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pushbutton switch on the righthand keypad.
This
should cause the display to show
a three digit number preceeded by either a .,
+ "
or " - " sign.
(2) Observe the mode LCD and note the display under the word TUNING. If the word
BFO is displayed, proceed to step 3. If there is no word displayed under tuning, or
if SLOW, FAST, or LOCK is displayed, momentarily depress and theI.l release the
BFO pushbutton switch on the righthand keypad. The word BFO should now be
displayed under the word TUNING on the mode LCD . .
.
.
(3) Rotate' the manual tuning knob while observing the BFO KHZ portion of the FRE-
QUENCY LCD. The numbers displayed should change as the knob is rotated.
(4) Select the desired BFO Frequency (+8.0 kHz to -8.0 kHz) .either by watching the
BFO KHZ display while rotating the knob until the desired BFO Frequency is
attained, or by listening to the audio signal while rotating the knob until the desired
audio frequency is heard.
n. To select BFO CENTER (forzera-beating the incoming signal):
(1) Observe the BFO KHZ portion of the frequency LCD. If a single zero preceeded
by a "
+ "
sign is displayed, proceed to step (2). If a three digit number preceeded
by a "
+ "
sign is displayed, momentarily press and then release the BFO CENTER
pushbutton switch on the righthand keypad. A single zero preceeded by a
"+"
sign should now be displayed.
(2) Observe the mode LCD and look under the word TUNING. If there is no word dis-
played under TUNING or if SLOW or FAST are displayed, proceed to step (3).
If either the word LOCK or the word BFO is displayed, momentarily depress and
then release the TUNE RATE pushbutton switch on the righthand keypad. The
word LOCK or BFO should disappear.
(3)
The incoming signal may now be fine-tuned by slowly rotating the manual tuning
knob until the audio tone from the signal is nulled:
(4)
Momentarily depress and then release the BFO CENTER pushbutton switch and
observe that a three digit number preceededby aU
+ "
or" - " sign appears in the
BFO KHZ ·portion of the FREQUENCY LCD.
(5)
Momentarily depress and then release the BFO pushbutton switch on the righthand
keypad. The word BFO should appear in the mode LCD.
(6) Slowly rotate the manual tuning knob until the desired BFO Frequency is obtained.
(7) Momentarily depress and then release the LOCK pushbutton switch on the righthand
keypad. This disables both the manual tuning and BFO adjustment functions
preventing loss of the signal if the manual tuning knob is inadvertently rotat.ed.
(8)
Select IF bandwidth as outlined in h.
(::!).
(9)
Select gain control as outlined in h. (3).
3-17
' -
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