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FT-450D O
PERATION
M
ANUAL
PHONES
KEY
F
RONT
P
ANEL
B
UTTONS
AND
K
NOBS
PHONE Jack
A 3.5 mm, 3-contact jack accepts ei-
ther monaural or stereo headphones
with 2 or 3-contact plugs. When a plug
is inserted, the loudspeaker is dis-
abled.
N
OTE
:
When wearing headphones, we rec-
ommend that you turn the AF GAIN
levels down to their lowest settings
before turning power on, to minimize
the impact on your hearing caused by
audio “pops” during switch-on.
KEY Jack
This 3.5 mm, 3-contact
jack accepts a CW key or
keyer paddles (for the
built-in electronic keyer),
or output from an external
electronic keyer. Pinout is
shown below. Key up is 5
volts, and key down cur-
rent is 0.5 mA.
DSP Button
This button selects the DSP functions.
Available selections are CONTOUR,
NOTCH, DNR, and WIDTH.
IPO/ATT Button
This button selects the IPO or ATT feature. Available se-
lections are:
ATT:OFF/IPO:OFF
ATT:OFF/IPO:ON
ATT:ON/IPO:OFF
ATT:ON/IPO:ON
ATT:OFF/IPO:OFF
IPO: OFF, ATT: OFF
Attenuator is OFF, and the RF preamplifier amplifies
the incoming signal.
IPO: ON, ATT: OFF
Attenuator is OFF, and the received signal bypasses
the RF preamplifier, yielding a direct feed to the first
mixer.
IPO: OFF, ATT: ON
The received signal is reduced by 20 dB, and the RF
preamplifier amplifies the incoming signal.
IPO: ON, ATT: ON
The received signal is reduced by 20 dB, and the in-
coming signal bypasses the RF preamplifier, yielding a
direct feed to the first mixer.
The selection will be indicated in the Block Diagram on
the display.
ON/OFF Button
Press and hold in this button for one second
to turn the transceiver on or off.
NB Button
This button turns the IF Noise Blanker
on and off. Press this button to re-
duce short-duration pulse noise.
AGC Button
This button selects the AGC characteristics for the receiver.
Press and hold in this button for one second to disable the
AGC (for testing or weak-signal reception).
Do not use the plug except the 3.5-mm 3-pin type plug. If the plug in correct size is
not used the radio may be harmed or damaged.
