Yaesu FT-450D Manuale Utente

Page 26

FT-450D O

PERATION

 M

ANUAL

N

OISE

 B

LANKER

 (I

NTERFERENCE

 R

EJECTION “S

IGNALS

 

WITHIN

 3 

KHZ

”

)

The FT-450D includes an effective Noise Blanker, which can significantly reduce noise caused by automotive
ignition systems.

IPO/ATT (A

DJUST

 

THE

 R

ECEIVING

 S

ENSITIVITY

)

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.

The selection will be indicated in the Block Diagram
on the display.

Block Diagram

[IPO/ATT] button

C

ONVENIENCE

 F

EATURES

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.

Block Diagram

[NB] button

N

OTE

An attenuator is always “ON” between 30kHz
and 1.7MHz.

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.