Att - Yaesu FTDX9000MP Operation Manual

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Even with the IPO function on, extremely strong local signals or high noise can still degrade reception. In such situations,
you can use the [ ATT ] knob to insert 3, 6, 12, or 18-dB of RF attenuation in front of the RF amplifier.
MAIN(VFO-A) [ATT] Switch
SUB(VFO-B) [ATT] Switch
( VFO-A ) A
M
AIN TTENUATOR
Rotate the Main (VFO-A) side's [ ATT ] switch to set the
desired attenuation level, per the chart below.
To restore full signal strength thorugh the Attenuator cir-
cuit area, set the [ ATT ] switch to the "0" position.
( VFO-B ) A
S S
UB TTENUATOR
Rotate the Sub (VFO-B) side's [ ATT ] switch to set the
desired attenuation level, per the chart below.
To restore full signal strength thorugh the Attenuator cir-
cuit area, set the [ ATT ] switch to the "0" position.
0 dB Attenuator is Off
3 dB The incoming signal power is reduced by 3 dB (signal volt-
age reduced by 1/1.4)
6 dB The incoming signal power is reduced by 6 dB (signal volt-
age reduced by 1/2)
12 dB The incoming signal power is reduced by 12 dB (signal volt-
age reduced by 1/4)
18 dB The incoming signal power is reduced by 18 dB (signal volt-
age reduced by 1/8)
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ATT

S
ETUP
ETUP
VDD
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If background noise causes the S-meter to deflect
on clear frequencies, turn the [ ATT ] knob clock-
wise until the S-meter drops to about "S-1." This
setting optimizes the trade-offs between sensitiv-
ity, noise, and interference immunity. Also, once
you have tuned in a station you want to work, you
may want to reduce sensitivity further (or add more
attenuation) by turning the [ ATT ] knob to a more
clockwise setting. This reduces the strength of all
signals (and noise) and can make reception more
comfortable, important especially during long
QSOs.
When looking for weak signals on a quiet band,
you will want maximum sensitivity, so the IPO
should be disabled and the [ ATT ] knob should be
set to "0." This situation is typical during quiet times
on frequencies above 21 MHz, and when using a
small or negative-gain receiving antenna on other
bands.
FT 9000MP O
DX
BIAS TEMP SWR
M
PERATION ANUAL