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Page 17FT
DX
1200 OPERATING MANUAL
FRONT PANEL CONTROLS & SWITCHES
PHONES Jack
$ 14-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 $F Gain levels down to their lowest settings
before turning power on, to minimi]e the impact on
your hearing caused by audio “pops” during switch-
on.
MIC Jack
This 8-pin jack accepts input from a microphone uti-
li]ing a traditional Y$(SU HF transceiver pinout.
[
ANT
]
Switch
3ressing 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 $1T jack may be enabled to use as a receive
only antenna, using the 0enu item “
033 ANT2 SET-
TING
”. See page 114.
[
IPO
]
(
INTERCEPT POINT OPTIMIZATION
)
Switch
This button may be used to set the optimum front
end characteristics of the receiver circuit for a very
strong signal environment. $vailable selections are
$03 1 low distortion amplifier), $03 -stage
low-distortion 5F amplifier), or I32 bypasses the
front end 5F amplifier). The selected receiver 5F
amplifier appears in the I32 column of the .ey
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
2FF. 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
]
(
ROOFING FILTER
)
Switch
This button selects the bandwidth of the receiver ¿rst
IF 5oo¿ng Filter. $vailable selections are 3 kH], 6
kH], 1 kH], or $uto.
The selected bandwidth appears in the 5.FLT column
of the .ey Function 'isplay on the TFT display.
A
DVICE:
The $UT2” selection mode selects the optimum
bandwidth of the 5oo¿ng ¿lter for the reception
mode. In this case, the selected bandwidth in
the 5.FLT column of the .ey Function 'isplay
glows green The unselected choices glow Blue).
Because the roofing filter is in the first IF, the
protection it provides against interference is Tuite
significant. When set to $UT2, the SSB band-
width is 6 kH], CW, 5TTY and '$T$, the band-
width is 3 kH], while $0 and F0 is 1 kH].
[
NB
]
Switch
This button turns the IF 1oise Blanker on and off.
3ress this button momentarily to reduce short-dura-
tion pulse noise.
$vailable selections are 21, 2FF, or 1BW 21. The
attenuation level appears in the 1B column of the
.ey Function 'isplay on the display.
[
AGC
]
Switch
This button selects the $GC characteristics for the
receiver. $vailable selections are F$ST, 0I', SL2W
and 2FF, or $UT2. The selected $GC characteris-
tic appears in the $GC column of the .ey Function
'isplay on the TFT display.
3ress the
[
AGC
]
button repeatedly to select the de-
sired receiver-recovery time constant. 3ress and hold
in the
[
AGC
]
button for one second to disable the
$GC for testing or weak-signal reception).
A
DVICE:
The $UT2” 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 .ey Function 'isplay,
unselected characteristics glow Blue).
The $ttenuator may be used in conjunction with
the
[
IPO
]
button to provide two stages of signal
reduction when an extremely strong signal is be-
ing received.
If the $GC receiver-recovery time is set to “2ff”
by pressing and holding in the
[
AGC
]
button, the
S-meter will no longer deÀect. $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
3ressing this button engages the 3TT 3ush to Talk)
circuit to activate the transmitter the icon in 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 3ush to Talk 3TT) switch
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 0-2hm
dummy load connected to the selected $ntenna jack.
19


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