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[linrad] Re: Volume control in filter window.
Finally after all the help, I have Linrad running as a single channel
detector. The problem here was probably all along, the setting of the
volume/level(?) control on the left side of the bandwidth window.
When I loaded and started de software the very first time I saw signal
in all three windows but no sound! I wrongly assumed all kinds of
problems basically around the back end of the sound card not getting
signal to send to the output ( speaker ) Though the instructions mention
this volume control later in the text, I overlooked this at the start
or what have you.
Also, the red bar is not visible when I start-up the software.
I am having trouble to understand exactly what this control is doing or
what its function is and have not found anything about it.
My guess is that it acts as a variable level switch to output
sound. It sounds to be discreet and not continuous.
With no signal and the bar all the way down the output is totally blocked
no sound or noise is coming from the speaker. Have not been able to
check yet how the transition from no sound to sound is happening, most
likely as a function of the desired signal level and the volume control
setting or, one effecting the other.
It appears that around the 20 scale divisions point the sound channel is
opening up and I can hear clean weak audio depending on the position of
the bfo signal though quite weak.
Again with no signal going in, when the setting of this control is
increased however, the audio output is increasing up to the point that it
starts to ring or even start to oscillate . There is then most likely a
higher noise level present that is causing the ringing.
It appears to me that this control does more than just volume control
It looks like as if it is some level detector to enable the output.
Or perhaps that the filtered signal needs to have a certain amplitude
to overcome some set level before audio is generated.
With signal, I find it relative hard to set the audio freq without
any trace of ringing, with increasing of the volume setting the ringing
level is increasing quite a lot as well as the desired signal.
Perhaps the same old problem!
73 Rein W6/PA0ZN