[time-nuts] New WWVB modulation format receivers (NOT)

Brian Lloyd brian at lloyd.com
Sat Feb 22 11:59:00 EST 2014



On 2/20/14, 11:08 PM, John Marvin wrote:
> I have an OpenHPSDR Hermes and it has no problem receiving WWVB;
> however, since I live in Fort Collins - Colorado, part of the success
> might just be the strong signal. I wonder if I could just stick a piece
> of wire into one of the channel inputs of a 192Khz sample rate audio
> interface (especially if it had a good low noise mic preamp) and decode
> WWVB from baseband audio!

Yes, presuming that the mic preamp doesn't cut off near 20kHz. Some do.
192kHz sampling ADCs are not all equal in their performance up there.
Just because they sample that fast doesn't mean they are flat out to the
Nyquist frequency. Just remember it is a spec game with the audio ADC
people. Sure they may sample at 192kHz but many (most?) really are no
better than those that sample at 48kHz or even those that sample at 44.1kHz.

-- 
Brian Lloyd, WB6RQN/J79BPL
706 Flightline Drive
Spring Branch, TX 78070
brian at lloyd.com
+1.916.877.5067



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