Technical information

Change the other two digits in the channel number using the “cursor”
and Frequency/Channel control knob for the second “cursor” position
in the same manner. The “cursor” may now be stowed by another
push of the knob. Neither the receive nor the transmit frequencies in
the semi-duplex pairing will be displayed at this time-just the ITU
channel number.
3. Tune the antenna coupler. Press the mic button momentarily to
initiate antenna tuning. During the tuning process the TX annuncia-
tion will flash and the channel number will blank. When the TX stops
flashing and the channel number reappears, the antenna tuning cycle
is complete and you are ready to communicate on the selected ITU
channel.
NOTE: Always key the mic after selecting a new frequency to initiate
antenna tuning.
4. Transmit and receive. Before keying the mic to talk, you may
want to press the STO button momentarily. This will allow you to lis-
ten on the transmit frequency momentarily to see if another aircraft is
calling the same ground station. This way you’ll be sure not to over-
ride someone else’s transmission. Release the STO button when you
are done and transmit by keying the mic.
NOTE: British Columbia Telephone operates some public correspon-
dence stations in Canada which require the reception of a 1,000 Hz
signal from an aircraft calling the station before it will answer. The
KFS 594 is capable of sending this signal by having the pilot first key
the mic and then simultaneously press the STO button.
Operation
3-72
KHF 950/990 Pilots Guide
Rev. 0
Dec/96