[time-nuts] Homebrew WWVB TX simulator?

[paul swed]

It should not be hard.
I, like you live near Boston. So I built the carrier generator for testing
WWVB receivers.
Essentially divide ref freq to 20kc X 3 to 60 Khz.
I did not modulate it because I was trouble shooting a frequency lock
problem.
That said modulating it with the IRIGb code would be very reasonable using
my favorite pic cpu and basic.
The real challenge is running the stream and accepting a good time reference
to keep it accurate. I might guess the ole GPS might do.
By the way I built a IRIGb gen for the irig clocks I have using a basic
stamp2 3-5 years ago. Still running 24 X 7 nicely.
Regards


On Tue, Sep 14, 2010 at 5:31 PM, Randall Prentice <
randall.prentice at pscconsulting.com> wrote:

> Circuit Cellar did an article.
>
> Feburary 2010 #235 Page 38.
>
> This was a WWV simulator for a 2 part article the 2nd being a receiver.
>
> 73s
> Randall ZL2RJP
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Bob Clements
> Sent: Wednesday, 15 September 2010 9:10 a.m.
> To: time-nuts at febo.com
> Subject: [time-nuts] Homebrew WWVB TX simulator?
>
>
> Has anyone built / seen / bought a small simulator for WWVB?
>
> I live near Boston, and the WWVB signal is pretty marginal around
> here.  MSF on the same frequency isn't that far away, and local
> noise is pretty fierce.  So now and then one of my WWVB listeners
> (like my generally nice Junghans wristwatch) gets screwed up.
> The firmware writers aren't very cautious, and there's no parity
> bit in the code.
>
> So I have the itch to build a micro-power WWVB to set stuff with,
> without having to wait overnight for one or more nights.
>
> Before I dive into such a project, has anyone done/seen such
> a thing that I could buy or copy?
>
> I've got a WWV/WWVH simulator that I wrote (and announced) back
> when they were about to replace the Audichron drum machines, and
> I can start from there if necessary.  The hardware part seems
> a bit more interesting, but for this purpose I don't need to
> derive the carrier from a GPSDO or my ancient Rb oscilator.
>
> Tnx,
> /Rcc
> Bob Clements, K1BC
>
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