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NOTE
If a full complement of fllters (7) has been installed and a no-number
bandwidth appears, re-initialize the Receiver. If the condition per-
sists, refer to Section V of this manual. If less than a full complement
of fllters (less than 7) has been installed, the no-number condition on
one or more bandwidths is normal and should be disregarded except
to ensure that, for operating, a bandwidth with a number
displaye~
must be selected.·
.
(3) Select Gain Control (AGC, MAN, SHORT, MED, LONG). There are
thre~
choices
.
for IF
Gain
Control:
(a) Automatic (AGC)
(b) Manual
(c) Automatic with Manual Threshold
A discussion of these choices follows.
i.
Automatic (AGC).
AGC automatically establishes and maintains a desirable IF signal.
level. Through the use of operator selectable response times, it also establishes the time
it takes for the AGe circuitry to respond to IF signal level changes. To select AGC:
(1) Observe the mode LCD under the word AGe. If the word MAN is displayed,
momentarily press and release the MAN pushbutton switch on the lefthand keypad.
the word MAN should disappear. In addition, another word (LONG, MED, or
SHORT) should be displayed under AGC on the display.
(2) Select the response time by depressing and releasing the desired pushbutton switch
(LONG. MED, or SHORn on the lefthand keypad. The Receiver is now under
automatic gain control.
j.' Manual. . Manual gain control allows the operator to set a desired IF signal level, and
disables the automatic response and adjustments to changes in IF signal level. To select
manual gain control:
.
.
(I) If the word MAN is not present under the word AGC on the Mode LCD, momentarily
depress and release the MAN pushbutton switch on the lefthand keypad. The word
MAi'1 will appear on the display.
(2) If under the word MAN another word (LONG, MED, or SHORn is present, momen-
tarily depress and release the pushbutton switch on the lefthand keypad which
corresponds to the displayed word. Once the word MAN is the only displayed word
under AGC on the mode LCD, the Receiver is under manual gain control.
(3)
Observe the level meter display in the upper left corner of the Mode LCD. If the
word RF is displayed proceed to (4). If the word AF is displayed. momentarily
depress and release the METER RF/AF pushbuttons switch on the lefthand keypad
to change the display to RF.
3-15
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