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Date: Mon, 25 May 2015 11:59:12 +0200
From: wolf_dl4yhf <dl4yhf@freenet.de>
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To: rsgb_lf_group@blacksheep.org
References: <AC666FAFFAF340258B396B3B6D0949A6@AGB> <8D2639CB5174D36-131C-D898@webmail-vm180.sysops.aol.com> <Pine.LNX.4.64.1505231738220.25856@plato.ucs.mun.ca>
In-Reply-To: <Pine.LNX.4.64.1505231738220.25856@plato.ucs.mun.ca>
Subject: Re: LF: Spectrum Lab & VLF
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Status: O

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: http://www.qsl.net/dl4yhf/speclab/circuits.htm#monitor

Cheers,
   Wolf DL4YHF .


Am 24.05.2015 15:01, schrieb jcraig@mun.ca:
>
> 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
>
>
>