Yaesu FT-991 User Manual

Page 46 FT-991 OperaTing Manual
ipo
(
intercept point optiMizAtion
)
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
:Ampliestheincomingsignals,usingalow
distortionRF preamplier(gain: approx.10
dB).
AMP2
: Amplifies the incoming signals, using a
2-stagelow-distortionRFpreamplier(total
gain:approx.20dB).
IPO
: BypassestheRFpreamplier,yieldingdirect
feedtotherstmixer.
note:
AMP1doesnotfunctionbelowthe1.8MHzfrequency
range.
TheselectedreceiverRF preamplierwillbeindicated
in the IPO column of the Key Function Display on the
TFT screen.
F(M-LIST) Button
Displays IPO
Advice:

 Onthe10MHzandlowerbands,itisgenerallynot
necessarytouseanypreamplier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preampliersdisengaged,thenapre-
amplierisgenerallynotneeded.
interference reJection
1.8 MHz ~ 56 MHz
About 10dB About 10dB

Yaesu FT-991 Specifications

General

Brand	Yaesu
Model	FT-991
Category	Transceiver
Language	English