[time-nuts] WWVB: measuring local 60 KHz noise

Bob kb8tq kb8tq at n1k.org
Sat May 5 18:36:56 EDT 2018


Hi

The sample rate on a sound card is not always a good indication of it’s 
performance. Some 192 KS/s cards have cutoff’s below 50 KHz. Others
have a noise spectrum that rises quite a bit past 30 or 40 KHz. 

Lots to dig into ….

Bob

> On May 5, 2018, at 5:42 PM, Alberto di Bene <dibene at usa.net> wrote:
> 
> If you have a sound card capable of sampling at 192 kS/s, you don't need an SDR
> to receive a signal at 60 kHz... just connect the output of an active antenna, like
> e.g. the mini-whip, directly to the Line-In of the sound card, then use, for example,
> HDSDR as software, setting the sampling frequency of the sound card to 192 kS/s,
> the LO to zero, and the TUNE to 60 kHz.
> 
> I used this method in the past to successfully receive the SAQ transmission at 17.2 kHz
> Look here :
> 
> http://www.sdradio.eu/SAQ_2009_12_24.html
> 
> 73  Alberto  I2PHD
> 
> 
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