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 Superseded Technical Information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 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.
Note that theses connections are essentially in parallel with the standard VF
connections on CN1. The VF lines on CN1 are still connected when option
T05 is fitted and care should be taken that the TX VF line is not doubly
terminated or that two VF sources are not presented to the transmitter.
Note Jumpers referred to in the table below are those on this option PCB.
The E lead is opto isolated and may be asserted by applying a DC voltage
between 5V and 48V with any polarity between CN9 Pins 7&8 (JMP1 in
position 2-3, JMP2 removed). Provision is also made to internally source the
activation voltage (+12V DC) in which case the E lead is asserted by
grounding CN9 Pin8 (JMP1 in position 1-2, JMP2 fitted.)
The M lead is relay isolated and the common and normally open contacts are
brought out via CN9. If the internal +12V DC is being used as the activation
voltage for the E lead (JMP1 in position 1-2) then the normally closed contact
is also available at CN9. The relay contacts are rated at 500mA.
Figure 3-3 MX800 Option T05 Balanced & Isolated VF I/O with E&M leads
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© SPECTRA ENGINEERING 2008 Revision 4.3.1B