Yaesu FT-2000 Operating Manual page 20

F P
ATT Switch
This button selects the degree of attenuation, if any, to
be applied to the receiver input.
Available selections are –6 dB, –12 dB, –18 dB, or
OFF, and the selected attenuation level appears in the
ATT column of the Receiver Configuration Indicator
on the display.
A :
The Attenuator affects
Sub (VFO-B) receivers.
The Attenuator may be used in conjunction with
the [ ] switch to provide two stages of signal
reduction when an extremely strong signal is being
received.
IPO I P
This button may be used to set the optimum front end
characteristics of the receiver circuit for a very strong-
signal environment. Available selections are AMP 1
(low distortion amplifier), AMP 2 (2-stage low-distor-
tion RF amplifier), or ON (bypasses the front end RF
amplifier), and the selected receiver RF amplifier ap-
pears at the IPO column of the Receiver Configuration
Indicator in the display.
A :
The IPO switch affects both the Main (VFO-A) and
Sub (VFO-B) receivers.
Page 18
C
the Main (VFO-A) and
O Switch
& S
R.FLT Switch
This button selects the bandwidth for the Main Band
(VFO-A) receiver's first IF Roofing Filter. Available
selections are 3 kHz, 6 kHz, 15 kHz, or Auto, and the
selected bandwidth appears in the FLT column of the
Receiver Configuration Indicator on the display.
A :
The Roofing Filter selection applies to the Main
band (VFO-A) only.
Because the roofing filter is in the first IF, the pro-
tection it provides against interference is quite sig-
nificant. When set to AUTO, the SSB bandwidth is
6 kHz, while CW is 3 kHz and FM/RTTY are 15
kHz. On a crowded SSB band, however, you may
wish to select the 3 kHz filter, for the maximum
possible interference rejection.
FT-2000 O M