[time-nuts] WWVB Measurements

paul swed paulswedb at gmail.com
Sun Mar 27 01:47:15 UTC 2011


Interesting thread and welcome to time-nuts.

Well I suppose since LORAN C has been shut down and I have to say not having
a lot of luck with LORAN from Europe I have dusted off the ole WWVB
receivers. Actually they have been a live a long time. Just spoiled by LORAN
and GPS..
My actual interest is a Tracor 599 and I do have 2 X HP 117s and a loop
antenna with preamp about 140' from the house.

A couple of things I am thinking about. Considering many on time-nuts have
very accurate rubidium or better references or GPS trained Oscillators I was
going to look at the propagation changes from a semi stable reference
perspective since the local references are quite stable over time.

Measuring over time would indeed give you an idea about the strange and
wacky 60 KHZ propagation beyond diurnal shift.

Ultimately could better information be obtained over significant time so
that you might have an alternate to GPS. There are articles that were
published in the 60s by HP and others that describe what might be expected.
I am just thinking we have a lot of additional technology, methods and tools
that they did not have. Like laptops that can remember 100s of days worth of
data and process the heck out of it. Not that you need that much.

So I have to troubleshoot an oddity in the 599. John, its loosing lock. Is
it broken, is it propagation.... Tough to say. After all its 70s vintage
could be cranky caps or even handfuls of transistors.By the way I did build
a 60 KHZ xmitter and by golly it does stay locked very nicely. That still
doesn't mean somethings not broken.

Also I need to build a 60 KC breakout/buffer box so that all three rcvrs can
operate at the same time and their outputs can be scaled to the recorder.
Have a very fine box just need to do it.

Lenny I am south of Boston. Think Johns from around here also.
Regards
Paul
WB8TSL


On Sat, Mar 26, 2011 at 9:09 PM, Lenny Story <lenny at codematic.com> wrote:

> All,
>
> I think you may be right. Although i did read somewhere that this design
> was
> originally just a technical example of an ATMEL 8-bit DSP ... not sure
> though.
>
> -Lenny
>
> On Sat, Mar 26, 2011 at 8:48 PM, Hal Murray <hmurray at megapathdsl.net>
> wrote:
>
> >
> > lenny at Codematic.com said:
> > > As i stated earlier, i'm using a CMMR-60p, which seems to just be a
> small
> > > DSP.
> >
> > The data sheet at SparkFun shows that it's just an analog receiver with a
> > peak detector and AGC.
> >
> > Does anybody have any ideas on how much better you could do with an ADC
> and
> > DSP?
> >
> >
> > --
> > These are my opinions, not necessarily my employer's.  I hate spam.
> >
> >
> >
> >
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