SPECTRA ENGINEERING Pty Ltd Base Station, Repeater, Receiver and Transmitter MX800 Technical Manual
Technical Manual MX800 Transceiver Spectra Engineering Pty Ltd ABN 65 057 696 438 9 Trade Road Malaga Western Australia 6090 Tel: +61-8-92482755 Fax: +61-8-92482756 Email: info@spectraeng.com.au Web: www.spectraeng.com.au Manual Revision 4.3.1 May 2008 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.
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Technical Manual MX800 Transceiver 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. Date Version Chapter Changes Pages Changed April 1998 2.0 General Revision All May 1998 2.01 Minor corrections i,ii,iii,10,15 May 1998 2.02 Master doc All Oct 1998 2.03 Minor Corrections i,ii,9,27,29,30,35 April 1999 3.
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Technical Manual MX800 Transceiver SAFETY SUMMARY Although there are no dangerous mains voltages present within the equipment, the following general safety precautions as would normally apply, should be observed during all phases of operation, service and repair of this equipment. AROUND THE EQUIPMENT To minimise any possible shock hazard from an external power supply or lightning strike, the chassis or equipment cabinet must be connected to an electrical ground.
MX800 Transceiver Table of Contents Table of Contents vi 1. General Description ................................................................................ 1 1.1 Physical Description ..................................................................... 3 1.1.1 Front Panel ..................................................................... 3 1.1.1 Rear Panel ....................................................................... 6 1.1.2 Side Panel..................................................
Technical Manual Table of Contents 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.10.1 Description ...................................................................... 35 3.10.2 Installation .................................................................... 37 T11 Combined Options .............................................................. 38 T12 External Reference Oscillator Input.................................... 38 3.12.1 Description ..............................................
MX800 Transceiver Table of Contents 5.1.7 5.1.8 5.1.9 5.1.10 5.1.11 5.2 viii Temperature Calibration............................................... 65 TX Power Adjustment .................................................... 65 Peak Deviation and Modulation Balance ..................... 66 TX Centre Frequency Alignment ................................... 67 TX Line Input Level and Nominal Deviation Alignment ...................................................................... 68 5.1.
Technical Manual Table of Contents 7.5 7.6 7.7 7.4.3 Transmit ........................................................................ 91 7.4.4 Receive .......................................................................... 92 7.4.5 Ancillaries ..................................................................... 93 Channel Select DIP Switch Settings .......................................... 93 MX800 Model Number Configuration Guide ............................ 97 MX800 System Applications ..........
MX800 Transceiver Table of Contents List of Tables Table 1-1 LED Functions ........................................................................................... 3 Table 1-2 Rear Panel Connections ............................................................................. 6 Table 2-1 Micro Controller Jumpers ........................................................................ 16 Table 2-2 DIP Switch 2 Settings ...............................................................................
Technical Manual Table of Contents List of Figures Figure 1-1 Standard Front Panel ............................................................................... 4 Figure 1-2 Local Control Front Panel ....................................................................... 4 Figure 1-3 MX800 Rear Panel ................................................................................... 6 Figure 1-4 MX800 Side Panel ....................................................................................
Technical Manual 1. General Description The MX800 series employs state of the art design and construction methods to deliver a range of high performance, ultra reliable radio transceivers. They are ideally suited for use in VHF or UHF two way voice radio systems, however, the MX800 can perform in a range of applications where the added advantage of linear frequency and phase response from DC to 3.4 kHz can be utilised.
MX800 Transceiver General Description The MX800 incorporates special technical features, of which the key ones are listed below: Extremely low conducted emissions Extremely low transmitter spurious Fast transmitter on time Transmitter frequency response down to DC Low group delay distortion Very Wide RF switching bandwidth No re-tune receiver or transmitter Fully software programmable Built in diagnostics Trunking control and VF routing interface Built in community multi-tone style repeater High stability
Technical Manual General Description 1.1 Physical Description The MX800 is a compact lightweight standard 19" rack mounting transceiver. It is designed to mount horizontally in a 19" rack frame and occupies 2RU (89mm). The depth of the unit is 330mm and the weight is less than 9kg. The unit consists of four main sub assemblies an Exciter Module, a Receiver Module, a Power Amplifier Module and a Micro Controller board. These modules are housed in a fully welded steel case.
MX800 Transceiver General Description Power RX TX CTCSS Aux Alarm Figure 1-1 Standard Front Panel 1.1.1.2 Local Control Front Panel The Local Control Front Panel is illustrated in Figure 1-2 below.
Technical Manual General Description Microphone Socket An RJ45 socket is provided on the front panel for connection of a microphone. Channel Change Control Twin push-wheel switches can be optionally fitted to the front panel to allow selection of the operating channel. This switch replaces the channel select function normally accessible on CN3 on the rear panel. 100 channels are selectable. Refer to section 2.3.2.3 for channel select method.
MX800 Transceiver General Description 1.1.1 Rear Panel Figure 1-3 below and Table 1-2 Details the functions of each connector. Connector # Conn Type Function Description CN5 3 PIN DC Power input 13.8 Volt DC power input. Also +28 Volt input on spare pin if required. CN6 N TYPE Simplex relay out or N type RX input Location for internal simplex relay. The antenna for RX / TX connects to this point.
Technical Manual General Description 1.1.2 Side Panel The MX800 side view is illustrated in Figure 1-4 below. Two mounting holes les in each side make provision for fitting a slider rail bracket. Mounting Holes for Slide Rails Sideways Airflow Permits MX800s to be Stacked in a Rack Figure 1-4 MX800 Side Panel 1.2 Module Functional Description 1.2.
MX800 Transceiver General Description 1.2.2 Receiver Module The receiver module accepts the low level RF input signal and amplifies, filters and conditions the signal prior to detecting the wanted audio component. The Receiver module features the same advanced synthesiser and wide bandwidth as the exciter. Only the front-end Bandpass filter and VCO need to be changed in order to support different frequency bands, resulting in significant flexibility and end-user cost savings.
Technical Manual General Description 1.2.4 Micro Controller Board The Micro Controller Board is physically located behind the rear panel connectors and all signal connections (apart from the RF connections) external to the transceiver are made via the controller card. User settable jumpers and DIP switches are located on the card as are level adjustment potentiometers.
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Technical Manual 2. Installation and Operation 2.1 Installation MX800 series radios are securely packed for transport with special moulded packers within a pasteboard container. Before unpacking the MX800 radio, please inspect the packaging for signs of damage and report any damage to your MX800 distributor. Upon unpacking of the MX800 radio, please ensure that all items shipped were received, report any missing items to your MX800 distributor.
MX800 Transceiver Installation & Operation 2.2 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 & 2. This is because the Pozidriv system is the choice for high volume assembly operations. It provides self-centring system and excellent driving control with less operator fatigue.
Technical Manual Installation & Operation 2.3 Operation The MX800 can operate in local control mode via the front panel controls, stand alone repeater mode, or may be remotely controlled through the line port. Setting up the MX800 to operate in the wanted mode is straightforward and involves four main steps. 1. Using the MX800 programming utility 'MXTOOLS' to set the software configurable parameters. 2. Setting the hardware jumpers on the Micro Controller for the required options. 3.
MX800 Transceiver Installation & Operation MXTOOLS automatically polls the bussed radios to determine which addresses are active when the "Use Network" button is selected in the initial connect screen (MXTOOLS version 2.8.1 or later). Refer application note AN-MX800-002 for more details on networking, available from www.spectraeng.com.au web site. 2.3.2 Setting to Work The following sections describe the steps necessary to set the MX800 to operate as required. 2.3.2.
Technical Manual Installation & Operation JMP 10 Controls the direction of the RS232 TX and RX data. Swap 2-3 JMP 11 Controls the direction of the RS232 TX and RX data. Swap 2-3 JMP 12 Trunking RX Talk function. Disables RX VF to line and TTR VF. The function polarity or nil can be selected. Active low 1-2 JMP 13 Enables or disables the HIGH PASS FILTER for the TX audio. Enabled 1-2 JMP 14 Repeater enable. Trunking LIFULOCEN function. The function polarity or nil can be selected.
MX800 Transceiver Slave: Installation & Operation 4K7 resistor across D10. Configure at least one and no more than four MX800 in this mode when multiple units connected. Bussed mode. D10 fitted, no resistor. Configure balance of bussed units in this mode. 3-4 JMP 25 Mute defeat enable. Mute defeat cannot be used if RX TALK line is required. To use mute defeat remove JMP12 and fit JMP 25. The control signal polarity can be inverted by changing the position of JMP25.
Technical Manual 2.3.2.2 Installation & Operation Select Operating Mode The MX800 can operate in a number of different modes. The primary alternatives are full duplex, which is the default mode, repeater and simplex. Using MXTOOLS the operating mode is programmed for each channel. When a channel is selected in operation the MX800 adopts the mode programmed for that channel. The operating mode programmed in the software can be modified by the settings of DIP switch 2.
MX800 Transceiver 2.3.2.3 Installation & Operation Select Operating Channel The MX800 has a channel capacity of 255. The RF and CTCSS frequencies for each channel are programmed using MXTOOLS Channel Information screen. There are four ways of selecting the operating channel. 1. DIP Switch 8-way. DIP switch SW1 provides a binary channel selection facility. When a switch is ON it is read as a logical 1. When all switches are off the software channel select mode is enabled. 2. Rear channel select port.
Technical Manual 2.3.2.5 Installation & Operation Configure Digital I/O The MX800 has 16 digital inputs and 8 general-purpose outputs. The inputs are +5V CMOS logic compatible and are buffered by a 10K resistor in series with each input. JMP19 on the Micro-Controller selects whether these inputs are internally pulled up or internally pulled low. The active state of the input is set up through MXTOOLS. Of the 16 inputs the 8 input port B inputs are allocated to the Channel Select function.
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Technical Manual 3. Options 3.1 T01 Programmable Channel Spacing 3.1.1 Description The MX800 receiver is available in five different channel spacing options. For applications in systems that require both 12.5 kHz and 25 kHz channel spacing option T01 allows channels to be programmed for either bandwidth. Switchable IF filters in the receiver and automatic 12.5 kHz/25kHz gain compensation in the audio paths make the change in bandwidth transparent to the user.
MX800 Transceiver Options 3.2 T02 Programmable CTCSS encoder/decoder 3.2.1 Description Provision is made in the MX800 to fit a CTCSS encoder/decoder. The decoder is non-predictive and any valid CTCSS tone can be decoded. Any standard TX CTCSS tone may be associated with the programmed decode tone through the Channel Edit screen in MXTOOLS. Multiple CTCSS tones are programmable for any channel providing "Community Repeater" functionality.
Technical Manual Options 3.3 T03 Programmable DCS/CTCSS encoder/decoder 3.3.1 Description Provision is made in the MX800 to fit a full duplex DCS encoder/decoder. There are 83 digital codes available. Any standard DCS code or CTCSS tone may be assigned to any of the transmit or receive channels through the Channel screen in MXTOOLS. Multiple CTCSS tones are programmable for any channel providing "Community Repeater" functionality.
MX800 Transceiver Options 5. Install the DCS daughter board into the socket for IC25 ensuring that the daughter board has correct orientation with respect to pin numbering. 6. Install the 3x5mm screw (removed from step3) to secure the DCS daughter board. MX800 Controller Setup: 1. The DCS option is activated in the MXTOOLS ‘Configuration’ heading, within the ‘Hardware’ folder with ‘DCS Option Installed’ selected. 2.
Technical Manual Options 3.4 T05 Balanced and Isolated VF plus E&M 3.4.1 Description Standard VF connections to line are 600ohm 4-wire unbalanced. Option T05 may be fitted if transformer balanced and isolated VF inputs and outputs are required. A transformer PCB is fitted internally at the rear of the MX800. This PCB has a RJ45 connector (CN9), which protrudes through the rear panel when this option is fitted, and the balanced VF outputs are made available via this connector.
MX800 Transceiver Options Pin No Function 1 600ohm balanced RX VF leg a 2 600ohm balanced RX VF leg b 3 600ohm balanced TX VF leg a 4 600ohm balanced TX VF leg b 5 M Lead common 6 M Lead normally open 7 E Lead leg a/M lead normally closed 8 E Lead leg b Table 3-1 CN9 Connections The RJ45 pins are numbered as shown below. 1 .................. 8 Figure 3-4 CN9 RJ45 Pin-out Detail (View from Rear of MX800) Refer circuit diagram CS018-1 3.4.2 Installation Components Required: 1.
Technical Manual Options Method: 1. Remove the cover to the MX800 radio. 2. Remove the rear connector label from the back panel of the MX800. 3. Punch out the small indented rectangle on the rear LHS of the MX800. 4. Remove the connectors from the Motherboard headers SKE, SKF and SKH. 5. Carefully locate the T04 or T05 option board into position at the rear RHS of the radio with the RS232 cable lying underneath the option board. 6. Secure the option board with the qty3 3x5mm machine screws 7.
MX800 Transceiver Options 3.5 T06 Simplex Changeover Relay 3.5.1 Description For simplex applications an internally mounted coaxial changeover relay can be provided. This mounts on the rear panel and the common port protrudes through the chassis providing the simplex antenna connection.
Technical Manual Options 3.5.2 Installation Components Required: 1. Coaxial Relay Assy complete with Rx cable connected. Qty-1 2. RG58 cable Assy complete with ‘N’ Type connector fitted. Qty-1 3. 13mm hole grommet. Qty-1 4. 3x8mm pozi-drive screw. Qty-2 5. Rear Connector Label Qty-1 Test Equipment Required: 1. Communications Test Set 2. MX800 Radio Interface Box Method: 1. Remove the cover to the MX800 radio. 2. Remove the existing Receiver coaxial feeder cable assy. 3.
MX800 Transceiver Options 11. Replace the rear connector label with the label supplied. MX800 Controller Setup: 1. The MX800 RF channels that are required to be simplex should be programmed as ‘SIMPLEX’ within the channel edits screen of Mxtools and then downloaded to the MX800. 2. Switches SW2/1 and SW2/2 on the microcontroller board are switched ‘ON’ as per Section 3.6 of the MX800 Manual. MX800 Testing: 1. Connect a Communications Test Set via the RIB to the MX800. 2.
Technical Manual Options 3.6 T08 VF Delay 3.6.1 Description This option provides a 40mS delay to the received audio. When the option is fitted delayed audio is fed to the line and talkthrough paths but discriminator audio (output on CN1 Pin4) is undelayed. This option is intended for two main applications. Firstly when the delay is fitted, the mute (squelch) "crash" characteristically heard when a mobile releases its PTT but the repeater tail continues, it is eliminated.
MX800 Transceiver Options JMP Function/Description Option Active Option Disabled JMP 1 Low standby current mode switched exciter power Out In JMP 2 Low standby current mode switched receiver power Out In JMP 3 300Hz Elliptic filter 1-2 2-3 JMP 4 RX audio delay 2-3 1-2 Table 3-2 Option PCB Link Settings Refer circuit diagram CS022-1B 3.6.2 Installation Components Required: 1. Option board ‘MXOPT’ fitted for VF Delay option. Qty-1 2. 16way female-to-female IDC Cable Assy. Qty-1 3.
Technical Manual Options 5. Install the Option PCB onto the 4 standoffs with the 16way connector closest to DIP2 on the Motherboard. Secure with the qty4 3x5mm machine screws previously removed. 6. Install the 16way-ribbon cable between connector SKK on the Motherboard and SKK on the Option board, taking note that the cable is correctly orientated. 7. Check that the option board jumpers are in the following positions; 1. 2. 3. 4. JMP1 IN JMP2 IN JMP3 OFF JMP4 ON MX800 Controller Setup: 1.
MX800 Transceiver Options Note that this options PCB is also used for T08, VF Delay and T10, the Low Standby Current Mode and all three are independent and may be used separately or together. If the option PCB is ordered for one particular option it may or may not be populated for the other options.
Technical Manual Options 5. Install the Option PCB onto the 4 standoffs with the 16way connector closest to DIP2 on the Motherboard. Secure with the qty4 3x5mm machine screws previously removed. 6. Install the 16way-ribbon cable between connector SKK on the Motherboard and SKK on the Option board, taking note that the cable is correctly orientated. 7. Check that the option board jumpers are in the following positions; 1. 2. 3. 4.
MX800 Transceiver Options Approx Average Current Drain mA Condition Description Standard Standard MX800 (TX VCO on continuously) 525 Standard Standard MX800 (TX VCO switched) 490 Stage 1a Standard MX800 (TX VCO on continuously) option board fitted 475 Stage 1b Standard MX800 (TX switched) option board fitted 440 Stage 2 TX exciter inc TX VCO powered down 370 Stage 3 RX 100% duty TX exciter inc TX VCO powered down RX module power duty cycled 370 Stage 3 RX 50% duty TX exciter inc TX V
Technical Manual Options Refer circuit diagram CS022-1 3.10.2 Installation Components Required: 1. Option board ‘MXOPT’ fitted for Power Save Mode. Qty-1 2. 16way female-to-female IDC Cable Assy. Qty-1 3. 3x20mm Standoff posts. Qty-4 Test Equipment Required: 1. Communications Test Set 2. MX800 Radio Interface Box Method: 1. Remove the cover to the MX800 radio. 2. Remove the Motherboard from the MX800 radio. 3. Remove IC’s 21 and 27 from the Motherboard. 4.
MX800 Transceiver Options 2. 3. 4. JMP2 OUT JMP3 OFF (2-3) JMP4 OFF (1-2) MX800 Controller Setup: 1. The Power Save option is activated in the MXTOOLS ‘Configuration’ heading. Within the ‘Power Save Mode Settings’ folder select ‘Power Save Option Board Installed’. 2. Setup the power save mode settings as required. 3. Download the Configuration change to the MX800. MX800 Testing: 1. Connect a Communications Test Set via the RIB to the MX800. 2. Set the switches on the RIB to Line Audio and E&M. 3.
Technical Manual Options A range of reference frequencies from 1MHz to 16MHz can be used with this option. With MXTOOLS, check your exact frequency can be programmed and accepted. 3.12.2 Installation Components Required: 1. BNC to Right Angle SMB Coaxial Cable Assy. Qty-1 2. N-Type to Right Angle SMB Coaxial Cable Assy. Qty-1 3. SMB right angle PCB mounted connector. Qty-1 4. Rear connector layout label Qty-1 5. 3x8mm machine screws Qty-4 6.
MX800 Transceiver Options Method – Exciter Module: 1. Remove the cover to the exciter module. 2. Remove the exciter Printed Circuit Board from the base unit. 3. Remove the following components from the exciter board: • X1 - TCXO • R30 & R31 • TR7 4. Install and solder the right angle SMB PCB mounted connector into the CN3 position on the exciter Printed Circuit Board. 5. Re-install the exciter Printed Circuit Board onto the base unit. 6. Re-install the cover to the exciter module.
Technical Manual Options 3.11 T13 Local Speaker, Mic Socket and Front Panel Mute 3.11.1 Description For applications needing a user interface at the base station the MX800 is available with the Local Control option. The full implementation is described in section 1.1.1.2 this section describes the part fitted under option T13.
MX800 Transceiver Pin No Options Function Comment 8 PB1 5V CMOS input 7 PB2 5V CMOS input 6 Hook/monitor For quiet base 5 Mic ETH 4 Mic VF in. High or low level Set JMP22 IN for low gain dynamic Mic 3 Mic PTT. Pulled to +5V via 10K 2 +5 volts out Current limited via 220R 1 Low level muted RX VF Fixed level out. Table 3-6 MX800 Mic Socket Pinout The RJ45 pins are numbered as shown in Figure 3-4 below. 1 ..................
Technical Manual Options Test Equipment Required: 1. Communications Test Set 2. Jumper link Installation Method – MX800 Chassis: 1. Remove the cover to the MX800 radio. 2. Remove the motherboard from the chassis. 3. Remove the Exciter and receiver modules from the chassis by unscrewing the 2 M4x35mm screws on each module. 4. Remove the front panel from the chassis by unscrewing the qty4 screws securing the handles to the front panel – Do not discard the screws. 5.
MX800 Transceiver Options 8. Link the necessary links near RV9 as instructed on motherboard. 9. Install the jumper link to JMP25 (Tone to Speaker) on the motherboard. MX800 Software Controller Setup: There is no specific Controller setup required. MX800 Testing – Speaker: 1. Connect a Communications Test Set (CTS) and the necessary I/O connection to the MX800. 2. Connect Dummy load to MX800 RF out put (CN8) 3. Connect the MX800 Rx input to the RF out (or Duplex out) of the CTS. 4.
Technical Manual Options MX800 Testing – Rx Mute: 1. Connect a Communications Test Set (CTS) and the necessary MX800 I/O connection. 2. Set the test set to measure SINAD and reduce the RF generator until 8db SINAD is reached. 3. Adjust the front panel Mute control so that the RX just goes into the muted condition. Testing in now complete. 3.12 T14 Local Channel Change 3.12.1 Description For applications needing a user interface at the base station the MX800 is available with the Local Control option.
MX800 Transceiver Options Method: 1. Remove the cover to the MX800 radio. 2. Remove the motherboard from the chassis. 3. Remove the Exciter and receiver modules from the chassis by unscrewing the 2 M4x35mm screws on each module. 4. Remove the existing front panel from the chassis by unscrewing the qty4 screws securing the handles to the front panel – Do not discard the screws. 5.
Technical Manual Options 3.13 T16 1PPM Frequency Stability 12.5 kHz channels Frequency band K to X (320-950MHz) 25.0 kHz channels Frequency band R to X (805-950MHz) This option provides for 1PPM frequency stability for narrowband MX800s in the K to X bands. This frequency stability is specified from –30° C to +60° C.. 1PPM stability can additionally be used on any frequency band above 66 MHz but the DC-FM transmitter modulation feature is not fully specified below 400 MHz.
MX800 Transceiver Options 3.16 T29 Balanced and Isolated VF plus E&M 3.16.1.1 Description Option T29 provides the balanced and isolated VF I/O as well as isolated E (PTT) and M (Mute) leads, as per option T05. The option has been design to be compatible with Omitronics™ interface connections. Note Jumpers referred to in the table below are those on this option PCB.
Technical Manual Options Pin No T29 Function 5 600ohm balanced RX VF leg a 4 600ohm balanced RX VF leg b 6 600ohm balanced TX VF leg a 3 600ohm balanced TX VF leg b 7 M Lead common 8 M Lead normally open 2 E Lead leg a/M lead normally closed 1 E Lead leg b Table 3-7 T29 RJ45 Pin outs. 1 ..................
MX800 Transceiver Options 3.17 T31 Network Adapter The T31 network adapter is a small circuit board that is installed inside the MX800 transceiver to enhance serial communications to the MX800. This is achieved because the board implements a protocol especially designed for efficient multi-drop serial communications.
Technical Manual Options 3.17.2 U71 Dongle The U71 has a single DB25 male connector and four rotary switches to suit a standard MX800. Two of the switches allow the selection of a preprogrammed MX800 channel and the other two allow the selection of the standard network ID and TX RF power level 3.17.3 U72 Dongle The U72 has a single DB44 male connector and four rotary switches.
MX800 Transceiver Options 3.18 T34 Ethernet option The T34 Ethernet Option is a small circuit board that is installed inside the MX800 transceiver to allow diagnostic data from the MX800 to be sent over a UTP Ethernet link. The T34 includes a web server to output web pages for analysing the health of the host MX800 using a standard HTML web browser. The T34 board intercepts the serial data port of the MX800 and converts the MX800 data to and from IP packets that are transferred over the Ethernet link.
Technical Manual Options MX800 Transmitter Reference Frequency Option Guide Standard Stability VHF LOW (30-50MHz) VHF MID (66-88MHz) VHF HIGH (135-300MHz) UHF (300-530MHz) 20PPM 5PPM 2.5/5PPM 2.
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Technical Manual 6. MX800 Base Station Fault Finding Procedure The following test equipment may be required for the following tests: MXTOOLS (MX800 Base Station Programming Utility) RF Test Set (e.g. HP 8920 or equivalent) CRO (Cathode Ray Oscilloscope) RF Power Meter (capable of measuring to 60 Watts continuously) Multimeter +13.8V DC Power Supply (capable of supplying 15Amps) Network Analyser MX800 test jig (Optional) 6.
MX800 Transceiver Fault Finding Adjust the ‘Transmit Power’ control towards maximum looking for an increase in the RF power output level. If there is no substantial changes go to the diagnostics screen and check that the Forward power and the Reflected power levels are not abnormal. NOTE, if there is a high reflected power indication the MX800 firmware would hold the PA power low. If the Diagnostics shows abnormal, then check the voltage on pin 62 of IC1 on the Mother Board. If the voltage is low i.e.
Technical Manual Fault Finding If there were a signal present at this point then it would indicate a fault with the Mother Board audio or mute operation, go to section 6.2. 6.2 Microcontroller PCB ♦ Check fuse. If blown, replace with a 5x20 mm 3A fast blow fuse. ♦ Check all jumpers and switch settings are in the correct position for your requirements. ♦ The Microcontroller PCB requires specialised test software to check all the hardware input and output ports.
MX800 Transceiver Fault Finding 6.4 IF Section If the Receiver has low sensitivity past this point then increase the RF level to –60 dBm and check the RX DISC voltage is set to 2.50V. Adjust L14 if necessary. Connect a coax lead with a pickup loop around the end from the antenna input on the HP8920A to the case of X1. Set the HP8920 to TX test, change the Tune Mode to Manual and change the centre frequency of the comms test set to 44.545MHz for A to B Band and 89.545MHz for C Band and above.
Technical Manual Fault Finding 6.5.2 RF Power Using MXTOOLS increase the ‘Transmit Power’ control to maximum and check that the output power is greater than +24 dBm. If the Exciter power is low, check for the +8 V supply voltage at the outputs of IC2 and TR4. Use a RF probe to check for gain through IC2 and TR4. Lift R2 and solder a flying lead to the junction of R1 and R2, check the output power of the VCO is between 0 and +3dBm.
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Technical Manual 7. Appendices 7.1 MX800 Interface Connections The user connections to the MX800 are all made via the rear panel where the following connectors are located. No Conn Type Function Description CN1 DB15-F Line I/O Provides the necessary analog receiver and transmitter interface for system interfacing.
MX800 Transceiver Appendices 7.1.1 CN1 DB15 Female Line I/O Connector This connector provides the primary interface to the transceiver. Pin connection and function details are shown in Table 7-2 CN1 Connections below. Pin no Function 1 O/C ALARM OUTPUT #2. Open collector output sinks current to earth when an alarm condition occurs. The function of the alarm and the trip points as appropriate are programmable via the utility program.
Technical Manual Appendices 13 TX DC-FM INPUT OR WIDE BAND INPUT. Select the internal jumper JMP8 to configure this input as either the DC-FM input or Wide Band input. Remove jumper if not used. DC-FM input (JMP8 in position 1-2) Audio or data may be connected to this point. In order to conform to transmitter bandwidth emissions limits, this input is hard limited to the peak deviation and Bessel filtered -3dB @ 3400Hz for minimum group delay distortion. Input impedance is >10KΩ.
MX800 Transceiver Appendices 7.2 CN2 DB9 Female Monitor Connector This port provides monitor and test functions for the MX800. It may be optionally located on the front panel of the MX800. The functions of the pins are described in Table 7-3 CN2 Connections below. Pin No Function 1 EARTH. General earth common for VF input and output. 2 RX RSSI OUTPUT. The receiver's received signal strength indicator voltage is proportional to the log of the signal level at the antenna input.
Technical Manual Appendices 7.3 CN3 DB25 Female Digital I/O Connector Each CMOS logic input is protected by a 10K Ohm series resistor to the input of the logic chip. There is also a 10K Ohm pull up/down resistor at each input so as to default the input value to that set by JMP19. Each logic output is protected by a 1K-Ohm series resistor from the output of the logic chip. Pin No Function 13 DIGITAL EARTH or +5VDC output. JMP15 selectable. 25 INPUT PORT A. 8-bit Logic Input bit 0.
MX800 Transceiver Appendices Note When the front panel channel select option is fitted, input port should not be used from the external connector CN3 as it is wired to the thumbwheel switch. 7.3.1 CN4 DB9 Male RS232 Connector RS232 serial port to the MX800. It may be optionally located on the front panel of the MX800. Only 3 wires are required for the MX800 TXD, RXD and ground. The function of TXD and RXD pins can be interchanged by changing jumpers JMP10 and JMP11.
Technical Manual Appendices 7.3.3 CN7 RX Input This is a BNC connector used as the RX RF input. 7.3.4 CN8 TX Output This is an N type connector used as the TX RF power output. 7.3.5 CN9 RJ45 This connector may optionally be fitted. The function depends upon which option board is fitted. A standard option is the isolated line I/O and this connector is used for this function when this option is fitted. See Options section for connection details.
MX800 Transceiver Appendices 7.4 MX800 Specifications Minimum performance to exceed the following for 30 MHz to 960 MHz*: AS4295-1995 ETS 300 086 Jan 1991,ETS 300 113 FCC Part 90 TIA/EIA-603 BAPT 225 ZV 1/2098 (German Soft keying) CEPT T/R 24-01 E Sept 1988 EC Marking, EC EMC Directive 89/336/EEC RFS25, RFS26, RFS32 *Conforms but may not be approved. Consult Spectra Engineering regarding current type approvals and for latest and current MX800 Specification Data sheet. 7.4.
Technical Manual Appendices +/-2.5 kHz narrow band, +/- 5 kHz wide band Channel Spacing: 50kHz, 30kHz, 25kHz, 20kHz or 12.5kHz. Synthesiser Step Size: 25, 12.5,10, 7.5 or 6.25kHz. Channels: 255 Software, DIP switch and rear port selectable.199 through rear port if configured for BCD parallel selection. Table 7-7 General Specifications 7.4.3 Transmit Measured in accordance with TIA/EIA-603 standards. Parameter Specification RF Power Output: 1W to 50W variable (30-520 MHz).
MX800 Transceiver Appendices 7.4.4 Receive Measured in accordance with TIA/EIA-603 standards. Parameter Specification Sensitivity: Better than -117dBm for 12dB (25 kHz spacing), De-emphasis. Typical -120dBm Selectivity 30-50MHz: More than 90 dB for 25 kHz adj channel, More than 80 dB for 12.5 kHz adj channel. Selectivity 66-520MHz: More than 80 dB for 25 kHz adj channel, more than 75 dB for 12.5 kHz adj channel,.
Technical Manual Appendices 7.4.5 Ancillaries Parameter Specification TX Timer: Programmable, on/off selectable VF Level to Line: +6 to -15dBm, 600 ohms unbalanced or differential VF Level from Line: +6 to -15dBm, 600 ohms unbalanced, with Compressor enabled.
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 94 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
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96 SW3 SW3 X X X X X X X x X X X X X x SW8 SW1 X SW7 X 247 248 249 250 251 252 253 254 255 SW6 X X X x X X X X X X X X X SW5 X X X X X X X X X X X X X X X X X X X SW4 X X X X X X X X X X CH X X SW8 X X SW7 SW4 X X SW6 SW3 X SW5 SW2 238 239 240 241 242 243 244 245 246 Appendices SW1 CH MX800 Transceiver X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X © SPECTRA ENGINEERING 2008 Revision 4.3.
Technical Manual Appendices 7.6 MX800 Model Number Configuration Guide The MX800 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. TX Power Channel Allocation Frequency Stability E L N I M H V Z N M W D C P 1 1.0 ppm (-30 to 60°C) 2° 1.5 ppm (-10 to 60°C) & 2.5 ppm (-30 to -10°C) 4 20 ppm (-30 to 60°C) 5 2.
MX800 Transceiver Appendices 7.7 MX800 System Applications Comprehensive standard features along with a wide range of options and accessories available to it mean that the MX800 is capable of being used in many different applications. The most common of which are mentioned below together with notes where applicable on the relevant aspect of the MX800. Figure 7-2 MX800’s Setup in system rack 7.7.
Technical Manual Appendices 7.7.2 Link transceiver In the UHF bands (400 to 520 MHz) the MX800 is available in 1W and 50W. The 1W version being intended for link transceiver application. Transmit and receive audio is conveniently brought out to the D15 connector on the rear of the radio along with the mute and PTT signals.
MX800 Transceiver Appendices Other than these changes the TX alignment is as per the technical manual. 7.7.5 Trunking Base Station The MX800 is widely used as a trunking base station. A one hundred percent continuously rated transmitter is vital in the high duty cycle environment of a trunking systems. MPT 1327 control channels are permanently keyed up.
Technical Manual Appendices 7.7.9 Duplicated base station Spectra engineering has current plans for the development of an Automatic Changeover Units to facilitate duplicated base station operation. This option is not currently available. Due to ongoing development please refer to www.spectraeng.com.au for the latest information regarding this option. 7.7.
MX800 Transceiver Appendices Take care if too much offset is used as this may effect the modulation symmetry. The use of this feature and a low frequency carrier dithering has proven to eliminate the previous requirements of extremely high stability reference frequency inputs. The MX800 has been widely installed for the use in simulcast systems. These DSP based systems provide automatic compensation for changes in modulation delay characteristics.
© SPECTRA ENGINEERING 2008 Revision 4.3.
REP Two MX800 Conventional repeater Systems linked together via a RF link using MX800 REP REP DUP LINK REP DUP © SPECTRA ENGINEERING 2008 Revision 4.3.
CN1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 MX800 REAR PANEL DB15F LINE I/O RX TALK ALARM O/P # 1/M LEAD ALARM O/P # 3 RX DISCRIMINATOR RX AUDIO 5 OHMS TX VF LOOPBACK CTRL ALARM O/P # 2 RX AUDIO 600 OHMS RX MUTE/ DC FM / WB I/P PTT TX TALK EARTH TX AUDIO REPEATER ENABLE RX TALK ALARM O/P # 1/M LEAD ALARM O/P # 3 RX DISCRIMINATOR RX AUDIO 5 OHMS TX VF LOOPBACK CTRL ALARM O/P # 2 SKH © SPECTRA ENGINEERING 2008 Revision 4.3.
106 © SPECTRA ENGINEERING 2008 Revision 4.3.
© SPECTRA ENGINEERING 2008 Revision 4.3.1B Paging terminal RS232 Digital POCSAG bit stream V23 FSK tones TX only MX800 IBM Compatible Paging Encoder Modem MX800TX PTT active low 5V Cmos compatible FSK Modem MX800 RX MX800 TX 107 SC004-1A 1 0F 1 DOC No SHEET A CHECKED DATE 06/09/04 APPROVED REV DRAWN MX800 Paging Configuration Example SPECTRA ENGINEERING PTY LTD TITLE 0 to 5V POCSAG signal to DC FM input. MX800 uses repeater PTT. Repeat VF source set to Line.
108 DUP LINK This section illustrates and MX800 connected to a link transceiver. All that is required for this type of connection is a back-to-back cable between the link transceiver and the repeater transceiver REP DUP DUP LINK LINK DUP This section illustrates a MX800 repeater connected to two link transceivers. For this type of connection and audio bridge is required such as the Omnitronics type 619. Bridge REP DUP LINK DUP © SPECTRA ENGINEERING 2008 Revision 4.3.
Technical Manual 8. Superseded Technical Information 8.1 Power Amplifier Module 8.1.1 Technical Description RF from the Exciter on CN1 is first attenuated by a 50-ohm pad, which is used to provide good 50-ohm source impedance for the high power hybrid amplifier IC1. The RF is amplified to between 5 and 13 watts at the hybrid 50-ohm output. The signal from the hybrid is then matched by a broadband network to drive the low input impedance associated with the final transmit power amplifier transistor TR1.
MX800 Transceiver Superseded Technical Information frequencies. (Note that 'Continuous Update Enabled' on the MXTOOLS channel screen should be ticked for these tests) Do not connect Exciter RF drive output CN1 to PA. Procedure: 110 1. Remove PA top cover. Measure resistance of thermistor between CN46 and CN4-4, this should be approximately 2kΩ. Connect DC power lead and 10-way connector from MX800. Connect PA RF output to RF power meter and PA RF input (CN1) to RF signal generator. 2.
Technical Manual Superseded Technical Information 8.1.3 PA Fault Finding Procedure First do a visual check of all the components on the PA looking for any damaged components. Connect the input of the PA to signal generator with the RF output switched off. With PTT off measure the +13.8V supply at the collector of the output transistor. Key up the PA and check the supply voltages on the hybrid module. Refer to your circuit diagram for test points.
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Technical Manual 9. Drawings Drawing No.
MX800 Transceiver Drawings Drawing No.
