User's Manual Part 1

Table Of Contents
T6T 300 Watt VHF Transmitter Page 34 Operation
Front Panel Controls and Indicators
The drive assembly front panel controls and indicators are shown in Fig 9.
Fig 9 Front Panel Controls and Indicators
Scroll/Select Switch and LCD
The Scroll/Select switch is used in conjunction with the Liquid Crystal Display (LCD) to select most of the
transmitter's operational settings. During normal operation, the LCD shows the operating frequency, the
channel number (if the channel store facility is used), the offset carrier (if used), and displays a graphical
representation of instantaneous peak power.
The example LCD screen above shows the transmitter operating on 118.000 MHz; the frequency has
been preset as channel 100 and offset at +7.3 kHz.
Ready Indicator
A green indicator that lights when the transmitter is ready for use and no BIT faults have been detected.
Transmit Indicator
An amber indicator that lights when the transmit circuit is keyed and producing output power.
Alarm Indicator
A red indicator that either flashes, or lights, when a BIT fault has been detected. BIT indications are
classified as either Alarms or Alerts.
If an ‘alert’ condition is detected, the Alarm indicator flashes, the Ready indicator remains lit, and the
transmitter remains operational. A BIT ‘alert’ is indicated if:
The transmitter RF output power has reduced from its setting by more than 1 dB but not more than
3 dB
The supply volts falls below a pre-defined level.
Any other BIT condition results in an alarm. When detected, the Alarm indicator lights and the Ready
indicator becomes unlit; the transmitter cannot be used.
READY
ALARM
TRANSMIT
STANDBY
SCROLL/
SELECT
MICROPHONE/
DIAGNOSTICS
REFERENCE
F r e q 1 1 8 .0 0 0 M H z
C h 1 0 0 + 7 . 3 k H z
P w r
Scroll/Select SwitchLCD
M o d e A M V o i c e 1