Here is some nice work which was done for DCF77, Its not the same as
WWVB, but worth to have a look how it was done.
http://endorphino.de/projects/electronics/timemanipulator/index_en.html
On 2017-01-04 14:29, paul swed wrote:
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
<[email protected]>
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
<[email protected]> 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 <
[email protected]> wrote:
>
>
>
>
> [email protected] 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.
>
>
>
>
>
>
>
> _______________________________________________
> time-nuts mailing list -- [email protected]
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> and follow the instructions there.
--
Chris Albertson
Redondo Beach, California
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--
WBW,
V.P.
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