[Lowfer] How do I use Spectrum Lab as a VLF Soft Receiver ?

[rick kirby]

Hi Andy,

Im doing just that; using Spectrum Lab as a  vlf receiver.It takes some 
playing around to get it figured out. The best thing and easiest thing you 
can do is go to Lyles website :http://www.nutstreet.net/k0lr/ , and read his 
excellent article :" A Lowfer Receiver Using a Software IF. He has a few 
user setting files that you can cut and paste into the Spectrum Lab 
configuration files and it will setup automatica;ly.
 Basically if you want to listen to anything up to 24 khz ,you can use the 
SDQ1 configuration. I f , like me; you want to monitor   the 185khz watering 
hole , you ll need to build a down converter.Lyles article has one and I 
built it .It works nice with my single turn loop and pre-amp.
 I happened to have a  170 khz rock here so I used that .
  185300 hz - 170000hz = 15300 hz.Now your right in the  usable audio range 
of Spectrum Lab .
 I wont get too detailed. Ill let you read Lyles article. Ive been using 
mine about 3 weeks now.Much better than a receiver and upconverter. Much 
more stable.I have been copying  MP all day and night for last week. I even 
copied  XR Wednesday night but I had the settings too bright and it wasnt a 
nice picture to send ya.
  Good Luck !

            Rick  KA2PBO
            "PBO" 187.2Khz QRSS 60




----- Original Message ----- 
From: "Andy - KU4XR" <ku4xr at yahoo.com>
To: <lowfer at mailman.qth.net>; <rsgb_lf_group at blacksheep.org>
Sent: Friday, November 27, 2009 2:14 PM
Subject: [Lowfer] How do I use Spectrum Lab as a VLF Soft Receiver ?


> Hello All:
>
> I have recently been trying to get a soundcard VLF receiver
> going. I found a SAQ receiver on the web designed by
> Johan - SM6LKM. It works good I suppose never having tried
> this before. I can hear " Radio noise " in other words, it
> actually sounds like a receiver. When I connect enough
> coils in series, with a variable cap to ground to make a
> pre-selector, The noise floor will rise 20 dB when I tune
> the Cap. and you can see the peak move across the spectrum
> display. However, that's as far as you can go, You can't
> choose a sound card, it automatically chooses the windows
> default card, and I haven't found a way to use DSP filtering
> with it, since everything is based on the sound card alone.
>
> Now for Spectrum Lab, It has a built in " SID " receiver,
> and the built in DSP filters work in the program. I just can't
> get it to work !!!!! All I can get is low freq. hum, or
> digital noise. It makes no difference with or without an Ant.
> I've changed sound card sample rates, and FFT settings,
> nothing works for me.
>
> Does anyone have any suggestions for me to try  ?? Thank you.
>
> 73 to all :::
>
>
> Andy - KU4XR - EM75xr - Friendsville, TN.
> LOWfer Beacon " XR " @ 185.29866 KHz ( QRSS-60 )
> Coordinates:  N:  35* 43' 54" - W:  84* 3' 16"
> http://www.myspace.com/beaconxr
> http://webpages.charter.net/ku4xr/
>
>
>
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