Yaesu FT-991, Руководство по эксплуатации

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Page 49
FT-991 O
peraTing
M
anual
ssb/aM M
ode
T
ransMission
A
dvice
:

ALC meter deflection may be caused by excessive
drive power, but also by reflected power detected
in the antenna system. If the impedance presented
to the transceiver is other than 50 Ohms, ALC me-
ter action may be observed that is not related to the
proper setting of [ MIC GAIN
] on the LCD. There-
fore, we recommend that you make [ MIC GAIN
]
adjustments into a dummy load or antenna system
presenting impedance very close to 50 Ohms.

When performing “on air” tests (such as the setup of
microphone gain), be sure to check the frequency be-
fore transmitting, to avoid interference to others who
may already be using the frequency.

Four techniques for exercising Transmit/Receive
control 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
] displayed by pressing the
F(M-
LIST) button will lock the transmitter on. 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 micropho ne. For details of VOX
operation refer to page ##.