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A. Tuning Function: In addition to the main tuning knob, the ↑/+ and ↓/- keys may be
used to step- tune the receiver. Pressing ↑ once increases frequency by one step, and
pressing ↓ once decreases it. Holding either button down provides continuous tuning.
Keypad tuning is disabled by the dial lock.
B. Sign Function: The tuning keys also double as sign function keys (+ and -) when
entering Auxiliary Parameter settings via the keypad. When used for parameter entry,
the sign key must be pressed after the numeric entry. If the sign is entered first, the
receiver will interpret it as a tuning command and change operating frequency. Note that
the dial lock does not affect the sign function. Also note that the Aux function button has
to be pressed after + or - is entered.
4-9 ATTN/PREAMP button: This switch is used to step through a circular menu
providing three selections: Attenuator On, Normal, and Preamp On:
When Attn is selected, approximately 15 dB of RF attenuation is inserted into the signal
path. When Preamp is selected, approximately 10 dB of supplemental RF gain is added
to the signal path. When no LEDs are illuminated, the receiver is operating in its Normal
(or straight-through) configuration. Note that the receiver's S-meter is automatically
compensated to remain calibrated for all three settings.
4-10 MANUAL GAIN knob: The Manual Gain control is used to adjust the receiver's
IF-amplification level over a 120-dB range. As the control is adjusted, a corresponding
IF-gain level appears in the AGC area of the Auxiliary Parameter display window:
Note that this number represents gain reduction in dB below maximum. (Example: 20 =
20 dB reduction). This reading may also be interpreted as a 20-dB increase in the
receiver's AGC threshold.
4-11 REMOTE button: The Remote switch is used to activate the RS-232 control
mode. When activated, the LED will illuminate and a 'Remote Mode' message will
appear in the Memory/Scan display window:
In Local mode, all front-panel knobs and switches are active. In Remote mode, most
panel controls are locked out and operation is conducted via the remote RS-232 bus (only
the Phones and Speaker level controls plus the main power ON/OFF switch remain
active). Local operation may be restored by disengaging the Remote switch—unless the
4-4
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