BendixKing KTR 909A - Manual (Page 7)

5
Selecting the Receiver Mode
One of three receiver modes may be selected using the Receive Mode Select
(MODE) key. The modes are Main, Both, and ADF.
Main Transmitting and Receiving on the displayed channel is enabled when
the MN annunciator is illuminated.
Both Scanning of both the Guard and Main receiver frequencies. When the
receiver detects a signal on either frequency, scanning stops on the
active channel. The annunciator associated with that frequency is
displayed. Transmitting while in the Both mode is accomplished on the
Main frequency. Scanning resumes when the active frequency becomes
idle.
ADF This is available if the ADF option was enabled during installation. When
the ADF mode is enabled and active, the MN annunciator is illuminated
and the letters AdF appear in the frequency display when preset channel
mode is active or in the channel display when manual frequency mode is
in use. The transmitter is disabled and an independent ADF receiver will
be enabled.
Transmitting
Note: Transmitting is disabled when the ADF receiver mode is selected or when
in the programming mode. Voice communications are disabled while in
the X-Mode.
For normal voice communications, the transmitter is keyed by pressing the micro-
phone PTT button or through the aircraft radio/audio control system, the TX
annunciator will be illuminated. For transmitting digital data, refer to the X-Mode
section.
A transmitter test is available that modulates the carrier with a 1kHz tone. This is
activated by pressing and holding the PUSH TONE button. When this button is
pressed, the TX annunciator will be illuminated.
Entering a Manual Frequency
The CHAN button is used to switch the radio between manual and preset channel
selection. When a frequency is selected manually, the receive and transmit fre-
quencies are the same. To enter a frequency manually, perform the following
steps:
• Momentarily press the CHAN button to select the Manual Frequency
Mode (top display line is blank).
• Rotate the small Frequency/Channel Select Knob to change the
frequency in 25 kHz steps. Clockwise rotations increase while counter-
clockwise rotations decrease the displayed frequency.
• Rotate the large Frequency/Channel Select Knob to change the
frequency in 1 MHz steps. Clockwise rotations increase while counter-
clockwise rotations decrease the displayed frequency.