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Other prominent front-panel features include a manual IF-gain control and Preamp /
Attenuator switch located to the left of the main keypad (4). The receiver's signal-
strength meter and main power switch are located above the volume controls at the front
panel's top-left corner. To adjust the intensity of the front panel illumination, push and
hold the Setup button in the Memory/Scan group and turn the Memory/Scan knob.
4-3 MAIN TUNING knob: The Main Tuning knob is used to select operating
frequency over the receiver's 30-MHz range. This control operates in step-tune mode,
with ten preset tuning rates available from 1 Hz to 1 MHz per step (See section 4-5).
Selected step size is displayed continuously on the main alphanumeric display directly
above the Step selector buttons.
Rotating the Main Tuning knob changes operating frequency by the chosen step size,
with clockwise rotation increasing frequency and counterclockwise rotation decreasing it.
The Main Tuning knob is automatically disabled whenever the dial-lock function is
engaged (See section 4-4).
4-4 LOCK button: The Lock button is used to prevent accidental frequency changes.
When pressed on, the Lock LED illuminates and both the Main Tuning knob and -/+ Step
Tuning keypad functions are disabled. When toggled off, the LED goes out and normal
tuning is restored. The dial-lock feature doesn't affect the keypad's sign (±) functions,
which are used for programming BFO, PBT, and Notch parameters. Only the Main
Tuning function is disabled.
4-5 STEP ← → buttons: These switches are used to select step-tuning rate. A total of
ten tuning increments are available: 1 Hz, 10 Hz, 50 Hz, 100 Hz, 1 kHz, 5 kHz, 9 kHz, 10
kHz, 0.1 MHz, and 1 MHz. Pressing [←] decreases rate, and pressing [→] increases it.
Larger tuning increments (0.1 MHz and 1 MHz) provide rapid frequency excursions to
other portions of the HF spectrum, while smaller increments complement the operating
mode in use (AM, FM, SSB, etc).
Step rate is presented continuously on the main alphanumeric display directly above the
Step selector buttons.
Important Note: Newly entered step-rate increments do not take effect until the tuning
dial (or keypad) is activated. If you are tuned to 3.900020 MHz and increase the tuning
step from 10Hz to 100 Hz, nothing will happen until you begin to tune the radio. At this
point, the new tuning increments will become 3.900100, 3.900200, 3.900300, etc.
4-2
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