User's Manual

- 9 -
If you are using the Microphone input instead of Line input, please check if
there is an
Advanced
button under the Microphone volume control in the
sound card control panel. If so, then click on it and uncheck the
+20dB gain
check box if it exists. (The extra large gain would result in overloading the
sound card and cause distortion.)
The same line must be now selected in the
Recording Control
of the sound
card control panel. To get to the Recording Control, you need to select
Options | Properties | Recording
in the top bar menu of the Volume Control
panel.
Sound Card Recording Control
The position of Volume control slider should be set to approximately half, to
get started. The same control is duplicated in the Demodulator Setup panel
(where it is labeled
Input level
).
You can adjust this level either in the sound card recording window, or,
preferably, return to the Demodulator Setup panel to take advantage of the
Clipping indicator
. The
input level
must be adjusted below the point of the
input signal clipping, i.e. just before the Clipping indicator turns red.
While adjusting the input level, you will also see the floor of the signal
spectrum shown in the main demodulator window rising proportionally.
Please pay attention to the
sound card set-up
, as most initial problems
associated with using this type of receiver can be attributed to an incorrect
sound card setting. Typical problems include: