[time-nuts] Cutler NAA on 24.0kHz....

paul swed paulswedb at gmail.com
Fri Aug 15 15:24:59 EDT 2014


NAA actually is above and below 24KHz. That said I suspect that the system
simply averages the MSK out of the loop by the filter TC of the PLL.
There are numbers of propagation papers on NAA.
Paul
WB8TSL


On Fri, Aug 15, 2014 at 3:09 PM, paul swed <paulswedb at gmail.com> wrote:

> Indeed according to the tracor 900 manual you could get to -11th in 24
> hours best case. Further comment was NAA is CS as of 1976! The 900 indeed
> has a semi simple op amp adapter thing that reduces or gets rid of the MSK.
> Though I have read the description and details it makes no sense as to how
> it gets rid of the shift. (Quite curious magic)
> The manuals quite a good read at 52 pages a lot of detail. Further all of
> the unit could be built again its all simple technology or concepts adapted
> to more modern methods.
>
> The only gotcha as time nuts goes is it ain't NIST. Nor is there time and
> I don't care about time I simply want an alternate frequency reference.
> Here at Boston I can hear it in my fillings. :-) I could also hear LORAN
> C. My type of pipe.
> By the way Paul/Ziggy was also after me on NAA to consider it.
>
> I had discounted it because of the lack of info and totally unclear how to
> get rid of the FSK. MSK is FSK just with a very narrow shift. Also the
> effects of the fsk on the carrier. Hmmm glad I am typing this.
> It may be that the mark or the space is indeed exactly the true carrier
> and that op amp circuit is notching out the shifted carrier. I will bet
> thats the trick!
>
> Regards
> Paul
> WB8TSL
>
>
>
> On Tue, Aug 12, 2014 at 10:25 PM, Brian, WA1ZMS <wa1zms at att.net> wrote:
>
>> So does anyone know what frequency stability NAA has as of today?
>>
>>
>>
>> When I fire-up my VLF RX converter they are so loud I'd hate to live near
>> the site.
>>
>> One might be able to hear it with silver fillings in their teeth while
>> eating a lemon! ;- )
>>
>>
>>
>>
>>
>> -Brian, WA1ZMS
>>
>>
>>
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>



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