[time-nuts] NIST

[Andy Backus]

WWV HF transmissions include a 100 Hz subcarrier that gives the info in cw format.


For generating WWVB code I would suggest simply counting seconds to yield days -- the WWVB code takes the day number in the year.  Leap year is easy.  Just look up the DST start and stop.


acb


________________________________
From: time-nuts <time-nuts-bounces at lists.febo.com> on behalf of paul swed <paulswedb at gmail.com>
Sent: Sunday, August 12, 2018 1:47 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] NIST

Well if the old LF and HF signals go away I am on for yet another wwvb
project and wwv. What the heck.
Creating a AM wwvb is really pretty easy and in fact I have done that.
Can't remember what code that was.
Pretty sure it was basic on SXb2. But the good news is the old BPSK code
isn't needed so it really becomes easy.
The BPSK coder was seriously complicated. (That was the cheatin dePSKr)
So it would be GPS to WWVB code. Have to think about the DST thing. Thats
always a bit messy.

Lastly while I am at it there would be a 5 and 10 MHz wwv simulator at
least ticks and minute tone. Looked at voice and thats a bit of a mess.
They seem to just say numbers. Not sure there are modules that say time
from my bit of research.
Of course have to be careful with transmission levels.... Looks like its
time yo look up fcc part 97.

Things to ponder.
Regards
Paul
WB8TSL

On Sun, Aug 12, 2018 at 4:19 PM, Wes <wes at triconet.org> wrote:

> Yep, just like "government shutdowns" where all non-essential people stay
> home. (I always wondered why, it they are non-essential they are on the
> payroll in the first place, but what do I know, I'm just a taxpayer.)  But
> what gets shut down first are things like National Parks, which have
> immediate effect on lots of people.
>
> What are the effects on the budget of running WWV/WWVB?  The electric bill
> I would guess.  When John Q. Public's "atomic clock" stops working, they'll
> find a way to pay the bill.
>
> Wes
>
> On 8/12/2018 11:58 AM, djl wrote:
>
>> Just a word:   When budget cuts are announced, the agencies put the most
>> valued "stuff" to be cut first, such as the Washington monument, etc. This
>> is a recognized ploy. When the dust settles, all may be well. . .
>> Don
>>
>
>
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