[time-nuts] WWVB Simulator

paul swed paulswedb at gmail.com
Wed Jan 4 14:29:43 EST 2017


Simon
Like you I tend to like hardware. But today complete micros are so cheap
and powerful they make life easy. Heck a bit to complex use 2 or 3. I like
to follow the  "Get-er-done" philosophy.

That said search the time-nuts archive for the wwvb cheatn d-psk-r. It
knows how to create the bpsk time stream aligned to wwvb then flips a BPSK
switch to remove the BPSK. This allows all of the old phase tracking
receivers work without modifications.
I used an Arduino $8 maybe and shared all of the details and software with
the group. It preserves the old AM for radios that need that modulation.
So a corrected wwvb signal can be had for cheap and it works very well here
on the east coast. As well as wwvb ever did.

Have fun and use whatever technology you like as you are the do-er, you get
to choose.

Regards
Paul
WB8TSL

On Wed, Jan 4, 2017 at 2:48 AM, Chris Albertson <albertson.chris at gmail.com>
wrote:

> You don't need to tie up a PC.    It could likely output the WWVB
> signal while it was also surfing the web and reading emails.   60KHz
> is NOTHING compared to displaying a you-tube video
>
> In fact I bet your 48MHz uP could directly synthesize the signal.
> Look at the ratio of 48 MHz / 60 KHz.  The uP can execute about 800
> instructions during one cycle of a 60 KHz courier.     Your PC can do
> a million operations during that same one cycle.
>
> But go ahead.  I'm subscribed to another list dedicated to building
> stuff with vacuum tubes.  I kind of enjoy building with that
> technology.    I used to like building with 70'd vintage 74xxx TTL.
> city is like lego blocks for big kids.   But as a practical matter if
> you just want something to work, 21st century technology gets the job
> done.
>
>
>
>
> On Tue, Jan 3, 2017 at 6:49 PM, M. Simon via time-nuts
> <time-nuts at febo.com> wrote:
> > Sure. I considered software. But I'm a hardware guy. I like designing
> boards. The rig was designed to do amplitude and phase simply. The final
> design will have a $5 48 MHz microprocessor included. I'm using that one
> because of speed and memory. When that proves out I might redesign for a $2
> 24 MHz processor. Onesies prices at Mouser
> >
> > Besides the hardware better illustrates the concepts than software. And
> I don't have to tie up a PC if I don't want to.
> >
> > I haven't priced everything out yet because the design is not done. I'd
> be surprised if the cost was over $20 in parts for everything - power
> supply not included. PCB extra.
> >
> > Feel free to send this along to the list if you are inclined.
> >
> > Simon
> >  Engineering is the art of making what you want from what you can get at
> a profit.
> > I like Polywell Fusion.
> >
> >
> >     On Tuesday, January 3, 2017 5:53 AM, Hal Murray <
> hmurray at megapathdsl.net> wrote:
> >
> >
> >
> >
> > time-nuts at febo.com said:
> >> I have come up with a ridiculously simple WWVB simulator that simulates
> both
> >> the AM modulation and the BPSK modulation.
> >
> > Did you consider software?
> >
> > Is the audio on a Raspberry Pi fast enough?
> >
> > I haven't looked at any details, but you can get ARM CPUs for ballpark
> of $5
> > on eBay.  There is a good chance that one of their IO devices will let
> you
> > send raw bits via a DMA channel.
> >
> >
> >
> > --
> > These are my opinions.  I hate spam.
> >
> >
> >
> >
> >
> >
> >
> > _______________________________________________
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>
>
> --
>
> Chris Albertson
> Redondo Beach, California
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