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Summary of Contents for Spectra Engineering MX950 Series
- Page 1 SPECTRA ENGINEERING PTY LTD DMR Repeater Technical Manual MX950...
- 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 L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement. © SPECTRA ENGINEERING 2003 Revision 1.1.4...
- Page 5 MX950 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 3. Operation of the MX950 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. © SPECTRA ENGINEERING 2003 Revision 1.1.4...
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Page 7: Table Of Contents
CN4 Pinouts ................20 MX950 Specifications ................21 5.3.1 Operating Frequency Bands ............21 5.3.2 General ..................22 5.3.3 Transmit ..................23 5.3.4 Receive ..................24 5.3.5 Ancillaries .................. 24 MX950 Model Number Configuration Guide ......... 25 © SPECTRA ENGINEERING 2022 Revision 1.0.0... - Page 8 MX950 Base Station & Repeater Technical Manual © SPECTRA ENGINEERING 2022 Revision 1.0.0...
- Page 9 Table 5-1 MX950 Interface Connectors ................ 19 Table 5-2 General Specifications .................. 22 Table 5-3 Transmit Specifications ................. 23 Table 5-4 Receive Specifications ................... 24 Table 5-5 Ancilary Specifications .................. 24 Table 5-6 MX950 frequencies bands ................25 © SPECTRA ENGINEERING 2022 Revision 1.0.0...
- Page 10 Figure 1-1 MX950 Front Horizontal View ............... 3 Figure 1-2 MX950 Rear Panel..................6 Figure 4-1 Mod Under (increase level) ................. 17 Figure 4-2 Mod Over (decrease level) ................17 Figure 4-3 Correctly Aligned Waveform ............... 17 viii © SPECTRA ENGINEERING 2022 Revision 1.0.0...
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Page 11: General Description
The flexibility of the MX950 series allows it to be configured for a wide range of applications without removing any covers. Standard MX950 applications include: ... -
Page 12: Physical Description
1.1 Physical Description The MX950 series equipment is a cost effective professional solution with full sub band capability. Packaged in an compact hand portable carry case suitable for instant deployment. Its 296mm High, 228mm Deep, 174mm Wide and the weight is less than 5.4kg... -
Page 13: Front Panel
“chopped” by the squelch action. To prevent this, simply decrease the squelch to allow the signal to be heard clearly. Alternatively, you can reduce the squelch sensitivity as described above to block out unintentional weak signals. © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 14: Table 1-1 Led Functions
ALARM: Low power supply voltage; or ALARM: High power supply voltage; ALARM: High reflected power); GOLD ALARM: Low forward power; ALARM: Tx VCO unlocked; ALARM: Rx VCO unlocked; Blue ALARM: PA calibration Table 1-1 LED Functions © SPECTRA ENGINEERING 2022 Revision 1.0.0... - Page 15 Technical Manual Installation and Operation © SPECTRA ENGINEERING 2022 Revision 1.0.0...
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Page 16: 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 MX950 Rear Panel. (RF Connecting cables not shown) © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 17: Module Functional Description
(apart from the RF connections). It controls the operation of the RF sections and acts as the interface between the user controls, indicators and the RF sub sections. Together with the VF DSP chip, processed © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 18: Power Amplifier Module
LDMOS technology and using only two active RF transistors improves efficiency and increases the operating bandwidth. At the same time this reduces the number of components used and further improves the long term reliability. © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 19: Installation And Operation
15 to 17A (band dependent) for 100 Watts, <10A for 50W model on transmit and the gauge of the DC cable fitted to the 12V supply connector should be adequate to ensure less than 0.5V volt drop at this current. © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 20: 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 21: Operation
The MX950 has a channel capacity of 127. The RF frequencies setting for each channel are programmed using the radio configuration menu system channel edit screen. The operating channel is set via a Software channel command to the radio to select the channel. i.e CH001 <ENTER> © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 22: Adjustments
TX reference oscillator frequency. All of these are adjusted with the aid of the built-in radio Alignment menu system. The MX950 comes pre-aligned from the factory, so in most cases no alignment will not be necessary. © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 23: Options
The MX950 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. © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 24: Alignment And Testing
4.1.3 Adding and Setting Channel Alignments The MX950 channel frequencies, subtones and other parameters are setup in the channel edit screen of the radio Channel Edit Menu system and then downloaded to the MX950. © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 25: Setting Ctcss/Dcs
RF input of the MX950 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 menu system provides. © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 26: Temperature Calibration
The transmitter will be modulated with test frequencies (1kHz, & 400Hz tone generators under micro controller control) Adjust the VCO Deviation digital potentiometer using built menu system until the correct deviation is obtained. (See Table 4-1 Peak Deviation Settings). © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 27: Tx Centre Frequency Alignment
Select Tx Reference Oscillator and Output Power and follow the in-built menus instructions. Alter the Reference Oscillator Frequency potentiometer until the channel is “on frequency”. Choose ‘enter’ to accept the changes made. This then saves the changes that you have made to the radio. © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 28: Nominal Deviation
A higher setting of squelch level requires higher received signal strength to un-mute the receiver. A “0” level indicates that there is no squelch suppression function, which is the lowest level. Further information on setting mute (squelch) can be found in Section 1.1.1 © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 29: Appendices
Rear interface board . CN3 - USB type B Connection for the serial port programming. CN4 - DC Supply input , +13V8 DC. CN6 - Ethernet connection. Front panel LED's - See Section 1.1.1. © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 30: Cn4 Pinouts
MX950 Base Station & Repeater Technical Manual 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 31: Mx950 Specifications
IC (ISED) *Conforms but may not be approved. Consult Spectra Engineering regarding current type approvals and for latest and current MX950 Specification Data sheet. 5.3.1 Operating Frequency Bands The MX950 is available in a number of models, which cover the range of operating frequency bands. -
Page 32: 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 33: Transmit
Duty Cycle: 100% for 50W or 100W RF output with thermally controlled fan. RF Rise Time: < 10 mS with continuous VCO selected. < 100 mS with VCO in cold standby. Table 5-3 Transmit Specifications © SPECTRA ENGINEERING 2022 Revision 1.0.0... -
Page 34: 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 35: Mx950 Model Number Configuration Guide
V 100 Watts MX940 Freq Band Band Frequency D5° 148-174 MHz 400-470 MHz P5° 450-520 MHz Table 5-6 MX950 frequencies bands Due to ongoing development please refer to www.spectraeng.com.au for the latest revision of the specifications. © SPECTRA ENGINEERING 2022 Revision 1.0.0...
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