Yaesu FT-847, Руководство по эксплуатации

Страница: 46 / 108

44
FT-847 O
PERATING
M
ANUAL
SSB T
RANSMISSION
B
ASIC
O
PERATION
•
Connect your microphone to the front panel MIC
jack.
‚
Preset the front panel controls as follows:
MODE : USB or LSB (depending on band;
use USB on 14 MHz and above)
MIC
(G
AIN
): 9 o’clock position
RF PWR : Fully clockwise
ƒ
Press the microphone’s
PTT
switch, and speak into
the microphone in a normal voice level. The “
TX
”
indicator on the display will become illuminated,
and the ALC meter will deflect according to the
peaks in your speech level. Adjust the
MIC
(G
AIN
)
control so that the ALC meter peak reading is along
(but not beyond) the right edge of the ALC range
on the meter.
„
Release the PTT switch to return to the receive
mode. You may wish to reset the TX Multimeter
back to “
PO
” via Menu #24 at this time (see previ-
ous discussion).
…
For operation at lower power levels, rotate the
RF
PWR control counter-clockwise while watching the
PO (Power Output) scale on the meter, so as to set
the desired power level.
Note : Counter-clockwise rotation of the
RF PWR
control, or operation using an antenna with
an impedance greatly different from 50
Ω
,
may result in an abnormally-high reading on
the ALC meter. Therefore, it is helpful to
make initial adjustment of the
MIC
(G
AIN
)
control while using a 50
Ω
dummy load con-
nected to the antenna jack in use; be certain
that the
RF PWR
control is fully clockwise
during such adjustments.
†
For hands-free operation when using a desk micro-
phone, such as Yaesu’s model
MD-100
A8X
, a
footswitch (which shorts two contacts together)
may be connected to the rear panel’s
PTT jack.
OPERATION