[Lowfer] VLF Alphas

[Jay Hainline]

I also have the LF Engineering L-111 VLF converter box but I cant get it to 
tune accurately and it drifts like crazy. I can't recommend it. Maybe others 
have had better luck.

73 Jay

Jay Hainline KA9CFD
Colchester, IL EN40om

-----Original Message----- 
From: Douglas D. Williams
Sent: Wednesday, November 19, 2014 15:09
To: Discussion of the Lowfer (US, European, &amp,UK) and MedFer bands
Subject: Re: [Lowfer] VLF Alphas

The only thing that I use is a 50 kHz low pass filter between the output of
the DC coupler and the Mic input on my PC, but that isn't really necessary.
Of course, I wouldn't leave it connected if there were thunderstorms
anywhere near. An audio isolation transformer might work also.

The e-probe I am currently using is the Clifton Labs model, and if I
connect it as described above and unmute the mic input in the mixer
setting, I can actually hear tweaks and spherics from my computer speakers,
as if I were listening to a whistler receiver, except the low frequency
cutoff is higher, at around 5 kHz or so.

D.

On Wed, Nov 19, 2014 at 9:52 AM, Jay Hainline <ka9cfd at mtcnow.net> wrote:

> I should try that sometime. Any protection needed between the coax that
> would go to your receiver to your mic soundcard input? I am using the LF
> Engineering L-400B antenna.
>
>
> Jay Hainline KA9CFD
> Colchester, IL EN40om
>
> -----Original Message----- From: Douglas D. Williams
> Sent: Wednesday, November 19, 2014 14:41
> To: Discussion of the Lowfer (US, European, &amp,UK) and MedFer bands
> Subject: Re: [Lowfer] VLF Alphas
>
>
> Forgot to mention the maximum frequency you will be able to see will be
> half the sampling rate of your sound card. So if you have a 48 kHz sound
> card, you will be able to see up to 24 kHz on Spectrum Lab's display.
>
> D.
>
> On Wed, Nov 19, 2014 at 9:38 AM, Douglas D. Williams <kb4oer at gmail.com>
> wrote:
>
>  Tom, a cheap VLF receiver can be your computer's sound card. If you have
>> an e-probe that is sensitive at VLF, you can often connect the receiver
>> output of your DC power coupler directly to the mic or line in on your PC
>> and view the output using Spectrum Lab software (free). Spectrum Lab has
>> some included settings what have common VLF stations already marked on 
>> the
>> spectrum display.
>>
>> -Doug
>>
>> On Wed, Nov 19, 2014 at 9:32 AM, Garry Hess <k3siw at sbcglobal.net> wrote:
>>
>>  Tom, the VLF captures were made with a rooftop eprobe and sdr-iq
>>> receiver.
>>>
>>> Re: lowfer EAR: J.B., it's coming in well here too but MLS isn't even
>>> detectable despite being a bit closer.
>>> --
>>> 73, Garry, K3SIW, EN52ta, Elgin, IL
>>>
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