Page 62 FT-
991
ALC meter deection may be caused by excessive
drive power, but also by reflected power detected
in the antenna system. If the antenna impedance
presented to the transceiver is other than 50 Ohms,
ALC meter action may be observed that is not re-
lated to the proper setting of
[
]
on the
LCD. Therefore, we recommend that you make
[
]
adjustments into a dummy load or antenna
system presenting impedance very close to 50 Ohms.
When making “on air” tests
(
such as setting the mi-
crophone gain
)
, be sure to listen on the frequency
before transmitting, to avoid interference to others
who may already be using the frequency.
Four techniques to implement Transmit/Receive con-
trol are provided on the
. You may choose
the technique
(
s
)
that best suit your operating needs:
Pressing the microphone
switch will engage
the transmitter.
The rear panel
jack may be connected to a
foot switch or other manual switching device in
order to engage the transmitter.
Touching
[
]
on the TFT display functions
list will lock the transmitter on
(
The functions list
may be displayed by pressing the
F
but-
ton
)
. Touch
[
]
on the LCD again to return to
receive.
The VOX
(
Voice Operated Xmit
)
circuit will
engage the transmitter automatically when you
speak into the microphone. For details of VOX
operation refer to page 72.
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