Att - Yaesu FTDX5000 Series Operating Manual

C
ONVENIENCE
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 ] button to insert 6, 12, or 18-dB of RF attenuation in front of the RF amplifier.
VFO-A ATT Setup
 Press the [ A ] button to activate VFO-A receiver (The
[ A ] button will glow red).
 Move the [ ATT ] knob up or down to set the desired
attenuation level of the VFO-A receiver, per the chart
below.
Attenuator is Off
OFF OFF
OFF OFF: OFF
6 dB: The incoming signal power is reduced by 6
6 dB 6 dB
–6 dB 6 dB
dB (Signal voltage reduced by 1/2)
12 dB: The incoming signal power is reduced by 12
–12 dB 12 dB 12 dB 12 dB
dB (Signal voltage reduced to 1/4)
18 dB: The incoming signal power is reduced by 18
–18 dB 18 dB 18 dB 18 dB
dB (Signal voltage reduced to 1/8)
The selected attenuation level will be indicated in the
ATT column of the Block Diagram Display.
 To quickly restore full signal strength through the At-
tenuator circuit, press the [ ATT ] knob in briefly to re-
store the ATT display to the "OFF".
[ ATT ] Knob [ A ] Button
: : : : :
A
DVICE
If background noise causes the S-meter to deflect on clear frequencies, move the [ ATT ] knob until the S-meter drops to
about "S-1". This setting optimizes the trade-offs between sensitivity, 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 moving
the [ ATT ] knob to a greater 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 maxi-
mum sensitivity, so the IPO should be disabled and the [ ATT ] knob should be set to "OFF
situation is typical during quiet times on frequencies above 21 MHz, and when using a small or negative-gain receiving
antenna on other bands.
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F
EATURES

ATT

VFO-B ATT Setup
 Press the [ B ] button to activate VFO-B receiver (The
 Move the [ ATT ] knob up or down to set the desired
 To quickly restore full signal strength through the At-
[ B ] button will glow orange).
attenuation level of the VFO-B receiver, per the chart
below.
Attenuator is Off
OFF OFF
OFF: OFF OFF
6 dB: The incoming signal power is reduced by 6
6 dB 6 dB
–6 dB 6 dB
dB (Signal voltage reduced by 1/2)
12 dB: The incoming signal power is reduced by 12
–12 dB 12 dB 12 dB 12 dB
dB (Signal voltage reduced to 1/4)
18 dB: The incoming signal power is reduced by 18
–18 dB 18 dB 18 dB 18 dB
dB (Signal voltage reduced to 1/8)
The selected attenuation level will be indicated in the
ATT column of the Block Diagram Display.
tenuator circuit, press the [ ATT ] knob in briefly to re-
store the ATT display to the "OFF".
[ ATT ] Knob [ B ] Button
OFF" by pressing the [ ATT ] knob. This
OFF OFF OFF
FT 5000 O
DX
M
PERATING ANUAL