Ipo (Intercept Point Optimization) - Yaesu FT-991 Operating Manual

i
nterference
The IPO feature allows the operator to optimize the characteristics of the receiver front end, contingent on the current
noise level and the strength of incoming signals.
Press the F(M-LIST) button to display the function
menu list. Touch the [ IPO ] function repeatedly, to set
the desired characteristic of the receiver front end, ac-
cording to the chart below.
AMP1: Amplifies the incoming signals, using a low
distortion RF preamplifier (gain: approx. 10
dB).
AMP2: Amplifies the incoming signals, using a
2-stage low-distortion RF preamplifier (total
gain: approx. 20 dB).
IPO: Bypasses the RF preamplifier, yielding direct
feed to the first mixer.
n :
ote
AMP1 does not function below the 1.8 MHz frequency
range.
The selected receiver RF preamplifier will be indicated
in the IPO column of the Key Function Display on the
TFT screen.
Displays IPO
A :
dvice
 On the 10 MHz and lower bands, it is generally not
necessary to use any preamplifier at all; selecting the
"IPO" position as described above will increase the
strong-signal-handling capability of the receiver, and
generally result in more pleasant reception due to the
reduced ambient noise level. If you can hear band
noise with the preamplifiers disengaged, then a pre-
amplifier is generally not needed.
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r
eJection
ipo ( i
p
ntercept
o
oint ptiMizAtion
F(M-LIST) Button
About 10dB
1.8 MHz ~ 56 MHz
FT-991 O
)
About 10dB
M
peraTing anual