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Spectra Engineering MX940 Technical Manual Download Page 15

Technical Manual

Installation and Operation

© SPECTRA ENGINEERING 2022 Revision 1.0.0

5

1.1.1.2

Rear Panel

Conn Type

Function

Description

Mini-Fit Jr ,4P

DC Power input

13.8 Volt DC power input.

N TYPE

N type RX input

The input to the receiver for full duplex
operation.

N TYPE

TX output

The RF power output from the transmitter for
full duplex operation.

RJ45

Ethernet

Gives the base station an identity as a network
element, and provides the physical
connections for the Ethernet

USB

USB TYPE B

Serial Data interface.

Table 1-2 Rear Panel Connections

Figure 1-2 MX940 Rear Panel.

(RF Connecting cables not shown)

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Summary of Contents for MX940

Page 1: ...DMR Repeater SPECTRA ENGINEERING PTY LTD Technical Manual MX940...

Page 2: ......

Page 3: ...n this document may be inaccurate due to typographical or other errors or subsequent modifications of the product While every care has been taken in the creation of this document no warranty of accura...

Page 4: ...FREQ RANGE OPERATION SAFE OPERATING DISTANCES MX940N5V 406 1 to 470 MHz 2 6 m Canada Customers The MX940 radio transmitter has been approved by Innovation Science and Economic Development Canada to op...

Page 5: ...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 f...

Page 6: ...ERVICE WHILE TRANSMITTING Thermal or RF burns may result from touching certain components within the power amplifier module while transmitting or operating the transmitter DO NOT SUBSTITUTE PARTS OR M...

Page 7: ...umber and Serial Number 13 4 1 2 Setting the Configuration Information 13 4 1 3 Adding and Setting Channel Alignments 13 4 1 4 Setting CTCSS DCS 14 4 1 5 Power Calibration 14 4 1 6 RSSI Calibration 14...

Page 8: ...MX940 Base Station Repeater Technical Manual SPECTRA ENGINEERING 2022 Revision 1 0 0 vi...

Page 9: ...Connections 5 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...

Page 10: ...ECTRA ENGINEERING 2022 Revision 1 0 0 viii 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 le...

Page 11: ...X940 employs some unique features in its design and much thought and consultation has been used to provide a product that offers an extreme degree of flexibility for the installer and service person F...

Page 12: ...d rack frame and occupies 2RU 89mm The depth of the unit is 330mm and the weight is less than 6kg The unit consists of four main sub assemblies the main RF assembly a Power Amplifier Module Logic cont...

Page 13: ...h is closed the receiver remains quiet when there are no signals present but any incoming signals will override the Squelch and will enable the TTR function When CTCSS DMR colour code is enabled the c...

Page 14: ...open Digital Mode Inbound Slot 1 is receiving the receivers squelch is open RX B AQUA Analog Mode A signal is being received by the receiver or the receivers squelch is open Digital Mode Inbound Slot...

Page 15: ...pe RX input The input to the receiver for full duplex operation N TYPE TX output The RF power output from the transmitter for full duplex operation RJ45 Ethernet Gives the base station an identity as...

Page 16: ...r should the carrier freq need re alignment for future maintenance the TCXO reference oscillator frequency can be adjusted manually or electronically adjusted via software settings The fractional N sy...

Page 17: ...r the control of the processor ensure that user set up levels for TX deviation and power levels are correctly set for each channel 1 2 2 Power Amplifier Module The PA receives the low level modulated...

Page 18: ...of the radio will be affected if any packaging or shipping damage causes the fan to stop working If you intend to install the radio in an equipment rack consult the suppliers instructions for your sys...

Page 19: ...the Pozidriv each slot is the result of two machining processes at right angles The result of this is that the arms of the cross are parallel sided in the case of Pozidriv and tapered in the case of P...

Page 20: ...mode The user will not normally have to change the position of this jumper as it is only used in the initial factory setup J1 is for RF power control type selection This should always be set to D Tab...

Page 21: ...high PA temperature The status of the alarm conditions can be expanded in the on line diagnostics mode Please refer to the radio configuration menu system for additional setup information 2 3 2 Adjus...

Page 22: ...0 12 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...

Page 23: ...ed If the radio has been previously setup and the user intends to recalibrate and align the radio then steps 4 1 1 4 1 2 and 4 1 3 can be ignored as the model number serial number configuration and ch...

Page 24: ...s or DCS codes programmed into the alignment channel as the subtone levels will give a false indication of the peak deviation levels The MX940 contains circuitry that automatically scales the deviatio...

Page 25: ...is The alignment is done using the Alignment Screen in the built menu system To carry out this procedure the demodulated output of the transmitter output needs to be connected to a CRO or some other p...

Page 26: ...illator and re check the deviation alignment as the reference oscillator alignment affects the deviation This may require running through the deviation alignment again after the oscillator alignment p...

Page 27: ...cy into the receiver for the test channel Set the test set generator to the desired muted amplitude i e 119dBm then set the squelch level i e 2 via programmer or Using in built menu system channel edi...

Page 28: ...n RJ45 Ethernet Gives the base station an identity as a network element and provides the physical connections for the Ethernet USB USB TYPE B Serial Data interface Table 5 1 MX940 Interface Connectors...

Page 29: ...hnical Manual Installation and Operation SPECTRA ENGINEERING 2022 Revision 1 0 0 19 5 2 2 CN4 Pinouts Figure 4 1 CN4 DC INPUT Supply Mini Fit Jr Connector PINS Description 1 GND 2 GND 3 13V8 DC 4 13V8...

Page 30: ...S 300 113 ETS 300 489 FCC Part 90 TIA EIA 603 CE Marking IC ISED Conforms but may not be approved Consult Spectra Engineering regarding current type approvals and for latest and current MX940 Specific...

Page 31: ...A for 50W TX RF 13 8VDC Operating Temperature 30 to 60 C Individual Module Dimensions Main board W 153 L 221mm H 22mm PA W 78 L 300 H 60mm Standard LED indicators PWR TX A TX B RX A RX B DIGITAL ANALO...

Page 32: ...io response Flat within 1 3 dB across bandwidth Audio Bandwidth VF input 300 Hz to 3000 Hz LPF Modulation Distortion Less than 3 at 60 deviation S N Ratio Better than 50 dB wide band Better than 45 dB...

Page 33: ...100 dB at 1 MHz point Co Channel Rejection Better than 5 dB Distortion Less than 3 at 60 deviation S N Ratio Better than 50 dB wide band Better than 45 dB narrow band Receiver Front End BW Equal to ba...

Page 34: ...low shows how the model number is derived from the wanted options Consult Spectra for availability details on specific configurations and options Due to ongoing development please refer to www spectra...

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