Topband: Anyone using WSPR or WSPR-X?

[Mike Waters]

You might be interested in this post, Jim: http://owenduffy.net/blog/?p=2501

"... The Signalink USB turned out to be a disappointment for several
reasons but the main one was that the noise floor was almost 20dB higher
than an ordinary $10 Creative desktop sound card. ...
"QST recently carried a modification which does improve the noise floor, in
my case by 10dB. ... The modification reduced the noise floor from -71dBfs
to -81dBfs, and although it is still high compared to a $10 creative sound
card at -89dBfs..."

I'd like to find out what Creative card that was, because I need a second
sound card in my shack PC.

73, Mike
www.w0btu.com

On Mon, Sep 1, 2014 at 2:38 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:

> On Mon,9/1/2014 12:30 PM, Larry wrote:
>
>> Be very careful about audio levels.
>>
>
> Also, use a good A/D converter to get the RX audio into your computer.
> Several good, inexpensive USB sound cards are listed on my website.
> Switching from the mic input of my laptop to these units allowed me to
> reliably decode signals 12 dB deeper into the noise on JT65.
>
> http://k9yc.com/USB_Interfaces.pdf
>
> 73, Jim K9YC
>