[Milsurplus] Re: SAQ receiving...line noise elimination...

[WE0H]

I use a 1:1 transformer between the antenna and the mic input on the 
soundcard. It stops all my line noise. I believe the inductance is 5mh 
on each side. It is wound on a W mix ferrite core if I remember right.

Mike
WE0H


Brooke Clarke wrote:
> Hi:
> 
> Buried somewhere within 6 feet of me is a military manual that describes 
> the antenna used on subs to pickup VLF.  It consists of a large amount 
> of transformer laminations and a huge number of turns.
> 
> The Cubic 3030 is an excellent VLF receiver.  One of the key design 
> considerations is to block any A.C. line noise.  That's not at all 
> simple to do.  The AMRAD active whip suffers from line noise, see:
> http://www.prc68.com/I/LF-Ant.shtml
> 
> I don't see how a PC sound card can get around the line noise, let alone 
> internally generated noise.
> 
> Have Fun,
> 
> Brooke Clarke, N6GCE
> http://www.PRC68.com
> http://www.precisionclock.com
> http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam