Yaesu FT DX 1200 Operation Manual page 19

F
RONT
PHONES Jack
1 4-inch, 3-contact jack accepts either monaural or
stereo headphones with - or 3-contact plugs. When
a plug is inserted, the loudspeaker is disabled.
N :
OTE
When wearing headphones, we recommend that you
turn the F Gain levels down to their lowest settings
before turning power on, to minimi e the impact on
your hearing caused by audio "pops" during switch-
on.
MIC Jack
This 8-pin jack accepts input from a microphone uti-
li ing a traditional Y
[ ANT ] Switch
ressing this switch selects the ANT 1 or the ANT
2 connector on the rear panel, and allows convenient
antenna switching at the press of a button. The se-
lected antenna jack is indicated on the ey Function
isplay shown in the TFT isplay.
A :
DVICE
The T jack may be enabled to use as a receive
only antenna, using the
TING". See page 114.
[ IPO ] ( I
P
NTERCEPT OINT
This button may be used to
end characteristics of the receiver circuit for a very
strong signal environment. vailable selections are
1 low distortion amplifier),
low-distortion F amplifier), or I
front end F amplifier). The selected receiver
amplifier appears in the I
Function isplay on the display.
[ ATT ] Switch
This button selects the degree of attenuation, if any,
to be applied to the receiver input.
vailable selections are 6 dB, 1 dB, 18 dB, or
FF. The attenuation level appears in the TT col-
umn of the ey Function isplay on the display.
A :
DVICE
The ttenuator may be used in conjunction with the
[ IPO ] button to provide additional signal reduction
when an extremely strong signal is being received.
[ R.FLT ] ( R
F
OOFING ILTER
This button selects the bandwidth of the receiver rst
IF oo ng Filter. vailable selections are 3 kH , 6
kH , 1 kH , or uto.
The selected bandwidth appears in the .FLT column
of the ey Function isplay on the TFT display.
A :
DVICE
The " UT " selection mode selects the optimum
bandwidth of the oo ng lter for the reception
mode. In this case, the selected bandwidth in
the .FLT column of the
glows green The unselected choices glow Blue).
F T 12 00 O
DX PERATING
P
ANEL
SU HF transceiver pinout.
enu item "033 ANT2 SET-
) Switch
O
PTIMIZATION
set the optimum front
-stage
bypasses the
column of the ey
) Switch
ey Function isplay
M
ANUAL
C
ONTROLS
Because the roofing filter is in the first IF, the
protection it provides against interference is uite
significant. When set to UT , the SSB band-
width is 6 kH , CW, TTY and
width is 3 kH , while
[ NB ] Switch
This button turns the IF oise Blanker on and off.
ress this button momentarily to reduce short-dura-
tion pulse noise.
vailable selections are
attenuation level appears in the
ey Function isplay on the display.
[ AGC ] Switch
This button selects the GC characteristics for the
receiver. vailable selections are F ST,
and FF, or
tic appears in the GC column of the ey Function
isplay on the TFT display.
ress the [ AGC ] button
sired receiver-recovery time constant. ress and hold
in the [ AGC ] button for one second to disable the
GC for testing or weak-signal reception).
A :
DVICE
The " UT " selection mode selects the charac-
teristic of the GC for the reception mode. The
selected GC characteristic will glow green in
the GC column of the
unselected characteristics glow Blue).
The ttenuator may be used in conjunction with
the [ IPO ] button to provide two stages of signal
F
reduction when an extremely strong signal is be-
ing received.
If the GC receiver-recovery time is set to " ff"
by pressing and holding in the [ AGC ] button, the
S-meter will no longer de ect. dditionally, you
will likely encounter distortion on stronger sig-
nals, as the IF ampli ers and the following stages
are probably being overloaded.
[ MOX ] Switch
ressing this button engages the TT
circuit to activate the transmitter the
L indicators area illuminates and the "MOX" icon
will appear in the TFT display). It must be turned off
the icons will disappear) for reception. This button
replicates the action of the ush to Talk
on the microphone. When engaging the [ MOX ] but-
ton, or otherwise causing a transmission to be start-
ed, be certain you have either an antenna or 0- hm
dummy load connected to the selected ntenna jack.
& S
WITCHES
T , the band-
and F is 1 kH .
, FF, or BW
B column of the
UT . The selected GC characteris-
repeatedly to select the de-
ey Function
ush to Talk)
Page 17
. The
I , SL W
isplay,
icon in the
TT) switch