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 Superseded Technical Information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
3.6 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. Secondly
systems (including trunking systems) which have mixed voice and data on a
channel can delay the VF signal to line and air so that in the event that a data
stream is detected (by the data controller) the VF to line and air can be
disconnected for the duration of the data burst thus avoiding radio system
user annoyance. Internal switches in the MX800 may be used to disconnect
the audio under the control of the RX TALK line (CN1 Pin7) the sense of
which may be inverted using JMP12 on the micro controller. This option
provides quiet mute switching similar to CTCSS Reverse burst.
This option may be fitted at order placement or retro fitted subsequently. The
Option PCB assembly is fitted above the Micro controller on four hex pillars.
A 16-way ribbon connection is made from the Option PCB to SKK on the
micro controller card. The links on the Option card are set as below. Once the
delay option is fitted the "Delayed Audio Option" check box is ticked in the
MXTOOLS Configuration screen (Hardware settings tab).
Note that this options PCB is also used for T09, CTCSS Suppression Upgrade
Filter 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.
Figure 3-6MX800 T08,T09,T10 Option board complete
© SPECTRA ENGINEERING 2008 Revision 4.3.1B
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