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AR3030 operating manual
keypad / VFO lock. Press the key a second time to deactivate keypad lock.
The receiver will always deactivate keypad/VFO lock when switched Off/On.
5-20 Volume control
The volume control is located on the front panel underneath the mode switches.
It is used to to set the required audio output through the loudspeaker or
headphone. When turned fully clockwise the volume is at maximum, when
rotated fully anti-clockwise the volume is reduced to minimum.
5-21 BFO PITCH control
This control is active only when the "[o]" indicator is displayed on the LCD.
The BFO (Beat Frequency Oscillator) allows manual reinsertion of carrier in
CW, USB, LSB and FAX modes. This forms a manual passband tuning
mechanism useful to remove unwanted interference.
To activate while in VFO mode, press [0] [mtr]. The same sequence
deactivates the BFO circuit.
In the default position (BFO Off - no "[o]" indicated), carrier reinsertion is
automatic making tuning easy and resolving SSB pleasurable.
5-22 SQL - squelch control
The squelch control is a smaller rotary control located on the front panel
underneath the volume control. This control is used to eliminate unwanted
background noise when monitoring a normally inactive frequency such as
5.680MHz international search & rescue or when memory SCAN is required.
The squelch is not usually used when listening to shortwave transmissions due
to the relatively high background noise levels. The usual setting for the control
is fully anti-clockwise.
The squelch setting is by the receiver's microprocessor to decide when to stop
during memory scan. The squelch opening / closing also controls the tape
recorder switching circuitry so a small internal "click" may be heard when the
squelch activates.
The squelch control requires
careful setting to achieve optimum
operating performance. Rotate the
control clockwise until the
background noise just disappears
(threshold), this is the most
sensitive setting of the control. In
practice the control is usually
rotated a little further clockwise
17
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