User's Manual Part 2
Table Of Contents
- Maintenance
- Introduction
- Scheduled Maintenance
- Unscheduled Maintenance
- Introduction
- Tools, Materials and Test Equipment Required
- T6T VHF Amplifier Procedures
- Top and Bottom Covers
- Removing and Refitting the Interface Module
- Removing and Refitting the PSU Regulation Module
- Removing and Refitting the Power Supply Modules
- Removing and Refitting the Combiner BIT Module
- Removing and Refitting the PA Modules
- Removing and Refitting the Front Panel PCB
- Removing and Refitting the Cooling Fans
- T6T VHF Drive Assembly Procedures
- Removing the Top Cover
- Removing and Refitting the Processor Module
- Removing and Refitting the PSU Regulation Module
- Removing and Refitting the Drive Module
- Removing the Bottom Cover
- Removing and Refitting the PA Control Module
- Removing and Refitting the Power Supply
- Removing and Refitting the Front Panel PCB
- Virtual Front Panel (VFP)
T6T 300 Watt VHF Transmitter Page 96 Installation
Fig 28 Example: Using the Antenna Change-over Output
T6T Transmitter
6
5
Facilities
Connector
Antenna
T6T Transmitter
Facilities
Connector
Antenna
9
28 Vdc (nominal)
Control
(Main)
(Standby)
Antenna
Main/Standby
Transmit Relay
Example
This example shows the Antenna Change-over Output configured to control the antenna switching between main
and standby transmitters. The potential on Facilities connector pin 6 is switched through to pin 5 when the standby
transmitter is keyed; in this example, pin 6 is linked to ground. This energizes the Main/Standby Transmit Relay to
route the standby transmitter to the antenna.
Other Configurations
The antenna change-over output can be configured in other ways to suit the user’s requirement subject to:
❑ Pin 6 can be any potential between -60 and +60 V, ac or dc
❑ The maximum current drawn must not exceed 100 mA
❑ The output at pin 5 is configurable normally open or normally closed from the Polarities screen
❑ The internal solid state switch activates 35 ms before the start of the power ramp to allow for the antenna
relay pull-in time.
8
Solid State
Relay
Link