Manual Yaesu FT-991 (page 59 of 154) (English)

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Page 57FT-991 OperaTing Manual

Agc

(

AutoMAtic gAin control

)

The AGC system is designed to help compensate for fading and other propagation effects. The AGC characteristics can

beindividuallysetforeachoperatingmode.ThebasicobjectiveofAGCistomaintainaconstantaudiooutputlevel

once a certain minimum threshold of signal strength is achieved.

Press the

F(M-LIST)

button, then touch

[

AGC

]

on the

LCD repeatedlytoselect the desired receiver-recovery

timeconstant.YouwillobservetheAGCstatusnotation

in the AGC column of the Key Function Display on the

TFT display, denoting the AGC receiver-recovery time

currently in use. For most operations, we recommend

the“AUTO” mode.Additionally, youmay disable the

AGCbytouching

[

AGC

]

ontheLCD.

F(M-LIST) Button

tools for coMfortable anD effective reception

note:



 The“AUTO”selectionmodeselectstheoptimum

receiver-recovery time for the reception mode.

In this case, the selected receiver-recovery time in

the AGC column of the Key Function Display glows

green(Normallyitglowsblue).



Touching

[

AGC

]

ontheLCDallowsselectionofthe

desiredreceiver-recoverytime constant.Normally,

the “AUTO”selection is satisfactory for most situ-

ations,but inthe eventof operationona crowded

bandwhereyou wishtoreceive aweaksignal,you

maywishtochangethesettingtoFAST.TheAUTO

mode selections are:

Advice:



 IftheAGCreceiver-recoverytimeissetto“Off”by

touching

[

AGC

]

on theLCD,the S-meterwillno

longerdeect.Additionally,youwilllikely encoun-

terdistortiononstrongersignals,astheIFampliers

andthefollowingstages areprobably beingover-

loaded.

quick point:

SeveralaspectsofAGCperformancemaybecongured

viatheMenu.However,becauseAGCcanhavesucha

profound impact on overall receiver performance, we

generally do not recommend any changes to the AGC

Menu selections until you are thoroughly familiar with

the performance of the

FT-991

terMinology:

Automatic Gain Control, or AGC, is a circuit that senses

the received signal strength, and then limits the gain of

theRFandIFstagestokeeptheoutputaudiovolumeat

amore-or-lessconstantlevel.AGCalsoprotectstheRF,

IF, Audio, and DSP stages from overload, as it limits the

signalstrengththatisallowedtoow,irrespectiveofthe

input signal level.

Auto Agc Selection

SLOW

FAST

MID

operAting Mode

LSB/USB/AM

CW/FM/DATA-FM

RTTY/DATA-LSB/DATA-USB

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Yaesu FT-991 Manual

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