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 Superseded Technical Information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
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. Selectable Alarm
functions are Low Fwd Power, High Refl Power, Low Supply Volts, High
Supply Volts, High PA Temp, TX Unlocked and RX Unlocked.
2 TX VF LOOP BACK. When this input is active the line TX audio path is
looped to the line RX audio output. The polarity is selectable via the internal
jumper JMP9. If this function is not required then remove jumper JMP9 or
place it in position 1&2. An internal trimmer pot RV7 sets the loop back gain /
loss level.
CTCSS O/P. This function is enabled Via JMP26. This then disable the TX
VF LOOP BACK function. The Receivers demodulated filtered RX Subtone
audio output from op-amp, Fixed level. AC coupled.
3
RECEIVER AUDIO 5Ω. Low impedance differential audio output from op-
amp.
4 RX DISCRIMINATOR. The receiver discriminator audio output is buffered,
unfiltered and DC coupled to this point. Output impedance is low.
5 O/C ALARM OUTPUT #3. Open collector output sinks current to earth when
an active condition occurs. The function of the alarm and the trip points as
appropriate are programmable via the utility program. Selectable Alarm
functions are Low Fwd Power, High Refl Power, Low Supply Volts, High
Supply Volts, High PA Temp, TX Unlocked and RX Unlocked.
6 O/C ALARM OUTPUT #1. ./M-lead. This output is configurable via
MXTOOLS as either an M-lead or a third alarm output. 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. Selectable Alarm functions are Low Fwd Power, High Refl Power,
Low Supply Volts, High Supply Volts, High PA Temp, TX Unlocked and RX
Unlocked.
7 RX TALK. This control line enables or disables RX VF to line and TTR VF.
The polarity is selectable via the internal jumper JMP12. If this function is not
required then remove jumper JMP12 or place it in position 1&2.
8 REPEATER ENABLE. On/off mode control of internal repeater function. The
polarity is selectable via the internal jumper JMP14. If this function is not
required then remove jumper JMP14 or place it in position 1&2.
9
TRANSMIT AUDIO INPUT 600Ω. Transmitter audio input to op-amps etc.
Nominal line input level is -10dBm. Can handle levels between -15dBm and
+6dBm. Unbalanced input with common return to analog Earth.
10 ANALOG EARTH. General analog earth common for VF input and output.
11 TX TALK. Enables or disables TX VF from line as well as TTR VF. The
polarity is selectable via the internal jumper JMP18. If this function is not
required then remove jumper JMP18 or place it in position 1&2.
12 TX PTT IN. (E-LEAD). The standard PTT input is active low and may be
driven from standard +5V logic outputs or open collector
© SPECTRA ENGINEERING 2008 Revision 4.3.1B
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