[time-nuts] WWVB Simulator

Vlad time at patoka.org
Wed Jan 4 17:13:05 EST 2017



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 
> <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.
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > _______________________________________________
>> > time-nuts mailing list -- time-nuts at febo.com
>> > To unsubscribe, go to https://www.febo.com/cgi-bin/
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>> > and follow the instructions there.
>> 
>> 
>> 
>> --
>> 
>> Chris Albertson
>> Redondo Beach, California
>> _______________________________________________
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>> 
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-- 
WBW,

V.P.


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