Bedienungsanleitung Yaesu FTDX1200 (Seite 63 von 140) (Englisch)

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1200 OPERATING MANUAL

AGC

(

AUTOMATIC GAIN CONTROL

)

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

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

once a certain minimum threshold of signal strength is achieved.

3ress the

[

AGC

]

button repeatedly to select the desired

receiver-recovery time constant. You will observe the

$GC status notation in the $GC column of the .ey

Function 'isplay on the TFT display, denoting the $GC

receiver-recovery time currently in use. For most opera-

tions, we recommend the “$UT2” mode. $dditionally,

you may disable the $GC by pressing and holding in the

[

AGC

]

button for one second.

OOLS

FOR

OMFORTABLE

AND

FFECTIVE

ECEPTION

[

AGC

]

Button

NOTE:



The “$UT2” selection mode selects the optimum

receiver-recovery time for the reception mode.

In this case, the selected receiver-recovery time in

the $GC column of the .ey Function 'isplay glows

green 1ormally glows blue).



3ressing the

[

AGC

]

button allows selection of the

desired receiver-recovery time constant. 1ormally,

the “$UT2” 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 F$ST. The $UT2

mode selections are

ADVICE:



If the $GC receiver-recovery time is set to “2ff” by

pressing and holding in the

[

AGC

]

button, the S-

meter will no longer deÀect. $dditionally, you will

likely encounter distortion on stronger signals, as the

IF ampli¿ers and the following stages are probably

being overloaded.

UICK POINT:

Several aspects of $GC performance may be con¿gured

via the 0enu. However, because $GC can have such a

profound impact on overall receiver performance, we

generally do not recommend any changes to the $GC

0enu selections until you are thoroughly familiar with

the performance of the

1200

TERMINOLOGY:

$utomatic Gain Control, or $GC, is a circuit that senses

the received signal strength, and then limits the gain of

the 5F and IF stages to keep the output audio volume at

a more-or-less constant level. $GC also protects the 5F,

IF, $udio, and 'S3 stages from overload, as it limits the

signal strength that is allowed to Àow, irrespective of the

input signal level.

AUTO AGC SELECTION

SLOW

FAST

MID

OPERATING MODE

LSB/USB/AM

CW/FM

RTTY/DATA

SLOPED AGC Operation

In traditional $GC systems, the audio output from the transceiver becomes essentially ¿xed once the threshold

for $GC action is reached usually several do]en dB above the no-signal noise Àoor). The

1200

, however,

includes an innovative Sloped $GC system on the 0ain band VF2-$) receiver, that allows the audio volume

to rise and fall slightly according to signal strength. $lthough the risefall slope is not dramatic, it is suf¿cient to

allow you to use your ear to discern and separate signals according to signal strength, not just audio freTuency.

Using Sloped $GC

1. 3ress the

[

]

button to engage the 0enu mode.

. 5otate the

[

VFO-B/CLAR

]

knob or press the



button) to select 0enu item “

004 AGC SLOPE

”.

3. 3ress the

[

SELECT

]

button, then rotate the

[

VFO-B/

CLAR

]

knob or press the



button) to change the

setting to “SL23(”.

4. 3ress the

[

SELECT

]

button, then press the

[

]

but-

ton to lock in the new setting and exit to normal opera-

tion.You will now be using the Sloped $GC system.

SLOPED

NORMAL

AGC start

Input Signal

Audio Output

KEY FUNCTION DISPLAY

Indicates the AGC

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