Watkins-Johnson Company WJ-8718-19/FE Instruction Manual page 40

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2.4.3.3.6 BFO Frequency: Tuning Wheel Entry
The one-finger tuning wheel can be used to dial a BFO frequency if the
BFO and CWV switches are engaged. Selecting a tuning resolution via the TUNE
switch block to the right of the wheel disengages the LOCK switch and allows the
tuning wheel to dial a BFO frequency. The only effective tuning resolution for BFO
tuning is the 100 Hz rate in the FAST, MED and SLOW positions. Rotating the wheel
clockwise will increment the displayed frequency from a negative offset, through zero
to the upper limit of the range. Rotating the wheel counterclockwise will decrement
the displayed frequency from a positive offset, through zero, to the lowest limit of
the range.
2.4.3.3.7 BFO Frequency: Keypad Entry
The BFO offset can also be adjusted by entering the desired offset in kHz
on the general purpose keypad. When CWV detection mode is selected, the following
procedure is used to enter a BFO offset. Example 3 shows a typical BFO offset entry
for changing the offset frequency while leaving the direction, with respect to zero
offset, unchanged. Example 4 shows a typical BFO offset entry for changing the
offset frequency and direction.
o BFO Offset Frequency - Procedure
1) Press BFO +/- keypad switch.
2) Repeat step (1) if direction change is desired.
3) Enter numerical BFO offset data.
4) Terminate command by pressing kHz termination
switch.
Example 3: Change BFO offset from 1.00 kHz to 2.50 kHz
[BFO] (1) Identifies following data entry as
BFO offset data.
[2] [o] [5] (2) Data entry.
[KHZ] (3) Termination command; BFO offset
set to 2.50 kHz; "2.50" displayed in
BFO OFS/THRS LVL display
window.
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