On Jul 1, 4:34 pm, Jeff Liebermann <j...@cruzio.com> wrote:
> Tommy Tootles <t...@toot.com> hath wroth:
>
> >Jeff Liebermann wrote:
>
> >> 40KHz thru 285Khz? Great idea. Just one minor problem. A 1/4 wave
> >> antenna at about 100Khz frequency is 750 meters long. That's going to
> >> be a rather large antenna for literally dragging behind you.
> >Well, your math is correct. However, the so-called "atomic" wrist
> >watches receive their time signal from WWVB which transmits at 60kHz.
>
> Yes, but the original derranged rantings required that *AUDIO* be
> used. This was suppose to be some kind of replacement for cellular.
> None of the long wave time standards belch audio like the short wave
> WWV stations.
>
> However, these time code transmitters operate at RF frequencies as low
> as 20KHz (mostly in Russia). See:
> <http://www.npl.co.uk/time/measurement_time/time_trans.html> (2002)
>
> >How do they get that 1250 meter long antenna ( 1/4 wave at 60 kHz)
> >inside that itty bitty wrist watch case? ;-)
>
> Touche and good question. Most of the desktop variety have a ferrite
> rod loaded with lots of fine wire. I have several like this, one with
> an external rod. However, that's obviously not going to work in a
> wristwatch unit. I don't have any idea what's inside or how the
> antenna done, but I can guess(tm). Here's one way:
> <http://www.leapsecond.com/pages/atomic-bill/>
>
> The question has been asked before:
> <http://www.eham.net/forums/Elmers/148090>
> However, no real description of what's inside the wristwatch.
>
> Going to the source:
> <http://tf.nist.gov/stations/radioclocks.htm>
> NIST Recommended Practices for WWVB receivers.
> <http://tf.nist.gov/general/pdf/1976.pdf> (See section 8A)
> "We recommend that RCC products should be sensitive enough
> to successfully synchronize to signals from WWVB with a field
> strength of 50 uV/m, if the signal to noise ratio exceeds 20 dB.
> The RF bandwidth of the receiver should be narrow, typically
> ±10 Hz or less."
> and:
> "Wristwatch antennas should not be contained in the band,
> so that RCC watch bands can be replaced in the same manner
> as the bands of ordinary watches when they are damaged or
> worn out."
>
> So much for the antenna in the wrist band idea. So, the question is,
> what type of tiny antenna will work with such a field strength at
> 60KHz. I dug through the FCC ID web pile looking for an inside photo
> of Casio watch, but couldn't find anything. I'm gonna have to either
> break one open, and/or calculate the field strength of a very small
> ferrite rod antenna (later).
>
> --
> Jeff Liebermann j...@cruzio.com
> 150 Felker St #D http://www.LearnByDestroying.com
> Santa Cruz CA 95060http://802.11junk.com
> Skype: JeffLiebermann AE6KS 831-336-2558
Okay. I now extremely insterested and frustrated about how the
wristwatch can be so tiny yet receive so longwave signals.
Its probably something those FBI/CIA bastards are going to keep secret
from us.
Sick government f---scums. USA citizens should turn against the FBI/
CIA and molest the f---ing s--- out of their colons using bubbas' c--
ks.
I want to know how such a tiny device can operate at such a long
wavelength. Unfortunately, that info is classified by the FBI/CIA, and
then won't let me or any USA citizen find out about it.
I am getting so pissed off right now.
I am so interested in this wristwatch question yet I am so angry about
it because the FBI/CIA won't let me know about it.
F=== the CIA/FBI, may they be raped by big bubbas.