Yaesu FT-991 Operating Manual page 62

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 ALC meter deflection 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 [ MIC GAIN ] on the
LCD. Therefore, we recommend that you make [ MIC
GAIN ] 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.
Page 60
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oDe ransMission
 Four techniques to implement Transmit/Receive con-
trol are provided on the FT-991. You may choose
the technique(s) that best suit your operating needs:
 Pressing the microphone PTT switch will engage
the transmitter.
 The rear panel PTT jack may be connected to a
foot switch or other manual switching device in
order to engage the transmitter.
 Touching [ MOX ] on the TFT display functions
list will lock the transmitter on (The functions list
may be displayed by pressing the F(MLIST) but-
ton). Touch [ MOX ] 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 70.
FT-991 O M
peraTing anual