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RE: LF: Spectrum Lab & VLF

To: "[email protected]" <[email protected]>
Subject: RE: LF: Spectrum Lab & VLF
From: VIGILANT Luis Fernández <[email protected]>
Date: Tue, 26 May 2015 10:11:36 +0000
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Thread-topic: LF: Spectrum Lab & VLF
Hi All

Just about SpectrumLab. I have a question

Would like to know how to add those featured "palette versus dB" little charts 
found usually in
grabbers. At the moment I'm just using this configuration for Screen Capture
How to upload the screen captures to ftp server would be a nice help too. I 
have my grabber
running but stopped at this point. So no uploads to a web page, just Dropbox 
files updated

Hope this is useful and on topic for most of the hams here

73 de Luis

-----Mensaje original-----
De: [email protected] 
[mailto:[email protected]] En nombre de [email protected]
Enviado el: martes, 26 de mayo de 2015 0:25
Para: [email protected]
Asunto: Re: LF: Spectrum Lab & VLF

Hi Edgar, Stefan and Wolf,

Your help is muchly appreciated.  Edgar seems to have no problem switching 
between qrss60/120.  I tried Stefan's settings but still no sigs on the screen.

The monitor scope is showing a nice little green line with some random noise 
for QRSS60 and 120.

It seems the signal is getting in but being lost by the computer/sound card for 
QRSS120.  Perhaps try another computer?

73 & TNX

On Mon, 25 May 2015, wolf_dl4yhf wrote:

> Hello Joe,
> I will check the QRSS120 configuration soon, maybe I had copied the 
> settings from a computer where the input level (soundcard) was rather 
> high, and the signal in your case is much weaker.
> When turning on the "input monitor" (scope-like gadget), does it show 
> a flat green line, or a noisy-looking waveform ?
> Flat line -> not good (wasting dynamic range of the soundcard's A/D
> converter)
> Green waveform -> ok
> Red waveform -> not good (not much headroom before clipping)
> Details:
> Cheers,
>  Wolf DL4YHF .
> Am 24.05.2015 15:01, schrieb [email protected]:
>> Dear Group,
>> A QRSS60 detection at 5.2 km is the best DX for yours truly to date.
>> Although there was a detection at 7 km, this was probably via 
>> conduction from a nearby mains line. The RX is a DK7FC VLF probe and 
>> Spec Lab on a laptop.
>> The next logical step is to try QRSS120 to get past the 5.78 km boundary.
>> To my abject dismay, when doing: Quick Settings/ Slow Morse 
>> Reception(QRSS)/ Slow CW, 120 s/dot/ Enter AUDIO centre frequency 
>> (8277 entered) / OK/no; the spectrum screen scrolls across completely 
>> blank and the real time spectrum on the right shows a flat line.
>> Going back to QRSS60, all is just fine.
>> Am I or the computer malfunctioning again?
>> Many thanks
>> Joe VO1NA

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