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 101 Maintenance
Setting a 5-Offset Carrier Frequency
If a 5-offset carrier frequency is required, set the offset using the following procedure:
(1) Connect a 50 ohm frequency counter, through a 60 dB attenuator, to the combiner’s Antenna
connector.
(2) Set the required 25 kHz channel frequency; for example, 124.500 MHz.
(3) From the AM-Voice Mode Settings Screen set the required offset (+4 kHz, -4 kHz, +8 kHz or
-8 kHz); for example, a +4 kHz offset to give an operating frequency of 124.504 MHz.
(4) From the Settings screen select Ref Freq and press the Scroll/Select switch.
(5) Key the transmitter and adjust the reference frequency using the Scroll/Select switch until the
frequency counter displays the required operating frequency; for example, 124.504 MHz.
(6) When the frequency counter displays the exact operating frequency, press the Scroll/Select
switch and stop keying the transmitter.
Disconnect the test equipment and reconnect the antenna.