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 Superseded Technical Information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
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.
Optionally the FSK signalling of MPT systems can be injected flat into an
non pre-emphasized input and received on an non de-emphasized output
which allows the signalling to go flat to air. As a compact two RU height
enclosure the MX800 permits a high channel density for a given rack height.
LTR trunking systems make use of a digital sub audible signalling scheme.
Once again the low frequency modulation capabilities (down to DC) of
MX800 are vital in ensuring that the signalling takes place and a low bit error
rate. A marginal system will result if the Transmitter modulation response
can not go below 10Hz.
7.7.6 Systems base
Typical small systems environments. Once again the user interface presented
at the rear of the radio and the software programmable functions through
MXTOOLS give systems designers and large degree of control over the base
station.
In a system, which operates in one RF band, it is particularly convenient and
cost-effective if all base stations can be made and programmed identically.
This reduces the number of spare base stations required to maintain the
system. MX800 supports this mode of operation in as much as the operating
characteristics of up to 255 channels can be pre-programmed in all of the base
stations, and insertion of an on-site channel selector and configuration plug
selects the particular operating parameters for that base station in that
location. Spectra will introduce additional features in this area.
7.7.7 Repeater with Morse ID
A programmable built in Morse ID encoder makes it convenient to use the
MX800 as a UHF CB repeater, Amateur repeater or auto identified repeater.
7.7.8 Simplex base station
Option T06 for the MX800 is a coaxial changeover relay. In a Simplex
system with a single antenna and common transmit and receive frequencies
this can be used for connection of the transmitter and or receiver to the
antenna. Provision is made in the programming to introduce a 50ms delay on
transmit to allow the relay to changeover prior to RF ramp up.
© SPECTRA ENGINEERING 2008 Revision 4.3.1B
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