[ntp:questions] Re: WWVB 60kHz Receiver
jonathan at uk.me.buzzard
Mon Apr 24 19:26:29 UTC 2006
On Fri, 21 Apr 2006 21:11:07 +0000, David L. Mills wrote:
> I've been down the fancy decoding path myself, e.g., the WWV driver,
> which is a theoretically optimum linear receiver. However, much of the
> crud found at WWVB and DCF77 frequencies is bursty, which is what my
> LORAN-C receiver and program is good for. The Spectracom receiver is
> actually quite good: however, it was designed to cope with Gaussian
> noise, not suffer a 20-dB clobber by an interfering buzzsaw signal.
> My precerred approach, should I accept the assignement, would be to tap
> onto the I and Q baseband signals in the radio, chop at something like
> 10 kHz and feed to the L and R inputs on a sound card. I can take it
> from there. My problemis that the SNR has become so degraded that the
> very good PLL in the radio doesn't lock up.
But that requires a much more expensive receiver than a little OEM board
with short ferrite rod. So my algorithm is designed to work with what I
have which is just level transitions and times there of.
Jonathan A. Buzzard Email: jonathan (at) buzzard.me.uk
Northumberland, United Kingdom. Tel: +44 1661-832195
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