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, depending on the current
noise level and the strength of incoming signals.
Touch [ IPO ] displayed by pressing the F(M-LIST) but-
ton repeatedly, to set the desired characteristic of the
receiver front end, according 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).
Bypasses the RF preamplifier, yielding direct
IPO:
feed to the first mixer.
The selected receiver RF preamplifier will be indicated
in the IPO column of the Key Function Display on the
TFT display.
A :
dvice
 On the 10 MHz and lower bands, it generally is 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 will result in more pleasant reception due
to reduced noise. If you can hear band noise with the
preamplifiers disengaged, then a preamplifier is gen-
erally not needed.
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r
eJeCTion
ipo ( i
p
ntercept
o
oint ptiMizAtion
F(M-LIST) Button
FT-991 O
)
M
peraTing anual