Convenience Features; Ipo/Att; (Adjust The Receiving Sensitivity); Noise Blanker - Yaesu FT-450D Operation Manual

C
ONVENIENCE
IPO/ATT ( A
You may reduce the receiving signal strength to 20 dB when extremely strong local signals or high noise de-
grade reception. You may optimize the characteristics of the receiver front-end, for best reception, depending on
the noise levels and the signal strengths.
Press the [ IPO/ATT ] button several times to set the
desired selection, per the chart below.
ATT: OFF, IPO: OFF Attenuator is OFF, and the incoming
signal is amplified by the RF preampli-
fier.
ATT: OFF, IPO: ON Attenuator is OFF, and the incoming
signal bypasses the RF preamplifier,
yielding direct feed to the first mixer.
ATT: ON, IPO: OFF Attenuator is ON, (the incoming signal
is reduced by 20 dB) and the incom-
ing signal is amplified by the RF pream-
plifier.
ATT: ON, IPO: ON Attenuator is ON, (the incoming signal
power is reduced by 20 dB) and the
incoming signal bypasses the RF
preamplifier, yielding direct feed to the
first mixer.
The selection will be indicated in the Block Diagram
on the display.
N B
OISE LANKER
The FT-450D includes an effective Noise Blanker, which can significantly reduce noise caused by automotive
ignition systems.
1. Press the [ NB ] button to activate the Noise
Blanker.
2. Press the [ NB ] button again to disable the Noise
Blanker.
The selection will be indicated in the Block Diagram
on the display.
Page 26
F
EATURES
R
DJUST THE ECEIVING
( I
R
NTERFERENCE
S
ENSITIVITY
[ IPO/ATT ] button
N
OTE
An attenuator is always "ON" between 30kHz
and 1.7MHz.
EJECTION "S
IGNALS WITHIN
[ NB ] button
FT-450D O
)
Block Diagram
)
3 "
KHZ
Block Diagram
M
PERATION ANUAL