WiNRADiO G33DDC HF Receiver
18
Place the mouse cursor onto the upper half of the tuning knob, at which point
you will see the cursor change to a curved double ended arrow.
Hold down the right or left mouse buttons to increase or decrease the
frequency, and the knob will rotate clockwise or anti-clockwise, respectively.
If you place your cursor onto the bottom half of the tuning knob, the direction of
the rotation will reverse.
(You don’t need to move the cursor up or down to
change the rotation of the knob, simply press either the left or right mouse
button.)
The rotation increment of the tuning knob is 1 kHz. This can be changed easily
using the
Alt
,
Shift
or
Ctrl
keys: If you press the
Alt
key while tuning, the
increment will decrease ten times (to 100 Hz). Pressing
Shift
will decrease the
increment a hundred times (10 Hz). And if you use the
Ctrl
key, the increment
becomes a thousand times smaller: 1 Hz.
Another way of tuning is to use the up and down arrow keys on the PC
keyboard. The
Alt
,
Shift
and
Ctrl
keys can be used to a similar effect as with
the tuning knob, to modify the frequency increment step.
If your mouse has a wheel (as we would recommend), you can also use this;
you might find it somewhat similar to using the tuning knob of a conventional
receiver. And again, the
Alt
,
Shift
and
Ctrl
keys, when used together with the
mouse wheel, modify the tuning step accordingly.
If you press the
Shift
key while hovering with your mouse cursor over the
individual digits of the main frequency display, the display enters a different
mode and you can change the digits using the mouse wheel
– another
convenient way of quickly tuning to the frequency you want.
Achieving Best Selectivity
In any software-defined receiver, the maximum achievable selectivity is a
function of the processing power of the host computer: The greater the CPU
power, the “longer” (and therefore sharper) can the digital filters be made.
The selectivity of your receiver can be adjusted using the function
Demodulator filter length
under the top bar menu
Options
. The greater the
filter length, the better the selectivity:
