User's Manual

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Problem:
I can hear the audio, but it is not a pleasant sound. There is
an interfering high pitch tone.
Solution:
You need to mute the Line input in the sound card control
panel - see the panel on the next page.
(What you are probably listening to
is the intermediate frequency signal mixed with the demodulated audio
signal.)
Sound Card Volume Control Panel
Problem:
I can hear the audio and tune the receiver, but the sound is
distorted.
Solution:
Check if the
AGC
is switched on (i.e. either the Slow, Med
or Fast buttons are down – typically the Med setting is used). Check the
Input gain
in the Demodulator Setup panel: it should be set just below the
clipping level. If both settings are correct, try to reduce the sampling rate
from 48000 samples/second to 44100 (also in the Demodulator Setup).
(Some sound cards do not provide good quality sampling at 48000 sampling
rate.)