 MX940 Model Number Configuration Guide The MX940 build can be specified by the model number. The diagram below shows how the model number is derived from the wanted options. Consult Spectra for availability details on specific configurations and options.
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