[time-nuts] WWVB Simulator

[David]

Not all PC audio hardware includes such a low high frequency cutoff.

http://www.clarisonus.com/Research%20Reports/RR001-SoundCardEval/RR001-PCsoundCards.html

Based on the above review, the following cards which are still
available have a response that extends significantly above 60kHz:

http://www.m-audio.com/products/view/audiophile-192
http://www.lynxstudio.com/product_detail.asp?i=11
http://www.lynxstudio.com/product_detail.asp?i=12

On Wed, 4 Jan 2017 21:21:22 +0000 (UTC), you wrote:

>A PC can certainly generate a lot of frequencies. But if you want to use the audio channels at 60KHz there is a little problem. There is a brick wall filter in the audio channel set at about 25 KHz. 
>
>Now I could set up the audio to output 15 KHz I and Q and mix it (quadrature mixer) with 45 KHz X 4 (precision source)  to get 60 KHz. And then filter it to get the 60 KHz. Which requires some op amps. And filters. A precision 45 KHz source. A gray code counter (divide by 4).  And stuff. 
>
>Easier to work at DC (my "audio" signal) and mix that up to 60 KHz directly. Besides. I do like designing and building hardware.  Engineering is the art of making what you want from what you can get at a profit. 
>I like Polywell Fusion.