[time-nuts] VLF time is not dead :-)
Alberto di Bene
dibene at usa.net
Mon Oct 18 17:14:15 EDT 2004
Poul-Henning Kamp wrote:
The fundamental clock is the sampling clock from the A/D card, which
is from a free-running PRS10 Rb.
A quadrature NCO is really easy to do in software, you figure out
the angle for each sample interval:
[...]
Thanks for the explanations. I was sure you had used a high stability
reference, but was
unsure of which one. I have played as well with the concept of a
Software Defined Radio,
but, hardware-wise, my project is much less sophisticated than yours.
I just make use of
the left and right channels of a sound card to digitize the I and Q
signals from a a quadrature
mixer. Then the software does the final quadrature conversion to
baseband, bandpass filtering,
denoising and demodulation. You can see my software here :
[1]http://www.weaksignals.com
Click on SDRADIO on the left column.
73 Alberto I2PHD
References
1. http://www.weaksignals.com/
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