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'[PIC] WWVB - Simulator program'
2009\05\22@190043 by Bob Ammerman

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Within the past week or two there has been some talk about building a WWVB
time receiver. As part of that discussion it was obvious that a source of
simulated WWVB data would be helpful. Well, I took that as a challenge. It
seemed to me that it could be done with pretty minimal hardware: in this
case just a PIC16, a crystal, a  few caps, and eight resistors.

Attached please find an implementation of a WWVB simulator, which will run
on nearly any PIC16 with 18 pins or more. It works by generating the actual
60 KHz waveforms (at 480,000 samples per second!) that WWVB itself
generates. In theory you could hook it up to a power amplifier and antenna
and be your own WWVB clone (but I wouldn't recommend that because you'd
likely have some angry neighbors and would get an unpleasant visit from the
FCC folks).

Even if you aren't interested in a WWVB simulator per se, the program uses
some neat tricks that you may find helpful when writing very time-challenged
code.

-- Bob Ammerman
RAm Systems


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2009\05\22@212104 by Vitaliy

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Bob Ammerman wrote:
> Attached please find an implementation of a WWVB simulator, which will run
> on nearly any PIC16 with 18 pins or more. It works by generating the
> actual
> 60 KHz waveforms (at 480,000 samples per second!) that WWVB itself
> generates. In theory you could hook it up to a power amplifier and antenna
> and be your own WWVB clone

This is an awesome idea for a prank!! Thanks Bob!

Vitaliy

2009\05\23@093628 by olin piclist

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Vitaliy wrote:
>> In theory you could hook it up to a power amplifier and
>> antenna and be your own WWVB clone
>
> This is an awesome idea for a prank!! Thanks Bob!

Hmm.  It might not be so funny to the other guy who shows up late to a
important event, buys a new clock because he thinks his existing one is
broken, etc.  You'd also have to be very very sure your signal doesn't get
picked up beyond the intended prank target.  Since the real WWVB signal is
very faint, I'm not really sure what power level results in what effective
radius where your signal swamps the real one.

While I like coming up with creative pranks, this is not one I'd want to
touch.  It could have some serious unintended consequences, including a
(well deserved) hefty fine and possibly jail time.  Don't go there.


********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.

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