User's Manual
Table Of Contents
- 1. General Description
- 2. Installation and Operation
- 3. Options
- 3.1 T01 Programmable Channel Spacing
- 3.2 T02 Programmable CTCSS encoder/decoder
- 3.3 T03 Programmable DCS/CTCSS encoder/decoder
- 3.4 T05 Balanced and Isolated VF plus E&M
- 3.5 T06 Simplex Changeover Relay
- 3.6 T08 VF Delay
- 3.7 T09 300Hz Upgrade HPF Filter
- 3.8 T10 Power Save Mode
- 3.9 T11 Combined Options
- 3.10 T12 External Reference Oscillator Input
- 3.11 T13 Local Speaker, Mic Socket and Front Panel Mute
- 3.12 T14 Local Channel Change
- 3.13 T16 1PPM Frequency Stability
- 3.14 U69 Extended Temperature Range Verification
- 3.15 T19/26 Line Interface Board.
- 3.16 T29 Balanced and Isolated VF plus E&M
- 3.17 T31 Network Adapter
- 3.18 T34 Ethernet option
- 3.19 T36 Option - TX Ref Oscillator input and Modulator
- 6. MX800 Base Station Fault Finding Procedure
- 7. Appendices
- 7.1 MX800 Interface Connections
- 7.2 CN2 DB9 Female Monitor Connector
- 7.3 CN3 DB25 Female Digital I/O Connector
- 7.4 MX800 Specifications
- 7.5 Channel Select DIP Switch Settings
- 7.6 MX800 Model Number Configuration Guide
- 7.7 MX800 System Applications
- 7.7.1 Conventional base station/repeater
- 7.7.2 Link transceiver
- 7.7.3 Data transceiver
- 7.7.4 Paging transmitter
- 7.7.5 Trunking Base Station
- 7.7.6 Systems base
- 7.7.7 Repeater with Morse ID
- 7.7.8 Simplex base station
- 7.7.9 Duplicated base station
- 7.7.10 Power Save base station
- 7.7.11 Tone key base station
- 7.7.12 Voting base station
- 7.7.13 Simulcast base station
- 8. Superseded Technical Information
- 9. Drawings
Technical Manual General Description
© SPECTRA ENGINEERING 2008 Revision 4.3.1B
3
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.
The MX800 features a high degree of RFI and EMI screening throughout the
design and construction. The receiver and exciter (low power transmitter)
modules are contained in solid aluminium enclosures, and for additional
screening each interface pin in the modules is individually filtered. The PA
module is contained in a special compact efficient extrusion for minimum
harmonic radiation. This design results in low conducted and radiated
emissions and minimal susceptibility to RFI and EMI.
User interface is via the front and rear panels. The rear panel provides access
to all connectors and the standard front panel provides 6 LED indicators of
the radio status. The local control option front panel has additional speaker,
microphone and (optionally) channel select functions. Other variations can
accommodate serial and monitor ports, as well as VF line level adjustment on
the front panel.
1.1.1 Front Panel
1.1.1.1 Standard Front Panel
The MX800 standard front panel is illustrated below. Custom versions of the
front panel can be supplied to OEM customers.
Table 1-1 below explains the functions of the front panel LED's. Each LED
indicates the status of the MX800 in real time.
LED FUNCTION
POWER Indicates the power supply voltage is within software
selectable limits.
RX The receiver is receiving a signal or the receiver’s
squelch is open.
TX The transmitter is transmitting RF power.
CTCSS A valid Continuous Tone Coded Squelch Signal has
been detected.
AUX An Aux function is selected or the PLL is unlocked.
ALARM A prearranged alarm condition exists.
Table 1-1 LED Functions