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(4) Once RF is displayed in the mode LCD and the Receiver is under manual gain
control, the IF GAIN potentiometer may be adjusted to the desired signal level
by rotating the knob while observing the RF level indication on the meter in the
mode LCD.
k. AGC with Manual Threshold. This gain control capability allows the operator to
manually set the desired IF signal level which the AGC automatically maintains. Response
times are operator selectable through the LONG, MED or SHORT pushbutton switches
on the
lefth~d
keypad. To select AGC with manual threshold: .
"
"
(l) Select manual IF gain control as directed in j.
(2)
Set desired signal level as desired according to
j (4).
(3)
Momentarily depress and release the desired response time pushbutton switch
(LONG, MED or SHORT) on the lefthand keypad.
The Receiver is now under AGC with manual threshold control. Indications that the
Receiver is in this condition are:
(a) The word MAN is displayed under the word AGC in the mode LCD.
(b) The word LONG, MED or SHORT is displayed under the word MAN in the
mode LCD.
1.
CWo Select the CW mode by depressing and releasing the CW pushbutton switch.
Indications that the Receiver is in the CW mode are:
(a) The word CW under MODE in the mode LCD.
(b) The appearance of digits under BFO KHZ on the FREQUENCY LCD.
Select BFO (Beat Frequency Oscillator) Frequency (-8.0, 0, +8.0 kHz). The BFO may
be operated in either of two conditions:
(a) BFO - adjustable
(b) BFO CENTER - non-adjustable
NOTE
BFO functions can be controlled by the operator
only in the CW mode, and are disconnected from
their controls in all other modes.
m. The BFO condition allows the operator to tune the BFO manually to achieve the
desired audio frequency for received CW signals. The BFO CENTER condition allows
the operator to zero-beat (fine tune the Receiver to the exact RF) the incoming CW
signal. To select BFO Frequency (adjustable):
(I) Observe the BFO kHz portion of the FREQUENCY LCD. If a three digit number
and a
"+"
or" - ,. sign is displayed proceed to step 2. If a single zero preceeded
by a "
+ "
sign is displayed, momentarily depress and release the BFO CENTER
3-16
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