[time-nuts] WWVB BPSK Receiver Project?

[J. Forster]

Suppose the modulation is not present. The output of the phase detector
that steers the local standard ot indicator works correctly.

Now reverse the 60 kHz carrier. The phase detector works exactly thye
opposite way...  wrong.

Now alternate between 0 and 190 degrees.

The loop alternate works between exactly right and exactly wrong...  it
dithers around and the output is a measure of the ratio of 1's to 0's and
is utterly useless.

-John

============


> On Wed, 14 Mar 2012 18:14:56 -0700
> WB6BNQ <wb6bnq at cox.net> wrote:
>
>>
>> His enthusiasm was aimed totally at new products.  Although he admitted
>> it leaves all the real Timenut type people, actually
>> using the system for its intended purpose, out in the cold, he really
>> did not seem to care.  Pointing out that a failure
>> with the GPS system left WWVB as the only alternate did not seem to
>> matter either.
>
> Could someone be so kind and could explain me what the problem with
> the BPSK modulation is? I mean the phase of WWVB shifts around several
> 10us
> during sunrise/sunset already... Not to talk about the changing
> propagation
> conditions. Just see [1] for an example of what's happening.
>
> Yes, for those devices that lock on the phase, you'd have to change
> their correction/detection loop, but overall, they should still work.
>
>
> 			Attila Kinali
>
>
> [1] http://www.febo.com/time-freq/wwvb/spectracom/index.html
>
> --
> The trouble with you, Shev, is you don't say anything until you've saved
> up a whole truckload of damned heavy brick arguments and then you dump
> them all out and never look at the bleeding body mangled beneath the heap
> 		-- Tirin, The Dispossessed, U. Le Guin
>
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