A PC can certainly generate a lot of frequencies. But if you want to use the
audio channels at 60KHz there is a little problem. There is a brick wall filter
in the audio channel set at about 25 KHz.
Now I could set up the audio to output 15 KHz I and Q and mix it (quadrature
mixer) with 45 KHz X 4 (precision source) to get 60 KHz. And then filter it to
get the 60 KHz. Which requires some op amps. And filters. A precision 45 KHz
source. A gray code counter (divide by 4). And stuff.
Easier to work at DC (my "audio" signal) and mix that up to 60 KHz directly.
Besides. I do like designing and building hardware. Engineering is the art of
making what you want from what you can get at a profit.
I like Polywell Fusion.
On Wednesday, January 4, 2017 7:48 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.
>
>
>
>
>
>
>
> _______________________________________________
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--
Chris Albertson
Redondo Beach, California
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