[time-nuts] NAA experiments as a reference
paulswedb at gmail.com
Sat Sep 13 22:13:31 EDT 2014
Well it doesn't make any sense but by using a LO of + or-150hz I do get a
stable signal that at least allows me to get a sense of the stability of
the carrier. I am not using the tracor d-msk-r to see this. In fact I need
to relook at it may have an issue it does not seem to be doubling.
A big change I made is to use a Krohn Hite 5910c arb gen that actually has
an amazing stability all by itself. Have never had a manual for it. Though
I see the b exists. Its set to 100 hz and putting out a nice clean sine
So the math is still nuts.
Re-read the tracor documentation and they injected the LO 100 Hz low. So 24
Khz needs a LO of 23.9 Khz. The d-mask-r did not require any change to this
If NAA is transmitting 200 baud then I would expect the MSK carrier to be
+/- 100 Hz. Not +/-50 Hz.
On Sat, Sep 13, 2014 at 7:18 PM, paul swed <paulswedb at gmail.com> wrote:
> Thats what I am trying to understand. How good is good. Is it a useful
> replacement for wwvb. Certainly kicks butt in signal strength.
> On Sat, Sep 13, 2014 at 2:03 PM, Poul-Henning Kamp <phk at phk.freebsd.dk>
>> 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
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