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Re: LF: Speclab

To: [email protected]
Subject: Re: LF: Speclab
From: wolf_dl4yhf <[email protected]>
Date: Fri, 08 Jul 2011 19:29:51 +0200
In-reply-to: <649889E567714A0393C8D5B0ABB27E5C@acer>
References: <53E60798FB4E4B72B9643D35B29E5746@lindavideo> <[email protected]> <[email protected]> <649889E567714A0393C8D5B0ABB27E5C@acer>
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Hello Henny,

If you turn down the gain of the 'output amplifier' in the circuit window, does the sound from the soundcard disappear (it should) ?

If not, I guess it's the old 'mixer' problem again - many soundcards are configured to route the input (from the "line in" jack) directly to the output ("line out"). SL doesn't touch any of the soundcard settings, so you need to find the right control (slider, or mute option) in the soundcard's audio volume control panel (sndvol32, or whatever program came along with the soundcard).

The effect of the hum filter should be easily audible, because that's what it was designed for. Btw for 'natural radio' listening, the FFT-based automatic multi-notch filter is preferred over the old hum filter (=comb filter).

All the best,
   Wolf DL4YHF .

P.S: If you post your question on the SL User's group, and mention the model of your soundcard, other users may be able to help.
The group's site is http://tech.groups.yahoo.com/group/SpectrumLabUsers/ .



Am 08.07.2011 14:28, schrieb henny van elst:
Hello Wolf,
 
maby you can help me out with a problem I have with Speclab.I am using speclab to listen to sferics and whistlers.In the components window I can enable the humfilter ,the effect is very clearly visible on the spectrogram,but I can,t hear the difference on the speaker.Am I forgetting something or is it just not possible on some old soundcards.It works well on my desktop...Many thank in advance,
 
73
 
 
Henny
CPM..........

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