[time-nuts] NAA experiments as a reference

[John Reed]

I am able to phase track NAA using the following method:

Reception using active whip antenna input into HP 3581C selective vm, tuned 
to 24 KHz using its 300 Hz bandpass filter.
Output is taken from "Restored" connection on back panel and input into the 
squaring chip AD835, set up on a breadboard.  If the output of the AD835 is 
looked at with a dynamic signal analyzer, I see two monochromatic signals at 
48.1 KHz and 47.9 KHz.  I am able to phase lock on either of these using the 
Tracor 599J if they are input into it.  The lock seems to agree with the 
tracking I got with WWVB over the 15 minutes or so that I let it lock.  I 
have also looked at some of the other Navy MSK signals, but this morning 
they were too weak.  I could see hints of the monochromatic signals with NLK 
but there were too weak to lock on.

John, KA5QEP


-----Original Message----- 
From: paul swed
Sent: Saturday, September 13, 2014 6:18 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] NAA experiments as a reference

Thats what I am trying to understand. How good is good. Is it a useful
replacement for wwvb. Certainly kicks butt in signal strength.
Regards
Paul
WB8TSL

On Sat, Sep 13, 2014 at 2:03 PM, Poul-Henning Kamp <phk at phk.freebsd.dk>
wrote:

> --------
>
> The underlying NAA reference is UTC(USNO).  How close they track it
> I don't know.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by 
> incompetence.
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