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switch causes the MAN indication to appear in the display. If an automatic indication
(SHORT, MEDIUM, or LONG) is present in the display, it may be deleted by depressing
the corresponding pushbutton switch. The Receiver is now in the manual mode with the
gain control under the front panel IF GAIN control. When the Receiver is switched out of
the manual mode, it will automatically enter the SHORT AGC mode. The medium or
long
AGC
modes may be selected by depressing the corresponding pushbutton switches.
The AGC mode with a manually set threshold is enabled by depressing an AGC mode push-
button switch while in the manual mode. The MAN pushbottoIJ switch is the push-onl
push-off type. In the manual mode, the AGC pushbutton switches are push-on/push-off. .. ·
while in the automatic mode they are push-on.
3.2.8
Righthand Keypad Pushbutton Switches
a. TUNE RATE
Pro·tides for fme
(l
Hz increments), slow (30 Hz increments) and fast
(1
kHz increments)
selection of receiver operating
frequ~ncy
through rotation of the Manual Tuning Knob.
b. Numerical Frequency Digit Pushbutton Switches 0 through 9 and ENTER
These are used to set the Receiver to a particular operating frequency. Depressing the
ENTER pushbutton switch will enable the numeric keys. The first numeric key depressed
will be recognized by the Receiver
as
the ten's MHz digit. Since the Receiver cannot be
tuned above 29.999999 MHz, the Receiver will recognize only 0, I, or 2 as the first digit
entered. The second numeric key depressed will be recognized
as
the units' MHz digit
with the third numeric key depressed
as
the hundreds' kHz digit.
c .. ' . LOCK
This pushbutton switch is the push-on type. When the lock mode is activated,
as
indicated
by the word LOCK in the display, the front panel tuning knob will be disabled. The lock
mode is disabled by depressing the TUNE RATE pushbutton switch.
d. BFO, BFO CENTER
These are enabled only if the Receiver is orerated in the CW mode. Depressing the BFO will
permit selection of the BFO frequency through the front-panel tuning knob!. Depressing the
BFO CENTER will set the BFO to zero. Depressing BFO CENTER a second time will return
the BFO to the previously selected frequency.
e. LOCAL REMOTE
This push-on/push-off type pushbutton switch will set the Receiver to operate either in the
LOCAL operating condition (control of the Receiver is through front panel) or the REMOTE
operating condition. Note that the Receiver must be equipped with the optional A6AI
Remote Control Interface Circuit Card Assembly to be operated in the remote control
condition.
3.2.9
Left (Mode/Meter) Liquid Crystal Display (LCD)
a.
-1 0 0 + lOAF
o
2 4 6 8 10 1 2 RF
3-4
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